[1] Fuse wire is made of an alloy of –
A.
Tin and Lead
B.
Tin and Copper
C.
Lead and Copper
D.
Copper and Silver
Ans:
Tin and Lead
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide over current protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[2] The colour of the ocean appears to be blue because the sunlight falling on it is –
A.
reflected
B.
refracted
C.
diffracted
D.
scattered
Ans:
scattered
Explanation :
The reason the ocean is blue is due to the absorption and scattering of light. The blue wavelengths of light are scattered, similar to the scattering of blue light in the sky but absorption is a much larger factor than scattering for the clear ocean water. In water, absorption is strong in the red and weak in the blue, thus red light is absorbed quickly in the ocean leaving blue.
[3] During which of the following operating conditions of an auto-mobile, carbon monoxide content in exhaust gas is maximum?
A.
Acceleration
B.
Cruising
C.
Idle running
D.
Deacceleration
Ans:
Idle running
Explanation :
High Carbon Monoxide (CO) content in exhaust gas of automobiles usually indicates a fuel mixture richer than ideal (rich mixture - air fuel ratio below 14.7).
[4] The least distance of distinct vision is –
A.
35 cm
B.
25 cm
C.
45 cm
D.
15 cm
Ans:
25 cm
Explanation :
Least distance of distinct vision is the minimum object's distance that is able to produce a distinct image on the retina. This distance is about 25 cm from the eye. However, it varies with age. For infants the least distance of distinct vision is about 5 to 8 cm.
[5] Sound waves can be transmitted by any –
A.
Medium
B.
Vacuum
C.
Both medium and vacuum
D.
None of the above
Ans:
Medium
Explanation :
Sound is transmitted through gases, plasma, and liquids as longitudinal waves, also called compression waves. It requires a medium to propagate.
[6] Which term is not associated with sound wave?
A.
Hertz
B.
Decibel
C.
Candela
D.
Mach
Ans:
Candela
Explanation :
Candela is the standard unit of luminous intensity, the luminous power per unit solid angle emitted by a point light source in a particular direction, in the International System of Units. The word candela means candle in Latin.
[7] If an electron and a photon have the same wavelength, then they will have the same –
A.
velocity
B.
linear momentum
C.
angular momentum
D.
energy
Ans:
linear momentum
Explanation :
When a non-relativistic electron and a non-relativistic proton are moving and have the same de Broglie wavelength, then they will have the same linear mo-mentum p = mv.
[8] In hydel power station, the motion produced in turbines is due to –
A.
flow of water
B.
burning of coal
C.
burning of diesel
D.
production of steam
Ans:
flow of water
Explanation :
A water turbine is a rotary machine that converts kinetic energy and potential energy of water into mechanical work. Hydroelectric power comes from water at work, water in motion. To generate electricity, water must be in motion. This is kinetic (moving) energy.
[9] The point where total mass of a body is supposed to be concentrated is known as –
A.
Dead centre
B.
Centre of mass
C.
Centre of gravity
D.
Centre of motion
Ans:
Centre of mass
Explanation :
The centre of mass of a body or a system of particles is defined as a single point at which the whole mass of the body or system is imagined to be concentrated and all the applied forces acts at that point. It is that point that moves when forces are applied on the body.
[10] Curie is an unit of –
A.
Radioactivity
B.
energy of Gamma rays
C.
intensity of Gamma rays
D.
work function
Ans:
Radioactivity
Explanation :
The curie (symbol Ci) is a non-SI unit of radioactivity, named 'in honour of Pierre Curie. It was originally defined as "the quantity or mass of radium emanation in equilibrium with one gram of radium (element)".
[11] The mass of an electron in motion depends upon -
A.
Direction of motion
B.
B its velocity
C.
C its velocity of e-
D.
D it’s shell number
Ans:
B its velocity
Explanation :
The electron has a mass that is approximately 1/1836 that of the proton. Quantum mechanical properties of the electron include an intrinsic angular momentum (spin) of a half-integer value, expressed in units of the reduced Planck constant, ħ.
