[1] The passengers standing in a bus fall in the backward direction when the stationary bus begins to move. Which of the following laws explains this situation?
A.
Newton's First Law of Motion
B.
Newton's Third Law of Motion
C.
Newton's Second Law of Motion
D.
The Law of Conservation of Momentum
Ans:
Newton's First Law of Motion
Explanation :
According to Newton's first law of motion (law of inertia) a body either at rest or in uniform motion will remain so unless acted on by a force When the passengers are standing on the bus, they (and the bus) are in a state of uniform motion.
[2] Plants are dried up in winter due to frost because –
A.
Evaporation does not take place
B.
Photosynthesis does not take place at such low temperature
C.
Respiration does not take place at low temperature
D.
There is mechanical loss of tissues and drought condition prevails
Ans:
There is mechanical loss of tissues and drought condition prevails
Explanation :
Respiration does not rely on the sun, so it is possible for plants to respire around the clock. The rate of respiration is dependent on temperature: The warmer it is, the more a plant will respire. Drought, extreme winter or frost and heat injury all create a situation for the plant where moisture is not adequate to maintain the proper water levels in plant tissues. Extreme winter cold and frost are similar to summer drought in that frozen water is unavailable to the plant. The air is very dry as well.
[3] Radio telescopes are better than optical telescopes because -
A.
they can detect faint galaxies which no optical telescope can
B.
they can work even in cloudy conditions
C.
they can work during the day and night
D.
All of the above
Ans:
All of the above
Explanation :
Radio telescopes are much larger than optical telescopes because radio wavelengths are much longer than optical wavelengths. The longer wavelengths mean that the radio waves have lower energy than optical light waves.
[4] White clothes are cooler than black ones because they –
A.
absorb all the light that reaches them
B.
reflect all the light that reaches them
C.
will not allow the light to penetrate
D.
cool the sunlight completely
Ans:
reflect all the light that reaches them
Explanation :
The coolness and warmth associated with clothes is because of their reflective or absorptive capacities. White clothes are good reflectors of light, thereby keeping the body cool. The opposite is the case with black clothes.
[5] Sound is heard over longer distances on rainy days because –
A.
sound travels slowly in moist air
B.
sound travels faster in moist air
C.
moist air does not absorb sound
D.
moist air absorbs sound
Ans:
sound travels faster in moist air
Explanation :
The speed of sound in a medium is inversely proportional to the square root of its density. Higher is the humidity in the air, greater will be the velocity of sound. Therefore, the speed of sound in moist air is more than that in dry air. This is why the sirens of mills, whistle of trains and others are heard up to longer distances on a rainy day than on a dry day.
[6] Rectifiers are used to convert -
A.
Direct current to Alternating current
B.
Alternating current to Direct current
C.
high voltage to low voltage
D.
low voltage to high voltage
Ans:
Alternating current to Direct current
Explanation :
Converting DC power from one voltage to another is much more complicated. One method of DC-to-DC conversion first converts power to AC (using a device called an inverter), then uses a transformer to change the voltage, and finally rectifies power back to DC.
[7] A galvanometer can be converted to a voltmeter by connecting –
A.
a high resistance in parallel
B.
a high resistance in series
C.
a low resistance in series
D.
a low resistance in parallel
Ans:
a high resistance in series
Explanation :
In order to convert a Galvanometer into voltmeter, a very high resistance known as "series resistance" is connected in series with the galvanometer. The con-version is made for enabling the galvanometer to measure the potential difference across any component in a circuit.
[8] Copper wires are generally used for electrical power transmission instead of iron wire because –
A.
copper is cheaper than iron
B.
copper is lighter than iron
C.
copper is a better conductor of electricity than iron
D.
copper can take higher power than iron
Ans:
copper is a better conductor of electricity than iron
Explanation :
Copper is generally preferred for electrical power transmission instead of iron because of its high electrical conductivity and low resistivity.
[9] The natural environment refers to -
A.
The living organisms and non-living objects or factors in an area undisturbed by human activity
B.
The atmosphere in a forest
C.
The plants and animals in a forest
D.
The atmosphere of an area-a forest, lake or an ocean
Ans:
The living organisms and non-living objects or factors in an area undisturbed by human activity
Explanation :
[10] Rainbows are produced when sunlight -
A.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
B.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
C.
Incident on raindrops hanging in the atmosphere is dispersed after suffering reflection.
D.
None of the given statements is correct.
Ans:
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
Explanation :
When the light rays from the Sun are incident on water drops hanging in the atmosphere; these rays are dispersed into seven colours of white light and internally reflected by the drops. This dispersion and internal reflection results in production of colour arcs which appear hanging in the sky and known as rainbow.
[11] The information of brilliant colors in a thin soap film is a consequence of the phenomena of -
A.
Polarization and interference
B.
Diffraction and dispersion
C.
Multiple refraction and dispersion
D.
Multiple reflection and interference
Ans:
Multiple reflection and interference
Explanation :
Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
[12] Purpose of an optical filter is to –
A.
reflect lights of different colours
B.
dispense light into component colours
C.
refract light of different colours
D.
transmit or absorb light of different colours
Ans:
transmit or absorb light of different colours
Explanation :
Optical filters are devices that selectively transmit light in a particular range of wavelengths, that is, colors, while blocking the remainder. They are commonly used in photography (where some special effect filters are occasionally used as well as absorptive filters), fluorescence microscopy, spectroscopy, clinical chemistry, colour stage lighting, etc.
[13] Why are covalent compounds poor conductors of electricity?
A.
Due to the presence of charged particles.
B.
Due to the absence of charged particles.
C.
Due to the presence of a triple bond.
D.
None of the above
Ans:
Due to the absence of charged particles.
Explanation :
In a covalent compound, electrons are shared between atoms. This leaves no free electrons and hence there and no charged particles. This leads to covalent compounds being poor conductors of electricity.
[14] Which of the following is not correct?
A.
Ammeter measures the strength of electric current.
B.
Lactometer measures the relative density of milk.
C.
Rain gauge measures rain fall
D.
Hygrometer measures sound under water.
Ans:
Hygrometer measures sound under water.
Explanation :
A hygrometer is a weather instrument used to measure the amount of humidity in the atmosphere
[15] Which one of the following processes is responsible for the glittering of air bubble rising through water?
A.
Reflection of light
B.
Refraction of light
C.
Total internal reflection of light
D.
Scattering of light
Ans:
Total internal reflection of light
Explanation :
Total internal reflection is responsible for glittering which occurs when the light from a denser media (liquid) tries to enter less dense media (air in bubble). This reflected light when captured by our eyes is seen as glittering.
[16] Railway tracks are banked on curves so that :
A.
the train may not fall down inwards.
B.
the weight of the train may be reduced.
C.
necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track.
D.
no frictional force may be produced between the wheels and the track.
Ans:
necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track.
Explanation :
A vehicle moving at a fast speed on a straight rail/ road has a large inertia, i.e. tendency to keep moving in the same direction at the same speed. When it takes a circular turn on a curved rail/road, it experiences an additional force, termed as centripetal force, acting towards the centre of the circle.
[17] An electron microscope gives higher magnifications than an optical microscope, because –
A.
The velocity of electrons is smaller than that of light
B.
The wavelength of electrons is smaller as compared to the wavelength of visible light
C.
The electrons have more energy than the light particulars
D.
The electron microscope uses more powerful lenses
Ans:
The wavelength of electrons is smaller as compared to the wavelength of visible light
Explanation :
An electron microscope uses a beam of electrons to illuminate a specimen and produce a magnified image. An electron microscope (EM) has greater resolving power than a light-powered optical microscope because electrons have wavelengths about 100,000 times shorter than visible light photons. Magnification is the process of enlarging something only in appearance, not in physical size. This enlargement is quantified by a calculated number also called “magnification”. When this number is less than one it refers to a reduction in size, sometimes called “de-magnification”.
[18] Nichrome wire is used in an electric heater because .
A.
It has high resistance
B.
It has high melting point
C.
It can resist a current upto approx 5 amperes
D.
For all of the above reasons
Ans:
For all of the above reasons
Explanation :
Nichrome is used in electric iron because it has high resistance and it is stable in air when hot. Nichrome wire forms a protective layer of chromium oxide. Chemically it is quite stable and does not combine with other atmospheric gases even in high temperature.
[19] Out of the following pairs, which one does not have identical dimension?
A.
Moment of inertia and moment of a force
B.
Work and Torque
C.
Angular momentum and Planck's constant
D.
Impulse and Momentum
Ans:
Moment of inertia and moment of a force
Explanation :
0
[20] A concave lens always forms –
A.
a real image
B.
a virtual image
C.
an Image type which depends on object characteristics
D.
an image type which depends on lens curvature
Ans:
a virtual image
Explanation :
Concave lens always form the virtual and erect image and the image is always diminished. Convex lens forms real image as well as virtual image. It forms both enlarged image and the diminished image.
[21] Ondometer is a -
A.
Measuring instrument for distance covered by motor wheels
B.
Measuring instrument for frequency of electromagnetic waves
C.
Device for measuring sound intensity
D.
