[1] A kilowatt-hour is unit of –
A.
Energy
B.
Power
C.
Electric charge
D.
Electric current
Ans:
Energy
Explanation :
Work is defined as a force acting through a distance (a length of space), energy is always equivalent to the ability to exert pulls or pushes against the basic forces of nature, along a path of a certain length. In the International System of Units (SI), energy is measured in joules, but in many fields other units, such as kilowatt-hours and kilocalories, are customary.
[2] Which of the following is used to split white light into different colours?
A.
Glass slab
B.
Convex lens
C.
Concave lens
D.
Prism
Ans:
Prism
Explanation :
In optics, a prism is a transparent optical element with flat, polished surfaces that refract light. At least two of the flat surfaces must have an angle between them. The exact angles between the surfaces depend on the application. The traditional geometrical shape is that of a triangular prism with a triangular base and rectangular sides, and in colloquial use "prism" usually refers to this type.
[3] Nuclear reactors used to produce electricity are based on –
A.
Nuclear fission
B.
Nuclear fusion
C.
Cold fusion
D.
Superconductivity
Ans:
Nuclear fission
Explanation :
A nuclear reactor is a device to initiate and control a sustained nuclear chain reaction. Most commonly they are used for generating electricity and for the propulsion of ships. Usually heat from nuclear fission is passed to a working fluid (water or gas), which runs through turbines that power either ship's propellers or generators.
[4] Energy that is produced commercially from coal is called –
A.
Light energy
B.
Kinetic energy
C.
Thermal energy
D.
Potential energy
Ans:
Thermal energy
Explanation :
Thermal enemy, but in most cases coal is used for electricity. The steel industry uses coal (or coke rather) in blast furnaces. Thermal energy is the part of the total internal energy of a thermodynamic system or sample of matter that results in the system temperature. This quantity may be difficult to determine or even meaningless unless the system has attained its temperature only through heating, and not been subjected to work input or output, or any other energy-changing processes.
[5] Which among the following is not a characteristic of transition metals?
A.
Tendency to gain electrons
B.
Low electro negativity
C.
Low ionization energy
D.
Malleability
Ans:
Tendency to gain electrons
Explanation :
The transition metals have a tendency to lose electrons. Since the electrons in the highest energy level are actually on a lower principal energy number than the ones before them, this makes it relatively easy to lose some or all of their electrons to land in stable state.
[6] Which one of the following is not a function of the liver?
A.
Regulation of blood sugar
B.
Enzyme activation
C.
Detoxiation
D.
Reproduction
Ans:
Reproduction
Explanation :
Liver is the body’s largest internal organ. It has many functions in the body like it helps in protein synthesis and blood clotting, manufacturing triglycerides and cholesterol, glycogen synthesis, and bile production.
[7] The source of the Sun's energy is the process of –
A.
Photoelectric emission
B.
Nuclear fission
C.
Nuclear fusion
D.
Thermionic emission
Ans:
Nuclear fusion
Explanation :
Nuclear fusion is a nuclear reaction in which two or more atomic nuclei join together, or "fuse", to form a single heavier nucleus. During this process, matter is not conserved because some of the mass of the fusing nuclei is converted to energy which is released. Fusion is the process that powers active stars.
[8] A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be -
A.
a parabola
B.
a horizontal straight line
C.
a vertical straight line
D.
a circle
Ans:
a parabola
Explanation :
Parabola, because when the coin is dropped at a particular point, it has the same velocity as the running train. So, by Newton's first law, it continues its motion horizontally with that velocity.
[9] Which of the following is a non-renewable source of energy?
A.
Biogas
B.
Solar
C.
Wind
D.
Coal
Ans:
Coal
Explanation :
A non-renewable resource is a natural resource which cannot be reproduced, grown, generated, or used on a scale which can sustain its consumption rate. So, coal is non-renewable source of energy. Once it is depleted, there is no more available for future needs. Fossil fuels (such as coal, petrol eum, and natural gas), nuclear power (uranium) and certain aquifers are examples of non-renewable resources.
[10] Solar energy is converted into chemical energy during –
A.
Transpiration
B.
Photosynthesis
C.
Diffusion
D.
Osmosis
Ans:
Photosynthesis
Explanation :
In photosynthesis, solar energy is converted to chemical energy. The chemical energy is stored in the form of glucose (sugar). Carbon dioxide, water, and sunlight are used to produce glucose, oxygen, and water. Photosynthesis is a process used by plants and other organisms to convert the light energy captured from the sun into chemical energy that can be used to fuel the organism's activities.
[11] Decibel is the unit used for –
A.
Speed of light
B.
Intensity of heat
C.
Intensity of sound
D.
Radio wave frequency
Ans:
Intensity of sound
Explanation :
The decibel (abbreviated dB) is the unit used to measure the intensity of a sound. The decibel scale is a little odd because the human ear is incredibly sensitive. Our ears can hear everything from your fingertip brushing lightly over your skin to a loud jet engine. The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities. Thedecibel is used for a wide variety of measurements in science and engineering, most prominently in acoustics, electronics, and control theory.
[12] The term ‘Isoneph' indicates the lines of equal –
A.
cloudiness
B.
salinity
C.
rainfall
D.
pressure
Ans:
cloudiness
Explanation :
An isoneph is a line indicating equal cloud cover or equal cloudiness. Variations in the degrees of slope, temperature, occurrence of rainfall, may be represented by drawing the lines of equal values on a map. All such maps are termed as Isopleth Map. The word Isopleth is derived from ‘Iso’ meaning equal and ‘pleth’ means lines. Thus, an imaginary line, which joins the places of equal values, is referred as Isopleth. The more frequently drawn isopleths include Isotherm (equal temperature), Isobar (equal pressure), Isohyets (equal rainfall), Isonephs (equal cloudiness), Isohels (equal sunshine), contours (equal heights), Isobaths (equal depths), Isohaline (equal salinity), etc.
[13] Fibre optics work on the principle of –
A.
Scattering of light
B.
Total internal absorption
C.
Total internal reflection
D.
Optical rotation
Ans:
Total internal reflection
Explanation :
An optical fiber (or optical fibre) is a flexible, transparent fiber made of glass (silica) or plastic, slightly thicker than a human hair. It functions as a waveguide, or "light pipe", to transmit light between the two ends of the fiber. The field of applied science and engineering concerned with the design and application of optical fibers is known as fiber optics.
[14] A decibel is –
A.
A musical instrument
B.
The wavelength of noise
C.
A musical note
D.
A measure of sound level
Ans:
A measure of sound level
Explanation :
The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities.
[15] The type of mirrors used in the headlamps of cars is –
A.
Parabolic concave
B.
Plane
C.
Spherical convex
D.
Cylindrical concave
Ans:
Parabolic concave
Explanation :
Curved mirror that reflects light from its inner surface, the curve being inward. It may be either circular or parabolic in section. A concave mirror converges parallel light rays inward to the point of principal focus. The image formed by a concave mirror is real (reduced and inverted) if the object is not too close to the mirror. A real image is formed at the point of convergence. If the object is close to the mirror then the image formed will be virtual, enlarged, and upright, as the rays of light cannot converge to a point. Only a parabolic concave mirror has a true, single-point principal focus for parallel rays. For this reason, parabolic mirrors are used as reflectors to focus light in telescopes, or to focus microwaves in satellite communication systems.
[16] If lift is going up with acceleration, the apparent weight of a body is -
A.
may be more or less than true weight
B.
equal to the true weight
C.
less than the true weight
D.
more than the true weight
Ans:
more than the true weight
Explanation :
If lift is going up with acceleration, the apparent weight of a body is more than the true weight.
[17] The rate of transfer of charges through a circuit is called?
A.
Potential Difference
B.
Resistance
C.
Current
D.
Energy
Ans:
Current
Explanation :
The rate of transfer of charges through a circuit is called Current. An electric current is the rate of flow of electric charge past a point or region. An electric current is said to exist when there is a net flow of electric charge through a region.
[18] The filament of electric bulb is made up of :
A.
Copper
B.
Nichrome
C.
Lead
D.
Tungsten
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[19] When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to –
A.
reflection
B.
refraction
C.
forced vibrations
D.
damped vibrations
Ans:
forced vibrations
Explanation :
The tendency of one object to force another adjoining or interconnected object into vibrational motion is referred to as a forced vibration. In the case of the guitar string mounted to the sound box, the fact that the surface area of the sound box is greater than the surface area of the string means that more surrounding air particles will be forced into vibration. This causes an increase in the amplitude and thus loudness of the sound.
[20] Mud houses are cooler in summers and warmer in winters as compared to brick houses because –
A.
mud is a good conductor
B.
mud is a bad conductor
C.
mud is a poor insulator
D.
evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
Ans:
mud is a bad conductor
Explanation :
The houses made of mud and thatched roofs are cool in summer and warm in winter as the thatched roof contains large amount of trapped air and also mud is a bad conductor of heat. In summer, the outside heat cannot enter the house and in winter, inside heat cannot flow outside.
[21] Night photography and photography in mist and fog are possible using –
A.
ultra-violet radiation
B.
infra-red radiation
C.
microwave radiation
D.
gamma radiation
Ans:
infra-red radiation
Explanation :
Infrared is used in night vision equipment when there is insufficient visible light to see. Night vision devices operate through a process involving the conversion of ambient light photons into electrons which are then amplified by a chemical and electrical process and then converted back into visible light.
[22] An Athlets runs before long jump to get advantage on –
A.
Inertia of motion
B.
Frictional force
C.
Moment of a force
D.
Principle of moments
Ans:
Inertia of motion
Explanation :
An athlete does so to build up forward momentum so that when he jumps he already has a forward motion that would be greater than that of a jump made from standing in one spot. He needs forward momentum to get a good long jump and the best way is to have a running start. In this way, he gets advantage in terms of inertia of motion which is the tendency of an object to resist a change in motion.
[23] In sunlight, a rose appears red. In green light, the same rose appears –
A.
red
B.
black
C.
green
D.
yellow
Ans:
black
Explanation :
Any object which allows light to pass through it is known as a transparent object. The colour of any transparent object is the colour of the light transmitted by it. A red rose appears red in white light because it absorbs all colours except red. However, when seen in green light, it looks black because the red colour of the rose is absorbed by the green light.