[12] Water drops cannot stick to the oily surface due to –
A.
lack of adhesive force
B.
surface tension
C.
cannot mix each other
D.
water is lighter than oil
Ans:
surface tension
Explanation :
The separation of oil and water is caused due to the difference in surface tension of the two liquids. The water molecules stick together tightly and does not mix with the oil because water molecules are attracted to each other very strongly, forming an invisible "skin" of surface tension around each drop.
[13] Decibel is the unit of .
A.
Speed of light
B.
Intensity of sound
C.
Intensity of heat
D.
None of these
Ans:
Intensity of sound
Explanation :
Decibel (dB) unit is used for expressing the ratio between two amounts of electric or acoustic power for measuring the relative loudness of sounds.
[14] Magnetic keepers are pieces of –
A.
Nickel
B.
Cobalt
C.
Steel
D.
Soft iron
Ans:
Soft iron
Explanation :
Magnetic keepers arc pieces of soft iron that are placed across the poles of a bar magnet or a horseshoe magnet. They help prevent the loss of magnetism.
[15] Certain substances loose their electrical resistance completely at super low temperature. Such, substances are called.
A.
Super conductors
B.
Semi conductors
C.
Dielectrics
D.
Perfect conductors
Ans:
Super conductors
Explanation :
Superconductors are materials that carry electrical current with little or no resistance when cooled below a certain temperature. While conventional superconductors need to be cooled close to absolute zero (-273.15 °C) before they superconduct, high temperature superconductors do so above the boiling point of liquid nitrogen (-196 °C).
[16] In a transistor, the base is _.
A.
an insulator
B.
a conductor of low resistance
C.
a conductor of high resistance
D.
an extrinsic semiconductor
Ans:
a conductor of low resistance
Explanation :
A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit.
[17] Sound waves are produced by -
A.
Linear motion
B.
Circular motion
C.
Vibrating bodies
D.
Transitional motion
Ans:
Vibrating bodies
Explanation :
Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate.
[18] The weight of a body acts through the centre of –
A.
gravity
B.
mass
C.
both (1) and (2)
D.
buoyancy
Ans:
gravity
Explanation :
The centre of gravity of a collection of masses is the point where all the weight of the object can be considered to be concentrated. The entire weight acts through the center of gravity instead of acting through the individual masses. In a uniform gravitational field (like the field close to the surface of the Earth) the Centres of Gravity and Mass are in exactly the same place.
[19] A wheel-barrow is an example of –
A.
class III lever
B.
pulley system
C.
class I lever
D.
class II lever
Ans:
class II lever
Explanation :
In a Type 2 Lever, the load is between the pivot (fulcrum) and the effort. Examples of common tools that use a type 2 lever include: stapler, bottle opener, wheel barrow, nail clippers and nut cracker.
[20] The work done by the string of a simple pendulum during one complete oscillation is equal to –
A.
Total energy of the pendulum
B.
Kinetic energy of the pendulum
C.
Potential energy of the pendulum
D.
Zero
Ans:
Zero
Explanation :
Work done by the string of the simple pendulum during one complete oscillation is zero. Tension in the string exactly cancels the component parallel to the string. This leaves a net restoring force back to- ward the equilibrium position as equal to zero.
[21] The minimum number of forces to keep a particle in equilibrium is –
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
When the resultant of all forces acting on a particle is zero, the particle is in equilibrium. The equilibrium of a particle to which a single force is applied may be maintained by the application of a second force that is equal in magnitude and direction, but opposite in sense, to the first force.
[22] Which instrument is used to record the speed of a vehicle?
A.
Thermometer
B.
Barometer
C.
Speedometer
D.
Oscilloscope
Ans:
Speedometer
Explanation :
Speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled.
[23] Human ear responds to intensities in range -
A.
10-12Wm-2 to 1Wm-2
B.
15Wm-2 to 18Wm-2
C.
108Wm-2 to 2Wm-2
D.
10-3Wm-1 to 10-6Wm-1
Ans:
10-12Wm-2 to 1Wm-2
Explanation :
The human ear has an incredibly large range, being able to detect sound intensities from 1 x 10-12 W/m2 to 1 W/m2.