Measuring instrument for electric power
Ans:
Measuring instrument for frequency of electromagnetic waves
Explanation :
0
[22] Specific gravity is defined as the ratio of –
A.
density of the substance to the density of water
B.
density of the substance to the density of water at 0°C
C.
density of water at 4°C to the density of the substance
D.
density of the substance to the density of water at 4°C
Ans:
density of the substance to the density of water
Explanation :
Specific gravity is the ratio of the density of a substance to the density (mass of the same unit volume) of a reference substance. The reference substance is nearly always water for liquids or air for gases.
[23] Which one of the following is responsible for the working of Newton's colour disc experiment?
A.
Formation of pure spectra
B.
Formation of impure spectra
C.
Persistence of vision
D.
Principle of complementary colour
Ans:
Persistence of vision
Explanation :
A Newton Disc can be created by painting a disc with the seven different colours. A combination of red, green and blue in the circular disc will yield the same result. This is due to the phenomenon called persistence of vision.
[24] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
The motion of an object is said to be rotatory if the particles of the object rotate in a circular path with respect to an imaginary axis, known as the axis of rotation.
[25] The first law of thermodynamics is simply the case of –
A.
Charles law
B.
Newton's law of cooling
C.
The law of heat exchange
D.
The law of conservation of energy
Ans:
The law of conservation of energy
Explanation :
The first law of thennodynamics is a version of the law of conservation of energy for thermodynamic systems. It states That the change in the internal energy of a system is equal to the heat added to the system plus the work done on the system.
Explanation :
According to Newton's first law of motion (law of inertia) a body either at rest or in uniform motion will remain so unless acted on by a force When the passengers are standing on the bus, they (and the bus) are in a state of uniform motion.
[2] Plants are dried up in winter due to frost because –
A.
Evaporation does not take place
B.
Photosynthesis does not take place at such low temperature
C.
Respiration does not take place at low temperature
D.
There is mechanical loss of tissues and drought condition prevails
Ans:
There is mechanical loss of tissues and drought condition prevails
Explanation :
Respiration does not rely on the sun, so it is possible for plants to respire around the clock. The rate of respiration is dependent on temperature: The warmer it is, the more a plant will respire. Drought, extreme winter or frost and heat injury all create a situation for the plant where moisture is not adequate to maintain the proper water levels in plant tissues. Extreme winter cold and frost are similar to summer drought in that frozen water is unavailable to the plant. The air is very dry as well.
[3] Radio telescopes are better than optical telescopes because -
A.
they can detect faint galaxies which no optical telescope can
B.
they can work even in cloudy conditions
C.
they can work during the day and night
D.
All of the above
Ans:
All of the above
Explanation :
Radio telescopes are much larger than optical telescopes because radio wavelengths are much longer than optical wavelengths. The longer wavelengths mean that the radio waves have lower energy than optical light waves.
[4] White clothes are cooler than black ones because they –
A.
absorb all the light that reaches them
B.
reflect all the light that reaches them
C.
will not allow the light to penetrate
D.
cool the sunlight completely
Ans:
reflect all the light that reaches them
Explanation :
The coolness and warmth associated with clothes is because of their reflective or absorptive capacities. White clothes are good reflectors of light, thereby keeping the body cool. The opposite is the case with black clothes.
[5] Sound is heard over longer distances on rainy days because –
A.
sound travels slowly in moist air
B.
sound travels faster in moist air
C.
moist air does not absorb sound
D.
moist air absorbs sound
Ans:
sound travels faster in moist air
Explanation :
The speed of sound in a medium is inversely proportional to the square root of its density. Higher is the humidity in the air, greater will be the velocity of sound. Therefore, the speed of sound in moist air is more than that in dry air. This is why the sirens of mills, whistle of trains and others are heard up to longer distances on a rainy day than on a dry day.
[6] Rectifiers are used to convert -
A.
Direct current to Alternating current
B.
Alternating current to Direct current
C.
high voltage to low voltage
D.
low voltage to high voltage
Ans:
Alternating current to Direct current
Explanation :
Converting DC power from one voltage to another is much more complicated. One method of DC-to-DC conversion first converts power to AC (using a device called an inverter), then uses a transformer to change the voltage, and finally rectifies power back to DC.
[7] A galvanometer can be converted to a voltmeter by connecting –
A.
a high resistance in parallel
B.
a high resistance in series
C.
a low resistance in series
D.
a low resistance in parallel
Ans:
a high resistance in series
Explanation :
In order to convert a Galvanometer into voltmeter, a very high resistance known as "series resistance" is connected in series with the galvanometer. The con-version is made for enabling the galvanometer to measure the potential difference across any component in a circuit.
[8] Copper wires are generally used for electrical power transmission instead of iron wire because –
A.
copper is cheaper than iron
B.
copper is lighter than iron
C.
copper is a better conductor of electricity than iron
D.
copper can take higher power than iron
Ans:
copper is a better conductor of electricity than iron
Explanation :
Copper is generally preferred for electrical power transmission instead of iron because of its high electrical conductivity and low resistivity.
[9] The natural environment refers to -
A.
The living organisms and non-living objects or factors in an area undisturbed by human activity
B.
The atmosphere in a forest
C.
The plants and animals in a forest
D.
The atmosphere of an area-a forest, lake or an ocean
Ans:
The living organisms and non-living objects or factors in an area undisturbed by human activity
Explanation :
[10] Rainbows are produced when sunlight -
A.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
B.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
C.
Incident on raindrops hanging in the atmosphere is dispersed after suffering reflection.
D.
None of the given statements is correct.
Ans:
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
Explanation :
When the light rays from the Sun are incident on water drops hanging in the atmosphere; these rays are dispersed into seven colours of white light and internally reflected by the drops. This dispersion and internal reflection results in production of colour arcs which appear hanging in the sky and known as rainbow.
[11] The information of brilliant colors in a thin soap film is a consequence of the phenomena of -
A.
Polarization and interference
B.
Diffraction and dispersion
C.
Multiple refraction and dispersion
D.
Multiple reflection and interference
Ans:
Multiple reflection and interference
Explanation :
Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
[12] Purpose of an optical filter is to –
A.
reflect lights of different colours
B.
dispense light into component colours
C.
refract light of different colours
D.
transmit or absorb light of different colours
Ans:
transmit or absorb light of different colours
Explanation :
Optical filters are devices that selectively transmit light in a particular range of wavelengths, that is, colors, while blocking the remainder. They are commonly used in photography (where some special effect filters are occasionally used as well as absorptive filters), fluorescence microscopy, spectroscopy, clinical chemistry, colour stage lighting, etc.
[13] Why are covalent compounds poor conductors of electricity?
A.
Due to the presence of charged particles.
B.
Due to the absence of charged particles.
C.
Due to the presence of a triple bond.
D.
None of the above
Ans:
Due to the absence of charged particles.
Explanation :
In a covalent compound, electrons are shared between atoms. This leaves no free electrons and hence there and no charged particles. This leads to covalent compounds being poor conductors of electricity.
[14] Which of the following is not correct?
A.
Ammeter measures the strength of electric current.
B.
Lactometer measures the relative density of milk.
C.
Rain gauge measures rain fall
D.
Hygrometer measures sound under water.
Ans:
Hygrometer measures sound under water.
Explanation :
A hygrometer is a weather instrument used to measure the amount of humidity in the atmosphere
[15] Which one of the following processes is responsible for the glittering of air bubble rising through water?
A.
Reflection of light
B.
Refraction of light
C.
Total internal reflection of light
D.
Scattering of light
Ans:
Total internal reflection of light
Explanation :
Total internal reflection is responsible for glittering which occurs when the light from a denser media (liquid) tries to enter less dense media (air in bubble). This reflected light when captured by our eyes is seen as glittering.
[16] Railway tracks are banked on curves so that :
A.
the train may not fall down inwards.
B.
the weight of the train may be reduced.
C.
necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track.
D.
no frictional force may be produced between the wheels and the track.
Ans:
necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track.
Explanation :
A vehicle moving at a fast speed on a straight rail/ road has a large inertia, i.e. tendency to keep moving in the same direction at the same speed. When it takes a circular turn on a curved rail/road, it experiences an additional force, termed as centripetal force, acting towards the centre of the circle.
[17] An electron microscope gives higher magnifications than an optical microscope, because –
A.
The velocity of electrons is smaller than that of light
B.
The wavelength of electrons is smaller as compared to the wavelength of visible light
C.
The electrons have more energy than the light particulars
D.
The electron microscope uses more powerful lenses
Ans:
The wavelength of electrons is smaller as compared to the wavelength of visible light
Explanation :
An electron microscope uses a beam of electrons to illuminate a specimen and produce a magnified image. An electron microscope (EM) has greater resolving power than a light-powered optical microscope because electrons have wavelengths about 100,000 times shorter than visible light photons. Magnification is the process of enlarging something only in appearance, not in physical size. This enlargement is quantified by a calculated number also called “magnification”. When this number is less than one it refers to a reduction in size, sometimes called “de-magnification”.
[18] Nichrome wire is used in an electric heater because .
A.
It has high resistance
B.
It has high melting point
C.
It can resist a current upto approx 5 amperes
D.
For all of the above reasons
Ans:
For all of the above reasons
Explanation :
Nichrome is used in electric iron because it has high resistance and it is stable in air when hot. Nichrome wire forms a protective layer of chromium oxide. Chemically it is quite stable and does not combine with other atmospheric gases even in high temperature.
[19] Out of the following pairs, which one does not have identical dimension?
