[1] Which one among the following substances evolved heat when dissolved in water?
A.
Glucose
B.
Fructose
C.
Quick lime
D.
Salt peter
Ans:
Quick lime
Explanation :
Quicklime is a widely used chemical compound. It is a white, caustic, alkaline, crystalline solid at room temperature. When limestone is heated, at about 1000° C it undergoes thermal decomposition.
[2] In the remote control of television, electromagnetic waves used are –
A.
ultraviolet
B.
microwave
C.
radiowave
D.
infrared
Ans:
infrared
Explanation :
All electromagnetic waves used are infrared.
[3] Of the following properties of a wave, the one that is independent of the other is its -
A.
amplitude
B.
velocity
C.
wavelength
D.
frequency
Ans:
amplitude
Explanation :
The maximum extent of a vibration or oscillation, measured from the position of equilibrium. We know that velocity of wave (v) = frequency (f)× wavelength (λ). Thus, we can say that the amplitude (A) is independent of other means it is not related to the other quantities.
[4] Heat flows as a result of difference of _.
A.
Temperature
B.
Density
C.
mass
D.
Volume
Ans:
Temperature
Explanation :
Heat flow moves energy from a higher temperature to a lower temperature. The bigger the difference in temperature between two objects, the faster heat flows between them.
[5] Sound and light waves both _.
A.
have similar wavelength
B.
obey the laws of reflection
C.
travel as longitudinal waves
D.
travel through vacuum
Ans:
obey the laws of reflection
Explanation :
The two laws of reflection of light are applicable to sound waves as well. The incident wave, the normal to the reflecting surface and the reflected wave at the point of incidence lie in the same plane.
[6] Radioactive elements can be traced out in living cell through a technique called –
A.
Centrifugation
B.
Chromatography
C.
Auto radiography
D.
All the above
Ans:
Auto radiography
Explanation :
Radioactive elements can be traced out in living cell through a technique called Autoradiography.
[7] Human beings can hear the sound range between:
A.
10 to 20 decibels
B.
100 to 150 decibels
C.
50 to 60 decibels
D.
None of the above
Ans:
None of the above
Explanation :
The most accepted sound range of human being is 0 to 120 decibels.
[8] Solids which conduct electricity at higher temperature but not at lower temperature are called –
A.
super-conductor
B.
metallic-conductor
C.
semi-conductor
D.
insulator
Ans:
semi-conductor
Explanation :
Semiconductors are insulators at low temperatures and reasonably good conductors at higher temperatures. As temperature increases, the semiconductor material becomes a better and better conductor.
[9] In a filament type light bulb most of the electric power consumed appears as –
A.
visible light
B.
infra-red rays
C.
ultra-violet rays
D.
fluorescent light
Ans:
infra-red rays
Explanation :
When electricity is passed through the filament, the filament gets hot. Depending on the temperature of the filament, radiation is emitted from the filament. The filament's temperature is very high, generally over 2,000°C. At this high temperature of 2,000°C, about 5 percent of the electrical energy converts into visible light and rest of it is emitted as heat or infrared radiation.
[10] Which one of the following is not a Major Abiotic Factors?
A.
Temperature
B.
Water
C.
Light
D.
Air
Ans:
Air
Explanation :
Major abiotic factors include water, sunlight, oxygen, soil and temperature.
[11] Optical fibre works on the principle of –
A.
refraction
B.
scattering
C.
interference
D.
total internal reflection
Ans:
total internal reflection
Explanation :
Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.
[12] The colours of stars depend on their –
A.
temperature
B.
distance
C.
radius
D.
atmospheric pressure
Ans:
temperature
Explanation :
The colour of a star tells about its temperature, and the temperature depends on some combination of the star's mass and evolutionary phase.
[13] Water has maximum density at –
A.
100°C
B.
0°C
C.
4°C
D.
273°C
Ans:
4°C
Explanation :
The maximum density of water occurs at 4 °C because at this temperature, two opposing effects are in balance. Water is an exceptional compound that has a lower density in the solid phase than the liquid phase (i.e., ice floats on water). This is actually due to the ion nature of water in the liquid phase, which packs the molecules tightly together.
[14] Which of the following colour of light deviates least through the prism?
A.
yellow
B.
green
C.
violet
D.
red
Ans:
red
Explanation :
In refracting media like glass prism, water, etc., lights of different colors travel with different speeds. The speed of violet colour is the least, while the speed of red colour is the largest in prism. As a result, the refractive index of glass is largest for violet colour and least for red colour. So the violet colour is deviated the most, while red colour is deviated least on passing through the prism.
[15] Hydraulic brakes work on the principle of –
A.
Thomson's law
B.
Newton's law
C.
Bernoulli's theorem
D.
Pascal's law
Ans:
Pascal's law
Explanation :
Hydraulic brake works on Pascal's law which states that pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such that the pressure variations remain the same.
[16] X- rays are waves.
A.
Longitudinal
B.
Transverse
C.
Electromagnetic
D.
Elastic
Ans:
Electromagnetic
Explanation :
X-rays are a form of electromagnetic radiation as are radio waves.
[17] Which planet is nearest to the sun?
A.
Earth
B.
Jupiter
C.
Mercury
D.
Mars
Ans:
Jupiter
Explanation :
At an average distance of only 57.9 million km, Mercury orbits closer to the Sun than any other planet. Mercury takes only 88 days to complete an orbit around the Sun.
[18] The moon that we see in the sky is a .
A.
Planet
B.
Star
C.
Sun
D.
Satellite
Ans:
Satellite
Explanation :
The moon that we see in the sky is a satellite. It is a companion of our earth and moves round it. Like our earth, there are eight other planets that get heat and light from the sun.
[19] The absolute zero is a temperature at which _.
A.
molecular motion in a gas would cease
B.
water freezes
C.
all gases become liquid
D.
all gases become solid
Ans:
molecular motion in a gas would cease
Explanation :
Absolute zero is the lowest possible temperature where nothing could be colder and no heat energy remains in a substance. It is the point at which all motion in matter stops.
[20] The term "infrasonic" applied to sound refers to sound waves below -
A.
200 Hz
B.
20000 Hz
C.
20 Hz
D.
0 Hz
Ans:
20 Hz
Explanation :
The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound, and nominally includes anything under 20Hz.
[21] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states that?
A.
Newton’s first law
B.
Newton’s Second Law
C.
Newton’s Third Law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Conservation of linear momentum. The principle that the linear momentum of a system has constant magnitude and direction if the system is subjected to no external force. Also called law of conservation of linear momentum
[22] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[23] A body moving in a circular path with a constant speed has a –
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path.
[24] The Solar energy produced by –
A.
