[1] If cream is removed from milk, its density –
A.
Increases
B.
Decreases
C.
Remains the same
D.
May increase or decrease
Ans:
Increases
Explanation :
The density of pure fresh milk being on the average 1.032, while the density of fat globules is about 0.86. It follows that the removal of cream will increase the density, while the addition of water will decrease it.
[2] A piece of ice is floating in water kept in a beaker. When all the ice melts the level of water will -
A.
first rise and then fall
B.
fall
C.
remain the same
D.
rise
Ans:
remain the same
Explanation :
The submerged portion of the ice on melting shrinks a little in volume. So the level of water goes down a little. But this is just made up by the water added by the melting of upper portion.
[3] A steam engine converts the heat energy of steam into .
A.
Electrical energy
B.
Chemical energy
C.
Mechanical energy
D.
Thermal energy
Ans:
Mechanical energy
Explanation :
Steam engine, machine for converting heat energy into mechanical energy using steam as a medium, or working fluid.
[4] A boy is standing in front of a plane mirror at a distance of 3 m from it. What is the distance between the boy and his image?
A.
3 m
B.
6 m
C.
4.5 m
D.
None of these
Ans:
6 m
Explanation :
The image formed by a plane mirror is always virtual upright, and of the same shape and size as the object it is reflecting. A virtual image is a copy of an object formed at the location from which the light rays appear to come
[5] Loudness of sound varies directly with vibrating body’s –
A.
Intensity
B.
Amplitude
C.
Pitch
D.
Quality
Ans:
Amplitude
Explanation :
Loudness of Sound: Loudness of sound depends on amplitude of vibration. Loudness of sound is directly proportional to square of amplitude of vibration.
[6] A thin oil film on a water surface appears coloured because of –
A.
reflection
B.
interference
C.
diffraction
D.
polarization
Ans:
interference
Explanation :
A thin oil film on a water surface appears coloured because of thin-film interference which involves the interference of light waves reflecting off the top surface of a film with the waves reflecting from the bottom surface.
[7] Iron which resembles Cobalt and Nickel in properties has been placed far away from these elements. This was one of the limitations of :
A.
Modern periodic table
B.
Newland's law of octaves
C.
Dobereiner's triads
D.
Mendeleev's periodic table
Ans:
Newland's law of octaves
Explanation :
Among the major limitations of Newlands Law of Octaves, some similar elements have been separated from one another while some dissimilar elements have been placed in the same column.
[8] How much is the difference of time between any two Consecutive longitudes?
A.
10min
B.
14min
C.
4 min
D.
5:30 min
Ans:
4 min
Explanation :
The time difference between each longitude (each degree) is 4 minutes. So if it is 12 noon at Greenwich (0 degree), it would be 12:04 pm at 1 degree meridian and so on.
[9] Which of the following modes of expressing concentration is independent of temperature -
A.
Molarity
B.
Molality
C.
Normality
D.
Formality
Ans:
Molality
Explanation :
Molarity and formality contain volume component. Thus, they depend on temperature. Molality and mole fraction do not contain volume component. Both of them contain weight components. Hence, molality and mole fraction are independent of temperature.
[10] At boiling point of liquids, its –
A.
Temperature increases
B.
Atmospheric pressure increases
C.
Temperature remains constant
D.
Vapour pressure decreases
Ans:
Temperature remains constant
Explanation :
An interesting property of matter is that its temperature remains constant during a phase change, assuming its surrounding pressure is constant. A liquid changes into gaseous state at a constant temperature called its boiling point.
[11] Newton's first law is also known as _.
A.
Law of Friction
B.
Law of Momentum
C.
Law of Inertia
D.
Law of Motion
Ans:
Law of Inertia
Explanation :
Newton's first law of motion is also known as the law of inertia. It states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
[12] The humidity of air measured in percentage is called -
A.
absolute humidity
B.
specific humidity
C.
relative humidity
D.
all of these
Ans:
relative humidity
Explanation :
The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
[13] Who developed the theory of Evolution?
A.
Charles Darwin
B.
Isaac Newton
C.
Pranav Mistry
D.
Galileo Galilei
Ans:
Charles Darwin
Explanation :
Charles Darwin had proposed “theory of Evolution”. The theory of evolution came into view by the reawakening of ancient materialistic philosophies and became widespread in the 19th century. This philosophy supposes that matter is absolute and infinite. This materialistic philosophy does not hold anything to be real except the matter, so it tries to explain the universe and nature through purely material factors.
[14] Which of the following is an insulator?
A.
Mercury
B.
Carbon
C.
Germanium
D.
Glass
Ans:
Glass
Explanation :
Insulators are materials that do not allow the transfer or that slow the transfer of heat or electricity. Some of the examples of insulators are: glass, plastic, rubber, porcelain, wood, ceramic, dry air, etc.
[15] Name the process by which bubbles from liquid are formed?
A.
Effervescence
B.
Surface Tension
C.
Surface Energy
D.
Degasification
Ans:
Effervescence
Explanation :
Effervescence is the escape of gas from an aqueous solution and the foaming or fizzing that results from a release of the gas. It leads to the formation of gas bubbles in a liquid. For example, when opening a bottle of champagne, beer or carbonated beverages such as soft drinks, the visible bubbles are produced by the escape from solution of the dissolved gas.
[16] 'Parsec' is the unit measurement of –
A.
Density of stars
B.
Astronomical distance
C.
Brightness of heavenly bodies
D.
Orbital velocity of giant stars
Ans:
Astronomical distance
Explanation :
Parsec is a unit of distance used in astronomy to measure large distances to objects outside our Solar System. It is equal to about 3.26 light years (3.086 x 1013 kilometres).
[17] The phenomenon of change in direction of light when it passes from one medium to another is called -
A.
Propagation
B.
Reflection
C.
Refraction
D.
Dispersion
Ans:
Refraction
Explanation :
Refraction is the change in direction of wave propagation due to a change in its transmission medium. Due to the change of medium, the phase velocity of the wave is changed but its frequency remains constant.
[18] The mercury and sodium street lamps light up because of –
A.
Atomic emission
B.
Atomic absorption
C.
Electron emission
D.
Electron absorption
Ans:
Atomic emission
Explanation :
The light in sodium vapour lamp and mercury vapour lamp is, because of electron emission. In case of Sodium Lamps, filaments of the lamp sputter fast moving electrons, which hit the sodium atoms (vapour) causing the valence electrons of the sodium atoms to excite to higher energy levels and the electrons thus excited relax by emitting the characteristic monochromatic bright yellow light.
[19] Instrument for measuring wind velocity is called –
A.
Coulombmeter
B.
Anemometer
C.
Cyanometer
D.
Chronometer
Ans:
Anemometer
Explanation :
An anemometer is an instrument that measures wind speed and wind pressure. Anemometers are important tools for meteorologists, who study weather patterns. The term is derived from the Greek word anemos, which means wind.
[20] Who invented the Lightning Rod in 1749?
A.
Benjamin Franklin
B.
Nikola Tesla
C.
Eli Whitney
D.
George Washington
Ans:
Benjamin Franklin
Explanation :
The principle of the lightning rod was first detailed by Benjamin Franklin in Pennsylvania in 1749. In the subsequent years, he developed his invention for household application (published in 1753) and further improvements towards a reliable system around 1760.
[21] Which of the following has the same unit as energy?
A.
Power
B.
Density
C.
Work
D.
Force
Ans:
Work
Explanation :
The SI unit of work is the joule (J), which is defined as the work expended by a force of one Newton through a displacement of one metre.
[22] The 'Greenhouse effect' is mainly due to increase in atmospheric –
A.
Ozone
B.
Nitrogen
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Carbon dioxide
Explanation :
Carbon dioxide is the primary greenhouse gas that is contributing to recent climate change, 72% of the totally emitted greenhouse gases is carbon dioxide (CO2), 18% Methane and 9% Nitrous oxide (NOx). Carbon dioxide emissions therefore are the most important ca s e of global warming.
[23] Matter waves are –
A.
de Broglie waves
B.
Electromagnetic waves
C.
Transverse waves
D.
Longitudinal waves
Ans:
de Broglie waves
Explanation :
In mechanics, matter waves or de Broglie waves reflects the wave-particle duality of matter. The de Broglie relations show that the wavelength is inversely proportional to the momentum of a particle and is also called de Broglie wavelength.
[24] When the milk is churned vigorously the cream from it is separated out clue to –
A.
Centripetal force
B.
Gravitational force
C.
Frictional force
D.
Centrifugal force
Ans:
Centrifugal force
Explanation :
The separation of cream from milk is based on the fact that when liquids of different specific gravity revolve around the same centre at the same distance with the same velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk consists of two liquids of different specific gravity: fat and milk serum.
[25] The temperature at which the catalytic activity of the catalyst is maximum, is called -
A.
room temperature
B.
critical temperature
C.
absolute temperature
D.
optimum temperature
Ans:
optimum temperature
Explanation :
Some catalysts are, however, physically altered by a rise in temperature and hence their catalytic activity may be decreased. This is particularly true with colloidal solutions like that of platinum, since a rise in the temperature may cause their coagulation. In such a case, the rate of reaction increases up to a certain point and then gradually decreases. The rate of reaction is maximum at a particular temperature; that is Optimum temperature.