A.
Moment of inertia and moment of a force
B.
Work and Torque
C.
Angular momentum and Planck's constant
D.
Impulse and Momentum
Ans:
Moment of inertia and moment of a force
Explanation :
0
[20] A concave lens always forms –
A.
a real image
B.
a virtual image
C.
an Image type which depends on object characteristics
D.
an image type which depends on lens curvature
Ans:
a virtual image
Explanation :
Concave lens always form the virtual and erect image and the image is always diminished. Convex lens forms real image as well as virtual image. It forms both enlarged image and the diminished image.
[21] Ondometer is a -
A.
Measuring instrument for distance covered by motor wheels
B.
Measuring instrument for frequency of electromagnetic waves
C.
Device for measuring sound intensity
D.
Measuring instrument for electric power
Ans:
Measuring instrument for frequency of electromagnetic waves
Explanation :
0
[22] Specific gravity is defined as the ratio of –
A.
density of the substance to the density of water
B.
density of the substance to the density of water at 0°C
C.
density of water at 4°C to the density of the substance
D.
density of the substance to the density of water at 4°C
Ans:
density of the substance to the density of water
Explanation :
Specific gravity is the ratio of the density of a substance to the density (mass of the same unit volume) of a reference substance. The reference substance is nearly always water for liquids or air for gases.
[23] Which one of the following is responsible for the working of Newton's colour disc experiment?
A.
Formation of pure spectra
B.
Formation of impure spectra
C.
Persistence of vision
D.
Principle of complementary colour
Ans:
Persistence of vision
Explanation :
A Newton Disc can be created by painting a disc with the seven different colours. A combination of red, green and blue in the circular disc will yield the same result. This is due to the phenomenon called persistence of vision.
[24] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
The motion of an object is said to be rotatory if the particles of the object rotate in a circular path with respect to an imaginary axis, known as the axis of rotation.
[25] The first law of thermodynamics is simply the case of –
A.
Charles law
B.
Newton's law of cooling
C.
The law of heat exchange
D.
The law of conservation of energy
Ans:
The law of conservation of energy
Explanation :
The first law of thennodynamics is a version of the law of conservation of energy for thermodynamic systems. It states That the change in the internal energy of a system is equal to the heat added to the system plus the work done on the system.
Explanation :
Radio telescopes are much larger than optical telescopes because radio wavelengths are much longer than optical wavelengths. The longer wavelengths mean that the radio waves have lower energy than optical light waves.
[4] White clothes are cooler than black ones because they –
A.
absorb all the light that reaches them
B.
reflect all the light that reaches them
C.
will not allow the light to penetrate
D.
cool the sunlight completely
Ans:
reflect all the light that reaches them
Explanation :
The coolness and warmth associated with clothes is because of their reflective or absorptive capacities. White clothes are good reflectors of light, thereby keeping the body cool. The opposite is the case with black clothes.
[5] Sound is heard over longer distances on rainy days because –
A.
sound travels slowly in moist air
B.
sound travels faster in moist air
C.
moist air does not absorb sound
D.
moist air absorbs sound
Ans:
sound travels faster in moist air
Explanation :
The speed of sound in a medium is inversely proportional to the square root of its density. Higher is the humidity in the air, greater will be the velocity of sound. Therefore, the speed of sound in moist air is more than that in dry air. This is why the sirens of mills, whistle of trains and others are heard up to longer distances on a rainy day than on a dry day.
[6] Rectifiers are used to convert -
A.
Direct current to Alternating current
B.
Alternating current to Direct current
C.
high voltage to low voltage
D.
low voltage to high voltage
Ans:
Alternating current to Direct current
Explanation :
Converting DC power from one voltage to another is much more complicated. One method of DC-to-DC conversion first converts power to AC (using a device called an inverter), then uses a transformer to change the voltage, and finally rectifies power back to DC.
[7] A galvanometer can be converted to a voltmeter by connecting –
A.
a high resistance in parallel
B.
a high resistance in series
C.
a low resistance in series
D.
a low resistance in parallel
Ans:
a high resistance in series
Explanation :
In order to convert a Galvanometer into voltmeter, a very high resistance known as "series resistance" is connected in series with the galvanometer. The con-version is made for enabling the galvanometer to measure the potential difference across any component in a circuit.
[8] Copper wires are generally used for electrical power transmission instead of iron wire because –
A.
copper is cheaper than iron
B.
copper is lighter than iron
C.
copper is a better conductor of electricity than iron
D.
copper can take higher power than iron
Ans:
copper is a better conductor of electricity than iron
Explanation :
Copper is generally preferred for electrical power transmission instead of iron because of its high electrical conductivity and low resistivity.
[9] The natural environment refers to -
A.
The living organisms and non-living objects or factors in an area undisturbed by human activity
B.
The atmosphere in a forest
C.
The plants and animals in a forest
D.
The atmosphere of an area-a forest, lake or an ocean
Ans:
The living organisms and non-living objects or factors in an area undisturbed by human activity
Explanation :
[10] Rainbows are produced when sunlight -
A.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
B.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
C.
Incident on raindrops hanging in the atmosphere is dispersed after suffering reflection.
D.
None of the given statements is correct.
Ans:
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
Explanation :
When the light rays from the Sun are incident on water drops hanging in the atmosphere; these rays are dispersed into seven colours of white light and internally reflected by the drops. This dispersion and internal reflection results in production of colour arcs which appear hanging in the sky and known as rainbow.
[11] The information of brilliant colors in a thin soap film is a consequence of the phenomena of -
A.
Polarization and interference
B.
Diffraction and dispersion
C.
Multiple refraction and dispersion
D.
Multiple reflection and interference
Ans:
Multiple reflection and interference
Explanation :
Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
[12] Purpose of an optical filter is to –
A.
reflect lights of different colours
B.
dispense light into component colours
C.
refract light of different colours
D.
transmit or absorb light of different colours
Ans:
transmit or absorb light of different colours
Explanation :
Optical filters are devices that selectively transmit light in a particular range of wavelengths, that is, colors, while blocking the remainder. They are commonly used in photography (where some special effect filters are occasionally used as well as absorptive filters), fluorescence microscopy, spectroscopy, clinical chemistry, colour stage lighting, etc.
[13] Why are covalent compounds poor conductors of electricity?
A.
Due to the presence of charged particles.
B.
Due to the absence of charged particles.
C.
Due to the presence of a triple bond.
D.
None of the above
Ans:
Due to the absence of charged particles.
Explanation :
In a covalent compound, electrons are shared between atoms. This leaves no free electrons and hence there and no charged particles. This leads to covalent compounds being poor conductors of electricity.
[14] Which of the following is not correct?
A.
Ammeter measures the strength of electric current.
B.
Lactometer measures the relative density of milk.
C.
Rain gauge measures rain fall
D.
Hygrometer measures sound under water.
Ans:
Hygrometer measures sound under water.
Explanation :
A hygrometer is a weather instrument used to measure the amount of humidity in the atmosphere
[15] Which one of the following processes is responsible for the glittering of air bubble rising through water?
A.
Reflection of light
B.
Refraction of light
C.
Total internal reflection of light
D.
Scattering of light
Ans:
Total internal reflection of light
Explanation :
Total internal reflection is responsible for glittering which occurs when the light from a denser media (liquid) tries to enter less dense media (air in bubble). This reflected light when captured by our eyes is seen as glittering.
[16] Railway tracks are banked on curves so that :
A.
the train may not fall down inwards.
B.
the weight of the train may be reduced.
C.
necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track.
D.
no frictional force may be produced between the wheels and the track.
Ans:
necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track.
Explanation :
A vehicle moving at a fast speed on a straight rail/ road has a large inertia, i.e. tendency to keep moving in the same direction at the same speed. When it takes a circular turn on a curved rail/road, it experiences an additional force, termed as centripetal force, acting towards the centre of the circle.
[17] An electron microscope gives higher magnifications than an optical microscope, because –
A.
The velocity of electrons is smaller than that of light
B.
The wavelength of electrons is smaller as compared to the wavelength of visible light
C.
The electrons have more energy than the light particulars
D.
The electron microscope uses more powerful lenses
Ans:
The wavelength of electrons is smaller as compared to the wavelength of visible light
Explanation :
An electron microscope uses a beam of electrons to illuminate a specimen and produce a magnified image. An electron microscope (EM) has greater resolving power than a light-powered optical microscope because electrons have wavelengths about 100,000 times shorter than visible light photons. Magnification is the process of enlarging something only in appearance, not in physical size. This enlargement is quantified by a calculated number also called “magnification”. When this number is less than one it refers to a reduction in size, sometimes called “de-magnification”.
[18] Nichrome wire is used in an electric heater because .
A.
It has high resistance
B.
It has high melting point
C.
It can resist a current upto approx 5 amperes
D.
For all of the above reasons
Ans:
For all of the above reasons
Explanation :
Nichrome is used in electric iron because it has high resistance and it is stable in air when hot. Nichrome wire forms a protective layer of chromium oxide. Chemically it is quite stable and does not combine with other atmospheric gases even in high temperature.
[19] Out of the following pairs, which one does not have identical dimension?
A.
Moment of inertia and moment of a force
B.
Work and Torque
C.
Angular momentum and Planck's constant
D.