Fusion reaction
B.
Fission reaction
C.
Combustion reaction
D.
None
Ans:
Fusion reaction
Explanation :
The Sun is amain-sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, the Sun fuses 620 million metric tons of hydrogen each second. Fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new nucleus.
[25] In which form is the supplied heat energy stored during change in temperature of substance?
A.
Heat energy
B.
Kinetic energy
C.
Potential energy
D.
Both kinetic and potential energy
Ans:
Kinetic energy
Explanation :
Temperature is used as a measure for heat in an object by measuring the amount of kinetic energy in the molecules that make up the object. It is a measure of the average kinetic energy of the random molecular motion. Heat is a form of energy that can be transferred from the heat source to the molecules, and it can also change its form from heat to movement.
Explanation :
Quicklime is a widely used chemical compound. It is a white, caustic, alkaline, crystalline solid at room temperature. When limestone is heated, at about 1000° C it undergoes thermal decomposition.
[2] In the remote control of television, electromagnetic waves used are –
A.
ultraviolet
B.
microwave
C.
radiowave
D.
infrared
Ans:
infrared
Explanation :
All electromagnetic waves used are infrared.
[3] Of the following properties of a wave, the one that is independent of the other is its -
A.
amplitude
B.
velocity
C.
wavelength
D.
frequency
Ans:
amplitude
Explanation :
The maximum extent of a vibration or oscillation, measured from the position of equilibrium. We know that velocity of wave (v) = frequency (f)× wavelength (λ). Thus, we can say that the amplitude (A) is independent of other means it is not related to the other quantities.
[4] Heat flows as a result of difference of _.
A.
Temperature
B.
Density
C.
mass
D.
Volume
Ans:
Temperature
Explanation :
Heat flow moves energy from a higher temperature to a lower temperature. The bigger the difference in temperature between two objects, the faster heat flows between them.
[5] Sound and light waves both _.
A.
have similar wavelength
B.
obey the laws of reflection
C.
travel as longitudinal waves
D.
travel through vacuum
Ans:
obey the laws of reflection
Explanation :
The two laws of reflection of light are applicable to sound waves as well. The incident wave, the normal to the reflecting surface and the reflected wave at the point of incidence lie in the same plane.
[6] Radioactive elements can be traced out in living cell through a technique called –
A.
Centrifugation
B.
Chromatography
C.
Auto radiography
D.
All the above
Ans:
Auto radiography
Explanation :
Radioactive elements can be traced out in living cell through a technique called Autoradiography.
[7] Human beings can hear the sound range between:
A.
10 to 20 decibels
B.
100 to 150 decibels
C.
50 to 60 decibels
D.
None of the above
Ans:
None of the above
Explanation :
The most accepted sound range of human being is 0 to 120 decibels.
[8] Solids which conduct electricity at higher temperature but not at lower temperature are called –
A.
super-conductor
B.
metallic-conductor
C.
semi-conductor
D.
insulator
Ans:
semi-conductor
Explanation :
Semiconductors are insulators at low temperatures and reasonably good conductors at higher temperatures. As temperature increases, the semiconductor material becomes a better and better conductor.
[9] In a filament type light bulb most of the electric power consumed appears as –
A.
visible light
B.
infra-red rays
C.
ultra-violet rays
D.
fluorescent light
Ans:
infra-red rays
Explanation :
When electricity is passed through the filament, the filament gets hot. Depending on the temperature of the filament, radiation is emitted from the filament. The filament's temperature is very high, generally over 2,000°C. At this high temperature of 2,000°C, about 5 percent of the electrical energy converts into visible light and rest of it is emitted as heat or infrared radiation.
[10] Which one of the following is not a Major Abiotic Factors?
A.
Temperature
B.
Water
C.
Light
D.
Air
Ans:
Air
Explanation :
Major abiotic factors include water, sunlight, oxygen, soil and temperature.
[11] Optical fibre works on the principle of –
A.
refraction
B.
scattering
C.
interference
D.
total internal reflection
Ans:
total internal reflection
Explanation :
Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.
[12] The colours of stars depend on their –
A.
temperature
B.
distance
C.
radius
D.
atmospheric pressure
Ans:
temperature
Explanation :
The colour of a star tells about its temperature, and the temperature depends on some combination of the star's mass and evolutionary phase.
[13] Water has maximum density at –
A.
100°C
B.
0°C
C.
4°C
D.
273°C
Ans:
4°C
Explanation :
The maximum density of water occurs at 4 °C because at this temperature, two opposing effects are in balance. Water is an exceptional compound that has a lower density in the solid phase than the liquid phase (i.e., ice floats on water). This is actually due to the ion nature of water in the liquid phase, which packs the molecules tightly together.
[14] Which of the following colour of light deviates least through the prism?
A.
yellow
B.
green
C.
violet
D.
red
Ans:
red
Explanation :
In refracting media like glass prism, water, etc., lights of different colors travel with different speeds. The speed of violet colour is the least, while the speed of red colour is the largest in prism. As a result, the refractive index of glass is largest for violet colour and least for red colour. So the violet colour is deviated the most, while red colour is deviated least on passing through the prism.
[15] Hydraulic brakes work on the principle of –
A.
Thomson's law
B.
Newton's law
C.
Bernoulli's theorem
D.
Pascal's law
Ans:
Pascal's law
Explanation :
Hydraulic brake works on Pascal's law which states that pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such that the pressure variations remain the same.
[16] X- rays are waves.
A.
Longitudinal
B.
Transverse
C.
Electromagnetic
D.
Elastic
Ans:
Electromagnetic
Explanation :
X-rays are a form of electromagnetic radiation as are radio waves.
[17] Which planet is nearest to the sun?
A.
Earth
B.
Jupiter
C.
Mercury
D.
Mars
Ans:
Jupiter
Explanation :
At an average distance of only 57.9 million km, Mercury orbits closer to the Sun than any other planet. Mercury takes only 88 days to complete an orbit around the Sun.
[18] The moon that we see in the sky is a .
A.
Planet
B.
Star
C.
Sun
D.
Satellite
Ans:
Satellite
Explanation :
The moon that we see in the sky is a satellite. It is a companion of our earth and moves round it. Like our earth, there are eight other planets that get heat and light from the sun.
[19] The absolute zero is a temperature at which _.
A.
molecular motion in a gas would cease
B.
water freezes
C.
all gases become liquid
D.
all gases become solid
Ans:
molecular motion in a gas would cease
Explanation :
Absolute zero is the lowest possible temperature where nothing could be colder and no heat energy remains in a substance. It is the point at which all motion in matter stops.
[20] The term "infrasonic" applied to sound refers to sound waves below -
A.