[24] The sparkling of a diamond is due to –
A.
total internal reflection of light
B.
interference of light
C.
polarization of light
D.
refraction of light
Ans:
total internal reflection of light
Explanation :
Diamonds sparkle because of the total internal reflection of light. Diamonds have a very high refractive index, meaning they slow light down much more than glass; and if cut in the right manner, the angles of incidence can be made so that light seems to get 'trapped' within the diamond giving it it's sparkly appearance.
[25] Ocean currents are an example of –
A.
convection
B.
conduction
C.
insulation
D.
radiation
Ans:
convection
Explanation :
Heat is transferred by convection in numerous examples of naturally occurring fluid flow, such as: wind, oceanic currents, and movements within the Earth's atmosphere. Winds and ocean currents are examples of convection currents. Convection serves to transfer heat from the surplus to deficit heat zones and set the oceanic circulation in motion.
Explanation :
Work is defined as a force acting through a distance (a length of space), energy is always equivalent to the ability to exert pulls or pushes against the basic forces of nature, along a path of a certain length. In the International System of Units (SI), energy is measured in joules, but in many fields other units, such as kilowatt-hours and kilocalories, are customary.
[2] Which of the following is used to split white light into different colours?
A.
Glass slab
B.
Convex lens
C.
Concave lens
D.
Prism
Ans:
Prism
Explanation :
In optics, a prism is a transparent optical element with flat, polished surfaces that refract light. At least two of the flat surfaces must have an angle between them. The exact angles between the surfaces depend on the application. The traditional geometrical shape is that of a triangular prism with a triangular base and rectangular sides, and in colloquial use "prism" usually refers to this type.
[3] Nuclear reactors used to produce electricity are based on –
A.
Nuclear fission
B.
Nuclear fusion
C.
Cold fusion
D.
Superconductivity
Ans:
Nuclear fission
Explanation :
A nuclear reactor is a device to initiate and control a sustained nuclear chain reaction. Most commonly they are used for generating electricity and for the propulsion of ships. Usually heat from nuclear fission is passed to a working fluid (water or gas), which runs through turbines that power either ship's propellers or generators.
[4] Energy that is produced commercially from coal is called –
A.
Light energy
B.
Kinetic energy
C.
Thermal energy
D.
Potential energy
Ans:
Thermal energy
Explanation :
Thermal enemy, but in most cases coal is used for electricity. The steel industry uses coal (or coke rather) in blast furnaces. Thermal energy is the part of the total internal energy of a thermodynamic system or sample of matter that results in the system temperature. This quantity may be difficult to determine or even meaningless unless the system has attained its temperature only through heating, and not been subjected to work input or output, or any other energy-changing processes.
[5] Which among the following is not a characteristic of transition metals?
A.
Tendency to gain electrons
B.
Low electro negativity
C.
Low ionization energy
D.
Malleability
Ans:
Tendency to gain electrons
Explanation :
The transition metals have a tendency to lose electrons. Since the electrons in the highest energy level are actually on a lower principal energy number than the ones before them, this makes it relatively easy to lose some or all of their electrons to land in stable state.
[6] Which one of the following is not a function of the liver?
A.
Regulation of blood sugar
B.
Enzyme activation
C.
Detoxiation
D.
Reproduction
Ans:
Reproduction
Explanation :
Liver is the body’s largest internal organ. It has many functions in the body like it helps in protein synthesis and blood clotting, manufacturing triglycerides and cholesterol, glycogen synthesis, and bile production.
[7] The source of the Sun's energy is the process of –
A.
Photoelectric emission
B.
Nuclear fission
C.
Nuclear fusion
D.
Thermionic emission
Ans:
Nuclear fusion
Explanation :
Nuclear fusion is a nuclear reaction in which two or more atomic nuclei join together, or "fuse", to form a single heavier nucleus. During this process, matter is not conserved because some of the mass of the fusing nuclei is converted to energy which is released. Fusion is the process that powers active stars.
[8] A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be -
A.
a parabola
B.
a horizontal straight line
C.
a vertical straight line
D.
a circle
Ans:
a parabola
Explanation :
Parabola, because when the coin is dropped at a particular point, it has the same velocity as the running train. So, by Newton's first law, it continues its motion horizontally with that velocity.
[9] Which of the following is a non-renewable source of energy?
A.
Biogas
B.
Solar
C.
Wind
D.
Coal
Ans:
Coal
Explanation :
A non-renewable resource is a natural resource which cannot be reproduced, grown, generated, or used on a scale which can sustain its consumption rate. So, coal is non-renewable source of energy. Once it is depleted, there is no more available for future needs. Fossil fuels (such as coal, petrol eum, and natural gas), nuclear power (uranium) and certain aquifers are examples of non-renewable resources.
[10] Solar energy is converted into chemical energy during –
A.
Transpiration
B.
Photosynthesis
C.
Diffusion
D.
Osmosis
Ans:
Photosynthesis
Explanation :
In photosynthesis, solar energy is converted to chemical energy. The chemical energy is stored in the form of glucose (sugar). Carbon dioxide, water, and sunlight are used to produce glucose, oxygen, and water. Photosynthesis is a process used by plants and other organisms to convert the light energy captured from the sun into chemical energy that can be used to fuel the organism's activities.
[11] Decibel is the unit used for –
A.
Speed of light
B.
Intensity of heat
C.
Intensity of sound
D.
Radio wave frequency
Ans:
Intensity of sound
Explanation :
The decibel (abbreviated dB) is the unit used to measure the intensity of a sound. The decibel scale is a little odd because the human ear is incredibly sensitive. Our ears can hear everything from your fingertip brushing lightly over your skin to a loud jet engine. The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities. Thedecibel is used for a wide variety of measurements in science and engineering, most prominently in acoustics, electronics, and control theory.
[12] The term ‘Isoneph' indicates the lines of equal –
A.
cloudiness
B.
salinity
C.
rainfall
D.
pressure
Ans:
cloudiness
Explanation :
An isoneph is a line indicating equal cloud cover or equal cloudiness. Variations in the degrees of slope, temperature, occurrence of rainfall, may be represented by drawing the lines of equal values on a map. All such maps are termed as Isopleth Map. The word Isopleth is derived from ‘Iso’ meaning equal and ‘pleth’ means lines. Thus, an imaginary line, which joins the places of equal values, is referred as Isopleth. The more frequently drawn isopleths include Isotherm (equal temperature), Isobar (equal pressure), Isohyets (equal rainfall), Isonephs (equal cloudiness), Isohels (equal sunshine), contours (equal heights), Isobaths (equal depths), Isohaline (equal salinity), etc.
[13] Fibre optics work on the principle of –
A.
Scattering of light
B.
Total internal absorption
C.
Total internal reflection
D.
Optical rotation
Ans:
Total internal reflection
Explanation :
An optical fiber (or optical fibre) is a flexible, transparent fiber made of glass (silica) or plastic, slightly thicker than a human hair. It functions as a waveguide, or "light pipe", to transmit light between the two ends of the fiber. The field of applied science and engineering concerned with the design and application of optical fibers is known as fiber optics.
[14] A decibel is –
A.
A musical instrument
B.
The wavelength of noise
C.
A musical note
D.
A measure of sound level
Ans:
A measure of sound level
Explanation :
The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities.
[15] The type of mirrors used in the headlamps of cars is –
A.
Parabolic concave
B.
Plane
C.
Spherical convex
D.
Cylindrical concave
Ans:
Parabolic concave
Explanation :
Curved mirror that reflects light from its inner surface, the curve being inward. It may be either circular or parabolic in section. A concave mirror converges parallel light rays inward to the point of principal focus. The image formed by a concave mirror is real (reduced and inverted) if the object is not too close to the mirror. A real image is formed at the point of convergence. If the object is close to the mirror then the image formed will be virtual, enlarged, and upright, as the rays of light cannot converge to a point. Only a parabolic concave mirror has a true, single-point principal focus for parallel rays. For this reason, parabolic mirrors are used as reflectors to focus light in telescopes, or to focus microwaves in satellite communication systems.
[16] If lift is going up with acceleration, the apparent weight of a body is -
A.
may be more or less than true weight
B.
equal to the true weight
C.
less than the true weight
D.
more than the true weight
Ans:
more than the true weight
Explanation :
If lift is going up with acceleration, the apparent weight of a body is more than the true weight.
[17] The rate of transfer of charges through a circuit is called?
A.
Potential Difference
B.
Resistance
C.
Current
D.
Energy
Ans:
Current
Explanation :
The rate of transfer of charges through a circuit is called Current. An electric current is the rate of flow of electric charge past a point or region. An electric current is said to exist when there is a net flow of electric charge through a region.
[18] The filament of electric bulb is made up of :
A.
Copper
B.
Nichrome
C.
Lead
D.
Tungsten
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[19] When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to –
A.
reflection
B.
refraction
C.
forced vibrations
D.
damped vibrations
Ans:
forced vibrations
Explanation :
The tendency of one object to force another adjoining or interconnected object into vibrational motion is referred to as a forced vibration. In the case of the guitar string mounted to the sound box, the fact that the surface area of the sound box is greater than the surface area of the string means that more surrounding air particles will be forced into vibration. This causes an increase in the amplitude and thus loudness of the sound.
[20] Mud houses are cooler in summers and warmer in winters as compared to brick houses because –
A.
mud is a good conductor
B.
mud is a bad conductor
C.
mud is a poor insulator
D.
evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
Ans:
mud is a bad conductor
Explanation :
The houses made of mud and thatched roofs are cool in summer and warm in winter as the thatched roof contains large amount of trapped air and also mud is a bad conductor of heat. In summer, the outside heat cannot enter the house and in winter, inside heat cannot flow outside.
[21] Night photography and photography in mist and fog are possible using –
A.
ultra-violet radiation
B.
infra-red radiation
C.
microwave radiation
D.
gamma radiation
Ans:
infra-red radiation
Explanation :
Infrared is used in night vision equipment when there is insufficient visible light to see. Night vision devices operate through a process involving the conversion of ambient light photons into electrons which are then amplified by a chemical and electrical process and then converted back into visible light.
[22] An Athlets runs before long jump to get advantage on –
A.
Inertia of motion
B.
Frictional force
C.
Moment of a force
D.