Impulse and Momentum
Ans:
Moment of inertia and moment of a force
Explanation :
0
[20] A concave lens always forms –
A.
a real image
B.
a virtual image
C.
an Image type which depends on object characteristics
D.
an image type which depends on lens curvature
Ans:
a virtual image
Explanation :
Concave lens always form the virtual and erect image and the image is always diminished. Convex lens forms real image as well as virtual image. It forms both enlarged image and the diminished image.
[21] Ondometer is a -
A.
Measuring instrument for distance covered by motor wheels
B.
Measuring instrument for frequency of electromagnetic waves
C.
Device for measuring sound intensity
D.
Measuring instrument for electric power
Ans:
Measuring instrument for frequency of electromagnetic waves
Explanation :
0
[22] Specific gravity is defined as the ratio of –
A.
density of the substance to the density of water
B.
density of the substance to the density of water at 0°C
C.
density of water at 4°C to the density of the substance
D.
density of the substance to the density of water at 4°C
Ans:
density of the substance to the density of water
Explanation :
Specific gravity is the ratio of the density of a substance to the density (mass of the same unit volume) of a reference substance. The reference substance is nearly always water for liquids or air for gases.
[23] Which one of the following is responsible for the working of Newton's colour disc experiment?
A.
Formation of pure spectra
B.
Formation of impure spectra
C.
Persistence of vision
D.
Principle of complementary colour
Ans:
Persistence of vision
Explanation :
A Newton Disc can be created by painting a disc with the seven different colours. A combination of red, green and blue in the circular disc will yield the same result. This is due to the phenomenon called persistence of vision.
[24] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
The motion of an object is said to be rotatory if the particles of the object rotate in a circular path with respect to an imaginary axis, known as the axis of rotation.
[25] The first law of thermodynamics is simply the case of –
A.
Charles law
B.
Newton's law of cooling
C.
The law of heat exchange
D.
The law of conservation of energy
Ans:
The law of conservation of energy
Explanation :
The first law of thennodynamics is a version of the law of conservation of energy for thermodynamic systems. It states That the change in the internal energy of a system is equal to the heat added to the system plus the work done on the system.
Explanation :
The speed of sound in a medium is inversely proportional to the square root of its density. Higher is the humidity in the air, greater will be the velocity of sound. Therefore, the speed of sound in moist air is more than that in dry air. This is why the sirens of mills, whistle of trains and others are heard up to longer distances on a rainy day than on a dry day.
[6] Rectifiers are used to convert -
A.
Direct current to Alternating current
B.
Alternating current to Direct current
C.
high voltage to low voltage
D.
low voltage to high voltage
Ans:
Alternating current to Direct current
Explanation :
Converting DC power from one voltage to another is much more complicated. One method of DC-to-DC conversion first converts power to AC (using a device called an inverter), then uses a transformer to change the voltage, and finally rectifies power back to DC.
[7] A galvanometer can be converted to a voltmeter by connecting –
A.
a high resistance in parallel
B.
a high resistance in series
C.
a low resistance in series
D.
a low resistance in parallel
Ans:
a high resistance in series
Explanation :
In order to convert a Galvanometer into voltmeter, a very high resistance known as "series resistance" is connected in series with the galvanometer. The con-version is made for enabling the galvanometer to measure the potential difference across any component in a circuit.
[8] Copper wires are generally used for electrical power transmission instead of iron wire because –
A.
copper is cheaper than iron
B.
copper is lighter than iron
C.
copper is a better conductor of electricity than iron
D.
copper can take higher power than iron
Ans:
copper is a better conductor of electricity than iron
Explanation :
Copper is generally preferred for electrical power transmission instead of iron because of its high electrical conductivity and low resistivity.
[9] The natural environment refers to -
A.
The living organisms and non-living objects or factors in an area undisturbed by human activity
B.
The atmosphere in a forest
C.
The plants and animals in a forest
D.
The atmosphere of an area-a forest, lake or an ocean
Ans:
The living organisms and non-living objects or factors in an area undisturbed by human activity
Explanation :
[10] Rainbows are produced when sunlight -
A.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
B.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
C.
Incident on raindrops hanging in the atmosphere is dispersed after suffering reflection.
D.
None of the given statements is correct.
Ans:
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
Explanation :
When the light rays from the Sun are incident on water drops hanging in the atmosphere; these rays are dispersed into seven colours of white light and internally reflected by the drops. This dispersion and internal reflection results in production of colour arcs which appear hanging in the sky and known as rainbow.
[11] The information of brilliant colors in a thin soap film is a consequence of the phenomena of -
A.
Polarization and interference
B.
Diffraction and dispersion
C.
Multiple refraction and dispersion
D.
Multiple reflection and interference
Ans:
Multiple reflection and interference
Explanation :
Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
[12] Purpose of an optical filter is to –
A.
reflect lights of different colours
B.
dispense light into component colours
C.
refract light of different colours
D.
transmit or absorb light of different colours
Ans:
transmit or absorb light of different colours
Explanation :
Optical filters are devices that selectively transmit light in a particular range of wavelengths, that is, colors, while blocking the remainder. They are commonly used in photography (where some special effect filters are occasionally used as well as absorptive filters), fluorescence microscopy, spectroscopy, clinical chemistry, colour stage lighting, etc.
[13] Why are covalent compounds poor conductors of electricity?
A.
Due to the presence of charged particles.
B.
Due to the absence of charged particles.
C.
Due to the presence of a triple bond.
D.
None of the above
Ans:
Due to the absence of charged particles.
Explanation :
In a covalent compound, electrons are shared between atoms. This leaves no free electrons and hence there and no charged particles. This leads to covalent compounds being poor conductors of electricity.
[14] Which of the following is not correct?
A.
Ammeter measures the strength of electric current.
B.
Lactometer measures the relative density of milk.
C.
Rain gauge measures rain fall
D.
Hygrometer measures sound under water.
Ans:
Hygrometer measures sound under water.
Explanation :
A hygrometer is a weather instrument used to measure the amount of humidity in the atmosphere
[15] Which one of the following processes is responsible for the glittering of air bubble rising through water?
A.
Reflection of light
B.
Refraction of light
C.
Total internal reflection of light
D.
Scattering of light
Ans:
Total internal reflection of light
Explanation :
Total internal reflection is responsible for glittering which occurs when the light from a denser media (liquid) tries to enter less dense media (air in bubble). This reflected light when captured by our eyes is seen as glittering.
[16] Railway tracks are banked on curves so that :
A.
the train may not fall down inwards.
B.
the weight of the train may be reduced.
C.
necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track.
D.
no frictional force may be produced between the wheels and the track.
Ans:
necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track.
Explanation :
A vehicle moving at a fast speed on a straight rail/ road has a large inertia, i.e. tendency to keep moving in the same direction at the same speed. When it takes a circular turn on a curved rail/road, it experiences an additional force, termed as centripetal force, acting towards the centre of the circle.
[17] An electron microscope gives higher magnifications than an optical microscope, because –
A.
The velocity of electrons is smaller than that of light
B.
The wavelength of electrons is smaller as compared to the wavelength of visible light
C.
The electrons have more energy than the light particulars
D.
The electron microscope uses more powerful lenses
Ans:
The wavelength of electrons is smaller as compared to the wavelength of visible light
Explanation :
An electron microscope uses a beam of electrons to illuminate a specimen and produce a magnified image. An electron microscope (EM) has greater resolving power than a light-powered optical microscope because electrons have wavelengths about 100,000 times shorter than visible light photons. Magnification is the process of enlarging something only in appearance, not in physical size. This enlargement is quantified by a calculated number also called “magnification”. When this number is less than one it refers to a reduction in size, sometimes called “de-magnification”.
[18] Nichrome wire is used in an electric heater because .
A.
It has high resistance
B.
It has high melting point
C.
It can resist a current upto approx 5 amperes
D.
For all of the above reasons
Ans:
For all of the above reasons
Explanation :
Nichrome is used in electric iron because it has high resistance and it is stable in air when hot. Nichrome wire forms a protective layer of chromium oxide. Chemically it is quite stable and does not combine with other atmospheric gases even in high temperature.
[19] Out of the following pairs, which one does not have identical dimension?
A.
Moment of inertia and moment of a force
B.
Work and Torque
C.
Angular momentum and Planck's constant
D.
Impulse and Momentum
Ans:
Moment of inertia and moment of a force
Explanation :
0
[20] A concave lens always forms –
A.
a real image
B.
a virtual image
C.
an Image type which depends on object characteristics
D.
an image type which depends on lens curvature
Ans:
a virtual image
Explanation :
Concave lens always form the virtual and erect image and the image is always diminished. Convex lens forms real image as well as virtual image. It forms both enlarged image and the diminished image.
[21] Ondometer is a -
A.
Measuring instrument for distance covered by motor wheels
B.
Measuring instrument for frequency of electromagnetic waves
C.
Device for measuring sound intensity
D.
Measuring instrument for electric power
Ans:
Measuring instrument for frequency of electromagnetic waves
Explanation :
0
[22] Specific gravity is defined as the ratio of –
A.
density of the substance to the density of water
B.
density of the substance to the density of water at 0°C
C.
density of water at 4°C to the density of the substance
D.
density of the substance to the density of water at 4°C
Ans:
density of the substance to the density of water
Explanation :
Specific gravity is the ratio of the density of a substance to the density (mass of the same unit volume) of a reference substance. The reference substance is nearly always water for liquids or air for gases.