Explanation :
The density of pure fresh milk being on the average 1.032, while the density of fat globules is about 0.86. It follows that the removal of cream will increase the density, while the addition of water will decrease it.
[2] A piece of ice is floating in water kept in a beaker. When all the ice melts the level of water will -
A.
first rise and then fall
B.
fall
C.
remain the same
D.
rise
Ans:
remain the same
Explanation :
The submerged portion of the ice on melting shrinks a little in volume. So the level of water goes down a little. But this is just made up by the water added by the melting of upper portion.
[3] A steam engine converts the heat energy of steam into .
A.
Electrical energy
B.
Chemical energy
C.
Mechanical energy
D.
Thermal energy
Ans:
Mechanical energy
Explanation :
Steam engine, machine for converting heat energy into mechanical energy using steam as a medium, or working fluid.
[4] A boy is standing in front of a plane mirror at a distance of 3 m from it. What is the distance between the boy and his image?
A.
3 m
B.
6 m
C.
4.5 m
D.
None of these
Ans:
6 m
Explanation :
The image formed by a plane mirror is always virtual upright, and of the same shape and size as the object it is reflecting. A virtual image is a copy of an object formed at the location from which the light rays appear to come
[5] Loudness of sound varies directly with vibrating body’s –
A.
Intensity
B.
Amplitude
C.
Pitch
D.
Quality
Ans:
Amplitude
Explanation :
Loudness of Sound: Loudness of sound depends on amplitude of vibration. Loudness of sound is directly proportional to square of amplitude of vibration.
[6] A thin oil film on a water surface appears coloured because of –
A.
reflection
B.
interference
C.
diffraction
D.
polarization
Ans:
interference
Explanation :
A thin oil film on a water surface appears coloured because of thin-film interference which involves the interference of light waves reflecting off the top surface of a film with the waves reflecting from the bottom surface.
[7] Iron which resembles Cobalt and Nickel in properties has been placed far away from these elements. This was one of the limitations of :
A.
Modern periodic table
B.
Newland's law of octaves
C.
Dobereiner's triads
D.
Mendeleev's periodic table
Ans:
Newland's law of octaves
Explanation :
Among the major limitations of Newlands Law of Octaves, some similar elements have been separated from one another while some dissimilar elements have been placed in the same column.
[8] How much is the difference of time between any two Consecutive longitudes?
A.
10min
B.
14min
C.
4 min
D.
5:30 min
Ans:
4 min
Explanation :
The time difference between each longitude (each degree) is 4 minutes. So if it is 12 noon at Greenwich (0 degree), it would be 12:04 pm at 1 degree meridian and so on.
[9] Which of the following modes of expressing concentration is independent of temperature -
A.
Molarity
B.
Molality
C.
Normality
D.
Formality
Ans:
Molality
Explanation :
Molarity and formality contain volume component. Thus, they depend on temperature. Molality and mole fraction do not contain volume component. Both of them contain weight components. Hence, molality and mole fraction are independent of temperature.
[10] At boiling point of liquids, its –
A.
Temperature increases
B.
Atmospheric pressure increases
C.
Temperature remains constant
D.
Vapour pressure decreases
Ans:
Temperature remains constant
Explanation :
An interesting property of matter is that its temperature remains constant during a phase change, assuming its surrounding pressure is constant. A liquid changes into gaseous state at a constant temperature called its boiling point.
[11] Newton's first law is also known as _.
A.
Law of Friction
B.
Law of Momentum
C.
Law of Inertia
D.
Law of Motion
Ans:
Law of Inertia
Explanation :
Newton's first law of motion is also known as the law of inertia. It states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
[12] The humidity of air measured in percentage is called -
A.
absolute humidity
B.
specific humidity
C.
relative humidity
D.
all of these
Ans:
relative humidity
Explanation :
The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
[13] Who developed the theory of Evolution?
A.
Charles Darwin
B.
Isaac Newton
C.
Pranav Mistry
D.
Galileo Galilei
Ans:
Charles Darwin
Explanation :
Charles Darwin had proposed “theory of Evolution”. The theory of evolution came into view by the reawakening of ancient materialistic philosophies and became widespread in the 19th century. This philosophy supposes that matter is absolute and infinite. This materialistic philosophy does not hold anything to be real except the matter, so it tries to explain the universe and nature through purely material factors.
[14] Which of the following is an insulator?
A.
Mercury
B.
Carbon
C.
Germanium
D.
Glass
Ans:
Glass
Explanation :
Insulators are materials that do not allow the transfer or that slow the transfer of heat or electricity. Some of the examples of insulators are: glass, plastic, rubber, porcelain, wood, ceramic, dry air, etc.
[15] Name the process by which bubbles from liquid are formed?
A.
Effervescence
B.
Surface Tension
C.
Surface Energy
D.
Degasification
Ans:
Effervescence
Explanation :
Effervescence is the escape of gas from an aqueous solution and the foaming or fizzing that results from a release of the gas. It leads to the formation of gas bubbles in a liquid. For example, when opening a bottle of champagne, beer or carbonated beverages such as soft drinks, the visible bubbles are produced by the escape from solution of the dissolved gas.
[16] 'Parsec' is the unit measurement of –
A.
Density of stars
B.
Astronomical distance
C.
Brightness of heavenly bodies
D.
Orbital velocity of giant stars
Ans:
Astronomical distance
Explanation :
Parsec is a unit of distance used in astronomy to measure large distances to objects outside our Solar System. It is equal to about 3.26 light years (3.086 x 1013 kilometres).
[17] The phenomenon of change in direction of light when it passes from one medium to another is called -
A.
Propagation
B.
Reflection
C.
Refraction
D.
Dispersion
Ans:
Refraction
Explanation :
Refraction is the change in direction of wave propagation due to a change in its transmission medium. Due to the change of medium, the phase velocity of the wave is changed but its frequency remains constant.
[18] The mercury and sodium street lamps light up because of –
A.
Atomic emission
B.
Atomic absorption
C.
Electron emission
D.
Electron absorption
Ans:
Atomic emission
Explanation :
The light in sodium vapour lamp and mercury vapour lamp is, because of electron emission. In case of Sodium Lamps, filaments of the lamp sputter fast moving electrons, which hit the sodium atoms (vapour) causing the valence electrons of the sodium atoms to excite to higher energy levels and the electrons thus excited relax by emitting the characteristic monochromatic bright yellow light.
[19] Instrument for measuring wind velocity is called –
A.
Coulombmeter
B.
Anemometer
C.
Cyanometer
D.
Chronometer
Ans:
Anemometer
Explanation :
An anemometer is an instrument that measures wind speed and wind pressure. Anemometers are important tools for meteorologists, who study weather patterns. The term is derived from the Greek word anemos, which means wind.
[20] Who invented the Lightning Rod in 1749?
A.
Benjamin Franklin
B.
Nikola Tesla
C.
Eli Whitney
D.
George Washington
Ans:
Benjamin Franklin
Explanation :
The principle of the lightning rod was first detailed by Benjamin Franklin in Pennsylvania in 1749. In the subsequent years, he developed his invention for household application (published in 1753) and further improvements towards a reliable system around 1760.
[21] Which of the following has the same unit as energy?
A.
Power
B.
Density
C.
Work
D.
Force
Ans:
Work
Explanation :
The SI unit of work is the joule (J), which is defined as the work expended by a force of one Newton through a displacement of one metre.
[22] The 'Greenhouse effect' is mainly due to increase in atmospheric –
A.
Ozone
B.
Nitrogen
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Carbon dioxide
Explanation :
Carbon dioxide is the primary greenhouse gas that is contributing to recent climate change, 72% of the totally emitted greenhouse gases is carbon dioxide (CO2), 18% Methane and 9% Nitrous oxide (NOx). Carbon dioxide emissions therefore are the most important ca s e of global warming.
[23] Matter waves are –
A.
de Broglie waves
B.
Electromagnetic waves
C.
Transverse waves
D.
Longitudinal waves
Ans:
de Broglie waves
Explanation :
In mechanics, matter waves or de Broglie waves reflects the wave-particle duality of matter. The de Broglie relations show that the wavelength is inversely proportional to the momentum of a particle and is also called de Broglie wavelength.
[24] When the milk is churned vigorously the cream from it is separated out clue to –
A.
Centripetal force
B.
Gravitational force
C.
Frictional force
D.
Centrifugal force
Ans:
Centrifugal force
Explanation :
The separation of cream from milk is based on the fact that when liquids of different specific gravity revolve around the same centre at the same distance with the same velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk consists of two liquids of different specific gravity: fat and milk serum.
[25] The temperature at which the catalytic activity of the catalyst is maximum, is called -
A.
room temperature
B.
critical temperature
C.
absolute temperature
D.
optimum temperature
Ans:
optimum temperature
Explanation :
Some catalysts are, however, physically altered by a rise in temperature and hence their catalytic activity may be decreased. This is particularly true with colloidal solutions like that of platinum, since a rise in the temperature may cause their coagulation. In such a case, the rate of reaction increases up to a certain point and then gradually decreases. The rate of reaction is maximum at a particular temperature; that is Optimum temperature.