Principle of moments
Ans:
Inertia of motion
Explanation :
An athlete does so to build up forward momentum so that when he jumps he already has a forward motion that would be greater than that of a jump made from standing in one spot. He needs forward momentum to get a good long jump and the best way is to have a running start. In this way, he gets advantage in terms of inertia of motion which is the tendency of an object to resist a change in motion.
[23] In sunlight, a rose appears red. In green light, the same rose appears –
A.
red
B.
black
C.
green
D.
yellow
Ans:
black
Explanation :
Any object which allows light to pass through it is known as a transparent object. The colour of any transparent object is the colour of the light transmitted by it. A red rose appears red in white light because it absorbs all colours except red. However, when seen in green light, it looks black because the red colour of the rose is absorbed by the green light.
[24] The sparkling of a diamond is due to –
A.
total internal reflection of light
B.
interference of light
C.
polarization of light
D.
refraction of light
Ans:
total internal reflection of light
Explanation :
Diamonds sparkle because of the total internal reflection of light. Diamonds have a very high refractive index, meaning they slow light down much more than glass; and if cut in the right manner, the angles of incidence can be made so that light seems to get 'trapped' within the diamond giving it it's sparkly appearance.
[25] Ocean currents are an example of –
A.
convection
B.
conduction
C.
insulation
D.
radiation
Ans:
convection
Explanation :
Heat is transferred by convection in numerous examples of naturally occurring fluid flow, such as: wind, oceanic currents, and movements within the Earth's atmosphere. Winds and ocean currents are examples of convection currents. Convection serves to transfer heat from the surplus to deficit heat zones and set the oceanic circulation in motion.
Explanation :
A nuclear reactor is a device to initiate and control a sustained nuclear chain reaction. Most commonly they are used for generating electricity and for the propulsion of ships. Usually heat from nuclear fission is passed to a working fluid (water or gas), which runs through turbines that power either ship's propellers or generators.
[4] Energy that is produced commercially from coal is called –
A.
Light energy
B.
Kinetic energy
C.
Thermal energy
D.
Potential energy
Ans:
Thermal energy
Explanation :
Thermal enemy, but in most cases coal is used for electricity. The steel industry uses coal (or coke rather) in blast furnaces. Thermal energy is the part of the total internal energy of a thermodynamic system or sample of matter that results in the system temperature. This quantity may be difficult to determine or even meaningless unless the system has attained its temperature only through heating, and not been subjected to work input or output, or any other energy-changing processes.
[5] Which among the following is not a characteristic of transition metals?
A.
Tendency to gain electrons
B.
Low electro negativity
C.
Low ionization energy
D.
Malleability
Ans:
Tendency to gain electrons
Explanation :
The transition metals have a tendency to lose electrons. Since the electrons in the highest energy level are actually on a lower principal energy number than the ones before them, this makes it relatively easy to lose some or all of their electrons to land in stable state.
[6] Which one of the following is not a function of the liver?
A.
Regulation of blood sugar
B.
Enzyme activation
C.
Detoxiation
D.
Reproduction
Ans:
Reproduction
Explanation :
Liver is the body’s largest internal organ. It has many functions in the body like it helps in protein synthesis and blood clotting, manufacturing triglycerides and cholesterol, glycogen synthesis, and bile production.
[7] The source of the Sun's energy is the process of –
A.
Photoelectric emission
B.
Nuclear fission
C.
Nuclear fusion
D.
Thermionic emission
Ans:
Nuclear fusion
Explanation :
Nuclear fusion is a nuclear reaction in which two or more atomic nuclei join together, or "fuse", to form a single heavier nucleus. During this process, matter is not conserved because some of the mass of the fusing nuclei is converted to energy which is released. Fusion is the process that powers active stars.
[8] A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be -
A.
a parabola
B.
a horizontal straight line
C.
a vertical straight line
D.
a circle
Ans:
a parabola
Explanation :
Parabola, because when the coin is dropped at a particular point, it has the same velocity as the running train. So, by Newton's first law, it continues its motion horizontally with that velocity.
[9] Which of the following is a non-renewable source of energy?
A.
Biogas
B.
Solar
C.
Wind
D.
Coal
Ans:
Coal
Explanation :
A non-renewable resource is a natural resource which cannot be reproduced, grown, generated, or used on a scale which can sustain its consumption rate. So, coal is non-renewable source of energy. Once it is depleted, there is no more available for future needs. Fossil fuels (such as coal, petrol eum, and natural gas), nuclear power (uranium) and certain aquifers are examples of non-renewable resources.
[10] Solar energy is converted into chemical energy during –
A.
Transpiration
B.
Photosynthesis
C.
Diffusion
D.
Osmosis
Ans:
Photosynthesis
Explanation :
In photosynthesis, solar energy is converted to chemical energy. The chemical energy is stored in the form of glucose (sugar). Carbon dioxide, water, and sunlight are used to produce glucose, oxygen, and water. Photosynthesis is a process used by plants and other organisms to convert the light energy captured from the sun into chemical energy that can be used to fuel the organism's activities.
[11] Decibel is the unit used for –
A.
Speed of light
B.
Intensity of heat
C.
Intensity of sound
D.
Radio wave frequency
Ans:
Intensity of sound
Explanation :
The decibel (abbreviated dB) is the unit used to measure the intensity of a sound. The decibel scale is a little odd because the human ear is incredibly sensitive. Our ears can hear everything from your fingertip brushing lightly over your skin to a loud jet engine. The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities. Thedecibel is used for a wide variety of measurements in science and engineering, most prominently in acoustics, electronics, and control theory.
[12] The term ‘Isoneph' indicates the lines of equal –
A.
cloudiness
B.
salinity
C.
rainfall
D.
pressure
Ans:
cloudiness
Explanation :
An isoneph is a line indicating equal cloud cover or equal cloudiness. Variations in the degrees of slope, temperature, occurrence of rainfall, may be represented by drawing the lines of equal values on a map. All such maps are termed as Isopleth Map. The word Isopleth is derived from ‘Iso’ meaning equal and ‘pleth’ means lines. Thus, an imaginary line, which joins the places of equal values, is referred as Isopleth. The more frequently drawn isopleths include Isotherm (equal temperature), Isobar (equal pressure), Isohyets (equal rainfall), Isonephs (equal cloudiness), Isohels (equal sunshine), contours (equal heights), Isobaths (equal depths), Isohaline (equal salinity), etc.
[13] Fibre optics work on the principle of –
A.
Scattering of light
B.
Total internal absorption
C.
Total internal reflection
D.
Optical rotation
Ans:
Total internal reflection
Explanation :
An optical fiber (or optical fibre) is a flexible, transparent fiber made of glass (silica) or plastic, slightly thicker than a human hair. It functions as a waveguide, or "light pipe", to transmit light between the two ends of the fiber. The field of applied science and engineering concerned with the design and application of optical fibers is known as fiber optics.
[14] A decibel is –
A.
A musical instrument
B.
The wavelength of noise
C.
A musical note
D.
A measure of sound level
Ans:
A measure of sound level
Explanation :
The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities.
[15] The type of mirrors used in the headlamps of cars is –
A.
Parabolic concave
B.
Plane
C.
Spherical convex
D.
Cylindrical concave
Ans:
Parabolic concave
Explanation :
Curved mirror that reflects light from its inner surface, the curve being inward. It may be either circular or parabolic in section. A concave mirror converges parallel light rays inward to the point of principal focus. The image formed by a concave mirror is real (reduced and inverted) if the object is not too close to the mirror. A real image is formed at the point of convergence. If the object is close to the mirror then the image formed will be virtual, enlarged, and upright, as the rays of light cannot converge to a point. Only a parabolic concave mirror has a true, single-point principal focus for parallel rays. For this reason, parabolic mirrors are used as reflectors to focus light in telescopes, or to focus microwaves in satellite communication systems.
[16] If lift is going up with acceleration, the apparent weight of a body is -
A.
may be more or less than true weight
B.
equal to the true weight
C.
less than the true weight
D.
more than the true weight
Ans:
more than the true weight
Explanation :
If lift is going up with acceleration, the apparent weight of a body is more than the true weight.
[17] The rate of transfer of charges through a circuit is called?
A.
Potential Difference
B.
Resistance
C.
Current
D.
Energy
Ans:
Current
Explanation :
The rate of transfer of charges through a circuit is called Current. An electric current is the rate of flow of electric charge past a point or region. An electric current is said to exist when there is a net flow of electric charge through a region.
[18] The filament of electric bulb is made up of :
A.
Copper
B.
Nichrome
C.
Lead
D.
Tungsten
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[19] When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to –
A.
reflection
B.
refraction
C.
forced vibrations
D.
damped vibrations
Ans:
forced vibrations
Explanation :
The tendency of one object to force another adjoining or interconnected object into vibrational motion is referred to as a forced vibration. In the case of the guitar string mounted to the sound box, the fact that the surface area of the sound box is greater than the surface area of the string means that more surrounding air particles will be forced into vibration. This causes an increase in the amplitude and thus loudness of the sound.
[20] Mud houses are cooler in summers and warmer in winters as compared to brick houses because –
A.
mud is a good conductor
B.
mud is a bad conductor
C.
mud is a poor insulator
D.
evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
Ans:
mud is a bad conductor
Explanation :
The houses made of mud and thatched roofs are cool in summer and warm in winter as the thatched roof contains large amount of trapped air and also mud is a bad conductor of heat. In summer, the outside heat cannot enter the house and in winter, inside heat cannot flow outside.
[21] Night photography and photography in mist and fog are possible using –
A.
ultra-violet radiation
B.
infra-red radiation
C.
microwave radiation
D.
gamma radiation
Ans:
infra-red radiation
Explanation :
Infrared is used in night vision equipment when there is insufficient visible light to see. Night vision devices operate through a process involving the conversion of ambient light photons into electrons which are then amplified by a chemical and electrical process and then converted back into visible light.
[22] An Athlets runs before long jump to get advantage on –
A.
Inertia of motion
B.
Frictional force
C.
Moment of a force
D.
Principle of moments
Ans:
Inertia of motion
Explanation :
An athlete does so to build up forward momentum so that when he jumps he already has a forward motion that would be greater than that of a jump made from standing in one spot. He needs forward momentum to get a good long jump and the best way is to have a running start. In this way, he gets advantage in terms of inertia of motion which is the tendency of an object to resist a change in motion.