[23] Which one of the following is responsible for the working of Newton's colour disc experiment?
A.
Formation of pure spectra
B.
Formation of impure spectra
C.
Persistence of vision
D.
Principle of complementary colour
Ans:
Persistence of vision
Explanation :
A Newton Disc can be created by painting a disc with the seven different colours. A combination of red, green and blue in the circular disc will yield the same result. This is due to the phenomenon called persistence of vision.
[24] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
The motion of an object is said to be rotatory if the particles of the object rotate in a circular path with respect to an imaginary axis, known as the axis of rotation.
[25] The first law of thermodynamics is simply the case of –
A.
Charles law
B.
Newton's law of cooling
C.
The law of heat exchange
D.
The law of conservation of energy
Ans:
The law of conservation of energy
Explanation :
The first law of thennodynamics is a version of the law of conservation of energy for thermodynamic systems. It states That the change in the internal energy of a system is equal to the heat added to the system plus the work done on the system.
Explanation :
In order to convert a Galvanometer into voltmeter, a very high resistance known as "series resistance" is connected in series with the galvanometer. The con-version is made for enabling the galvanometer to measure the potential difference across any component in a circuit.
[8] Copper wires are generally used for electrical power transmission instead of iron wire because –
A.
copper is cheaper than iron
B.
copper is lighter than iron
C.
copper is a better conductor of electricity than iron
D.
copper can take higher power than iron
Ans:
copper is a better conductor of electricity than iron
Explanation :
Copper is generally preferred for electrical power transmission instead of iron because of its high electrical conductivity and low resistivity.
[9] The natural environment refers to -
A.
The living organisms and non-living objects or factors in an area undisturbed by human activity
B.
The atmosphere in a forest
C.
The plants and animals in a forest
D.
The atmosphere of an area-a forest, lake or an ocean
Ans:
The living organisms and non-living objects or factors in an area undisturbed by human activity
Explanation :
[10] Rainbows are produced when sunlight -
A.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
B.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
C.
Incident on raindrops hanging in the atmosphere is dispersed after suffering reflection.
D.
None of the given statements is correct.
Ans:
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
Explanation :
When the light rays from the Sun are incident on water drops hanging in the atmosphere; these rays are dispersed into seven colours of white light and internally reflected by the drops. This dispersion and internal reflection results in production of colour arcs which appear hanging in the sky and known as rainbow.
[11] The information of brilliant colors in a thin soap film is a consequence of the phenomena of -
A.
Polarization and interference
B.
Diffraction and dispersion
C.
Multiple refraction and dispersion
D.
Multiple reflection and interference
Ans:
Multiple reflection and interference
Explanation :
Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
[12] Purpose of an optical filter is to –
A.
reflect lights of different colours
B.
dispense light into component colours
C.
refract light of different colours
D.
transmit or absorb light of different colours
Ans:
transmit or absorb light of different colours
Explanation :
Optical filters are devices that selectively transmit light in a particular range of wavelengths, that is, colors, while blocking the remainder. They are commonly used in photography (where some special effect filters are occasionally used as well as absorptive filters), fluorescence microscopy, spectroscopy, clinical chemistry, colour stage lighting, etc.
[13] Why are covalent compounds poor conductors of electricity?
A.
Due to the presence of charged particles.
B.
Due to the absence of charged particles.
C.
Due to the presence of a triple bond.
D.
None of the above
Ans:
Due to the absence of charged particles.
Explanation :
In a covalent compound, electrons are shared between atoms. This leaves no free electrons and hence there and no charged particles. This leads to covalent compounds being poor conductors of electricity.
[14] Which of the following is not correct?
A.
Ammeter measures the strength of electric current.
B.
Lactometer measures the relative density of milk.
C.
Rain gauge measures rain fall
D.
Hygrometer measures sound under water.
Ans:
Hygrometer measures sound under water.
Explanation :
A hygrometer is a weather instrument used to measure the amount of humidity in the atmosphere
[15] Which one of the following processes is responsible for the glittering of air bubble rising through water?
A.
Reflection of light
B.
Refraction of light
C.
Total internal reflection of light
D.
Scattering of light
Ans:
Total internal reflection of light
Explanation :
Total internal reflection is responsible for glittering which occurs when the light from a denser media (liquid) tries to enter less dense media (air in bubble). This reflected light when captured by our eyes is seen as glittering.
[16] Railway tracks are banked on curves so that :
A.
the train may not fall down inwards.
B.
the weight of the train may be reduced.
C.
necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track.
D.
no frictional force may be produced between the wheels and the track.
Ans:
necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track.
Explanation :
A vehicle moving at a fast speed on a straight rail/ road has a large inertia, i.e. tendency to keep moving in the same direction at the same speed. When it takes a circular turn on a curved rail/road, it experiences an additional force, termed as centripetal force, acting towards the centre of the circle.
[17] An electron microscope gives higher magnifications than an optical microscope, because –
A.
The velocity of electrons is smaller than that of light
B.
The wavelength of electrons is smaller as compared to the wavelength of visible light
C.
The electrons have more energy than the light particulars
D.
The electron microscope uses more powerful lenses
Ans:
The wavelength of electrons is smaller as compared to the wavelength of visible light
Explanation :
An electron microscope uses a beam of electrons to illuminate a specimen and produce a magnified image. An electron microscope (EM) has greater resolving power than a light-powered optical microscope because electrons have wavelengths about 100,000 times shorter than visible light photons. Magnification is the process of enlarging something only in appearance, not in physical size. This enlargement is quantified by a calculated number also called “magnification”. When this number is less than one it refers to a reduction in size, sometimes called “de-magnification”.
[18] Nichrome wire is used in an electric heater because .
A.
It has high resistance
B.
It has high melting point
C.
It can resist a current upto approx 5 amperes
D.
For all of the above reasons
Ans:
For all of the above reasons
Explanation :
Nichrome is used in electric iron because it has high resistance and it is stable in air when hot. Nichrome wire forms a protective layer of chromium oxide. Chemically it is quite stable and does not combine with other atmospheric gases even in high temperature.
[19] Out of the following pairs, which one does not have identical dimension?
A.
Moment of inertia and moment of a force
B.
Work and Torque
C.
Angular momentum and Planck's constant
D.
Impulse and Momentum
Ans:
Moment of inertia and moment of a force
Explanation :
0
[20] A concave lens always forms –
A.
a real image
B.
a virtual image
C.
an Image type which depends on object characteristics
D.
an image type which depends on lens curvature
Ans:
a virtual image
Explanation :
Concave lens always form the virtual and erect image and the image is always diminished. Convex lens forms real image as well as virtual image. It forms both enlarged image and the diminished image.
[21] Ondometer is a -
A.
Measuring instrument for distance covered by motor wheels
B.
Measuring instrument for frequency of electromagnetic waves
C.
Device for measuring sound intensity
D.
Measuring instrument for electric power
Ans:
Measuring instrument for frequency of electromagnetic waves
Explanation :
0
[22] Specific gravity is defined as the ratio of –
A.
density of the substance to the density of water
B.
density of the substance to the density of water at 0°C
C.
density of water at 4°C to the density of the substance
D.
density of the substance to the density of water at 4°C
Ans:
density of the substance to the density of water
Explanation :
Specific gravity is the ratio of the density of a substance to the density (mass of the same unit volume) of a reference substance. The reference substance is nearly always water for liquids or air for gases.
[23] Which one of the following is responsible for the working of Newton's colour disc experiment?
A.
Formation of pure spectra
B.
Formation of impure spectra
C.
Persistence of vision
D.
Principle of complementary colour
Ans:
Persistence of vision
Explanation :
A Newton Disc can be created by painting a disc with the seven different colours. A combination of red, green and blue in the circular disc will yield the same result. This is due to the phenomenon called persistence of vision.
[24] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
The motion of an object is said to be rotatory if the particles of the object rotate in a circular path with respect to an imaginary axis, known as the axis of rotation.
[25] The first law of thermodynamics is simply the case of –
A.
Charles law
B.
Newton's law of cooling
C.
The law of heat exchange
D.
The law of conservation of energy
Ans:
The law of conservation of energy
Explanation :
The first law of thennodynamics is a version of the law of conservation of energy for thermodynamic systems. It states That the change in the internal energy of a system is equal to the heat added to the system plus the work done on the system.
Explanation :
[10] Rainbows are produced when sunlight -
A.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
B.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
C.
Incident on raindrops hanging in the atmosphere is dispersed after suffering reflection.
D.
None of the given statements is correct.
Ans:
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
Explanation :
When the light rays from the Sun are incident on water drops hanging in the atmosphere; these rays are dispersed into seven colours of white light and internally reflected by the drops. This dispersion and internal reflection results in production of colour arcs which appear hanging in the sky and known as rainbow.
[11] The information of brilliant colors in a thin soap film is a consequence of the phenomena of -
A.
Polarization and interference
B.
Diffraction and dispersion
C.
Multiple refraction and dispersion
D.