200 Hz
B.
20000 Hz
C.
20 Hz
D.
0 Hz
Ans:
20 Hz
Explanation :
The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound, and nominally includes anything under 20Hz.
[21] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states that?
A.
Newton’s first law
B.
Newton’s Second Law
C.
Newton’s Third Law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Conservation of linear momentum. The principle that the linear momentum of a system has constant magnitude and direction if the system is subjected to no external force. Also called law of conservation of linear momentum
[22] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[23] A body moving in a circular path with a constant speed has a –
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path.
[24] The Solar energy produced by –
A.
Fusion reaction
B.
Fission reaction
C.
Combustion reaction
D.
None
Ans:
Fusion reaction
Explanation :
The Sun is amain-sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, the Sun fuses 620 million metric tons of hydrogen each second. Fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new nucleus.
[25] In which form is the supplied heat energy stored during change in temperature of substance?
A.
Heat energy
B.
Kinetic energy
C.
Potential energy
D.
Both kinetic and potential energy
Ans:
Kinetic energy
Explanation :
Temperature is used as a measure for heat in an object by measuring the amount of kinetic energy in the molecules that make up the object. It is a measure of the average kinetic energy of the random molecular motion. Heat is a form of energy that can be transferred from the heat source to the molecules, and it can also change its form from heat to movement.
Explanation :
The maximum extent of a vibration or oscillation, measured from the position of equilibrium. We know that velocity of wave (v) = frequency (f)× wavelength (λ). Thus, we can say that the amplitude (A) is independent of other means it is not related to the other quantities.
[4] Heat flows as a result of difference of _.
A.
Temperature
B.
Density
C.
mass
D.
Volume
Ans:
Temperature
Explanation :
Heat flow moves energy from a higher temperature to a lower temperature. The bigger the difference in temperature between two objects, the faster heat flows between them.
[5] Sound and light waves both _.
A.
have similar wavelength
B.
obey the laws of reflection
C.
travel as longitudinal waves
D.
travel through vacuum
Ans:
obey the laws of reflection
Explanation :
The two laws of reflection of light are applicable to sound waves as well. The incident wave, the normal to the reflecting surface and the reflected wave at the point of incidence lie in the same plane.
[6] Radioactive elements can be traced out in living cell through a technique called –
A.
Centrifugation
B.
Chromatography
C.
Auto radiography
D.
All the above
Ans:
Auto radiography
Explanation :
Radioactive elements can be traced out in living cell through a technique called Autoradiography.
[7] Human beings can hear the sound range between:
A.
10 to 20 decibels
B.
100 to 150 decibels
C.
50 to 60 decibels
D.
None of the above
Ans:
None of the above
Explanation :
The most accepted sound range of human being is 0 to 120 decibels.
[8] Solids which conduct electricity at higher temperature but not at lower temperature are called –
A.
super-conductor
B.
metallic-conductor
C.
semi-conductor
D.
insulator
Ans:
semi-conductor
Explanation :
Semiconductors are insulators at low temperatures and reasonably good conductors at higher temperatures. As temperature increases, the semiconductor material becomes a better and better conductor.
[9] In a filament type light bulb most of the electric power consumed appears as –
A.
visible light
B.
infra-red rays
C.
ultra-violet rays
D.
fluorescent light
Ans:
infra-red rays
Explanation :
When electricity is passed through the filament, the filament gets hot. Depending on the temperature of the filament, radiation is emitted from the filament. The filament's temperature is very high, generally over 2,000°C. At this high temperature of 2,000°C, about 5 percent of the electrical energy converts into visible light and rest of it is emitted as heat or infrared radiation.
[10] Which one of the following is not a Major Abiotic Factors?
A.
Temperature
B.
Water
C.
Light
D.
Air
Ans:
Air
Explanation :
Major abiotic factors include water, sunlight, oxygen, soil and temperature.
[11] Optical fibre works on the principle of –
A.
refraction
B.
scattering
C.
interference
D.
total internal reflection
Ans:
total internal reflection
Explanation :
Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.
[12] The colours of stars depend on their –
A.
temperature
B.
distance
C.
radius
D.
atmospheric pressure
Ans:
temperature
Explanation :
The colour of a star tells about its temperature, and the temperature depends on some combination of the star's mass and evolutionary phase.
[13] Water has maximum density at –
A.
100°C
B.
0°C
C.
4°C
D.
273°C
Ans:
4°C
Explanation :
The maximum density of water occurs at 4 °C because at this temperature, two opposing effects are in balance. Water is an exceptional compound that has a lower density in the solid phase than the liquid phase (i.e., ice floats on water). This is actually due to the ion nature of water in the liquid phase, which packs the molecules tightly together.
[14] Which of the following colour of light deviates least through the prism?
A.
yellow
B.
green
C.
violet
D.
red
Ans:
red
Explanation :
In refracting media like glass prism, water, etc., lights of different colors travel with different speeds. The speed of violet colour is the least, while the speed of red colour is the largest in prism. As a result, the refractive index of glass is largest for violet colour and least for red colour. So the violet colour is deviated the most, while red colour is deviated least on passing through the prism.
[15] Hydraulic brakes work on the principle of –
A.
Thomson's law
B.
Newton's law
C.
Bernoulli's theorem
D.
Pascal's law
Ans:
Pascal's law
Explanation :
Hydraulic brake works on Pascal's law which states that pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such that the pressure variations remain the same.
[16] X- rays are waves.
A.
Longitudinal
B.
Transverse
C.
Electromagnetic
D.
Elastic
Ans:
Electromagnetic
Explanation :
X-rays are a form of electromagnetic radiation as are radio waves.
[17] Which planet is nearest to the sun?
A.
Earth
B.
Jupiter
C.
Mercury
D.
Mars
Ans:
Jupiter
Explanation :
At an average distance of only 57.9 million km, Mercury orbits closer to the Sun than any other planet. Mercury takes only 88 days to complete an orbit around the Sun.
[18] The moon that we see in the sky is a .
A.
Planet
B.
Star
C.
Sun
D.
Satellite
Ans:
Satellite
Explanation :
The moon that we see in the sky is a satellite. It is a companion of our earth and moves round it. Like our earth, there are eight other planets that get heat and light from the sun.
[19] The absolute zero is a temperature at which _.
A.
molecular motion in a gas would cease
B.
water freezes
C.
all gases become liquid
D.
all gases become solid
Ans:
molecular motion in a gas would cease
Explanation :
Absolute zero is the lowest possible temperature where nothing could be colder and no heat energy remains in a substance. It is the point at which all motion in matter stops.
[20] The term "infrasonic" applied to sound refers to sound waves below -
A.