[23] In sunlight, a rose appears red. In green light, the same rose appears –
A.
red
B.
black
C.
green
D.
yellow
Ans:
black
Explanation :
Any object which allows light to pass through it is known as a transparent object. The colour of any transparent object is the colour of the light transmitted by it. A red rose appears red in white light because it absorbs all colours except red. However, when seen in green light, it looks black because the red colour of the rose is absorbed by the green light.
[24] The sparkling of a diamond is due to –
A.
total internal reflection of light
B.
interference of light
C.
polarization of light
D.
refraction of light
Ans:
total internal reflection of light
Explanation :
Diamonds sparkle because of the total internal reflection of light. Diamonds have a very high refractive index, meaning they slow light down much more than glass; and if cut in the right manner, the angles of incidence can be made so that light seems to get 'trapped' within the diamond giving it it's sparkly appearance.
[25] Ocean currents are an example of –
A.
convection
B.
conduction
C.
insulation
D.
radiation
Ans:
convection
Explanation :
Heat is transferred by convection in numerous examples of naturally occurring fluid flow, such as: wind, oceanic currents, and movements within the Earth's atmosphere. Winds and ocean currents are examples of convection currents. Convection serves to transfer heat from the surplus to deficit heat zones and set the oceanic circulation in motion.
Explanation :
The transition metals have a tendency to lose electrons. Since the electrons in the highest energy level are actually on a lower principal energy number than the ones before them, this makes it relatively easy to lose some or all of their electrons to land in stable state.
[6] Which one of the following is not a function of the liver?
A.
Regulation of blood sugar
B.
Enzyme activation
C.
Detoxiation
D.
Reproduction
Ans:
Reproduction
Explanation :
Liver is the body’s largest internal organ. It has many functions in the body like it helps in protein synthesis and blood clotting, manufacturing triglycerides and cholesterol, glycogen synthesis, and bile production.
[7] The source of the Sun's energy is the process of –
A.
Photoelectric emission
B.
Nuclear fission
C.
Nuclear fusion
D.
Thermionic emission
Ans:
Nuclear fusion
Explanation :
Nuclear fusion is a nuclear reaction in which two or more atomic nuclei join together, or "fuse", to form a single heavier nucleus. During this process, matter is not conserved because some of the mass of the fusing nuclei is converted to energy which is released. Fusion is the process that powers active stars.
[8] A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be -
A.
a parabola
B.
a horizontal straight line
C.
a vertical straight line
D.
a circle
Ans:
a parabola
Explanation :
Parabola, because when the coin is dropped at a particular point, it has the same velocity as the running train. So, by Newton's first law, it continues its motion horizontally with that velocity.
[9] Which of the following is a non-renewable source of energy?
A.
Biogas
B.
Solar
C.
Wind
D.
Coal
Ans:
Coal
Explanation :
A non-renewable resource is a natural resource which cannot be reproduced, grown, generated, or used on a scale which can sustain its consumption rate. So, coal is non-renewable source of energy. Once it is depleted, there is no more available for future needs. Fossil fuels (such as coal, petrol eum, and natural gas), nuclear power (uranium) and certain aquifers are examples of non-renewable resources.
[10] Solar energy is converted into chemical energy during –
A.
Transpiration
B.
Photosynthesis
C.
Diffusion
D.
Osmosis
Ans:
Photosynthesis
Explanation :
In photosynthesis, solar energy is converted to chemical energy. The chemical energy is stored in the form of glucose (sugar). Carbon dioxide, water, and sunlight are used to produce glucose, oxygen, and water. Photosynthesis is a process used by plants and other organisms to convert the light energy captured from the sun into chemical energy that can be used to fuel the organism's activities.
[11] Decibel is the unit used for –
A.
Speed of light
B.
Intensity of heat
C.
Intensity of sound
D.
Radio wave frequency
Ans:
Intensity of sound
Explanation :
The decibel (abbreviated dB) is the unit used to measure the intensity of a sound. The decibel scale is a little odd because the human ear is incredibly sensitive. Our ears can hear everything from your fingertip brushing lightly over your skin to a loud jet engine. The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities. Thedecibel is used for a wide variety of measurements in science and engineering, most prominently in acoustics, electronics, and control theory.
[12] The term ‘Isoneph' indicates the lines of equal –
A.
cloudiness
B.
salinity
C.
rainfall
D.
pressure
Ans:
cloudiness
Explanation :
An isoneph is a line indicating equal cloud cover or equal cloudiness. Variations in the degrees of slope, temperature, occurrence of rainfall, may be represented by drawing the lines of equal values on a map. All such maps are termed as Isopleth Map. The word Isopleth is derived from ‘Iso’ meaning equal and ‘pleth’ means lines. Thus, an imaginary line, which joins the places of equal values, is referred as Isopleth. The more frequently drawn isopleths include Isotherm (equal temperature), Isobar (equal pressure), Isohyets (equal rainfall), Isonephs (equal cloudiness), Isohels (equal sunshine), contours (equal heights), Isobaths (equal depths), Isohaline (equal salinity), etc.
[13] Fibre optics work on the principle of –
A.
Scattering of light
B.
Total internal absorption
C.
Total internal reflection
D.
Optical rotation
Ans:
Total internal reflection
Explanation :
An optical fiber (or optical fibre) is a flexible, transparent fiber made of glass (silica) or plastic, slightly thicker than a human hair. It functions as a waveguide, or "light pipe", to transmit light between the two ends of the fiber. The field of applied science and engineering concerned with the design and application of optical fibers is known as fiber optics.
[14] A decibel is –
A.
A musical instrument
B.
The wavelength of noise
C.
A musical note
D.
A measure of sound level
Ans:
A measure of sound level
Explanation :
The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities.
[15] The type of mirrors used in the headlamps of cars is –
A.
Parabolic concave
B.
Plane
C.
Spherical convex
D.
Cylindrical concave
Ans:
Parabolic concave
Explanation :
Curved mirror that reflects light from its inner surface, the curve being inward. It may be either circular or parabolic in section. A concave mirror converges parallel light rays inward to the point of principal focus. The image formed by a concave mirror is real (reduced and inverted) if the object is not too close to the mirror. A real image is formed at the point of convergence. If the object is close to the mirror then the image formed will be virtual, enlarged, and upright, as the rays of light cannot converge to a point. Only a parabolic concave mirror has a true, single-point principal focus for parallel rays. For this reason, parabolic mirrors are used as reflectors to focus light in telescopes, or to focus microwaves in satellite communication systems.
[16] If lift is going up with acceleration, the apparent weight of a body is -
A.
may be more or less than true weight
B.
equal to the true weight
C.
less than the true weight
D.
more than the true weight
Ans:
more than the true weight
Explanation :
If lift is going up with acceleration, the apparent weight of a body is more than the true weight.
[17] The rate of transfer of charges through a circuit is called?
A.
Potential Difference
B.
Resistance
C.
Current
D.
Energy
Ans:
Current
Explanation :
The rate of transfer of charges through a circuit is called Current. An electric current is the rate of flow of electric charge past a point or region. An electric current is said to exist when there is a net flow of electric charge through a region.
[18] The filament of electric bulb is made up of :
A.
Copper
B.
Nichrome
C.
Lead
D.
Tungsten
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[19] When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to –
A.
reflection
B.
refraction
C.
forced vibrations
D.
damped vibrations
Ans:
forced vibrations
Explanation :
The tendency of one object to force another adjoining or interconnected object into vibrational motion is referred to as a forced vibration. In the case of the guitar string mounted to the sound box, the fact that the surface area of the sound box is greater than the surface area of the string means that more surrounding air particles will be forced into vibration. This causes an increase in the amplitude and thus loudness of the sound.
[20] Mud houses are cooler in summers and warmer in winters as compared to brick houses because –
A.
mud is a good conductor
B.
mud is a bad conductor
C.
mud is a poor insulator
D.
evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
Ans:
mud is a bad conductor
Explanation :
The houses made of mud and thatched roofs are cool in summer and warm in winter as the thatched roof contains large amount of trapped air and also mud is a bad conductor of heat. In summer, the outside heat cannot enter the house and in winter, inside heat cannot flow outside.
[21] Night photography and photography in mist and fog are possible using –
A.
ultra-violet radiation
B.
infra-red radiation
C.
microwave radiation
D.
gamma radiation
Ans:
infra-red radiation
Explanation :
Infrared is used in night vision equipment when there is insufficient visible light to see. Night vision devices operate through a process involving the conversion of ambient light photons into electrons which are then amplified by a chemical and electrical process and then converted back into visible light.
[22] An Athlets runs before long jump to get advantage on –
A.
Inertia of motion
B.
Frictional force
C.
Moment of a force
D.
Principle of moments
Ans:
Inertia of motion
Explanation :
An athlete does so to build up forward momentum so that when he jumps he already has a forward motion that would be greater than that of a jump made from standing in one spot. He needs forward momentum to get a good long jump and the best way is to have a running start. In this way, he gets advantage in terms of inertia of motion which is the tendency of an object to resist a change in motion.
[23] In sunlight, a rose appears red. In green light, the same rose appears –
A.
red
B.
black
C.
green
D.
yellow
Ans:
black
Explanation :
Any object which allows light to pass through it is known as a transparent object. The colour of any transparent object is the colour of the light transmitted by it. A red rose appears red in white light because it absorbs all colours except red. However, when seen in green light, it looks black because the red colour of the rose is absorbed by the green light.
[24] The sparkling of a diamond is due to –
A.
total internal reflection of light
B.
interference of light
C.
polarization of light
D.
refraction of light
Ans:
total internal reflection of light
Explanation :
Diamonds sparkle because of the total internal reflection of light. Diamonds have a very high refractive index, meaning they slow light down much more than glass; and if cut in the right manner, the angles of incidence can be made so that light seems to get 'trapped' within the diamond giving it it's sparkly appearance.
[25] Ocean currents are an example of –
A.
convection
B.
conduction
C.
insulation
D.
radiation
Ans:
convection
Explanation :
Heat is transferred by convection in numerous examples of naturally occurring fluid flow, such as: wind, oceanic currents, and movements within the Earth's atmosphere. Winds and ocean currents are examples of convection currents. Convection serves to transfer heat from the surplus to deficit heat zones and set the oceanic circulation in motion.
Explanation :
Nuclear fusion is a nuclear reaction in which two or more atomic nuclei join together, or "fuse", to form a single heavier nucleus. During this process, matter is not conserved because some of the mass of the fusing nuclei is converted to energy which is released. Fusion is the process that powers active stars.