Explanation :
Steam engine, machine for converting heat energy into mechanical energy using steam as a medium, or working fluid.
[4] A boy is standing in front of a plane mirror at a distance of 3 m from it. What is the distance between the boy and his image?
A.
3 m
B.
6 m
C.
4.5 m
D.
None of these
Ans:
6 m
Explanation :
The image formed by a plane mirror is always virtual upright, and of the same shape and size as the object it is reflecting. A virtual image is a copy of an object formed at the location from which the light rays appear to come
[5] Loudness of sound varies directly with vibrating body’s –
A.
Intensity
B.
Amplitude
C.
Pitch
D.
Quality
Ans:
Amplitude
Explanation :
Loudness of Sound: Loudness of sound depends on amplitude of vibration. Loudness of sound is directly proportional to square of amplitude of vibration.
[6] A thin oil film on a water surface appears coloured because of –
A.
reflection
B.
interference
C.
diffraction
D.
polarization
Ans:
interference
Explanation :
A thin oil film on a water surface appears coloured because of thin-film interference which involves the interference of light waves reflecting off the top surface of a film with the waves reflecting from the bottom surface.
[7] Iron which resembles Cobalt and Nickel in properties has been placed far away from these elements. This was one of the limitations of :
A.
Modern periodic table
B.
Newland's law of octaves
C.
Dobereiner's triads
D.
Mendeleev's periodic table
Ans:
Newland's law of octaves
Explanation :
Among the major limitations of Newlands Law of Octaves, some similar elements have been separated from one another while some dissimilar elements have been placed in the same column.
[8] How much is the difference of time between any two Consecutive longitudes?
A.
10min
B.
14min
C.
4 min
D.
5:30 min
Ans:
4 min
Explanation :
The time difference between each longitude (each degree) is 4 minutes. So if it is 12 noon at Greenwich (0 degree), it would be 12:04 pm at 1 degree meridian and so on.
[9] Which of the following modes of expressing concentration is independent of temperature -
A.
Molarity
B.
Molality
C.
Normality
D.
Formality
Ans:
Molality
Explanation :
Molarity and formality contain volume component. Thus, they depend on temperature. Molality and mole fraction do not contain volume component. Both of them contain weight components. Hence, molality and mole fraction are independent of temperature.
[10] At boiling point of liquids, its –
A.
Temperature increases
B.
Atmospheric pressure increases
C.
Temperature remains constant
D.
Vapour pressure decreases
Ans:
Temperature remains constant
Explanation :
An interesting property of matter is that its temperature remains constant during a phase change, assuming its surrounding pressure is constant. A liquid changes into gaseous state at a constant temperature called its boiling point.
[11] Newton's first law is also known as _.
A.
Law of Friction
B.
Law of Momentum
C.
Law of Inertia
D.
Law of Motion
Ans:
Law of Inertia
Explanation :
Newton's first law of motion is also known as the law of inertia. It states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
[12] The humidity of air measured in percentage is called -
A.
absolute humidity
B.
specific humidity
C.
relative humidity
D.
all of these
Ans:
relative humidity
Explanation :
The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
[13] Who developed the theory of Evolution?
A.
Charles Darwin
B.
Isaac Newton
C.
Pranav Mistry
D.
Galileo Galilei
Ans:
Charles Darwin
Explanation :
Charles Darwin had proposed “theory of Evolution”. The theory of evolution came into view by the reawakening of ancient materialistic philosophies and became widespread in the 19th century. This philosophy supposes that matter is absolute and infinite. This materialistic philosophy does not hold anything to be real except the matter, so it tries to explain the universe and nature through purely material factors.
[14] Which of the following is an insulator?
A.
Mercury
B.
Carbon
C.
Germanium
D.
Glass
Ans:
Glass
Explanation :
Insulators are materials that do not allow the transfer or that slow the transfer of heat or electricity. Some of the examples of insulators are: glass, plastic, rubber, porcelain, wood, ceramic, dry air, etc.
[15] Name the process by which bubbles from liquid are formed?
A.
Effervescence
B.
Surface Tension
C.
Surface Energy
D.
Degasification
Ans:
Effervescence
Explanation :
Effervescence is the escape of gas from an aqueous solution and the foaming or fizzing that results from a release of the gas. It leads to the formation of gas bubbles in a liquid. For example, when opening a bottle of champagne, beer or carbonated beverages such as soft drinks, the visible bubbles are produced by the escape from solution of the dissolved gas.
[16] 'Parsec' is the unit measurement of –
A.
Density of stars
B.
Astronomical distance
C.
Brightness of heavenly bodies
D.
Orbital velocity of giant stars
Ans:
Astronomical distance
Explanation :
Parsec is a unit of distance used in astronomy to measure large distances to objects outside our Solar System. It is equal to about 3.26 light years (3.086 x 1013 kilometres).
[17] The phenomenon of change in direction of light when it passes from one medium to another is called -
A.
Propagation
B.
Reflection
C.
Refraction
D.
Dispersion
Ans:
Refraction
Explanation :
Refraction is the change in direction of wave propagation due to a change in its transmission medium. Due to the change of medium, the phase velocity of the wave is changed but its frequency remains constant.
[18] The mercury and sodium street lamps light up because of –
A.
Atomic emission
B.
Atomic absorption
C.
Electron emission
D.
Electron absorption
Ans:
Atomic emission
Explanation :
The light in sodium vapour lamp and mercury vapour lamp is, because of electron emission. In case of Sodium Lamps, filaments of the lamp sputter fast moving electrons, which hit the sodium atoms (vapour) causing the valence electrons of the sodium atoms to excite to higher energy levels and the electrons thus excited relax by emitting the characteristic monochromatic bright yellow light.
[19] Instrument for measuring wind velocity is called –
A.
Coulombmeter
B.
Anemometer
C.
Cyanometer
D.
Chronometer
Ans:
Anemometer
Explanation :
An anemometer is an instrument that measures wind speed and wind pressure. Anemometers are important tools for meteorologists, who study weather patterns. The term is derived from the Greek word anemos, which means wind.
[20] Who invented the Lightning Rod in 1749?
A.
Benjamin Franklin
B.
Nikola Tesla
C.
Eli Whitney
D.
George Washington
Ans:
Benjamin Franklin
Explanation :
The principle of the lightning rod was first detailed by Benjamin Franklin in Pennsylvania in 1749. In the subsequent years, he developed his invention for household application (published in 1753) and further improvements towards a reliable system around 1760.
[21] Which of the following has the same unit as energy?
A.
Power
B.
Density
C.
Work
D.
Force
Ans:
Work
Explanation :
The SI unit of work is the joule (J), which is defined as the work expended by a force of one Newton through a displacement of one metre.
[22] The 'Greenhouse effect' is mainly due to increase in atmospheric –
A.
Ozone
B.
Nitrogen
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Carbon dioxide
Explanation :
Carbon dioxide is the primary greenhouse gas that is contributing to recent climate change, 72% of the totally emitted greenhouse gases is carbon dioxide (CO2), 18% Methane and 9% Nitrous oxide (NOx). Carbon dioxide emissions therefore are the most important ca s e of global warming.
[23] Matter waves are –
A.
de Broglie waves
B.
Electromagnetic waves
C.
Transverse waves
D.
Longitudinal waves
Ans:
de Broglie waves
Explanation :
In mechanics, matter waves or de Broglie waves reflects the wave-particle duality of matter. The de Broglie relations show that the wavelength is inversely proportional to the momentum of a particle and is also called de Broglie wavelength.
[24] When the milk is churned vigorously the cream from it is separated out clue to –
A.
Centripetal force
B.
Gravitational force
C.
Frictional force
D.
Centrifugal force
Ans:
Centrifugal force
Explanation :
The separation of cream from milk is based on the fact that when liquids of different specific gravity revolve around the same centre at the same distance with the same velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk consists of two liquids of different specific gravity: fat and milk serum.
[25] The temperature at which the catalytic activity of the catalyst is maximum, is called -
A.
room temperature
B.
critical temperature
C.
absolute temperature
D.
optimum temperature
Ans:
optimum temperature
Explanation :
Some catalysts are, however, physically altered by a rise in temperature and hence their catalytic activity may be decreased. This is particularly true with colloidal solutions like that of platinum, since a rise in the temperature may cause their coagulation. In such a case, the rate of reaction increases up to a certain point and then gradually decreases. The rate of reaction is maximum at a particular temperature; that is Optimum temperature.
Explanation :
Loudness of Sound: Loudness of sound depends on amplitude of vibration. Loudness of sound is directly proportional to square of amplitude of vibration.
[6] A thin oil film on a water surface appears coloured because of –
A.
reflection
B.
interference
C.
diffraction
D.
polarization
Ans:
interference
Explanation :
A thin oil film on a water surface appears coloured because of thin-film interference which involves the interference of light waves reflecting off the top surface of a film with the waves reflecting from the bottom surface.