Multiple reflection and interference
Ans:
Multiple reflection and interference
Explanation :
Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
[12] Purpose of an optical filter is to –
A.
reflect lights of different colours
B.
dispense light into component colours
C.
refract light of different colours
D.
transmit or absorb light of different colours
Ans:
transmit or absorb light of different colours
Explanation :
Optical filters are devices that selectively transmit light in a particular range of wavelengths, that is, colors, while blocking the remainder. They are commonly used in photography (where some special effect filters are occasionally used as well as absorptive filters), fluorescence microscopy, spectroscopy, clinical chemistry, colour stage lighting, etc.
[13] Why are covalent compounds poor conductors of electricity?
A.
Due to the presence of charged particles.
B.
Due to the absence of charged particles.
C.
Due to the presence of a triple bond.
D.
None of the above
Ans:
Due to the absence of charged particles.
Explanation :
In a covalent compound, electrons are shared between atoms. This leaves no free electrons and hence there and no charged particles. This leads to covalent compounds being poor conductors of electricity.
[14] Which of the following is not correct?
A.
Ammeter measures the strength of electric current.
B.
Lactometer measures the relative density of milk.
C.
Rain gauge measures rain fall
D.
Hygrometer measures sound under water.
Ans:
Hygrometer measures sound under water.
Explanation :
A hygrometer is a weather instrument used to measure the amount of humidity in the atmosphere
[15] Which one of the following processes is responsible for the glittering of air bubble rising through water?
A.
Reflection of light
B.
Refraction of light
C.
Total internal reflection of light
D.
Scattering of light
Ans:
Total internal reflection of light
Explanation :
Total internal reflection is responsible for glittering which occurs when the light from a denser media (liquid) tries to enter less dense media (air in bubble). This reflected light when captured by our eyes is seen as glittering.
[16] Railway tracks are banked on curves so that :
A.
the train may not fall down inwards.
B.
the weight of the train may be reduced.
C.
necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track.
D.
no frictional force may be produced between the wheels and the track.
Ans:
necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track.
Explanation :
A vehicle moving at a fast speed on a straight rail/ road has a large inertia, i.e. tendency to keep moving in the same direction at the same speed. When it takes a circular turn on a curved rail/road, it experiences an additional force, termed as centripetal force, acting towards the centre of the circle.
[17] An electron microscope gives higher magnifications than an optical microscope, because –
A.
The velocity of electrons is smaller than that of light
B.
The wavelength of electrons is smaller as compared to the wavelength of visible light
C.
The electrons have more energy than the light particulars
D.
The electron microscope uses more powerful lenses
Ans:
The wavelength of electrons is smaller as compared to the wavelength of visible light
Explanation :
An electron microscope uses a beam of electrons to illuminate a specimen and produce a magnified image. An electron microscope (EM) has greater resolving power than a light-powered optical microscope because electrons have wavelengths about 100,000 times shorter than visible light photons. Magnification is the process of enlarging something only in appearance, not in physical size. This enlargement is quantified by a calculated number also called “magnification”. When this number is less than one it refers to a reduction in size, sometimes called “de-magnification”.
[18] Nichrome wire is used in an electric heater because .
A.
It has high resistance
B.
It has high melting point
C.
It can resist a current upto approx 5 amperes
D.
For all of the above reasons
Ans:
For all of the above reasons
Explanation :
Nichrome is used in electric iron because it has high resistance and it is stable in air when hot. Nichrome wire forms a protective layer of chromium oxide. Chemically it is quite stable and does not combine with other atmospheric gases even in high temperature.
[19] Out of the following pairs, which one does not have identical dimension?
A.
Moment of inertia and moment of a force
B.
Work and Torque
C.
Angular momentum and Planck's constant
D.
Impulse and Momentum
Ans:
Moment of inertia and moment of a force
Explanation :
0
[20] A concave lens always forms –
A.
a real image
B.
a virtual image
C.
an Image type which depends on object characteristics
D.
an image type which depends on lens curvature
Ans:
a virtual image
Explanation :
Concave lens always form the virtual and erect image and the image is always diminished. Convex lens forms real image as well as virtual image. It forms both enlarged image and the diminished image.
[21] Ondometer is a -
A.
Measuring instrument for distance covered by motor wheels
B.
Measuring instrument for frequency of electromagnetic waves
C.
Device for measuring sound intensity
D.
Measuring instrument for electric power
Ans:
Measuring instrument for frequency of electromagnetic waves
Explanation :
0
[22] Specific gravity is defined as the ratio of –
A.
density of the substance to the density of water
B.
density of the substance to the density of water at 0°C
C.
density of water at 4°C to the density of the substance
D.
density of the substance to the density of water at 4°C
Ans:
density of the substance to the density of water
Explanation :
Specific gravity is the ratio of the density of a substance to the density (mass of the same unit volume) of a reference substance. The reference substance is nearly always water for liquids or air for gases.
[23] Which one of the following is responsible for the working of Newton's colour disc experiment?
A.
Formation of pure spectra
B.
Formation of impure spectra
C.
Persistence of vision
D.
Principle of complementary colour
Ans:
Persistence of vision
Explanation :
A Newton Disc can be created by painting a disc with the seven different colours. A combination of red, green and blue in the circular disc will yield the same result. This is due to the phenomenon called persistence of vision.
[24] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
The motion of an object is said to be rotatory if the particles of the object rotate in a circular path with respect to an imaginary axis, known as the axis of rotation.
[25] The first law of thermodynamics is simply the case of –
A.
Charles law
B.
Newton's law of cooling
C.
The law of heat exchange
D.
The law of conservation of energy
Ans:
The law of conservation of energy
Explanation :
The first law of thennodynamics is a version of the law of conservation of energy for thermodynamic systems. It states That the change in the internal energy of a system is equal to the heat added to the system plus the work done on the system.
Explanation :
Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
[12] Purpose of an optical filter is to –
A.
reflect lights of different colours
B.
dispense light into component colours
C.
refract light of different colours
D.
transmit or absorb light of different colours
Ans:
transmit or absorb light of different colours
Explanation :
Optical filters are devices that selectively transmit light in a particular range of wavelengths, that is, colors, while blocking the remainder. They are commonly used in photography (where some special effect filters are occasionally used as well as absorptive filters), fluorescence microscopy, spectroscopy, clinical chemistry, colour stage lighting, etc.
[13] Why are covalent compounds poor conductors of electricity?
A.
Due to the presence of charged particles.
B.
Due to the absence of charged particles.
C.
Due to the presence of a triple bond.
D.
None of the above
Ans:
Due to the absence of charged particles.
Explanation :
In a covalent compound, electrons are shared between atoms. This leaves no free electrons and hence there and no charged particles. This leads to covalent compounds being poor conductors of electricity.
[14] Which of the following is not correct?
A.
Ammeter measures the strength of electric current.
B.
Lactometer measures the relative density of milk.
C.
Rain gauge measures rain fall
D.
Hygrometer measures sound under water.
Ans:
Hygrometer measures sound under water.
Explanation :
A hygrometer is a weather instrument used to measure the amount of humidity in the atmosphere
[15] Which one of the following processes is responsible for the glittering of air bubble rising through water?
A.
Reflection of light
B.
Refraction of light
C.
Total internal reflection of light
D.
Scattering of light
Ans:
Total internal reflection of light
Explanation :
Total internal reflection is responsible for glittering which occurs when the light from a denser media (liquid) tries to enter less dense media (air in bubble). This reflected light when captured by our eyes is seen as glittering.
[16] Railway tracks are banked on curves so that :
A.
the train may not fall down inwards.
B.
the weight of the train may be reduced.
C.
necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track.
D.
no frictional force may be produced between the wheels and the track.
Ans:
necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track.
Explanation :
A vehicle moving at a fast speed on a straight rail/ road has a large inertia, i.e. tendency to keep moving in the same direction at the same speed. When it takes a circular turn on a curved rail/road, it experiences an additional force, termed as centripetal force, acting towards the centre of the circle.
[17] An electron microscope gives higher magnifications than an optical microscope, because –
A.
The velocity of electrons is smaller than that of light
B.
The wavelength of electrons is smaller as compared to the wavelength of visible light
C.
The electrons have more energy than the light particulars
D.
The electron microscope uses more powerful lenses
Ans:
The wavelength of electrons is smaller as compared to the wavelength of visible light
Explanation :
An electron microscope uses a beam of electrons to illuminate a specimen and produce a magnified image. An electron microscope (EM) has greater resolving power than a light-powered optical microscope because electrons have wavelengths about 100,000 times shorter than visible light photons. Magnification is the process of enlarging something only in appearance, not in physical size. This enlargement is quantified by a calculated number also called “magnification”. When this number is less than one it refers to a reduction in size, sometimes called “de-magnification”.
[18] Nichrome wire is used in an electric heater because .
A.
It has high resistance
B.
It has high melting point
C.
It can resist a current upto approx 5 amperes
D.
For all of the above reasons
Ans:
For all of the above reasons
Explanation :
Nichrome is used in electric iron because it has high resistance and it is stable in air when hot. Nichrome wire forms a protective layer of chromium oxide. Chemically it is quite stable and does not combine with other atmospheric gases even in high temperature.
[19] Out of the following pairs, which one does not have identical dimension?
A.
Moment of inertia and moment of a force
B.
Work and Torque
C.
Angular momentum and Planck's constant
D.