[8] A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be -
A.
a parabola
B.
a horizontal straight line
C.
a vertical straight line
D.
a circle
Ans:
a parabola
Explanation :
Parabola, because when the coin is dropped at a particular point, it has the same velocity as the running train. So, by Newton's first law, it continues its motion horizontally with that velocity.
[9] Which of the following is a non-renewable source of energy?
A.
Biogas
B.
Solar
C.
Wind
D.
Coal
Ans:
Coal
Explanation :
A non-renewable resource is a natural resource which cannot be reproduced, grown, generated, or used on a scale which can sustain its consumption rate. So, coal is non-renewable source of energy. Once it is depleted, there is no more available for future needs. Fossil fuels (such as coal, petrol eum, and natural gas), nuclear power (uranium) and certain aquifers are examples of non-renewable resources.
[10] Solar energy is converted into chemical energy during –
A.
Transpiration
B.
Photosynthesis
C.
Diffusion
D.
Osmosis
Ans:
Photosynthesis
Explanation :
In photosynthesis, solar energy is converted to chemical energy. The chemical energy is stored in the form of glucose (sugar). Carbon dioxide, water, and sunlight are used to produce glucose, oxygen, and water. Photosynthesis is a process used by plants and other organisms to convert the light energy captured from the sun into chemical energy that can be used to fuel the organism's activities.
[11] Decibel is the unit used for –
A.
Speed of light
B.
Intensity of heat
C.
Intensity of sound
D.
Radio wave frequency
Ans:
Intensity of sound
Explanation :
The decibel (abbreviated dB) is the unit used to measure the intensity of a sound. The decibel scale is a little odd because the human ear is incredibly sensitive. Our ears can hear everything from your fingertip brushing lightly over your skin to a loud jet engine. The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities. Thedecibel is used for a wide variety of measurements in science and engineering, most prominently in acoustics, electronics, and control theory.
[12] The term ‘Isoneph' indicates the lines of equal –
A.
cloudiness
B.
salinity
C.
rainfall
D.
pressure
Ans:
cloudiness
Explanation :
An isoneph is a line indicating equal cloud cover or equal cloudiness. Variations in the degrees of slope, temperature, occurrence of rainfall, may be represented by drawing the lines of equal values on a map. All such maps are termed as Isopleth Map. The word Isopleth is derived from ‘Iso’ meaning equal and ‘pleth’ means lines. Thus, an imaginary line, which joins the places of equal values, is referred as Isopleth. The more frequently drawn isopleths include Isotherm (equal temperature), Isobar (equal pressure), Isohyets (equal rainfall), Isonephs (equal cloudiness), Isohels (equal sunshine), contours (equal heights), Isobaths (equal depths), Isohaline (equal salinity), etc.
[13] Fibre optics work on the principle of –
A.
Scattering of light
B.
Total internal absorption
C.
Total internal reflection
D.
Optical rotation
Ans:
Total internal reflection
Explanation :
An optical fiber (or optical fibre) is a flexible, transparent fiber made of glass (silica) or plastic, slightly thicker than a human hair. It functions as a waveguide, or "light pipe", to transmit light between the two ends of the fiber. The field of applied science and engineering concerned with the design and application of optical fibers is known as fiber optics.
[14] A decibel is –
A.
A musical instrument
B.
The wavelength of noise
C.
A musical note
D.
A measure of sound level
Ans:
A measure of sound level
Explanation :
The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities.
[15] The type of mirrors used in the headlamps of cars is –
A.
Parabolic concave
B.
Plane
C.
Spherical convex
D.
Cylindrical concave
Ans:
Parabolic concave
Explanation :
Curved mirror that reflects light from its inner surface, the curve being inward. It may be either circular or parabolic in section. A concave mirror converges parallel light rays inward to the point of principal focus. The image formed by a concave mirror is real (reduced and inverted) if the object is not too close to the mirror. A real image is formed at the point of convergence. If the object is close to the mirror then the image formed will be virtual, enlarged, and upright, as the rays of light cannot converge to a point. Only a parabolic concave mirror has a true, single-point principal focus for parallel rays. For this reason, parabolic mirrors are used as reflectors to focus light in telescopes, or to focus microwaves in satellite communication systems.
[16] If lift is going up with acceleration, the apparent weight of a body is -
A.
may be more or less than true weight
B.
equal to the true weight
C.
less than the true weight
D.
more than the true weight
Ans:
more than the true weight
Explanation :
If lift is going up with acceleration, the apparent weight of a body is more than the true weight.
[17] The rate of transfer of charges through a circuit is called?
A.
Potential Difference
B.
Resistance
C.
Current
D.
Energy
Ans:
Current
Explanation :
The rate of transfer of charges through a circuit is called Current. An electric current is the rate of flow of electric charge past a point or region. An electric current is said to exist when there is a net flow of electric charge through a region.
[18] The filament of electric bulb is made up of :
A.
Copper
B.
Nichrome
C.
Lead
D.
Tungsten
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[19] When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to –
A.
reflection
B.
refraction
C.
forced vibrations
D.
damped vibrations
Ans:
forced vibrations
Explanation :
The tendency of one object to force another adjoining or interconnected object into vibrational motion is referred to as a forced vibration. In the case of the guitar string mounted to the sound box, the fact that the surface area of the sound box is greater than the surface area of the string means that more surrounding air particles will be forced into vibration. This causes an increase in the amplitude and thus loudness of the sound.
[20] Mud houses are cooler in summers and warmer in winters as compared to brick houses because –
A.
mud is a good conductor
B.
mud is a bad conductor
C.
mud is a poor insulator
D.
evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
Ans:
mud is a bad conductor
Explanation :
The houses made of mud and thatched roofs are cool in summer and warm in winter as the thatched roof contains large amount of trapped air and also mud is a bad conductor of heat. In summer, the outside heat cannot enter the house and in winter, inside heat cannot flow outside.
[21] Night photography and photography in mist and fog are possible using –
A.
ultra-violet radiation
B.
infra-red radiation
C.
microwave radiation
D.
gamma radiation
Ans:
infra-red radiation
Explanation :
Infrared is used in night vision equipment when there is insufficient visible light to see. Night vision devices operate through a process involving the conversion of ambient light photons into electrons which are then amplified by a chemical and electrical process and then converted back into visible light.
[22] An Athlets runs before long jump to get advantage on –
A.
Inertia of motion
B.
Frictional force
C.
Moment of a force
D.
Principle of moments
Ans:
Inertia of motion
Explanation :
An athlete does so to build up forward momentum so that when he jumps he already has a forward motion that would be greater than that of a jump made from standing in one spot. He needs forward momentum to get a good long jump and the best way is to have a running start. In this way, he gets advantage in terms of inertia of motion which is the tendency of an object to resist a change in motion.
[23] In sunlight, a rose appears red. In green light, the same rose appears –
A.
red
B.
black
C.
green
D.
yellow
Ans:
black
Explanation :
Any object which allows light to pass through it is known as a transparent object. The colour of any transparent object is the colour of the light transmitted by it. A red rose appears red in white light because it absorbs all colours except red. However, when seen in green light, it looks black because the red colour of the rose is absorbed by the green light.
[24] The sparkling of a diamond is due to –
A.
total internal reflection of light
B.
interference of light
C.
polarization of light
D.
refraction of light
Ans:
total internal reflection of light
Explanation :
Diamonds sparkle because of the total internal reflection of light. Diamonds have a very high refractive index, meaning they slow light down much more than glass; and if cut in the right manner, the angles of incidence can be made so that light seems to get 'trapped' within the diamond giving it it's sparkly appearance.
[25] Ocean currents are an example of –
A.
convection
B.
conduction
C.
insulation
D.
radiation
Ans:
convection
Explanation :
Heat is transferred by convection in numerous examples of naturally occurring fluid flow, such as: wind, oceanic currents, and movements within the Earth's atmosphere. Winds and ocean currents are examples of convection currents. Convection serves to transfer heat from the surplus to deficit heat zones and set the oceanic circulation in motion.
Explanation :
A non-renewable resource is a natural resource which cannot be reproduced, grown, generated, or used on a scale which can sustain its consumption rate. So, coal is non-renewable source of energy. Once it is depleted, there is no more available for future needs. Fossil fuels (such as coal, petrol eum, and natural gas), nuclear power (uranium) and certain aquifers are examples of non-renewable resources.
[10] Solar energy is converted into chemical energy during –
A.
Transpiration
B.
Photosynthesis
C.
Diffusion
D.
Osmosis
Ans:
Photosynthesis
Explanation :
In photosynthesis, solar energy is converted to chemical energy. The chemical energy is stored in the form of glucose (sugar). Carbon dioxide, water, and sunlight are used to produce glucose, oxygen, and water. Photosynthesis is a process used by plants and other organisms to convert the light energy captured from the sun into chemical energy that can be used to fuel the organism's activities.
[11] Decibel is the unit used for –
A.
Speed of light
B.
Intensity of heat
C.
Intensity of sound
D.
Radio wave frequency
Ans:
Intensity of sound
Explanation :
The decibel (abbreviated dB) is the unit used to measure the intensity of a sound. The decibel scale is a little odd because the human ear is incredibly sensitive. Our ears can hear everything from your fingertip brushing lightly over your skin to a loud jet engine. The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities. Thedecibel is used for a wide variety of measurements in science and engineering, most prominently in acoustics, electronics, and control theory.
[12] The term ‘Isoneph' indicates the lines of equal –
A.
cloudiness
B.
salinity
C.
rainfall
D.
pressure
Ans:
cloudiness
Explanation :
An isoneph is a line indicating equal cloud cover or equal cloudiness. Variations in the degrees of slope, temperature, occurrence of rainfall, may be represented by drawing the lines of equal values on a map. All such maps are termed as Isopleth Map. The word Isopleth is derived from ‘Iso’ meaning equal and ‘pleth’ means lines. Thus, an imaginary line, which joins the places of equal values, is referred as Isopleth. The more frequently drawn isopleths include Isotherm (equal temperature), Isobar (equal pressure), Isohyets (equal rainfall), Isonephs (equal cloudiness), Isohels (equal sunshine), contours (equal heights), Isobaths (equal depths), Isohaline (equal salinity), etc.
[13] Fibre optics work on the principle of –
A.