[7] Iron which resembles Cobalt and Nickel in properties has been placed far away from these elements. This was one of the limitations of :
A.
Modern periodic table
B.
Newland's law of octaves
C.
Dobereiner's triads
D.
Mendeleev's periodic table
Ans:
Newland's law of octaves
Explanation :
Among the major limitations of Newlands Law of Octaves, some similar elements have been separated from one another while some dissimilar elements have been placed in the same column.
[8] How much is the difference of time between any two Consecutive longitudes?
A.
10min
B.
14min
C.
4 min
D.
5:30 min
Ans:
4 min
Explanation :
The time difference between each longitude (each degree) is 4 minutes. So if it is 12 noon at Greenwich (0 degree), it would be 12:04 pm at 1 degree meridian and so on.
[9] Which of the following modes of expressing concentration is independent of temperature -
A.
Molarity
B.
Molality
C.
Normality
D.
Formality
Ans:
Molality
Explanation :
Molarity and formality contain volume component. Thus, they depend on temperature. Molality and mole fraction do not contain volume component. Both of them contain weight components. Hence, molality and mole fraction are independent of temperature.
[10] At boiling point of liquids, its –
A.
Temperature increases
B.
Atmospheric pressure increases
C.
Temperature remains constant
D.
Vapour pressure decreases
Ans:
Temperature remains constant
Explanation :
An interesting property of matter is that its temperature remains constant during a phase change, assuming its surrounding pressure is constant. A liquid changes into gaseous state at a constant temperature called its boiling point.
[11] Newton's first law is also known as _.
A.
Law of Friction
B.
Law of Momentum
C.
Law of Inertia
D.
Law of Motion
Ans:
Law of Inertia
Explanation :
Newton's first law of motion is also known as the law of inertia. It states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
[12] The humidity of air measured in percentage is called -
A.
absolute humidity
B.
specific humidity
C.
relative humidity
D.
all of these
Ans:
relative humidity
Explanation :
The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
[13] Who developed the theory of Evolution?
A.
Charles Darwin
B.
Isaac Newton
C.
Pranav Mistry
D.
Galileo Galilei
Ans:
Charles Darwin
Explanation :
Charles Darwin had proposed “theory of Evolution”. The theory of evolution came into view by the reawakening of ancient materialistic philosophies and became widespread in the 19th century. This philosophy supposes that matter is absolute and infinite. This materialistic philosophy does not hold anything to be real except the matter, so it tries to explain the universe and nature through purely material factors.
[14] Which of the following is an insulator?
A.
Mercury
B.
Carbon
C.
Germanium
D.
Glass
Ans:
Glass
Explanation :
Insulators are materials that do not allow the transfer or that slow the transfer of heat or electricity. Some of the examples of insulators are: glass, plastic, rubber, porcelain, wood, ceramic, dry air, etc.
[15] Name the process by which bubbles from liquid are formed?
A.
Effervescence
B.
Surface Tension
C.
Surface Energy
D.
Degasification
Ans:
Effervescence
Explanation :
Effervescence is the escape of gas from an aqueous solution and the foaming or fizzing that results from a release of the gas. It leads to the formation of gas bubbles in a liquid. For example, when opening a bottle of champagne, beer or carbonated beverages such as soft drinks, the visible bubbles are produced by the escape from solution of the dissolved gas.
[16] 'Parsec' is the unit measurement of –
A.
Density of stars
B.
Astronomical distance
C.
Brightness of heavenly bodies
D.
Orbital velocity of giant stars
Ans:
Astronomical distance
Explanation :
Parsec is a unit of distance used in astronomy to measure large distances to objects outside our Solar System. It is equal to about 3.26 light years (3.086 x 1013 kilometres).
[17] The phenomenon of change in direction of light when it passes from one medium to another is called -
A.
Propagation
B.
Reflection
C.
Refraction
D.
Dispersion
Ans:
Refraction
Explanation :
Refraction is the change in direction of wave propagation due to a change in its transmission medium. Due to the change of medium, the phase velocity of the wave is changed but its frequency remains constant.
[18] The mercury and sodium street lamps light up because of –
A.
Atomic emission
B.
Atomic absorption
C.
Electron emission
D.
Electron absorption
Ans:
Atomic emission
Explanation :
The light in sodium vapour lamp and mercury vapour lamp is, because of electron emission. In case of Sodium Lamps, filaments of the lamp sputter fast moving electrons, which hit the sodium atoms (vapour) causing the valence electrons of the sodium atoms to excite to higher energy levels and the electrons thus excited relax by emitting the characteristic monochromatic bright yellow light.
[19] Instrument for measuring wind velocity is called –
A.
Coulombmeter
B.
Anemometer
C.
Cyanometer
D.
Chronometer
Ans:
Anemometer
Explanation :
An anemometer is an instrument that measures wind speed and wind pressure. Anemometers are important tools for meteorologists, who study weather patterns. The term is derived from the Greek word anemos, which means wind.
[20] Who invented the Lightning Rod in 1749?
A.
Benjamin Franklin
B.
Nikola Tesla
C.
Eli Whitney
D.
George Washington
Ans:
Benjamin Franklin
Explanation :
The principle of the lightning rod was first detailed by Benjamin Franklin in Pennsylvania in 1749. In the subsequent years, he developed his invention for household application (published in 1753) and further improvements towards a reliable system around 1760.
[21] Which of the following has the same unit as energy?
A.
Power
B.
Density
C.
Work
D.
Force
Ans:
Work
Explanation :
The SI unit of work is the joule (J), which is defined as the work expended by a force of one Newton through a displacement of one metre.
[22] The 'Greenhouse effect' is mainly due to increase in atmospheric –
A.
Ozone
B.
Nitrogen
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Carbon dioxide
Explanation :
Carbon dioxide is the primary greenhouse gas that is contributing to recent climate change, 72% of the totally emitted greenhouse gases is carbon dioxide (CO2), 18% Methane and 9% Nitrous oxide (NOx). Carbon dioxide emissions therefore are the most important ca s e of global warming.
[23] Matter waves are –
A.
de Broglie waves
B.
Electromagnetic waves
C.
Transverse waves
D.
Longitudinal waves
Ans:
de Broglie waves
Explanation :
In mechanics, matter waves or de Broglie waves reflects the wave-particle duality of matter. The de Broglie relations show that the wavelength is inversely proportional to the momentum of a particle and is also called de Broglie wavelength.
[24] When the milk is churned vigorously the cream from it is separated out clue to –
A.
Centripetal force
B.
Gravitational force
C.
Frictional force
D.
Centrifugal force
Ans:
Centrifugal force
Explanation :
The separation of cream from milk is based on the fact that when liquids of different specific gravity revolve around the same centre at the same distance with the same velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk consists of two liquids of different specific gravity: fat and milk serum.
[25] The temperature at which the catalytic activity of the catalyst is maximum, is called -
A.
room temperature
B.
critical temperature
C.
absolute temperature
D.
optimum temperature
Ans:
optimum temperature
Explanation :
Some catalysts are, however, physically altered by a rise in temperature and hence their catalytic activity may be decreased. This is particularly true with colloidal solutions like that of platinum, since a rise in the temperature may cause their coagulation. In such a case, the rate of reaction increases up to a certain point and then gradually decreases. The rate of reaction is maximum at a particular temperature; that is Optimum temperature.
Explanation :
Among the major limitations of Newlands Law of Octaves, some similar elements have been separated from one another while some dissimilar elements have been placed in the same column.
[8] How much is the difference of time between any two Consecutive longitudes?
A.
10min
B.
14min
C.
4 min
D.
5:30 min
Ans:
4 min
Explanation :
The time difference between each longitude (each degree) is 4 minutes. So if it is 12 noon at Greenwich (0 degree), it would be 12:04 pm at 1 degree meridian and so on.
[9] Which of the following modes of expressing concentration is independent of temperature -
A.
Molarity
B.
Molality
C.
Normality
D.
Formality
Ans:
Molality
Explanation :
Molarity and formality contain volume component. Thus, they depend on temperature. Molality and mole fraction do not contain volume component. Both of them contain weight components. Hence, molality and mole fraction are independent of temperature.
[10] At boiling point of liquids, its –
A.
Temperature increases
B.
Atmospheric pressure increases
C.
Temperature remains constant
D.
Vapour pressure decreases
Ans:
Temperature remains constant
Explanation :
An interesting property of matter is that its temperature remains constant during a phase change, assuming its surrounding pressure is constant. A liquid changes into gaseous state at a constant temperature called its boiling point.
[11] Newton's first law is also known as _.
A.
Law of Friction
B.
Law of Momentum
C.
Law of Inertia
D.
Law of Motion
Ans:
Law of Inertia
Explanation :
Newton's first law of motion is also known as the law of inertia. It states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
[12] The humidity of air measured in percentage is called -
A.
absolute humidity
B.
specific humidity
C.
relative humidity
D.
all of these
Ans:
relative humidity
Explanation :
The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
[13] Who developed the theory of Evolution?
A.
Charles Darwin
B.
Isaac Newton
C.