200 Hz
B.
20000 Hz
C.
20 Hz
D.
0 Hz
Ans:
20 Hz
Explanation :
The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound, and nominally includes anything under 20Hz.
[21] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states that?
A.
Newton’s first law
B.
Newton’s Second Law
C.
Newton’s Third Law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Conservation of linear momentum. The principle that the linear momentum of a system has constant magnitude and direction if the system is subjected to no external force. Also called law of conservation of linear momentum
[22] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[23] A body moving in a circular path with a constant speed has a –
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path.
[24] The Solar energy produced by –
A.
Fusion reaction
B.
Fission reaction
C.
Combustion reaction
D.
None
Ans:
Fusion reaction
Explanation :
The Sun is amain-sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, the Sun fuses 620 million metric tons of hydrogen each second. Fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new nucleus.
[25] In which form is the supplied heat energy stored during change in temperature of substance?
A.
Heat energy
B.
Kinetic energy
C.
Potential energy
D.
Both kinetic and potential energy
Ans:
Kinetic energy
Explanation :
Temperature is used as a measure for heat in an object by measuring the amount of kinetic energy in the molecules that make up the object. It is a measure of the average kinetic energy of the random molecular motion. Heat is a form of energy that can be transferred from the heat source to the molecules, and it can also change its form from heat to movement.
Explanation :
The two laws of reflection of light are applicable to sound waves as well. The incident wave, the normal to the reflecting surface and the reflected wave at the point of incidence lie in the same plane.
[6] Radioactive elements can be traced out in living cell through a technique called –
A.
Centrifugation
B.
Chromatography
C.
Auto radiography
D.
All the above
Ans:
Auto radiography
Explanation :
Radioactive elements can be traced out in living cell through a technique called Autoradiography.
[7] Human beings can hear the sound range between:
A.
10 to 20 decibels
B.
100 to 150 decibels
C.
50 to 60 decibels
D.
None of the above
Ans:
None of the above
Explanation :
The most accepted sound range of human being is 0 to 120 decibels.
[8] Solids which conduct electricity at higher temperature but not at lower temperature are called –
A.
super-conductor
B.
metallic-conductor
C.
semi-conductor
D.
insulator
Ans:
semi-conductor
Explanation :
Semiconductors are insulators at low temperatures and reasonably good conductors at higher temperatures. As temperature increases, the semiconductor material becomes a better and better conductor.
[9] In a filament type light bulb most of the electric power consumed appears as –
A.
visible light
B.
infra-red rays
C.
ultra-violet rays
D.
fluorescent light
Ans:
infra-red rays
Explanation :
When electricity is passed through the filament, the filament gets hot. Depending on the temperature of the filament, radiation is emitted from the filament. The filament's temperature is very high, generally over 2,000°C. At this high temperature of 2,000°C, about 5 percent of the electrical energy converts into visible light and rest of it is emitted as heat or infrared radiation.
[10] Which one of the following is not a Major Abiotic Factors?
A.
Temperature
B.
Water
C.
Light
D.
Air
Ans:
Air
Explanation :
Major abiotic factors include water, sunlight, oxygen, soil and temperature.
[11] Optical fibre works on the principle of –
A.
refraction
B.
scattering
C.
interference
D.
total internal reflection
Ans:
total internal reflection
Explanation :
Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.
[12] The colours of stars depend on their –
A.
temperature
B.
distance
C.
radius
D.
atmospheric pressure
Ans:
temperature
Explanation :
The colour of a star tells about its temperature, and the temperature depends on some combination of the star's mass and evolutionary phase.
[13] Water has maximum density at –
A.
100°C
B.
0°C
C.
4°C
D.
273°C
Ans:
4°C
Explanation :
The maximum density of water occurs at 4 °C because at this temperature, two opposing effects are in balance. Water is an exceptional compound that has a lower density in the solid phase than the liquid phase (i.e., ice floats on water). This is actually due to the ion nature of water in the liquid phase, which packs the molecules tightly together.
[14] Which of the following colour of light deviates least through the prism?
A.
yellow
B.
green
C.
violet
D.
red
Ans:
red
Explanation :
In refracting media like glass prism, water, etc., lights of different colors travel with different speeds. The speed of violet colour is the least, while the speed of red colour is the largest in prism. As a result, the refractive index of glass is largest for violet colour and least for red colour. So the violet colour is deviated the most, while red colour is deviated least on passing through the prism.
[15] Hydraulic brakes work on the principle of –
A.
Thomson's law
B.
Newton's law
C.
Bernoulli's theorem
D.
Pascal's law
Ans:
Pascal's law
Explanation :
Hydraulic brake works on Pascal's law which states that pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such that the pressure variations remain the same.
[16] X- rays are waves.
A.
Longitudinal
B.
Transverse
C.
Electromagnetic
D.
Elastic
Ans:
Electromagnetic
Explanation :
X-rays are a form of electromagnetic radiation as are radio waves.
[17] Which planet is nearest to the sun?
A.
Earth
B.
Jupiter
C.
Mercury
D.
Mars
Ans:
Jupiter
Explanation :
At an average distance of only 57.9 million km, Mercury orbits closer to the Sun than any other planet. Mercury takes only 88 days to complete an orbit around the Sun.
[18] The moon that we see in the sky is a .
A.
Planet
B.
Star
C.
Sun
D.
Satellite
Ans:
Satellite
Explanation :
The moon that we see in the sky is a satellite. It is a companion of our earth and moves round it. Like our earth, there are eight other planets that get heat and light from the sun.
[19] The absolute zero is a temperature at which _.
A.
molecular motion in a gas would cease
B.
water freezes
C.
all gases become liquid
D.
all gases become solid
Ans:
molecular motion in a gas would cease
Explanation :
Absolute zero is the lowest possible temperature where nothing could be colder and no heat energy remains in a substance. It is the point at which all motion in matter stops.
[20] The term "infrasonic" applied to sound refers to sound waves below -
A.
200 Hz
B.
20000 Hz
C.
20 Hz
D.
0 Hz
Ans:
20 Hz
Explanation :
The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound, and nominally includes anything under 20Hz.
[21] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states that?
A.
Newton’s first law
B.
Newton’s Second Law
C.
Newton’s Third Law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Conservation of linear momentum. The principle that the linear momentum of a system has constant magnitude and direction if the system is subjected to no external force. Also called law of conservation of linear momentum
[22] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[23] A body moving in a circular path with a constant speed has a –
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path.
[24] The Solar energy produced by –
A.
Fusion reaction
B.
Fission reaction
C.
Combustion reaction
D.