Scattering of light
B.
Total internal absorption
C.
Total internal reflection
D.
Optical rotation
Ans:
Total internal reflection
Explanation :
An optical fiber (or optical fibre) is a flexible, transparent fiber made of glass (silica) or plastic, slightly thicker than a human hair. It functions as a waveguide, or "light pipe", to transmit light between the two ends of the fiber. The field of applied science and engineering concerned with the design and application of optical fibers is known as fiber optics.
[14] A decibel is –
A.
A musical instrument
B.
The wavelength of noise
C.
A musical note
D.
A measure of sound level
Ans:
A measure of sound level
Explanation :
The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities.
[15] The type of mirrors used in the headlamps of cars is –
A.
Parabolic concave
B.
Plane
C.
Spherical convex
D.
Cylindrical concave
Ans:
Parabolic concave
Explanation :
Curved mirror that reflects light from its inner surface, the curve being inward. It may be either circular or parabolic in section. A concave mirror converges parallel light rays inward to the point of principal focus. The image formed by a concave mirror is real (reduced and inverted) if the object is not too close to the mirror. A real image is formed at the point of convergence. If the object is close to the mirror then the image formed will be virtual, enlarged, and upright, as the rays of light cannot converge to a point. Only a parabolic concave mirror has a true, single-point principal focus for parallel rays. For this reason, parabolic mirrors are used as reflectors to focus light in telescopes, or to focus microwaves in satellite communication systems.
[16] If lift is going up with acceleration, the apparent weight of a body is -
A.
may be more or less than true weight
B.
equal to the true weight
C.
less than the true weight
D.
more than the true weight
Ans:
more than the true weight
Explanation :
If lift is going up with acceleration, the apparent weight of a body is more than the true weight.
[17] The rate of transfer of charges through a circuit is called?
A.
Potential Difference
B.
Resistance
C.
Current
D.
Energy
Ans:
Current
Explanation :
The rate of transfer of charges through a circuit is called Current. An electric current is the rate of flow of electric charge past a point or region. An electric current is said to exist when there is a net flow of electric charge through a region.
[18] The filament of electric bulb is made up of :
A.
Copper
B.
Nichrome
C.
Lead
D.
Tungsten
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[19] When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to –
A.
reflection
B.
refraction
C.
forced vibrations
D.
damped vibrations
Ans:
forced vibrations
Explanation :
The tendency of one object to force another adjoining or interconnected object into vibrational motion is referred to as a forced vibration. In the case of the guitar string mounted to the sound box, the fact that the surface area of the sound box is greater than the surface area of the string means that more surrounding air particles will be forced into vibration. This causes an increase in the amplitude and thus loudness of the sound.
[20] Mud houses are cooler in summers and warmer in winters as compared to brick houses because –
A.
mud is a good conductor
B.
mud is a bad conductor
C.
mud is a poor insulator
D.
evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
Ans:
mud is a bad conductor
Explanation :
The houses made of mud and thatched roofs are cool in summer and warm in winter as the thatched roof contains large amount of trapped air and also mud is a bad conductor of heat. In summer, the outside heat cannot enter the house and in winter, inside heat cannot flow outside.
[21] Night photography and photography in mist and fog are possible using –
A.
ultra-violet radiation
B.
infra-red radiation
C.
microwave radiation
D.
gamma radiation
Ans:
infra-red radiation
Explanation :
Infrared is used in night vision equipment when there is insufficient visible light to see. Night vision devices operate through a process involving the conversion of ambient light photons into electrons which are then amplified by a chemical and electrical process and then converted back into visible light.
[22] An Athlets runs before long jump to get advantage on –
A.
Inertia of motion
B.
Frictional force
C.
Moment of a force
D.
Principle of moments
Ans:
Inertia of motion
Explanation :
An athlete does so to build up forward momentum so that when he jumps he already has a forward motion that would be greater than that of a jump made from standing in one spot. He needs forward momentum to get a good long jump and the best way is to have a running start. In this way, he gets advantage in terms of inertia of motion which is the tendency of an object to resist a change in motion.
[23] In sunlight, a rose appears red. In green light, the same rose appears –
A.
red
B.
black
C.
green
D.
yellow
Ans:
black
Explanation :
Any object which allows light to pass through it is known as a transparent object. The colour of any transparent object is the colour of the light transmitted by it. A red rose appears red in white light because it absorbs all colours except red. However, when seen in green light, it looks black because the red colour of the rose is absorbed by the green light.
[24] The sparkling of a diamond is due to –
A.
total internal reflection of light
B.
interference of light
C.
polarization of light
D.
refraction of light
Ans:
total internal reflection of light
Explanation :
Diamonds sparkle because of the total internal reflection of light. Diamonds have a very high refractive index, meaning they slow light down much more than glass; and if cut in the right manner, the angles of incidence can be made so that light seems to get 'trapped' within the diamond giving it it's sparkly appearance.
[25] Ocean currents are an example of –
A.
convection
B.
conduction
C.
insulation
D.
radiation
Ans:
convection
Explanation :
Heat is transferred by convection in numerous examples of naturally occurring fluid flow, such as: wind, oceanic currents, and movements within the Earth's atmosphere. Winds and ocean currents are examples of convection currents. Convection serves to transfer heat from the surplus to deficit heat zones and set the oceanic circulation in motion.
Explanation :
The decibel (abbreviated dB) is the unit used to measure the intensity of a sound. The decibel scale is a little odd because the human ear is incredibly sensitive. Our ears can hear everything from your fingertip brushing lightly over your skin to a loud jet engine. The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities. Thedecibel is used for a wide variety of measurements in science and engineering, most prominently in acoustics, electronics, and control theory.
[12] The term ‘Isoneph' indicates the lines of equal –
A.
cloudiness
B.
salinity
C.
rainfall
D.
pressure
Ans:
cloudiness
Explanation :
An isoneph is a line indicating equal cloud cover or equal cloudiness. Variations in the degrees of slope, temperature, occurrence of rainfall, may be represented by drawing the lines of equal values on a map. All such maps are termed as Isopleth Map. The word Isopleth is derived from ‘Iso’ meaning equal and ‘pleth’ means lines. Thus, an imaginary line, which joins the places of equal values, is referred as Isopleth. The more frequently drawn isopleths include Isotherm (equal temperature), Isobar (equal pressure), Isohyets (equal rainfall), Isonephs (equal cloudiness), Isohels (equal sunshine), contours (equal heights), Isobaths (equal depths), Isohaline (equal salinity), etc.
[13] Fibre optics work on the principle of –
A.
Scattering of light
B.
Total internal absorption
C.
Total internal reflection
D.
Optical rotation
Ans:
Total internal reflection
Explanation :
An optical fiber (or optical fibre) is a flexible, transparent fiber made of glass (silica) or plastic, slightly thicker than a human hair. It functions as a waveguide, or "light pipe", to transmit light between the two ends of the fiber. The field of applied science and engineering concerned with the design and application of optical fibers is known as fiber optics.
[14] A decibel is –
A.
A musical instrument
B.
The wavelength of noise
C.
A musical note
D.
A measure of sound level
Ans:
A measure of sound level
Explanation :
The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities.
[15] The type of mirrors used in the headlamps of cars is –
A.
Parabolic concave
B.
Plane
C.
Spherical convex
D.
Cylindrical concave
Ans:
Parabolic concave
Explanation :
Curved mirror that reflects light from its inner surface, the curve being inward. It may be either circular or parabolic in section. A concave mirror converges parallel light rays inward to the point of principal focus. The image formed by a concave mirror is real (reduced and inverted) if the object is not too close to the mirror. A real image is formed at the point of convergence. If the object is close to the mirror then the image formed will be virtual, enlarged, and upright, as the rays of light cannot converge to a point. Only a parabolic concave mirror has a true, single-point principal focus for parallel rays. For this reason, parabolic mirrors are used as reflectors to focus light in telescopes, or to focus microwaves in satellite communication systems.
[16] If lift is going up with acceleration, the apparent weight of a body is -
A.
may be more or less than true weight
B.
equal to the true weight
C.
less than the true weight
D.
more than the true weight
Ans:
more than the true weight
Explanation :
If lift is going up with acceleration, the apparent weight of a body is more than the true weight.
[17] The rate of transfer of charges through a circuit is called?
A.
Potential Difference
B.
Resistance
C.
Current
D.
Energy
Ans:
Current
Explanation :
The rate of transfer of charges through a circuit is called Current. An electric current is the rate of flow of electric charge past a point or region. An electric current is said to exist when there is a net flow of electric charge through a region.
[18] The filament of electric bulb is made up of :
A.
Copper
B.
Nichrome
C.
Lead
D.
Tungsten
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[19] When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to –
A.
reflection
B.
refraction
C.
forced vibrations
D.
damped vibrations
Ans:
forced vibrations
Explanation :
The tendency of one object to force another adjoining or interconnected object into vibrational motion is referred to as a forced vibration. In the case of the guitar string mounted to the sound box, the fact that the surface area of the sound box is greater than the surface area of the string means that more surrounding air particles will be forced into vibration. This causes an increase in the amplitude and thus loudness of the sound.
[20] Mud houses are cooler in summers and warmer in winters as compared to brick houses because –
A.
mud is a good conductor
B.
mud is a bad conductor
C.
mud is a poor insulator
D.
evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
Ans:
mud is a bad conductor
Explanation :
The houses made of mud and thatched roofs are cool in summer and warm in winter as the thatched roof contains large amount of trapped air and also mud is a bad conductor of heat. In summer, the outside heat cannot enter the house and in winter, inside heat cannot flow outside.
[21] Night photography and photography in mist and fog are possible using –
A.
ultra-violet radiation
B.
infra-red radiation
C.
microwave radiation
D.
gamma radiation
Ans:
infra-red radiation
Explanation :
Infrared is used in night vision equipment when there is insufficient visible light to see. Night vision devices operate through a process involving the conversion of ambient light photons into electrons which are then amplified by a chemical and electrical process and then converted back into visible light.
[22] An Athlets runs before long jump to get advantage on –
A.
Inertia of motion
B.
Frictional force
C.
Moment of a force
D.
Principle of moments
Ans:
Inertia of motion
Explanation :
An athlete does so to build up forward momentum so that when he jumps he already has a forward motion that would be greater than that of a jump made from standing in one spot. He needs forward momentum to get a good long jump and the best way is to have a running start. In this way, he gets advantage in terms of inertia of motion which is the tendency of an object to resist a change in motion.