Pranav Mistry
D.
Galileo Galilei
Ans:
Charles Darwin
Explanation :
Charles Darwin had proposed “theory of Evolution”. The theory of evolution came into view by the reawakening of ancient materialistic philosophies and became widespread in the 19th century. This philosophy supposes that matter is absolute and infinite. This materialistic philosophy does not hold anything to be real except the matter, so it tries to explain the universe and nature through purely material factors.
[14] Which of the following is an insulator?
A.
Mercury
B.
Carbon
C.
Germanium
D.
Glass
Ans:
Glass
Explanation :
Insulators are materials that do not allow the transfer or that slow the transfer of heat or electricity. Some of the examples of insulators are: glass, plastic, rubber, porcelain, wood, ceramic, dry air, etc.
[15] Name the process by which bubbles from liquid are formed?
A.
Effervescence
B.
Surface Tension
C.
Surface Energy
D.
Degasification
Ans:
Effervescence
Explanation :
Effervescence is the escape of gas from an aqueous solution and the foaming or fizzing that results from a release of the gas. It leads to the formation of gas bubbles in a liquid. For example, when opening a bottle of champagne, beer or carbonated beverages such as soft drinks, the visible bubbles are produced by the escape from solution of the dissolved gas.
[16] 'Parsec' is the unit measurement of –
A.
Density of stars
B.
Astronomical distance
C.
Brightness of heavenly bodies
D.
Orbital velocity of giant stars
Ans:
Astronomical distance
Explanation :
Parsec is a unit of distance used in astronomy to measure large distances to objects outside our Solar System. It is equal to about 3.26 light years (3.086 x 1013 kilometres).
[17] The phenomenon of change in direction of light when it passes from one medium to another is called -
A.
Propagation
B.
Reflection
C.
Refraction
D.
Dispersion
Ans:
Refraction
Explanation :
Refraction is the change in direction of wave propagation due to a change in its transmission medium. Due to the change of medium, the phase velocity of the wave is changed but its frequency remains constant.
[18] The mercury and sodium street lamps light up because of –
A.
Atomic emission
B.
Atomic absorption
C.
Electron emission
D.
Electron absorption
Ans:
Atomic emission
Explanation :
The light in sodium vapour lamp and mercury vapour lamp is, because of electron emission. In case of Sodium Lamps, filaments of the lamp sputter fast moving electrons, which hit the sodium atoms (vapour) causing the valence electrons of the sodium atoms to excite to higher energy levels and the electrons thus excited relax by emitting the characteristic monochromatic bright yellow light.
[19] Instrument for measuring wind velocity is called –
A.
Coulombmeter
B.
Anemometer
C.
Cyanometer
D.
Chronometer
Ans:
Anemometer
Explanation :
An anemometer is an instrument that measures wind speed and wind pressure. Anemometers are important tools for meteorologists, who study weather patterns. The term is derived from the Greek word anemos, which means wind.
[20] Who invented the Lightning Rod in 1749?
A.
Benjamin Franklin
B.
Nikola Tesla
C.
Eli Whitney
D.
George Washington
Ans:
Benjamin Franklin
Explanation :
The principle of the lightning rod was first detailed by Benjamin Franklin in Pennsylvania in 1749. In the subsequent years, he developed his invention for household application (published in 1753) and further improvements towards a reliable system around 1760.
[21] Which of the following has the same unit as energy?
A.
Power
B.
Density
C.
Work
D.
Force
Ans:
Work
Explanation :
The SI unit of work is the joule (J), which is defined as the work expended by a force of one Newton through a displacement of one metre.
[22] The 'Greenhouse effect' is mainly due to increase in atmospheric –
A.
Ozone
B.
Nitrogen
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Carbon dioxide
Explanation :
Carbon dioxide is the primary greenhouse gas that is contributing to recent climate change, 72% of the totally emitted greenhouse gases is carbon dioxide (CO2), 18% Methane and 9% Nitrous oxide (NOx). Carbon dioxide emissions therefore are the most important ca s e of global warming.
[23] Matter waves are –
A.
de Broglie waves
B.
Electromagnetic waves
C.
Transverse waves
D.
Longitudinal waves
Ans:
de Broglie waves
Explanation :
In mechanics, matter waves or de Broglie waves reflects the wave-particle duality of matter. The de Broglie relations show that the wavelength is inversely proportional to the momentum of a particle and is also called de Broglie wavelength.
[24] When the milk is churned vigorously the cream from it is separated out clue to –
A.
Centripetal force
B.
Gravitational force
C.
Frictional force
D.
Centrifugal force
Ans:
Centrifugal force
Explanation :
The separation of cream from milk is based on the fact that when liquids of different specific gravity revolve around the same centre at the same distance with the same velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk consists of two liquids of different specific gravity: fat and milk serum.
[25] The temperature at which the catalytic activity of the catalyst is maximum, is called -
A.
room temperature
B.
critical temperature
C.
absolute temperature
D.
optimum temperature
Ans:
optimum temperature
Explanation :
Some catalysts are, however, physically altered by a rise in temperature and hence their catalytic activity may be decreased. This is particularly true with colloidal solutions like that of platinum, since a rise in the temperature may cause their coagulation. In such a case, the rate of reaction increases up to a certain point and then gradually decreases. The rate of reaction is maximum at a particular temperature; that is Optimum temperature.
Explanation :
Molarity and formality contain volume component. Thus, they depend on temperature. Molality and mole fraction do not contain volume component. Both of them contain weight components. Hence, molality and mole fraction are independent of temperature.
[10] At boiling point of liquids, its –
A.
Temperature increases
B.
Atmospheric pressure increases
C.
Temperature remains constant
D.
Vapour pressure decreases
Ans:
Temperature remains constant
Explanation :
An interesting property of matter is that its temperature remains constant during a phase change, assuming its surrounding pressure is constant. A liquid changes into gaseous state at a constant temperature called its boiling point.
[11] Newton's first law is also known as _.
A.
Law of Friction
B.
Law of Momentum
C.
Law of Inertia
D.
Law of Motion
Ans:
Law of Inertia
Explanation :
Newton's first law of motion is also known as the law of inertia. It states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
[12] The humidity of air measured in percentage is called -
A.
absolute humidity
B.
specific humidity
C.
relative humidity
D.
all of these
Ans:
relative humidity
Explanation :
The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
[13] Who developed the theory of Evolution?
A.
Charles Darwin
B.
Isaac Newton
C.
Pranav Mistry
D.
Galileo Galilei
Ans:
Charles Darwin
Explanation :
Charles Darwin had proposed “theory of Evolution”. The theory of evolution came into view by the reawakening of ancient materialistic philosophies and became widespread in the 19th century. This philosophy supposes that matter is absolute and infinite. This materialistic philosophy does not hold anything to be real except the matter, so it tries to explain the universe and nature through purely material factors.
[14] Which of the following is an insulator?
A.
Mercury
B.
Carbon
C.
Germanium
D.
Glass
Ans:
Glass
Explanation :
Insulators are materials that do not allow the transfer or that slow the transfer of heat or electricity. Some of the examples of insulators are: glass, plastic, rubber, porcelain, wood, ceramic, dry air, etc.
[15] Name the process by which bubbles from liquid are formed?
A.
Effervescence
B.
Surface Tension
C.
Surface Energy
D.
Degasification
Ans:
Effervescence
Explanation :
Effervescence is the escape of gas from an aqueous solution and the foaming or fizzing that results from a release of the gas. It leads to the formation of gas bubbles in a liquid. For example, when opening a bottle of champagne, beer or carbonated beverages such as soft drinks, the visible bubbles are produced by the escape from solution of the dissolved gas.
[16] 'Parsec' is the unit measurement of –
A.
Density of stars
B.
Astronomical distance
C.
Brightness of heavenly bodies
D.
Orbital velocity of giant stars
Ans:
Astronomical distance
Explanation :
Parsec is a unit of distance used in astronomy to measure large distances to objects outside our Solar System. It is equal to about 3.26 light years (3.086 x 1013 kilometres).
[17] The phenomenon of change in direction of light when it passes from one medium to another is called -
A.
Propagation
B.
Reflection
C.
Refraction
D.
Dispersion
Ans:
Refraction
Explanation :
Refraction is the change in direction of wave propagation due to a change in its transmission medium. Due to the change of medium, the phase velocity of the wave is changed but its frequency remains constant.
[18] The mercury and sodium street lamps light up because of –
A.
Atomic emission
B.
Atomic absorption
C.
Electron emission
D.
Electron absorption
Ans:
Atomic emission
Explanation :
The light in sodium vapour lamp and mercury vapour lamp is, because of electron emission. In case of Sodium Lamps, filaments of the lamp sputter fast moving electrons, which hit the sodium atoms (vapour) causing the valence electrons of the sodium atoms to excite to higher energy levels and the electrons thus excited relax by emitting the characteristic monochromatic bright yellow light.
[19] Instrument for measuring wind velocity is called –
A.
Coulombmeter
B.
Anemometer
C.
Cyanometer
D.