None
Ans:
Fusion reaction
Explanation :
The Sun is amain-sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, the Sun fuses 620 million metric tons of hydrogen each second. Fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new nucleus.
[25] In which form is the supplied heat energy stored during change in temperature of substance?
A.
Heat energy
B.
Kinetic energy
C.
Potential energy
D.
Both kinetic and potential energy
Ans:
Kinetic energy
Explanation :
Temperature is used as a measure for heat in an object by measuring the amount of kinetic energy in the molecules that make up the object. It is a measure of the average kinetic energy of the random molecular motion. Heat is a form of energy that can be transferred from the heat source to the molecules, and it can also change its form from heat to movement.
Explanation :
The most accepted sound range of human being is 0 to 120 decibels.
[8] Solids which conduct electricity at higher temperature but not at lower temperature are called –
A.
super-conductor
B.
metallic-conductor
C.
semi-conductor
D.
insulator
Ans:
semi-conductor
Explanation :
Semiconductors are insulators at low temperatures and reasonably good conductors at higher temperatures. As temperature increases, the semiconductor material becomes a better and better conductor.
[9] In a filament type light bulb most of the electric power consumed appears as –
A.
visible light
B.
infra-red rays
C.
ultra-violet rays
D.
fluorescent light
Ans:
infra-red rays
Explanation :
When electricity is passed through the filament, the filament gets hot. Depending on the temperature of the filament, radiation is emitted from the filament. The filament's temperature is very high, generally over 2,000°C. At this high temperature of 2,000°C, about 5 percent of the electrical energy converts into visible light and rest of it is emitted as heat or infrared radiation.
[10] Which one of the following is not a Major Abiotic Factors?
A.
Temperature
B.
Water
C.
Light
D.
Air
Ans:
Air
Explanation :
Major abiotic factors include water, sunlight, oxygen, soil and temperature.
[11] Optical fibre works on the principle of –
A.
refraction
B.
scattering
C.
interference
D.
total internal reflection
Ans:
total internal reflection
Explanation :
Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.
[12] The colours of stars depend on their –
A.
temperature
B.
distance
C.
radius
D.
atmospheric pressure
Ans:
temperature
Explanation :
The colour of a star tells about its temperature, and the temperature depends on some combination of the star's mass and evolutionary phase.
[13] Water has maximum density at –
A.
100°C
B.
0°C
C.
4°C
D.
273°C
Ans:
4°C
Explanation :
The maximum density of water occurs at 4 °C because at this temperature, two opposing effects are in balance. Water is an exceptional compound that has a lower density in the solid phase than the liquid phase (i.e., ice floats on water). This is actually due to the ion nature of water in the liquid phase, which packs the molecules tightly together.
[14] Which of the following colour of light deviates least through the prism?
A.
yellow
B.
green
C.
violet
D.
red
Ans:
red
Explanation :
In refracting media like glass prism, water, etc., lights of different colors travel with different speeds. The speed of violet colour is the least, while the speed of red colour is the largest in prism. As a result, the refractive index of glass is largest for violet colour and least for red colour. So the violet colour is deviated the most, while red colour is deviated least on passing through the prism.
[15] Hydraulic brakes work on the principle of –
A.
Thomson's law
B.
Newton's law
C.
Bernoulli's theorem
D.
Pascal's law
Ans:
Pascal's law
Explanation :
Hydraulic brake works on Pascal's law which states that pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such that the pressure variations remain the same.
[16] X- rays are waves.
A.
Longitudinal
B.
Transverse
C.
Electromagnetic
D.
Elastic
Ans:
Electromagnetic
Explanation :
X-rays are a form of electromagnetic radiation as are radio waves.
[17] Which planet is nearest to the sun?
A.
Earth
B.
Jupiter
C.
Mercury
D.
Mars
Ans:
Jupiter
Explanation :
At an average distance of only 57.9 million km, Mercury orbits closer to the Sun than any other planet. Mercury takes only 88 days to complete an orbit around the Sun.
[18] The moon that we see in the sky is a .
A.
Planet
B.
Star
C.
Sun
D.
Satellite
Ans:
Satellite
Explanation :
The moon that we see in the sky is a satellite. It is a companion of our earth and moves round it. Like our earth, there are eight other planets that get heat and light from the sun.
[19] The absolute zero is a temperature at which _.
A.
molecular motion in a gas would cease
B.
water freezes
C.
all gases become liquid
D.
all gases become solid
Ans:
molecular motion in a gas would cease
Explanation :
Absolute zero is the lowest possible temperature where nothing could be colder and no heat energy remains in a substance. It is the point at which all motion in matter stops.
[20] The term "infrasonic" applied to sound refers to sound waves below -
A.
200 Hz
B.
20000 Hz
C.
20 Hz
D.
0 Hz
Ans:
20 Hz
Explanation :
The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound, and nominally includes anything under 20Hz.
[21] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states that?
A.
Newton’s first law
B.
Newton’s Second Law
C.
Newton’s Third Law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Conservation of linear momentum. The principle that the linear momentum of a system has constant magnitude and direction if the system is subjected to no external force. Also called law of conservation of linear momentum
[22] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[23] A body moving in a circular path with a constant speed has a –
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path.
[24] The Solar energy produced by –
A.
Fusion reaction
B.
Fission reaction
C.
Combustion reaction
D.
None
Ans:
Fusion reaction
Explanation :
The Sun is amain-sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, the Sun fuses 620 million metric tons of hydrogen each second. Fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new nucleus.
[25] In which form is the supplied heat energy stored during change in temperature of substance?
A.
Heat energy
B.
Kinetic energy
C.
Potential energy
D.
Both kinetic and potential energy
Ans:
Kinetic energy
Explanation :
Temperature is used as a measure for heat in an object by measuring the amount of kinetic energy in the molecules that make up the object. It is a measure of the average kinetic energy of the random molecular motion. Heat is a form of energy that can be transferred from the heat source to the molecules, and it can also change its form from heat to movement.
Explanation :
When electricity is passed through the filament, the filament gets hot. Depending on the temperature of the filament, radiation is emitted from the filament. The filament's temperature is very high, generally over 2,000°C. At this high temperature of 2,000°C, about 5 percent of the electrical energy converts into visible light and rest of it is emitted as heat or infrared radiation.
[10] Which one of the following is not a Major Abiotic Factors?
A.
Temperature
B.
Water
C.
Light
D.
Air
Ans:
Air
Explanation :
Major abiotic factors include water, sunlight, oxygen, soil and temperature.
[11] Optical fibre works on the principle of –
A.
refraction
B.
scattering
C.
interference
D.
total internal reflection
Ans:
total internal reflection
Explanation :
Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.