Impulse and Momentum
Ans:
Moment of inertia and moment of a force
Explanation :
0
[20] A concave lens always forms –
A.
a real image
B.
a virtual image
C.
an Image type which depends on object characteristics
D.
an image type which depends on lens curvature
Ans:
a virtual image
Explanation :
Concave lens always form the virtual and erect image and the image is always diminished. Convex lens forms real image as well as virtual image. It forms both enlarged image and the diminished image.
[21] Ondometer is a -
A.
Measuring instrument for distance covered by motor wheels
B.
Measuring instrument for frequency of electromagnetic waves
C.
Device for measuring sound intensity
D.
Measuring instrument for electric power
Ans:
Measuring instrument for frequency of electromagnetic waves
Explanation :
0
[22] Specific gravity is defined as the ratio of –
A.
density of the substance to the density of water
B.
density of the substance to the density of water at 0°C
C.
density of water at 4°C to the density of the substance
D.
density of the substance to the density of water at 4°C
Ans:
density of the substance to the density of water
Explanation :
Specific gravity is the ratio of the density of a substance to the density (mass of the same unit volume) of a reference substance. The reference substance is nearly always water for liquids or air for gases.
[23] Which one of the following is responsible for the working of Newton's colour disc experiment?
A.
Formation of pure spectra
B.
Formation of impure spectra
C.
Persistence of vision
D.
Principle of complementary colour
Ans:
Persistence of vision
Explanation :
A Newton Disc can be created by painting a disc with the seven different colours. A combination of red, green and blue in the circular disc will yield the same result. This is due to the phenomenon called persistence of vision.
[24] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
The motion of an object is said to be rotatory if the particles of the object rotate in a circular path with respect to an imaginary axis, known as the axis of rotation.
[25] The first law of thermodynamics is simply the case of –
A.
Charles law
B.
Newton's law of cooling
C.
The law of heat exchange
D.
The law of conservation of energy
Ans:
The law of conservation of energy
Explanation :
The first law of thennodynamics is a version of the law of conservation of energy for thermodynamic systems. It states That the change in the internal energy of a system is equal to the heat added to the system plus the work done on the system.
Explanation :
In a covalent compound, electrons are shared between atoms. This leaves no free electrons and hence there and no charged particles. This leads to covalent compounds being poor conductors of electricity.
[14] Which of the following is not correct?
A.
Ammeter measures the strength of electric current.
B.
Lactometer measures the relative density of milk.
C.
Rain gauge measures rain fall
D.
Hygrometer measures sound under water.
Ans:
Hygrometer measures sound under water.
Explanation :
A hygrometer is a weather instrument used to measure the amount of humidity in the atmosphere
[15] Which one of the following processes is responsible for the glittering of air bubble rising through water?
A.
Reflection of light
B.
Refraction of light
C.
Total internal reflection of light
D.
Scattering of light
Ans:
Total internal reflection of light
Explanation :
Total internal reflection is responsible for glittering which occurs when the light from a denser media (liquid) tries to enter less dense media (air in bubble). This reflected light when captured by our eyes is seen as glittering.
[16] Railway tracks are banked on curves so that :
A.
the train may not fall down inwards.
B.
the weight of the train may be reduced.
C.
necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track.
D.
no frictional force may be produced between the wheels and the track.
Ans:
necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track.
Explanation :
A vehicle moving at a fast speed on a straight rail/ road has a large inertia, i.e. tendency to keep moving in the same direction at the same speed. When it takes a circular turn on a curved rail/road, it experiences an additional force, termed as centripetal force, acting towards the centre of the circle.
[17] An electron microscope gives higher magnifications than an optical microscope, because –
A.
The velocity of electrons is smaller than that of light
B.
The wavelength of electrons is smaller as compared to the wavelength of visible light
C.
The electrons have more energy than the light particulars
D.
The electron microscope uses more powerful lenses
Ans:
The wavelength of electrons is smaller as compared to the wavelength of visible light
Explanation :
An electron microscope uses a beam of electrons to illuminate a specimen and produce a magnified image. An electron microscope (EM) has greater resolving power than a light-powered optical microscope because electrons have wavelengths about 100,000 times shorter than visible light photons. Magnification is the process of enlarging something only in appearance, not in physical size. This enlargement is quantified by a calculated number also called “magnification”. When this number is less than one it refers to a reduction in size, sometimes called “de-magnification”.
[18] Nichrome wire is used in an electric heater because .
A.
It has high resistance
B.
It has high melting point
C.
It can resist a current upto approx 5 amperes
D.
For all of the above reasons
Ans:
For all of the above reasons
Explanation :
Nichrome is used in electric iron because it has high resistance and it is stable in air when hot. Nichrome wire forms a protective layer of chromium oxide. Chemically it is quite stable and does not combine with other atmospheric gases even in high temperature.
[19] Out of the following pairs, which one does not have identical dimension?
A.
Moment of inertia and moment of a force
B.
Work and Torque
C.
Angular momentum and Planck's constant
D.
Impulse and Momentum
Ans:
Moment of inertia and moment of a force
Explanation :
0
[20] A concave lens always forms –
A.
a real image
B.
a virtual image
C.
an Image type which depends on object characteristics
D.
an image type which depends on lens curvature
Ans:
a virtual image
Explanation :
Concave lens always form the virtual and erect image and the image is always diminished. Convex lens forms real image as well as virtual image. It forms both enlarged image and the diminished image.
[21] Ondometer is a -
A.
Measuring instrument for distance covered by motor wheels
B.
Measuring instrument for frequency of electromagnetic waves
C.
Device for measuring sound intensity
D.
Measuring instrument for electric power
Ans:
Measuring instrument for frequency of electromagnetic waves
Explanation :
0
[22] Specific gravity is defined as the ratio of –
A.
density of the substance to the density of water
B.
density of the substance to the density of water at 0°C
C.
density of water at 4°C to the density of the substance
D.
density of the substance to the density of water at 4°C
Ans:
density of the substance to the density of water
Explanation :
Specific gravity is the ratio of the density of a substance to the density (mass of the same unit volume) of a reference substance. The reference substance is nearly always water for liquids or air for gases.
[23] Which one of the following is responsible for the working of Newton's colour disc experiment?
A.
Formation of pure spectra
B.
Formation of impure spectra
C.
Persistence of vision
D.
Principle of complementary colour
Ans:
Persistence of vision
Explanation :
A Newton Disc can be created by painting a disc with the seven different colours. A combination of red, green and blue in the circular disc will yield the same result. This is due to the phenomenon called persistence of vision.
[24] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
The motion of an object is said to be rotatory if the particles of the object rotate in a circular path with respect to an imaginary axis, known as the axis of rotation.
[25] The first law of thermodynamics is simply the case of –
A.
Charles law
B.
Newton's law of cooling
C.
The law of heat exchange
D.
The law of conservation of energy
Ans:
The law of conservation of energy
Explanation :
The first law of thennodynamics is a version of the law of conservation of energy for thermodynamic systems. It states That the change in the internal energy of a system is equal to the heat added to the system plus the work done on the system.
Explanation :
Total internal reflection is responsible for glittering which occurs when the light from a denser media (liquid) tries to enter less dense media (air in bubble). This reflected light when captured by our eyes is seen as glittering.
[16] Railway tracks are banked on curves so that :
A.
the train may not fall down inwards.
B.
the weight of the train may be reduced.
C.
necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track.
D.
no frictional force may be produced between the wheels and the track.
Ans:
necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track.
Explanation :
A vehicle moving at a fast speed on a straight rail/ road has a large inertia, i.e. tendency to keep moving in the same direction at the same speed. When it takes a circular turn on a curved rail/road, it experiences an additional force, termed as centripetal force, acting towards the centre of the circle.
[17] An electron microscope gives higher magnifications than an optical microscope, because –
A.
The velocity of electrons is smaller than that of light
B.
The wavelength of electrons is smaller as compared to the wavelength of visible light
C.
The electrons have more energy than the light particulars
D.
The electron microscope uses more powerful lenses
Ans:
The wavelength of electrons is smaller as compared to the wavelength of visible light
Explanation :
An electron microscope uses a beam of electrons to illuminate a specimen and produce a magnified image. An electron microscope (EM) has greater resolving power than a light-powered optical microscope because electrons have wavelengths about 100,000 times shorter than visible light photons. Magnification is the process of enlarging something only in appearance, not in physical size. This enlargement is quantified by a calculated number also called “magnification”. When this number is less than one it refers to a reduction in size, sometimes called “de-magnification”.
[18] Nichrome wire is used in an electric heater because .
A.
It has high resistance
B.
It has high melting point
C.
It can resist a current upto approx 5 amperes
D.
For all of the above reasons
Ans:
For all of the above reasons
Explanation :
Nichrome is used in electric iron because it has high resistance and it is stable in air when hot. Nichrome wire forms a protective layer of chromium oxide. Chemically it is quite stable and does not combine with other atmospheric gases even in high temperature.
[19] Out of the following pairs, which one does not have identical dimension?
A.
Moment of inertia and moment of a force
B.
Work and Torque
C.
Angular momentum and Planck's constant
D.
Impulse and Momentum
Ans:
Moment of inertia and moment of a force
Explanation :
0
[20] A concave lens always forms –
A.
a real image
B.
a virtual image
C.
an Image type which depends on object characteristics
D.
an image type which depends on lens curvature
Ans:
a virtual image
Explanation :
Concave lens always form the virtual and erect image and the image is always diminished. Convex lens forms real image as well as virtual image. It forms both enlarged image and the diminished image.