Chronometer
Ans:
Anemometer
Explanation :
An anemometer is an instrument that measures wind speed and wind pressure. Anemometers are important tools for meteorologists, who study weather patterns. The term is derived from the Greek word anemos, which means wind.
[20] Who invented the Lightning Rod in 1749?
A.
Benjamin Franklin
B.
Nikola Tesla
C.
Eli Whitney
D.
George Washington
Ans:
Benjamin Franklin
Explanation :
The principle of the lightning rod was first detailed by Benjamin Franklin in Pennsylvania in 1749. In the subsequent years, he developed his invention for household application (published in 1753) and further improvements towards a reliable system around 1760.
[21] Which of the following has the same unit as energy?
A.
Power
B.
Density
C.
Work
D.
Force
Ans:
Work
Explanation :
The SI unit of work is the joule (J), which is defined as the work expended by a force of one Newton through a displacement of one metre.
[22] The 'Greenhouse effect' is mainly due to increase in atmospheric –
A.
Ozone
B.
Nitrogen
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Carbon dioxide
Explanation :
Carbon dioxide is the primary greenhouse gas that is contributing to recent climate change, 72% of the totally emitted greenhouse gases is carbon dioxide (CO2), 18% Methane and 9% Nitrous oxide (NOx). Carbon dioxide emissions therefore are the most important ca s e of global warming.
[23] Matter waves are –
A.
de Broglie waves
B.
Electromagnetic waves
C.
Transverse waves
D.
Longitudinal waves
Ans:
de Broglie waves
Explanation :
In mechanics, matter waves or de Broglie waves reflects the wave-particle duality of matter. The de Broglie relations show that the wavelength is inversely proportional to the momentum of a particle and is also called de Broglie wavelength.
[24] When the milk is churned vigorously the cream from it is separated out clue to –
A.
Centripetal force
B.
Gravitational force
C.
Frictional force
D.
Centrifugal force
Ans:
Centrifugal force
Explanation :
The separation of cream from milk is based on the fact that when liquids of different specific gravity revolve around the same centre at the same distance with the same velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk consists of two liquids of different specific gravity: fat and milk serum.
[25] The temperature at which the catalytic activity of the catalyst is maximum, is called -
A.
room temperature
B.
critical temperature
C.
absolute temperature
D.
optimum temperature
Ans:
optimum temperature
Explanation :
Some catalysts are, however, physically altered by a rise in temperature and hence their catalytic activity may be decreased. This is particularly true with colloidal solutions like that of platinum, since a rise in the temperature may cause their coagulation. In such a case, the rate of reaction increases up to a certain point and then gradually decreases. The rate of reaction is maximum at a particular temperature; that is Optimum temperature.
Explanation :
Newton's first law of motion is also known as the law of inertia. It states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
[12] The humidity of air measured in percentage is called -
A.
absolute humidity
B.
specific humidity
C.
relative humidity
D.
all of these
Ans:
relative humidity
Explanation :
The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
[13] Who developed the theory of Evolution?
A.
Charles Darwin
B.
Isaac Newton
C.
Pranav Mistry
D.
Galileo Galilei
Ans:
Charles Darwin
Explanation :
Charles Darwin had proposed “theory of Evolution”. The theory of evolution came into view by the reawakening of ancient materialistic philosophies and became widespread in the 19th century. This philosophy supposes that matter is absolute and infinite. This materialistic philosophy does not hold anything to be real except the matter, so it tries to explain the universe and nature through purely material factors.
[14] Which of the following is an insulator?
A.
Mercury
B.
Carbon
C.
Germanium
D.
Glass
Ans:
Glass
Explanation :
Insulators are materials that do not allow the transfer or that slow the transfer of heat or electricity. Some of the examples of insulators are: glass, plastic, rubber, porcelain, wood, ceramic, dry air, etc.
[15] Name the process by which bubbles from liquid are formed?
A.
Effervescence
B.
Surface Tension
C.
Surface Energy
D.
Degasification
Ans:
Effervescence
Explanation :
Effervescence is the escape of gas from an aqueous solution and the foaming or fizzing that results from a release of the gas. It leads to the formation of gas bubbles in a liquid. For example, when opening a bottle of champagne, beer or carbonated beverages such as soft drinks, the visible bubbles are produced by the escape from solution of the dissolved gas.
[16] 'Parsec' is the unit measurement of –
A.
Density of stars
B.
Astronomical distance
C.
Brightness of heavenly bodies
D.
Orbital velocity of giant stars
Ans:
Astronomical distance
Explanation :
Parsec is a unit of distance used in astronomy to measure large distances to objects outside our Solar System. It is equal to about 3.26 light years (3.086 x 1013 kilometres).
[17] The phenomenon of change in direction of light when it passes from one medium to another is called -
A.
Propagation
B.
Reflection
C.
Refraction
D.
Dispersion
Ans:
Refraction
Explanation :
Refraction is the change in direction of wave propagation due to a change in its transmission medium. Due to the change of medium, the phase velocity of the wave is changed but its frequency remains constant.
[18] The mercury and sodium street lamps light up because of –
A.
Atomic emission
B.
Atomic absorption
C.
Electron emission
D.
Electron absorption
Ans:
Atomic emission
Explanation :
The light in sodium vapour lamp and mercury vapour lamp is, because of electron emission. In case of Sodium Lamps, filaments of the lamp sputter fast moving electrons, which hit the sodium atoms (vapour) causing the valence electrons of the sodium atoms to excite to higher energy levels and the electrons thus excited relax by emitting the characteristic monochromatic bright yellow light.
[19] Instrument for measuring wind velocity is called –
A.
Coulombmeter
B.
Anemometer
C.
Cyanometer
D.
Chronometer
Ans:
Anemometer
Explanation :
An anemometer is an instrument that measures wind speed and wind pressure. Anemometers are important tools for meteorologists, who study weather patterns. The term is derived from the Greek word anemos, which means wind.
[20] Who invented the Lightning Rod in 1749?
A.
Benjamin Franklin
B.
Nikola Tesla
C.
Eli Whitney
D.
George Washington
Ans:
Benjamin Franklin
Explanation :
The principle of the lightning rod was first detailed by Benjamin Franklin in Pennsylvania in 1749. In the subsequent years, he developed his invention for household application (published in 1753) and further improvements towards a reliable system around 1760.
[21] Which of the following has the same unit as energy?
A.
Power
B.
Density
C.
Work
D.
Force
Ans:
Work
Explanation :
The SI unit of work is the joule (J), which is defined as the work expended by a force of one Newton through a displacement of one metre.
[22] The 'Greenhouse effect' is mainly due to increase in atmospheric –
A.
Ozone
B.
Nitrogen
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Carbon dioxide
Explanation :
Carbon dioxide is the primary greenhouse gas that is contributing to recent climate change, 72% of the totally emitted greenhouse gases is carbon dioxide (CO2), 18% Methane and 9% Nitrous oxide (NOx). Carbon dioxide emissions therefore are the most important ca s e of global warming.
[23] Matter waves are –
A.
de Broglie waves
B.
Electromagnetic waves
C.
Transverse waves
D.
Longitudinal waves
Ans:
de Broglie waves
Explanation :
In mechanics, matter waves or de Broglie waves reflects the wave-particle duality of matter. The de Broglie relations show that the wavelength is inversely proportional to the momentum of a particle and is also called de Broglie wavelength.
[24] When the milk is churned vigorously the cream from it is separated out clue to –
A.
Centripetal force
B.
Gravitational force
C.
Frictional force
D.
Centrifugal force
Ans:
Centrifugal force
Explanation :
The separation of cream from milk is based on the fact that when liquids of different specific gravity revolve around the same centre at the same distance with the same velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk consists of two liquids of different specific gravity: fat and milk serum.
[25] The temperature at which the catalytic activity of the catalyst is maximum, is called -
A.
room temperature
B.
critical temperature
C.
absolute temperature
D.
optimum temperature
Ans:
optimum temperature
Explanation :
Some catalysts are, however, physically altered by a rise in temperature and hence their catalytic activity may be decreased. This is particularly true with colloidal solutions like that of platinum, since a rise in the temperature may cause their coagulation. In such a case, the rate of reaction increases up to a certain point and then gradually decreases. The rate of reaction is maximum at a particular temperature; that is Optimum temperature.
Explanation :
Charles Darwin had proposed “theory of Evolution”. The theory of evolution came into view by the reawakening of ancient materialistic philosophies and became widespread in the 19th century. This philosophy supposes that matter is absolute and infinite. This materialistic philosophy does not hold anything to be real except the matter, so it tries to explain the universe and nature through purely material factors.
[14] Which of the following is an insulator?
A.
Mercury
B.
Carbon
C.
Germanium
D.
Glass
Ans:
Glass
Explanation :
Insulators are materials that do not allow the transfer or that slow the transfer of heat or electricity. Some of the examples of insulators are: glass, plastic, rubber, porcelain, wood, ceramic, dry air, etc.
[15] Name the process by which bubbles from liquid are formed?
A.
Effervescence
B.
Surface Tension
C.
Surface Energy
D.