[23] In sunlight, a rose appears red. In green light, the same rose appears –
A.
red
B.
black
C.
green
D.
yellow
Ans:
black
Explanation :
Any object which allows light to pass through it is known as a transparent object. The colour of any transparent object is the colour of the light transmitted by it. A red rose appears red in white light because it absorbs all colours except red. However, when seen in green light, it looks black because the red colour of the rose is absorbed by the green light.
[24] The sparkling of a diamond is due to –
A.
total internal reflection of light
B.
interference of light
C.
polarization of light
D.
refraction of light
Ans:
total internal reflection of light
Explanation :
Diamonds sparkle because of the total internal reflection of light. Diamonds have a very high refractive index, meaning they slow light down much more than glass; and if cut in the right manner, the angles of incidence can be made so that light seems to get 'trapped' within the diamond giving it it's sparkly appearance.
[25] Ocean currents are an example of –
A.
convection
B.
conduction
C.
insulation
D.
radiation
Ans:
convection
Explanation :
Heat is transferred by convection in numerous examples of naturally occurring fluid flow, such as: wind, oceanic currents, and movements within the Earth's atmosphere. Winds and ocean currents are examples of convection currents. Convection serves to transfer heat from the surplus to deficit heat zones and set the oceanic circulation in motion.
Explanation :
An optical fiber (or optical fibre) is a flexible, transparent fiber made of glass (silica) or plastic, slightly thicker than a human hair. It functions as a waveguide, or "light pipe", to transmit light between the two ends of the fiber. The field of applied science and engineering concerned with the design and application of optical fibers is known as fiber optics.
[14] A decibel is –
A.
A musical instrument
B.
The wavelength of noise
C.
A musical note
D.
A measure of sound level
Ans:
A measure of sound level
Explanation :
The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities.
[15] The type of mirrors used in the headlamps of cars is –
A.
Parabolic concave
B.
Plane
C.
Spherical convex
D.
Cylindrical concave
Ans:
Parabolic concave
Explanation :
Curved mirror that reflects light from its inner surface, the curve being inward. It may be either circular or parabolic in section. A concave mirror converges parallel light rays inward to the point of principal focus. The image formed by a concave mirror is real (reduced and inverted) if the object is not too close to the mirror. A real image is formed at the point of convergence. If the object is close to the mirror then the image formed will be virtual, enlarged, and upright, as the rays of light cannot converge to a point. Only a parabolic concave mirror has a true, single-point principal focus for parallel rays. For this reason, parabolic mirrors are used as reflectors to focus light in telescopes, or to focus microwaves in satellite communication systems.
[16] If lift is going up with acceleration, the apparent weight of a body is -
A.
may be more or less than true weight
B.
equal to the true weight
C.
less than the true weight
D.
more than the true weight
Ans:
more than the true weight
Explanation :
If lift is going up with acceleration, the apparent weight of a body is more than the true weight.
[17] The rate of transfer of charges through a circuit is called?
A.
Potential Difference
B.
Resistance
C.
Current
D.
Energy
Ans:
Current
Explanation :
The rate of transfer of charges through a circuit is called Current. An electric current is the rate of flow of electric charge past a point or region. An electric current is said to exist when there is a net flow of electric charge through a region.
[18] The filament of electric bulb is made up of :
A.
Copper
B.
Nichrome
C.
Lead
D.
Tungsten
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[19] When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to –
A.
reflection
B.
refraction
C.
forced vibrations
D.
damped vibrations
Ans:
forced vibrations
Explanation :
The tendency of one object to force another adjoining or interconnected object into vibrational motion is referred to as a forced vibration. In the case of the guitar string mounted to the sound box, the fact that the surface area of the sound box is greater than the surface area of the string means that more surrounding air particles will be forced into vibration. This causes an increase in the amplitude and thus loudness of the sound.
[20] Mud houses are cooler in summers and warmer in winters as compared to brick houses because –
A.
mud is a good conductor
B.
mud is a bad conductor
C.
mud is a poor insulator
D.
evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
Ans:
mud is a bad conductor
Explanation :
The houses made of mud and thatched roofs are cool in summer and warm in winter as the thatched roof contains large amount of trapped air and also mud is a bad conductor of heat. In summer, the outside heat cannot enter the house and in winter, inside heat cannot flow outside.
[21] Night photography and photography in mist and fog are possible using –
A.
ultra-violet radiation
B.
infra-red radiation
C.
microwave radiation
D.
gamma radiation
Ans:
infra-red radiation
Explanation :
Infrared is used in night vision equipment when there is insufficient visible light to see. Night vision devices operate through a process involving the conversion of ambient light photons into electrons which are then amplified by a chemical and electrical process and then converted back into visible light.
[22] An Athlets runs before long jump to get advantage on –
A.
Inertia of motion
B.
Frictional force
C.
Moment of a force
D.
Principle of moments
Ans:
Inertia of motion
Explanation :
An athlete does so to build up forward momentum so that when he jumps he already has a forward motion that would be greater than that of a jump made from standing in one spot. He needs forward momentum to get a good long jump and the best way is to have a running start. In this way, he gets advantage in terms of inertia of motion which is the tendency of an object to resist a change in motion.
[23] In sunlight, a rose appears red. In green light, the same rose appears –
A.
red
B.
black
C.
green
D.
yellow
Ans:
black
Explanation :
Any object which allows light to pass through it is known as a transparent object. The colour of any transparent object is the colour of the light transmitted by it. A red rose appears red in white light because it absorbs all colours except red. However, when seen in green light, it looks black because the red colour of the rose is absorbed by the green light.
[24] The sparkling of a diamond is due to –
A.
total internal reflection of light
B.
interference of light
C.
polarization of light
D.
refraction of light
Ans:
total internal reflection of light
Explanation :
Diamonds sparkle because of the total internal reflection of light. Diamonds have a very high refractive index, meaning they slow light down much more than glass; and if cut in the right manner, the angles of incidence can be made so that light seems to get 'trapped' within the diamond giving it it's sparkly appearance.
[25] Ocean currents are an example of –
A.
convection
B.
conduction
C.
insulation
D.
radiation
Ans:
convection
Explanation :
Heat is transferred by convection in numerous examples of naturally occurring fluid flow, such as: wind, oceanic currents, and movements within the Earth's atmosphere. Winds and ocean currents are examples of convection currents. Convection serves to transfer heat from the surplus to deficit heat zones and set the oceanic circulation in motion.
Explanation :
Curved mirror that reflects light from its inner surface, the curve being inward. It may be either circular or parabolic in section. A concave mirror converges parallel light rays inward to the point of principal focus. The image formed by a concave mirror is real (reduced and inverted) if the object is not too close to the mirror. A real image is formed at the point of convergence. If the object is close to the mirror then the image formed will be virtual, enlarged, and upright, as the rays of light cannot converge to a point. Only a parabolic concave mirror has a true, single-point principal focus for parallel rays. For this reason, parabolic mirrors are used as reflectors to focus light in telescopes, or to focus microwaves in satellite communication systems.
[16] If lift is going up with acceleration, the apparent weight of a body is -
A.
may be more or less than true weight
B.
equal to the true weight
C.
less than the true weight
D.
more than the true weight
Ans:
more than the true weight
Explanation :
If lift is going up with acceleration, the apparent weight of a body is more than the true weight.
[17] The rate of transfer of charges through a circuit is called?
A.
Potential Difference
B.
Resistance
C.
Current
D.
Energy
Ans:
Current
Explanation :
The rate of transfer of charges through a circuit is called Current. An electric current is the rate of flow of electric charge past a point or region. An electric current is said to exist when there is a net flow of electric charge through a region.
[18] The filament of electric bulb is made up of :
A.
Copper
B.
Nichrome
C.
Lead
D.
Tungsten
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[19] When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to –
A.
reflection
B.
refraction
C.
forced vibrations
D.
damped vibrations
Ans:
forced vibrations
Explanation :
The tendency of one object to force another adjoining or interconnected object into vibrational motion is referred to as a forced vibration. In the case of the guitar string mounted to the sound box, the fact that the surface area of the sound box is greater than the surface area of the string means that more surrounding air particles will be forced into vibration. This causes an increase in the amplitude and thus loudness of the sound.
[20] Mud houses are cooler in summers and warmer in winters as compared to brick houses because –
A.
mud is a good conductor
B.
mud is a bad conductor
C.
mud is a poor insulator
D.
evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
Ans:
mud is a bad conductor
Explanation :
The houses made of mud and thatched roofs are cool in summer and warm in winter as the thatched roof contains large amount of trapped air and also mud is a bad conductor of heat. In summer, the outside heat cannot enter the house and in winter, inside heat cannot flow outside.
[21] Night photography and photography in mist and fog are possible using –
A.
ultra-violet radiation
B.
infra-red radiation
C.
microwave radiation
D.
gamma radiation
Ans:
infra-red radiation
Explanation :
Infrared is used in night vision equipment when there is insufficient visible light to see. Night vision devices operate through a process involving the conversion of ambient light photons into electrons which are then amplified by a chemical and electrical process and then converted back into visible light.
[22] An Athlets runs before long jump to get advantage on –
A.
Inertia of motion
B.
Frictional force
C.
Moment of a force
D.
Principle of moments
Ans:
Inertia of motion
Explanation :
An athlete does so to build up forward momentum so that when he jumps he already has a forward motion that would be greater than that of a jump made from standing in one spot. He needs forward momentum to get a good long jump and the best way is to have a running start. In this way, he gets advantage in terms of inertia of motion which is the tendency of an object to resist a change in motion.
[23] In sunlight, a rose appears red. In green light, the same rose appears –
A.
red
B.
black
C.
green
D.
yellow
Ans:
black
Explanation :
Any object which allows light to pass through it is known as a transparent object. The colour of any transparent object is the colour of the light transmitted by it. A red rose appears red in white light because it absorbs all colours except red. However, when seen in green light, it looks black because the red colour of the rose is absorbed by the green light.
[24] The sparkling of a diamond is due to –
A.
total internal reflection of light
B.
interference of light
C.
polarization of light
D.
refraction of light
Ans:
total internal reflection of light
Explanation :
Diamonds sparkle because of the total internal reflection of light. Diamonds have a very high refractive index, meaning they slow light down much more than glass; and if cut in the right manner, the angles of incidence can be made so that light seems to get 'trapped' within the diamond giving it it's sparkly appearance.