[21] Ondometer is a -
A.
Measuring instrument for distance covered by motor wheels
B.
Measuring instrument for frequency of electromagnetic waves
C.
Device for measuring sound intensity
D.
Measuring instrument for electric power
Ans:
Measuring instrument for frequency of electromagnetic waves
Explanation :
0
[22] Specific gravity is defined as the ratio of –
A.
density of the substance to the density of water
B.
density of the substance to the density of water at 0°C
C.
density of water at 4°C to the density of the substance
D.
density of the substance to the density of water at 4°C
Ans:
density of the substance to the density of water
Explanation :
Specific gravity is the ratio of the density of a substance to the density (mass of the same unit volume) of a reference substance. The reference substance is nearly always water for liquids or air for gases.
[23] Which one of the following is responsible for the working of Newton's colour disc experiment?
A.
Formation of pure spectra
B.
Formation of impure spectra
C.
Persistence of vision
D.
Principle of complementary colour
Ans:
Persistence of vision
Explanation :
A Newton Disc can be created by painting a disc with the seven different colours. A combination of red, green and blue in the circular disc will yield the same result. This is due to the phenomenon called persistence of vision.
[24] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
The motion of an object is said to be rotatory if the particles of the object rotate in a circular path with respect to an imaginary axis, known as the axis of rotation.
[25] The first law of thermodynamics is simply the case of –
A.
Charles law
B.
Newton's law of cooling
C.
The law of heat exchange
D.
The law of conservation of energy
Ans:
The law of conservation of energy
Explanation :
The first law of thennodynamics is a version of the law of conservation of energy for thermodynamic systems. It states That the change in the internal energy of a system is equal to the heat added to the system plus the work done on the system.
Explanation :
An electron microscope uses a beam of electrons to illuminate a specimen and produce a magnified image. An electron microscope (EM) has greater resolving power than a light-powered optical microscope because electrons have wavelengths about 100,000 times shorter than visible light photons. Magnification is the process of enlarging something only in appearance, not in physical size. This enlargement is quantified by a calculated number also called “magnification”. When this number is less than one it refers to a reduction in size, sometimes called “de-magnification”.
[18] Nichrome wire is used in an electric heater because .
A.
It has high resistance
B.
It has high melting point
C.
It can resist a current upto approx 5 amperes
D.
For all of the above reasons
Ans:
For all of the above reasons
Explanation :
Nichrome is used in electric iron because it has high resistance and it is stable in air when hot. Nichrome wire forms a protective layer of chromium oxide. Chemically it is quite stable and does not combine with other atmospheric gases even in high temperature.
[19] Out of the following pairs, which one does not have identical dimension?
A.
Moment of inertia and moment of a force
B.
Work and Torque
C.
Angular momentum and Planck's constant
D.
Impulse and Momentum
Ans:
Moment of inertia and moment of a force
Explanation :
0
[20] A concave lens always forms –
A.
a real image
B.
a virtual image
C.
an Image type which depends on object characteristics
D.
an image type which depends on lens curvature
Ans:
a virtual image
Explanation :
Concave lens always form the virtual and erect image and the image is always diminished. Convex lens forms real image as well as virtual image. It forms both enlarged image and the diminished image.
[21] Ondometer is a -
A.
Measuring instrument for distance covered by motor wheels
B.
Measuring instrument for frequency of electromagnetic waves
C.
Device for measuring sound intensity
D.
Measuring instrument for electric power
Ans:
Measuring instrument for frequency of electromagnetic waves
Explanation :
0
[22] Specific gravity is defined as the ratio of –
A.
density of the substance to the density of water
B.
density of the substance to the density of water at 0°C
C.
density of water at 4°C to the density of the substance
D.
density of the substance to the density of water at 4°C
Ans:
density of the substance to the density of water
Explanation :
Specific gravity is the ratio of the density of a substance to the density (mass of the same unit volume) of a reference substance. The reference substance is nearly always water for liquids or air for gases.
[23] Which one of the following is responsible for the working of Newton's colour disc experiment?
A.
Formation of pure spectra
B.
Formation of impure spectra
C.
Persistence of vision
D.
Principle of complementary colour
Ans:
Persistence of vision
Explanation :
A Newton Disc can be created by painting a disc with the seven different colours. A combination of red, green and blue in the circular disc will yield the same result. This is due to the phenomenon called persistence of vision.
[24] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
The motion of an object is said to be rotatory if the particles of the object rotate in a circular path with respect to an imaginary axis, known as the axis of rotation.
[25] The first law of thermodynamics is simply the case of –
A.
Charles law
B.
Newton's law of cooling
C.
The law of heat exchange
D.
The law of conservation of energy
Ans:
The law of conservation of energy
Explanation :
The first law of thennodynamics is a version of the law of conservation of energy for thermodynamic systems. It states That the change in the internal energy of a system is equal to the heat added to the system plus the work done on the system.
Explanation :
0
[20] A concave lens always forms –
A.
a real image
B.
a virtual image
C.
an Image type which depends on object characteristics
D.
an image type which depends on lens curvature
Ans:
a virtual image
Explanation :
Concave lens always form the virtual and erect image and the image is always diminished. Convex lens forms real image as well as virtual image. It forms both enlarged image and the diminished image.
[21] Ondometer is a -
A.
Measuring instrument for distance covered by motor wheels
B.
Measuring instrument for frequency of electromagnetic waves
C.
Device for measuring sound intensity
D.
Measuring instrument for electric power
Ans:
Measuring instrument for frequency of electromagnetic waves
Explanation :
0
[22] Specific gravity is defined as the ratio of –
A.
density of the substance to the density of water
B.
density of the substance to the density of water at 0°C
C.
density of water at 4°C to the density of the substance
D.
density of the substance to the density of water at 4°C
Ans:
density of the substance to the density of water
Explanation :
Specific gravity is the ratio of the density of a substance to the density (mass of the same unit volume) of a reference substance. The reference substance is nearly always water for liquids or air for gases.
[23] Which one of the following is responsible for the working of Newton's colour disc experiment?
A.
Formation of pure spectra
B.
Formation of impure spectra
C.
Persistence of vision
D.
Principle of complementary colour
Ans:
Persistence of vision
Explanation :
A Newton Disc can be created by painting a disc with the seven different colours. A combination of red, green and blue in the circular disc will yield the same result. This is due to the phenomenon called persistence of vision.
[24] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
The motion of an object is said to be rotatory if the particles of the object rotate in a circular path with respect to an imaginary axis, known as the axis of rotation.
[25] The first law of thermodynamics is simply the case of –
A.
Charles law
B.
Newton's law of cooling
C.
The law of heat exchange
D.
The law of conservation of energy
Ans:
The law of conservation of energy
Explanation :
The first law of thennodynamics is a version of the law of conservation of energy for thermodynamic systems. It states That the change in the internal energy of a system is equal to the heat added to the system plus the work done on the system.
Explanation :
0
[22] Specific gravity is defined as the ratio of –
A.
density of the substance to the density of water
B.
density of the substance to the density of water at 0°C
C.
density of water at 4°C to the density of the substance
D.
density of the substance to the density of water at 4°C
Ans:
density of the substance to the density of water
Explanation :
Specific gravity is the ratio of the density of a substance to the density (mass of the same unit volume) of a reference substance. The reference substance is nearly always water for liquids or air for gases.
[23] Which one of the following is responsible for the working of Newton's colour disc experiment?
A.
Formation of pure spectra
B.
Formation of impure spectra
C.
Persistence of vision
D.
Principle of complementary colour
Ans:
Persistence of vision
Explanation :
A Newton Disc can be created by painting a disc with the seven different colours. A combination of red, green and blue in the circular disc will yield the same result. This is due to the phenomenon called persistence of vision.
[24] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
The motion of an object is said to be rotatory if the particles of the object rotate in a circular path with respect to an imaginary axis, known as the axis of rotation.
[25] The first law of thermodynamics is simply the case of –
A.
Charles law
B.
Newton's law of cooling
C.
The law of heat exchange
D.
The law of conservation of energy
Ans:
The law of conservation of energy
Explanation :
The first law of thennodynamics is a version of the law of conservation of energy for thermodynamic systems. It states That the change in the internal energy of a system is equal to the heat added to the system plus the work done on the system.
Explanation :
A Newton Disc can be created by painting a disc with the seven different colours. A combination of red, green and blue in the circular disc will yield the same result. This is due to the phenomenon called persistence of vision.
[24] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
The motion of an object is said to be rotatory if the particles of the object rotate in a circular path with respect to an imaginary axis, known as the axis of rotation.
[25] The first law of thermodynamics is simply the case of –
A.
Charles law
B.
Newton's law of cooling
C.
The law of heat exchange
D.
The law of conservation of energy
Ans:
The law of conservation of energy
Explanation :
The first law of thennodynamics is a version of the law of conservation of energy for thermodynamic systems. It states That the change in the internal energy of a system is equal to the heat added to the system plus the work done on the system.
Explanation :
The first law of thennodynamics is a version of the law of conservation of energy for thermodynamic systems. It states That the change in the internal energy of a system is equal to the heat added to the system plus the work done on the system.