Degasification
Ans:
Effervescence
Explanation :
Effervescence is the escape of gas from an aqueous solution and the foaming or fizzing that results from a release of the gas. It leads to the formation of gas bubbles in a liquid. For example, when opening a bottle of champagne, beer or carbonated beverages such as soft drinks, the visible bubbles are produced by the escape from solution of the dissolved gas.
[16] 'Parsec' is the unit measurement of –
A.
Density of stars
B.
Astronomical distance
C.
Brightness of heavenly bodies
D.
Orbital velocity of giant stars
Ans:
Astronomical distance
Explanation :
Parsec is a unit of distance used in astronomy to measure large distances to objects outside our Solar System. It is equal to about 3.26 light years (3.086 x 1013 kilometres).
[17] The phenomenon of change in direction of light when it passes from one medium to another is called -
A.
Propagation
B.
Reflection
C.
Refraction
D.
Dispersion
Ans:
Refraction
Explanation :
Refraction is the change in direction of wave propagation due to a change in its transmission medium. Due to the change of medium, the phase velocity of the wave is changed but its frequency remains constant.
[18] The mercury and sodium street lamps light up because of –
A.
Atomic emission
B.
Atomic absorption
C.
Electron emission
D.
Electron absorption
Ans:
Atomic emission
Explanation :
The light in sodium vapour lamp and mercury vapour lamp is, because of electron emission. In case of Sodium Lamps, filaments of the lamp sputter fast moving electrons, which hit the sodium atoms (vapour) causing the valence electrons of the sodium atoms to excite to higher energy levels and the electrons thus excited relax by emitting the characteristic monochromatic bright yellow light.
[19] Instrument for measuring wind velocity is called –
A.
Coulombmeter
B.
Anemometer
C.
Cyanometer
D.
Chronometer
Ans:
Anemometer
Explanation :
An anemometer is an instrument that measures wind speed and wind pressure. Anemometers are important tools for meteorologists, who study weather patterns. The term is derived from the Greek word anemos, which means wind.
[20] Who invented the Lightning Rod in 1749?
A.
Benjamin Franklin
B.
Nikola Tesla
C.
Eli Whitney
D.
George Washington
Ans:
Benjamin Franklin
Explanation :
The principle of the lightning rod was first detailed by Benjamin Franklin in Pennsylvania in 1749. In the subsequent years, he developed his invention for household application (published in 1753) and further improvements towards a reliable system around 1760.
[21] Which of the following has the same unit as energy?
A.
Power
B.
Density
C.
Work
D.
Force
Ans:
Work
Explanation :
The SI unit of work is the joule (J), which is defined as the work expended by a force of one Newton through a displacement of one metre.
[22] The 'Greenhouse effect' is mainly due to increase in atmospheric –
A.
Ozone
B.
Nitrogen
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Carbon dioxide
Explanation :
Carbon dioxide is the primary greenhouse gas that is contributing to recent climate change, 72% of the totally emitted greenhouse gases is carbon dioxide (CO2), 18% Methane and 9% Nitrous oxide (NOx). Carbon dioxide emissions therefore are the most important ca s e of global warming.
[23] Matter waves are –
A.
de Broglie waves
B.
Electromagnetic waves
C.
Transverse waves
D.
Longitudinal waves
Ans:
de Broglie waves
Explanation :
In mechanics, matter waves or de Broglie waves reflects the wave-particle duality of matter. The de Broglie relations show that the wavelength is inversely proportional to the momentum of a particle and is also called de Broglie wavelength.
[24] When the milk is churned vigorously the cream from it is separated out clue to –
A.
Centripetal force
B.
Gravitational force
C.
Frictional force
D.
Centrifugal force
Ans:
Centrifugal force
Explanation :
The separation of cream from milk is based on the fact that when liquids of different specific gravity revolve around the same centre at the same distance with the same velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk consists of two liquids of different specific gravity: fat and milk serum.
[25] The temperature at which the catalytic activity of the catalyst is maximum, is called -
A.
room temperature
B.
critical temperature
C.
absolute temperature
D.
optimum temperature
Ans:
optimum temperature
Explanation :
Some catalysts are, however, physically altered by a rise in temperature and hence their catalytic activity may be decreased. This is particularly true with colloidal solutions like that of platinum, since a rise in the temperature may cause their coagulation. In such a case, the rate of reaction increases up to a certain point and then gradually decreases. The rate of reaction is maximum at a particular temperature; that is Optimum temperature.
Explanation :
Effervescence is the escape of gas from an aqueous solution and the foaming or fizzing that results from a release of the gas. It leads to the formation of gas bubbles in a liquid. For example, when opening a bottle of champagne, beer or carbonated beverages such as soft drinks, the visible bubbles are produced by the escape from solution of the dissolved gas.
[16] 'Parsec' is the unit measurement of –
A.
Density of stars
B.
Astronomical distance
C.
Brightness of heavenly bodies
D.
Orbital velocity of giant stars
Ans:
Astronomical distance
Explanation :
Parsec is a unit of distance used in astronomy to measure large distances to objects outside our Solar System. It is equal to about 3.26 light years (3.086 x 1013 kilometres).
[17] The phenomenon of change in direction of light when it passes from one medium to another is called -
A.
Propagation
B.
Reflection
C.
Refraction
D.
Dispersion
Ans:
Refraction
Explanation :
Refraction is the change in direction of wave propagation due to a change in its transmission medium. Due to the change of medium, the phase velocity of the wave is changed but its frequency remains constant.
[18] The mercury and sodium street lamps light up because of –
A.
Atomic emission
B.
Atomic absorption
C.
Electron emission
D.
Electron absorption
Ans:
Atomic emission
Explanation :
The light in sodium vapour lamp and mercury vapour lamp is, because of electron emission. In case of Sodium Lamps, filaments of the lamp sputter fast moving electrons, which hit the sodium atoms (vapour) causing the valence electrons of the sodium atoms to excite to higher energy levels and the electrons thus excited relax by emitting the characteristic monochromatic bright yellow light.
[19] Instrument for measuring wind velocity is called –
A.
Coulombmeter
B.
Anemometer
C.
Cyanometer
D.
Chronometer
Ans:
Anemometer
Explanation :
An anemometer is an instrument that measures wind speed and wind pressure. Anemometers are important tools for meteorologists, who study weather patterns. The term is derived from the Greek word anemos, which means wind.
[20] Who invented the Lightning Rod in 1749?
A.
Benjamin Franklin
B.
Nikola Tesla
C.
Eli Whitney
D.
George Washington
Ans:
Benjamin Franklin
Explanation :
The principle of the lightning rod was first detailed by Benjamin Franklin in Pennsylvania in 1749. In the subsequent years, he developed his invention for household application (published in 1753) and further improvements towards a reliable system around 1760.
[21] Which of the following has the same unit as energy?
A.
Power
B.
Density
C.
Work
D.
Force
Ans:
Work
Explanation :
The SI unit of work is the joule (J), which is defined as the work expended by a force of one Newton through a displacement of one metre.
[22] The 'Greenhouse effect' is mainly due to increase in atmospheric –
A.
Ozone
B.
Nitrogen
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Carbon dioxide
Explanation :
Carbon dioxide is the primary greenhouse gas that is contributing to recent climate change, 72% of the totally emitted greenhouse gases is carbon dioxide (CO2), 18% Methane and 9% Nitrous oxide (NOx). Carbon dioxide emissions therefore are the most important ca s e of global warming.
[23] Matter waves are –
A.
de Broglie waves
B.
Electromagnetic waves
C.
Transverse waves
D.
Longitudinal waves
Ans:
de Broglie waves
Explanation :
In mechanics, matter waves or de Broglie waves reflects the wave-particle duality of matter. The de Broglie relations show that the wavelength is inversely proportional to the momentum of a particle and is also called de Broglie wavelength.
[24] When the milk is churned vigorously the cream from it is separated out clue to –
A.
Centripetal force
B.
Gravitational force
C.
Frictional force
D.
Centrifugal force
Ans:
Centrifugal force
Explanation :
The separation of cream from milk is based on the fact that when liquids of different specific gravity revolve around the same centre at the same distance with the same velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk consists of two liquids of different specific gravity: fat and milk serum.
[25] The temperature at which the catalytic activity of the catalyst is maximum, is called -
A.
room temperature
B.
critical temperature
C.
absolute temperature
D.
optimum temperature
Ans:
optimum temperature
Explanation :
Some catalysts are, however, physically altered by a rise in temperature and hence their catalytic activity may be decreased. This is particularly true with colloidal solutions like that of platinum, since a rise in the temperature may cause their coagulation. In such a case, the rate of reaction increases up to a certain point and then gradually decreases. The rate of reaction is maximum at a particular temperature; that is Optimum temperature.
Explanation :
Refraction is the change in direction of wave propagation due to a change in its transmission medium. Due to the change of medium, the phase velocity of the wave is changed but its frequency remains constant.
[18] The mercury and sodium street lamps light up because of –
A.
Atomic emission
B.
Atomic absorption
C.
Electron emission
D.