[12] The colours of stars depend on their –
A.
temperature
B.
distance
C.
radius
D.
atmospheric pressure
Ans:
temperature
Explanation :
The colour of a star tells about its temperature, and the temperature depends on some combination of the star's mass and evolutionary phase.
[13] Water has maximum density at –
A.
100°C
B.
0°C
C.
4°C
D.
273°C
Ans:
4°C
Explanation :
The maximum density of water occurs at 4 °C because at this temperature, two opposing effects are in balance. Water is an exceptional compound that has a lower density in the solid phase than the liquid phase (i.e., ice floats on water). This is actually due to the ion nature of water in the liquid phase, which packs the molecules tightly together.
[14] Which of the following colour of light deviates least through the prism?
A.
yellow
B.
green
C.
violet
D.
red
Ans:
red
Explanation :
In refracting media like glass prism, water, etc., lights of different colors travel with different speeds. The speed of violet colour is the least, while the speed of red colour is the largest in prism. As a result, the refractive index of glass is largest for violet colour and least for red colour. So the violet colour is deviated the most, while red colour is deviated least on passing through the prism.
[15] Hydraulic brakes work on the principle of –
A.
Thomson's law
B.
Newton's law
C.
Bernoulli's theorem
D.
Pascal's law
Ans:
Pascal's law
Explanation :
Hydraulic brake works on Pascal's law which states that pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such that the pressure variations remain the same.
[16] X- rays are waves.
A.
Longitudinal
B.
Transverse
C.
Electromagnetic
D.
Elastic
Ans:
Electromagnetic
Explanation :
X-rays are a form of electromagnetic radiation as are radio waves.
[17] Which planet is nearest to the sun?
A.
Earth
B.
Jupiter
C.
Mercury
D.
Mars
Ans:
Jupiter
Explanation :
At an average distance of only 57.9 million km, Mercury orbits closer to the Sun than any other planet. Mercury takes only 88 days to complete an orbit around the Sun.
[18] The moon that we see in the sky is a .
A.
Planet
B.
Star
C.
Sun
D.
Satellite
Ans:
Satellite
Explanation :
The moon that we see in the sky is a satellite. It is a companion of our earth and moves round it. Like our earth, there are eight other planets that get heat and light from the sun.
[19] The absolute zero is a temperature at which _.
A.
molecular motion in a gas would cease
B.
water freezes
C.
all gases become liquid
D.
all gases become solid
Ans:
molecular motion in a gas would cease
Explanation :
Absolute zero is the lowest possible temperature where nothing could be colder and no heat energy remains in a substance. It is the point at which all motion in matter stops.
[20] The term "infrasonic" applied to sound refers to sound waves below -
A.
200 Hz
B.
20000 Hz
C.
20 Hz
D.
0 Hz
Ans:
20 Hz
Explanation :
The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound, and nominally includes anything under 20Hz.
[21] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states that?
A.
Newton’s first law
B.
Newton’s Second Law
C.
Newton’s Third Law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Conservation of linear momentum. The principle that the linear momentum of a system has constant magnitude and direction if the system is subjected to no external force. Also called law of conservation of linear momentum
[22] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[23] A body moving in a circular path with a constant speed has a –
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path.
[24] The Solar energy produced by –
A.
Fusion reaction
B.
Fission reaction
C.
Combustion reaction
D.
None
Ans:
Fusion reaction
Explanation :
The Sun is amain-sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, the Sun fuses 620 million metric tons of hydrogen each second. Fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new nucleus.
[25] In which form is the supplied heat energy stored during change in temperature of substance?
A.
Heat energy
B.
Kinetic energy
C.
Potential energy
D.
Both kinetic and potential energy
Ans:
Kinetic energy
Explanation :
Temperature is used as a measure for heat in an object by measuring the amount of kinetic energy in the molecules that make up the object. It is a measure of the average kinetic energy of the random molecular motion. Heat is a form of energy that can be transferred from the heat source to the molecules, and it can also change its form from heat to movement.
Explanation :
Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.
[12] The colours of stars depend on their –
A.
temperature
B.
distance
C.
radius
D.
atmospheric pressure
Ans:
temperature
Explanation :
The colour of a star tells about its temperature, and the temperature depends on some combination of the star's mass and evolutionary phase.
[13] Water has maximum density at –
A.
100°C
B.
0°C
C.
4°C
D.
273°C
Ans:
4°C
Explanation :
The maximum density of water occurs at 4 °C because at this temperature, two opposing effects are in balance. Water is an exceptional compound that has a lower density in the solid phase than the liquid phase (i.e., ice floats on water). This is actually due to the ion nature of water in the liquid phase, which packs the molecules tightly together.
[14] Which of the following colour of light deviates least through the prism?
A.
yellow
B.
green
C.
violet
D.
red
Ans:
red
Explanation :
In refracting media like glass prism, water, etc., lights of different colors travel with different speeds. The speed of violet colour is the least, while the speed of red colour is the largest in prism. As a result, the refractive index of glass is largest for violet colour and least for red colour. So the violet colour is deviated the most, while red colour is deviated least on passing through the prism.
[15] Hydraulic brakes work on the principle of –
A.
Thomson's law
B.
Newton's law
C.
Bernoulli's theorem
D.
Pascal's law
Ans:
Pascal's law
Explanation :
Hydraulic brake works on Pascal's law which states that pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such that the pressure variations remain the same.
[16] X- rays are waves.
A.
Longitudinal
B.
Transverse
C.
Electromagnetic
D.
Elastic
Ans:
Electromagnetic
Explanation :
X-rays are a form of electromagnetic radiation as are radio waves.
[17] Which planet is nearest to the sun?
A.
Earth
B.
Jupiter
C.
Mercury
D.
Mars
Ans:
Jupiter
Explanation :
At an average distance of only 57.9 million km, Mercury orbits closer to the Sun than any other planet. Mercury takes only 88 days to complete an orbit around the Sun.
[18] The moon that we see in the sky is a .
A.
Planet
B.
Star
C.
Sun
D.
Satellite
Ans:
Satellite
Explanation :
The moon that we see in the sky is a satellite. It is a companion of our earth and moves round it. Like our earth, there are eight other planets that get heat and light from the sun.
[19] The absolute zero is a temperature at which _.
A.
molecular motion in a gas would cease
B.
water freezes
C.
all gases become liquid
D.
all gases become solid
Ans:
molecular motion in a gas would cease
Explanation :
Absolute zero is the lowest possible temperature where nothing could be colder and no heat energy remains in a substance. It is the point at which all motion in matter stops.
[20] The term "infrasonic" applied to sound refers to sound waves below -
A.
200 Hz
B.