[25] Ocean currents are an example of –
A.
convection
B.
conduction
C.
insulation
D.
radiation
Ans:
convection
Explanation :
Heat is transferred by convection in numerous examples of naturally occurring fluid flow, such as: wind, oceanic currents, and movements within the Earth's atmosphere. Winds and ocean currents are examples of convection currents. Convection serves to transfer heat from the surplus to deficit heat zones and set the oceanic circulation in motion.
Explanation :
The rate of transfer of charges through a circuit is called Current. An electric current is the rate of flow of electric charge past a point or region. An electric current is said to exist when there is a net flow of electric charge through a region.
[18] The filament of electric bulb is made up of :
A.
Copper
B.
Nichrome
C.
Lead
D.
Tungsten
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[19] When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to –
A.
reflection
B.
refraction
C.
forced vibrations
D.
damped vibrations
Ans:
forced vibrations
Explanation :
The tendency of one object to force another adjoining or interconnected object into vibrational motion is referred to as a forced vibration. In the case of the guitar string mounted to the sound box, the fact that the surface area of the sound box is greater than the surface area of the string means that more surrounding air particles will be forced into vibration. This causes an increase in the amplitude and thus loudness of the sound.
[20] Mud houses are cooler in summers and warmer in winters as compared to brick houses because –
A.
mud is a good conductor
B.
mud is a bad conductor
C.
mud is a poor insulator
D.
evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
Ans:
mud is a bad conductor
Explanation :
The houses made of mud and thatched roofs are cool in summer and warm in winter as the thatched roof contains large amount of trapped air and also mud is a bad conductor of heat. In summer, the outside heat cannot enter the house and in winter, inside heat cannot flow outside.
[21] Night photography and photography in mist and fog are possible using –
A.
ultra-violet radiation
B.
infra-red radiation
C.
microwave radiation
D.
gamma radiation
Ans:
infra-red radiation
Explanation :
Infrared is used in night vision equipment when there is insufficient visible light to see. Night vision devices operate through a process involving the conversion of ambient light photons into electrons which are then amplified by a chemical and electrical process and then converted back into visible light.
[22] An Athlets runs before long jump to get advantage on –
A.
Inertia of motion
B.
Frictional force
C.
Moment of a force
D.
Principle of moments
Ans:
Inertia of motion
Explanation :
An athlete does so to build up forward momentum so that when he jumps he already has a forward motion that would be greater than that of a jump made from standing in one spot. He needs forward momentum to get a good long jump and the best way is to have a running start. In this way, he gets advantage in terms of inertia of motion which is the tendency of an object to resist a change in motion.
[23] In sunlight, a rose appears red. In green light, the same rose appears –
A.
red
B.
black
C.
green
D.
yellow
Ans:
black
Explanation :
Any object which allows light to pass through it is known as a transparent object. The colour of any transparent object is the colour of the light transmitted by it. A red rose appears red in white light because it absorbs all colours except red. However, when seen in green light, it looks black because the red colour of the rose is absorbed by the green light.
[24] The sparkling of a diamond is due to –
A.
total internal reflection of light
B.
interference of light
C.
polarization of light
D.
refraction of light
Ans:
total internal reflection of light
Explanation :
Diamonds sparkle because of the total internal reflection of light. Diamonds have a very high refractive index, meaning they slow light down much more than glass; and if cut in the right manner, the angles of incidence can be made so that light seems to get 'trapped' within the diamond giving it it's sparkly appearance.
[25] Ocean currents are an example of –
A.
convection
B.
conduction
C.
insulation
D.
radiation
Ans:
convection
Explanation :
Heat is transferred by convection in numerous examples of naturally occurring fluid flow, such as: wind, oceanic currents, and movements within the Earth's atmosphere. Winds and ocean currents are examples of convection currents. Convection serves to transfer heat from the surplus to deficit heat zones and set the oceanic circulation in motion.
Explanation :
The tendency of one object to force another adjoining or interconnected object into vibrational motion is referred to as a forced vibration. In the case of the guitar string mounted to the sound box, the fact that the surface area of the sound box is greater than the surface area of the string means that more surrounding air particles will be forced into vibration. This causes an increase in the amplitude and thus loudness of the sound.
[20] Mud houses are cooler in summers and warmer in winters as compared to brick houses because –
A.
mud is a good conductor
B.
mud is a bad conductor
C.
mud is a poor insulator
D.
evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
Ans:
mud is a bad conductor
Explanation :
The houses made of mud and thatched roofs are cool in summer and warm in winter as the thatched roof contains large amount of trapped air and also mud is a bad conductor of heat. In summer, the outside heat cannot enter the house and in winter, inside heat cannot flow outside.
[21] Night photography and photography in mist and fog are possible using –
A.
ultra-violet radiation
B.
infra-red radiation
C.
microwave radiation
D.
gamma radiation
Ans:
infra-red radiation
Explanation :
Infrared is used in night vision equipment when there is insufficient visible light to see. Night vision devices operate through a process involving the conversion of ambient light photons into electrons which are then amplified by a chemical and electrical process and then converted back into visible light.
[22] An Athlets runs before long jump to get advantage on –
A.
Inertia of motion
B.
Frictional force
C.
Moment of a force
D.
Principle of moments
Ans:
Inertia of motion
Explanation :
An athlete does so to build up forward momentum so that when he jumps he already has a forward motion that would be greater than that of a jump made from standing in one spot. He needs forward momentum to get a good long jump and the best way is to have a running start. In this way, he gets advantage in terms of inertia of motion which is the tendency of an object to resist a change in motion.
[23] In sunlight, a rose appears red. In green light, the same rose appears –
A.
red
B.
black
C.
green
D.
yellow
Ans:
black
Explanation :
Any object which allows light to pass through it is known as a transparent object. The colour of any transparent object is the colour of the light transmitted by it. A red rose appears red in white light because it absorbs all colours except red. However, when seen in green light, it looks black because the red colour of the rose is absorbed by the green light.
[24] The sparkling of a diamond is due to –
A.
total internal reflection of light
B.
interference of light
C.
polarization of light
D.
refraction of light
Ans:
total internal reflection of light
Explanation :
Diamonds sparkle because of the total internal reflection of light. Diamonds have a very high refractive index, meaning they slow light down much more than glass; and if cut in the right manner, the angles of incidence can be made so that light seems to get 'trapped' within the diamond giving it it's sparkly appearance.
[25] Ocean currents are an example of –
A.
convection
B.
conduction
C.
insulation
D.
radiation
Ans:
convection
Explanation :
Heat is transferred by convection in numerous examples of naturally occurring fluid flow, such as: wind, oceanic currents, and movements within the Earth's atmosphere. Winds and ocean currents are examples of convection currents. Convection serves to transfer heat from the surplus to deficit heat zones and set the oceanic circulation in motion.
Explanation :
Infrared is used in night vision equipment when there is insufficient visible light to see. Night vision devices operate through a process involving the conversion of ambient light photons into electrons which are then amplified by a chemical and electrical process and then converted back into visible light.
[22] An Athlets runs before long jump to get advantage on –
A.
Inertia of motion
B.
Frictional force
C.
Moment of a force
D.
Principle of moments
Ans:
Inertia of motion
Explanation :
An athlete does so to build up forward momentum so that when he jumps he already has a forward motion that would be greater than that of a jump made from standing in one spot. He needs forward momentum to get a good long jump and the best way is to have a running start. In this way, he gets advantage in terms of inertia of motion which is the tendency of an object to resist a change in motion.
[23] In sunlight, a rose appears red. In green light, the same rose appears –
A.
red
B.
black
C.
green
D.
yellow
Ans:
black
Explanation :
Any object which allows light to pass through it is known as a transparent object. The colour of any transparent object is the colour of the light transmitted by it. A red rose appears red in white light because it absorbs all colours except red. However, when seen in green light, it looks black because the red colour of the rose is absorbed by the green light.
[24] The sparkling of a diamond is due to –
A.
total internal reflection of light
B.
interference of light
C.
polarization of light
D.
refraction of light
Ans:
total internal reflection of light
Explanation :
Diamonds sparkle because of the total internal reflection of light. Diamonds have a very high refractive index, meaning they slow light down much more than glass; and if cut in the right manner, the angles of incidence can be made so that light seems to get 'trapped' within the diamond giving it it's sparkly appearance.
[25] Ocean currents are an example of –
A.
convection
B.
conduction
C.
insulation
D.
radiation
Ans:
convection
Explanation :
Heat is transferred by convection in numerous examples of naturally occurring fluid flow, such as: wind, oceanic currents, and movements within the Earth's atmosphere. Winds and ocean currents are examples of convection currents. Convection serves to transfer heat from the surplus to deficit heat zones and set the oceanic circulation in motion.
Explanation :
Any object which allows light to pass through it is known as a transparent object. The colour of any transparent object is the colour of the light transmitted by it. A red rose appears red in white light because it absorbs all colours except red. However, when seen in green light, it looks black because the red colour of the rose is absorbed by the green light.
[24] The sparkling of a diamond is due to –
A.
total internal reflection of light
B.
interference of light
C.
polarization of light
D.
refraction of light
Ans:
total internal reflection of light
Explanation :
Diamonds sparkle because of the total internal reflection of light. Diamonds have a very high refractive index, meaning they slow light down much more than glass; and if cut in the right manner, the angles of incidence can be made so that light seems to get 'trapped' within the diamond giving it it's sparkly appearance.
[25] Ocean currents are an example of –
A.
convection
B.
conduction
C.
insulation
D.
radiation
Ans:
convection
Explanation :
Heat is transferred by convection in numerous examples of naturally occurring fluid flow, such as: wind, oceanic currents, and movements within the Earth's atmosphere. Winds and ocean currents are examples of convection currents. Convection serves to transfer heat from the surplus to deficit heat zones and set the oceanic circulation in motion.
Explanation :
Heat is transferred by convection in numerous examples of naturally occurring fluid flow, such as: wind, oceanic currents, and movements within the Earth's atmosphere. Winds and ocean currents are examples of convection currents. Convection serves to transfer heat from the surplus to deficit heat zones and set the oceanic circulation in motion.