Electron absorption
Ans:
Atomic emission
Explanation :
The light in sodium vapour lamp and mercury vapour lamp is, because of electron emission. In case of Sodium Lamps, filaments of the lamp sputter fast moving electrons, which hit the sodium atoms (vapour) causing the valence electrons of the sodium atoms to excite to higher energy levels and the electrons thus excited relax by emitting the characteristic monochromatic bright yellow light.
[19] Instrument for measuring wind velocity is called –
A.
Coulombmeter
B.
Anemometer
C.
Cyanometer
D.
Chronometer
Ans:
Anemometer
Explanation :
An anemometer is an instrument that measures wind speed and wind pressure. Anemometers are important tools for meteorologists, who study weather patterns. The term is derived from the Greek word anemos, which means wind.
[20] Who invented the Lightning Rod in 1749?
A.
Benjamin Franklin
B.
Nikola Tesla
C.
Eli Whitney
D.
George Washington
Ans:
Benjamin Franklin
Explanation :
The principle of the lightning rod was first detailed by Benjamin Franklin in Pennsylvania in 1749. In the subsequent years, he developed his invention for household application (published in 1753) and further improvements towards a reliable system around 1760.
[21] Which of the following has the same unit as energy?
A.
Power
B.
Density
C.
Work
D.
Force
Ans:
Work
Explanation :
The SI unit of work is the joule (J), which is defined as the work expended by a force of one Newton through a displacement of one metre.
[22] The 'Greenhouse effect' is mainly due to increase in atmospheric –
A.
Ozone
B.
Nitrogen
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Carbon dioxide
Explanation :
Carbon dioxide is the primary greenhouse gas that is contributing to recent climate change, 72% of the totally emitted greenhouse gases is carbon dioxide (CO2), 18% Methane and 9% Nitrous oxide (NOx). Carbon dioxide emissions therefore are the most important ca s e of global warming.
[23] Matter waves are –
A.
de Broglie waves
B.
Electromagnetic waves
C.
Transverse waves
D.
Longitudinal waves
Ans:
de Broglie waves
Explanation :
In mechanics, matter waves or de Broglie waves reflects the wave-particle duality of matter. The de Broglie relations show that the wavelength is inversely proportional to the momentum of a particle and is also called de Broglie wavelength.
[24] When the milk is churned vigorously the cream from it is separated out clue to –
A.
Centripetal force
B.
Gravitational force
C.
Frictional force
D.
Centrifugal force
Ans:
Centrifugal force
Explanation :
The separation of cream from milk is based on the fact that when liquids of different specific gravity revolve around the same centre at the same distance with the same velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk consists of two liquids of different specific gravity: fat and milk serum.
[25] The temperature at which the catalytic activity of the catalyst is maximum, is called -
A.
room temperature
B.
critical temperature
C.
absolute temperature
D.
optimum temperature
Ans:
optimum temperature
Explanation :
Some catalysts are, however, physically altered by a rise in temperature and hence their catalytic activity may be decreased. This is particularly true with colloidal solutions like that of platinum, since a rise in the temperature may cause their coagulation. In such a case, the rate of reaction increases up to a certain point and then gradually decreases. The rate of reaction is maximum at a particular temperature; that is Optimum temperature.
Explanation :
An anemometer is an instrument that measures wind speed and wind pressure. Anemometers are important tools for meteorologists, who study weather patterns. The term is derived from the Greek word anemos, which means wind.
[20] Who invented the Lightning Rod in 1749?
A.
Benjamin Franklin
B.
Nikola Tesla
C.
Eli Whitney
D.
George Washington
Ans:
Benjamin Franklin
Explanation :
The principle of the lightning rod was first detailed by Benjamin Franklin in Pennsylvania in 1749. In the subsequent years, he developed his invention for household application (published in 1753) and further improvements towards a reliable system around 1760.
[21] Which of the following has the same unit as energy?
A.
Power
B.
Density
C.
Work
D.
Force
Ans:
Work
Explanation :
The SI unit of work is the joule (J), which is defined as the work expended by a force of one Newton through a displacement of one metre.
[22] The 'Greenhouse effect' is mainly due to increase in atmospheric –
A.
Ozone
B.
Nitrogen
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Carbon dioxide
Explanation :
Carbon dioxide is the primary greenhouse gas that is contributing to recent climate change, 72% of the totally emitted greenhouse gases is carbon dioxide (CO2), 18% Methane and 9% Nitrous oxide (NOx). Carbon dioxide emissions therefore are the most important ca s e of global warming.
[23] Matter waves are –
A.
de Broglie waves
B.
Electromagnetic waves
C.
Transverse waves
D.
Longitudinal waves
Ans:
de Broglie waves
Explanation :
In mechanics, matter waves or de Broglie waves reflects the wave-particle duality of matter. The de Broglie relations show that the wavelength is inversely proportional to the momentum of a particle and is also called de Broglie wavelength.
[24] When the milk is churned vigorously the cream from it is separated out clue to –
A.
Centripetal force
B.
Gravitational force
C.
Frictional force
D.
Centrifugal force
Ans:
Centrifugal force
Explanation :
The separation of cream from milk is based on the fact that when liquids of different specific gravity revolve around the same centre at the same distance with the same velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk consists of two liquids of different specific gravity: fat and milk serum.
[25] The temperature at which the catalytic activity of the catalyst is maximum, is called -
A.
room temperature
B.
critical temperature
C.
absolute temperature
D.
optimum temperature
Ans:
optimum temperature
Explanation :
Some catalysts are, however, physically altered by a rise in temperature and hence their catalytic activity may be decreased. This is particularly true with colloidal solutions like that of platinum, since a rise in the temperature may cause their coagulation. In such a case, the rate of reaction increases up to a certain point and then gradually decreases. The rate of reaction is maximum at a particular temperature; that is Optimum temperature.
Explanation :
The SI unit of work is the joule (J), which is defined as the work expended by a force of one Newton through a displacement of one metre.
[22] The 'Greenhouse effect' is mainly due to increase in atmospheric –
A.
Ozone
B.
Nitrogen
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Carbon dioxide
Explanation :
Carbon dioxide is the primary greenhouse gas that is contributing to recent climate change, 72% of the totally emitted greenhouse gases is carbon dioxide (CO2), 18% Methane and 9% Nitrous oxide (NOx). Carbon dioxide emissions therefore are the most important ca s e of global warming.
[23] Matter waves are –
A.
de Broglie waves
B.
Electromagnetic waves
C.
Transverse waves
D.
Longitudinal waves
Ans:
de Broglie waves
Explanation :
In mechanics, matter waves or de Broglie waves reflects the wave-particle duality of matter. The de Broglie relations show that the wavelength is inversely proportional to the momentum of a particle and is also called de Broglie wavelength.
[24] When the milk is churned vigorously the cream from it is separated out clue to –
A.
Centripetal force
B.
Gravitational force
C.
Frictional force
D.
Centrifugal force
Ans:
Centrifugal force
Explanation :
The separation of cream from milk is based on the fact that when liquids of different specific gravity revolve around the same centre at the same distance with the same velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk consists of two liquids of different specific gravity: fat and milk serum.
[25] The temperature at which the catalytic activity of the catalyst is maximum, is called -
A.
room temperature
B.
critical temperature
C.
absolute temperature
D.
optimum temperature
Ans:
optimum temperature
Explanation :
Some catalysts are, however, physically altered by a rise in temperature and hence their catalytic activity may be decreased. This is particularly true with colloidal solutions like that of platinum, since a rise in the temperature may cause their coagulation. In such a case, the rate of reaction increases up to a certain point and then gradually decreases. The rate of reaction is maximum at a particular temperature; that is Optimum temperature.
Explanation :
In mechanics, matter waves or de Broglie waves reflects the wave-particle duality of matter. The de Broglie relations show that the wavelength is inversely proportional to the momentum of a particle and is also called de Broglie wavelength.
[24] When the milk is churned vigorously the cream from it is separated out clue to –
A.
Centripetal force
B.
Gravitational force
C.
Frictional force
D.
Centrifugal force
Ans:
Centrifugal force
Explanation :
The separation of cream from milk is based on the fact that when liquids of different specific gravity revolve around the same centre at the same distance with the same velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk consists of two liquids of different specific gravity: fat and milk serum.
[25] The temperature at which the catalytic activity of the catalyst is maximum, is called -
A.
room temperature
B.
critical temperature
C.
absolute temperature
D.
optimum temperature
Ans:
optimum temperature
Explanation :
Some catalysts are, however, physically altered by a rise in temperature and hence their catalytic activity may be decreased. This is particularly true with colloidal solutions like that of platinum, since a rise in the temperature may cause their coagulation. In such a case, the rate of reaction increases up to a certain point and then gradually decreases. The rate of reaction is maximum at a particular temperature; that is Optimum temperature.
Explanation :
Some catalysts are, however, physically altered by a rise in temperature and hence their catalytic activity may be decreased. This is particularly true with colloidal solutions like that of platinum, since a rise in the temperature may cause their coagulation. In such a case, the rate of reaction increases up to a certain point and then gradually decreases. The rate of reaction is maximum at a particular temperature; that is Optimum temperature.