20000 Hz
C.
20 Hz
D.
0 Hz
Ans:
20 Hz
Explanation :
The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound, and nominally includes anything under 20Hz.
[21] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states that?
A.
Newton’s first law
B.
Newton’s Second Law
C.
Newton’s Third Law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Conservation of linear momentum. The principle that the linear momentum of a system has constant magnitude and direction if the system is subjected to no external force. Also called law of conservation of linear momentum
[22] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[23] A body moving in a circular path with a constant speed has a –
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path.
[24] The Solar energy produced by –
A.
Fusion reaction
B.
Fission reaction
C.
Combustion reaction
D.
None
Ans:
Fusion reaction
Explanation :
The Sun is amain-sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, the Sun fuses 620 million metric tons of hydrogen each second. Fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new nucleus.
[25] In which form is the supplied heat energy stored during change in temperature of substance?
A.
Heat energy
B.
Kinetic energy
C.
Potential energy
D.
Both kinetic and potential energy
Ans:
Kinetic energy
Explanation :
Temperature is used as a measure for heat in an object by measuring the amount of kinetic energy in the molecules that make up the object. It is a measure of the average kinetic energy of the random molecular motion. Heat is a form of energy that can be transferred from the heat source to the molecules, and it can also change its form from heat to movement.
Explanation :
The maximum density of water occurs at 4 °C because at this temperature, two opposing effects are in balance. Water is an exceptional compound that has a lower density in the solid phase than the liquid phase (i.e., ice floats on water). This is actually due to the ion nature of water in the liquid phase, which packs the molecules tightly together.
[14] Which of the following colour of light deviates least through the prism?
A.
yellow
B.
green
C.
violet
D.
red
Ans:
red
Explanation :
In refracting media like glass prism, water, etc., lights of different colors travel with different speeds. The speed of violet colour is the least, while the speed of red colour is the largest in prism. As a result, the refractive index of glass is largest for violet colour and least for red colour. So the violet colour is deviated the most, while red colour is deviated least on passing through the prism.
[15] Hydraulic brakes work on the principle of –
A.
Thomson's law
B.
Newton's law
C.
Bernoulli's theorem
D.
Pascal's law
Ans:
Pascal's law
Explanation :
Hydraulic brake works on Pascal's law which states that pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such that the pressure variations remain the same.
[16] X- rays are waves.
A.
Longitudinal
B.
Transverse
C.
Electromagnetic
D.
Elastic
Ans:
Electromagnetic
Explanation :
X-rays are a form of electromagnetic radiation as are radio waves.
[17] Which planet is nearest to the sun?
A.
Earth
B.
Jupiter
C.
Mercury
D.
Mars
Ans:
Jupiter
Explanation :
At an average distance of only 57.9 million km, Mercury orbits closer to the Sun than any other planet. Mercury takes only 88 days to complete an orbit around the Sun.
[18] The moon that we see in the sky is a .
A.
Planet
B.
Star
C.
Sun
D.
Satellite
Ans:
Satellite
Explanation :
The moon that we see in the sky is a satellite. It is a companion of our earth and moves round it. Like our earth, there are eight other planets that get heat and light from the sun.
[19] The absolute zero is a temperature at which _.
A.
molecular motion in a gas would cease
B.
water freezes
C.
all gases become liquid
D.
all gases become solid
Ans:
molecular motion in a gas would cease
Explanation :
Absolute zero is the lowest possible temperature where nothing could be colder and no heat energy remains in a substance. It is the point at which all motion in matter stops.
[20] The term "infrasonic" applied to sound refers to sound waves below -
A.
200 Hz
B.
20000 Hz
C.
20 Hz
D.
0 Hz
Ans:
20 Hz
Explanation :
The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound, and nominally includes anything under 20Hz.
[21] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states that?
A.
Newton’s first law
B.
Newton’s Second Law
C.
Newton’s Third Law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Conservation of linear momentum. The principle that the linear momentum of a system has constant magnitude and direction if the system is subjected to no external force. Also called law of conservation of linear momentum
[22] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[23] A body moving in a circular path with a constant speed has a –
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path.
[24] The Solar energy produced by –
A.
Fusion reaction
B.
Fission reaction
C.
Combustion reaction
D.
None
Ans:
Fusion reaction
Explanation :
The Sun is amain-sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, the Sun fuses 620 million metric tons of hydrogen each second. Fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new nucleus.
[25] In which form is the supplied heat energy stored during change in temperature of substance?
A.
Heat energy
B.
Kinetic energy
C.
Potential energy
D.
Both kinetic and potential energy
Ans:
Kinetic energy
Explanation :
Temperature is used as a measure for heat in an object by measuring the amount of kinetic energy in the molecules that make up the object. It is a measure of the average kinetic energy of the random molecular motion. Heat is a form of energy that can be transferred from the heat source to the molecules, and it can also change its form from heat to movement.
Explanation :
Hydraulic brake works on Pascal's law which states that pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such that the pressure variations remain the same.
[16] X- rays are waves.
A.
Longitudinal
B.
Transverse
C.
Electromagnetic
D.
Elastic
Ans:
Electromagnetic
Explanation :
X-rays are a form of electromagnetic radiation as are radio waves.
[17] Which planet is nearest to the sun?
A.
Earth
B.
Jupiter
C.
Mercury
D.
Mars
Ans:
Jupiter
Explanation :
At an average distance of only 57.9 million km, Mercury orbits closer to the Sun than any other planet. Mercury takes only 88 days to complete an orbit around the Sun.
[18] The moon that we see in the sky is a .
A.
Planet
B.
Star
C.
Sun
D.
Satellite
Ans:
Satellite
Explanation :
The moon that we see in the sky is a satellite. It is a companion of our earth and moves round it. Like our earth, there are eight other planets that get heat and light from the sun.
[19] The absolute zero is a temperature at which _.
A.
molecular motion in a gas would cease
B.
water freezes
C.
all gases become liquid
D.
all gases become solid
Ans:
molecular motion in a gas would cease
Explanation :
Absolute zero is the lowest possible temperature where nothing could be colder and no heat energy remains in a substance. It is the point at which all motion in matter stops.
[20] The term "infrasonic" applied to sound refers to sound waves below -
A.
200 Hz
B.
20000 Hz
C.
20 Hz
D.
0 Hz
Ans:
20 Hz
Explanation :
The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound, and nominally includes anything under 20Hz.
[21] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states that?
A.
Newton’s first law
B.
Newton’s Second Law
C.
Newton’s Third Law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Conservation of linear momentum. The principle that the linear momentum of a system has constant magnitude and direction if the system is subjected to no external force. Also called law of conservation of linear momentum
[22] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[23] A body moving in a circular path with a constant speed has a –
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path.
[24] The Solar energy produced by –
A.
Fusion reaction
B.
Fission reaction
C.
Combustion reaction
D.
None
Ans:
Fusion reaction
Explanation :
The Sun is amain-sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, the Sun fuses 620 million metric tons of hydrogen each second. Fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new nucleus.
[25] In which form is the supplied heat energy stored during change in temperature of substance?
A.
Heat energy
B.
Kinetic energy
C.
Potential energy
D.
Both kinetic and potential energy
Ans:
Kinetic energy
Explanation :
Temperature is used as a measure for heat in an object by measuring the amount of kinetic energy in the molecules that make up the object. It is a measure of the average kinetic energy of the random molecular motion. Heat is a form of energy that can be transferred from the heat source to the molecules, and it can also change its form from heat to movement.
Explanation :
At an average distance of only 57.9 million km, Mercury orbits closer to the Sun than any other planet. Mercury takes only 88 days to complete an orbit around the Sun.
[18] The moon that we see in the sky is a .
A.
Planet
B.
Star
C.
Sun
D.
Satellite
Ans:
Satellite
Explanation :
The moon that we see in the sky is a satellite. It is a companion of our earth and moves round it. Like our earth, there are eight other planets that get heat and light from the sun.
[19] The absolute zero is a temperature at which _.
A.
molecular motion in a gas would cease
B.
water freezes
C.
all gases become liquid
D.
all gases become solid
Ans:
molecular motion in a gas would cease
Explanation :
Absolute zero is the lowest possible temperature where nothing could be colder and no heat energy remains in a substance. It is the point at which all motion in matter stops.
[20] The term "infrasonic" applied to sound refers to sound waves below -
A.
200 Hz
B.
20000 Hz
C.
20 Hz
D.
0 Hz
Ans:
20 Hz
Explanation :
The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound, and nominally includes anything under 20Hz.
[21] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states that?
A.
Newton’s first law
B.
Newton’s Second Law
C.
Newton’s Third Law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Conservation of linear momentum. The principle that the linear momentum of a system has constant magnitude and direction if the system is subjected to no external force. Also called law of conservation of linear momentum
[22] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[23] A body moving in a circular path with a constant speed has a –
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path.
[24] The Solar energy produced by –
A.
Fusion reaction
B.
Fission reaction
C.
Combustion reaction
D.
None
Ans:
Fusion reaction
Explanation :
The Sun is amain-sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, the Sun fuses 620 million metric tons of hydrogen each second. Fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new nucleus.
[25] In which form is the supplied heat energy stored during change in temperature of substance?
A.
Heat energy
B.
Kinetic energy
C.
Potential energy
D.
Both kinetic and potential energy
Ans:
Kinetic energy
Explanation :
Temperature is used as a measure for heat in an object by measuring the amount of kinetic energy in the molecules that make up the object. It is a measure of the average kinetic energy of the random molecular motion. Heat is a form of energy that can be transferred from the heat source to the molecules, and it can also change its form from heat to movement.
Explanation :
Absolute zero is the lowest possible temperature where nothing could be colder and no heat energy remains in a substance. It is the point at which all motion in matter stops.
[20] The term "infrasonic" applied to sound refers to sound waves below -
A.
200 Hz
B.
20000 Hz
C.
20 Hz
D.
0 Hz
Ans:
20 Hz
Explanation :
The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound, and nominally includes anything under 20Hz.
[21] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states that?
A.
Newton’s first law
B.
Newton’s Second Law
C.
Newton’s Third Law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Conservation of linear momentum. The principle that the linear momentum of a system has constant magnitude and direction if the system is subjected to no external force. Also called law of conservation of linear momentum
[22] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[23] A body moving in a circular path with a constant speed has a –
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path.
[24] The Solar energy produced by –
A.
Fusion reaction
B.
Fission reaction
C.
Combustion reaction
D.
None
Ans:
Fusion reaction
Explanation :
The Sun is amain-sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, the Sun fuses 620 million metric tons of hydrogen each second. Fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new nucleus.
[25] In which form is the supplied heat energy stored during change in temperature of substance?
A.
Heat energy
B.
Kinetic energy
C.
Potential energy
D.
Both kinetic and potential energy
Ans:
Kinetic energy
Explanation :
Temperature is used as a measure for heat in an object by measuring the amount of kinetic energy in the molecules that make up the object. It is a measure of the average kinetic energy of the random molecular motion. Heat is a form of energy that can be transferred from the heat source to the molecules, and it can also change its form from heat to movement.
Explanation :
Conservation of linear momentum. The principle that the linear momentum of a system has constant magnitude and direction if the system is subjected to no external force. Also called law of conservation of linear momentum
[22] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[23] A body moving in a circular path with a constant speed has a –
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path.
[24] The Solar energy produced by –
A.
Fusion reaction
B.
Fission reaction
C.
Combustion reaction
D.
None
Ans:
Fusion reaction
Explanation :
The Sun is amain-sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, the Sun fuses 620 million metric tons of hydrogen each second. Fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new nucleus.
[25] In which form is the supplied heat energy stored during change in temperature of substance?
A.
Heat energy
B.
Kinetic energy
C.
Potential energy
D.
Both kinetic and potential energy
Ans:
Kinetic energy
Explanation :
Temperature is used as a measure for heat in an object by measuring the amount of kinetic energy in the molecules that make up the object. It is a measure of the average kinetic energy of the random molecular motion. Heat is a form of energy that can be transferred from the heat source to the molecules, and it can also change its form from heat to movement.
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path.
[24] The Solar energy produced by –
A.
Fusion reaction
B.
Fission reaction
C.
Combustion reaction
D.
None
Ans:
Fusion reaction
Explanation :
The Sun is amain-sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, the Sun fuses 620 million metric tons of hydrogen each second. Fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new nucleus.
[25] In which form is the supplied heat energy stored during change in temperature of substance?
A.
Heat energy
B.
Kinetic energy
C.
Potential energy
D.
Both kinetic and potential energy
Ans:
Kinetic energy
Explanation :
Temperature is used as a measure for heat in an object by measuring the amount of kinetic energy in the molecules that make up the object. It is a measure of the average kinetic energy of the random molecular motion. Heat is a form of energy that can be transferred from the heat source to the molecules, and it can also change its form from heat to movement.
Explanation :
Temperature is used as a measure for heat in an object by measuring the amount of kinetic energy in the molecules that make up the object. It is a measure of the average kinetic energy of the random molecular motion. Heat is a form of energy that can be transferred from the heat source to the molecules, and it can also change its form from heat to movement.