[24] Speed of sound in air depends on the -
A.
Chemical conditions
B.
Physical conditions
C.
Pitch
D.
None of these
Ans:
Physical conditions
Explanation :
Wind can increase or decrease the speed, and can even push sound waves sideways. Air density affects it. Temperature, pressure, humidity and gas mixture can each affect the density.
[25] The redness in atmosphere at Sunrise and Sunset is due to –
A.
Refraction of light
B.
Reflection of light
C.
Dispersion of light
D.
Scattering of light
Ans:
Scattering of light
Explanation :
The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. At sunrise or sunset, since the Sun is low on the horizon, the light rays must pass through more of the atmosphere #NAME?
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide over current protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[2] The colour of the ocean appears to be blue because the sunlight falling on it is –
A.
reflected
B.
refracted
C.
diffracted
D.
scattered
Ans:
scattered
Explanation :
The reason the ocean is blue is due to the absorption and scattering of light. The blue wavelengths of light are scattered, similar to the scattering of blue light in the sky but absorption is a much larger factor than scattering for the clear ocean water. In water, absorption is strong in the red and weak in the blue, thus red light is absorbed quickly in the ocean leaving blue.
[3] During which of the following operating conditions of an auto-mobile, carbon monoxide content in exhaust gas is maximum?
A.
Acceleration
B.
Cruising
C.
Idle running
D.
Deacceleration
Ans:
Idle running
Explanation :
High Carbon Monoxide (CO) content in exhaust gas of automobiles usually indicates a fuel mixture richer than ideal (rich mixture - air fuel ratio below 14.7).
[4] The least distance of distinct vision is –
A.
35 cm
B.
25 cm
C.
45 cm
D.
15 cm
Ans:
25 cm
Explanation :
Least distance of distinct vision is the minimum object's distance that is able to produce a distinct image on the retina. This distance is about 25 cm from the eye. However, it varies with age. For infants the least distance of distinct vision is about 5 to 8 cm.
[5] Sound waves can be transmitted by any –
A.
Medium
B.
Vacuum
C.
Both medium and vacuum
D.
None of the above
Ans:
Medium
Explanation :
Sound is transmitted through gases, plasma, and liquids as longitudinal waves, also called compression waves. It requires a medium to propagate.
[6] Which term is not associated with sound wave?
A.
Hertz
B.
Decibel
C.
Candela
D.
Mach
Ans:
Candela
Explanation :
Candela is the standard unit of luminous intensity, the luminous power per unit solid angle emitted by a point light source in a particular direction, in the International System of Units. The word candela means candle in Latin.
[7] If an electron and a photon have the same wavelength, then they will have the same –
A.
velocity
B.
linear momentum
C.
angular momentum
D.
energy
Ans:
linear momentum
Explanation :
When a non-relativistic electron and a non-relativistic proton are moving and have the same de Broglie wavelength, then they will have the same linear mo-mentum p = mv.
[8] In hydel power station, the motion produced in turbines is due to –
A.
flow of water
B.
burning of coal
C.
burning of diesel
D.
production of steam
Ans:
flow of water
Explanation :
A water turbine is a rotary machine that converts kinetic energy and potential energy of water into mechanical work. Hydroelectric power comes from water at work, water in motion. To generate electricity, water must be in motion. This is kinetic (moving) energy.
[9] The point where total mass of a body is supposed to be concentrated is known as –
A.
Dead centre
B.
Centre of mass
C.
Centre of gravity
D.
Centre of motion
Ans:
Centre of mass
Explanation :
The centre of mass of a body or a system of particles is defined as a single point at which the whole mass of the body or system is imagined to be concentrated and all the applied forces acts at that point. It is that point that moves when forces are applied on the body.
[10] Curie is an unit of –
A.
Radioactivity
B.
energy of Gamma rays
C.
intensity of Gamma rays
D.
work function
Ans:
Radioactivity
Explanation :
The curie (symbol Ci) is a non-SI unit of radioactivity, named 'in honour of Pierre Curie. It was originally defined as "the quantity or mass of radium emanation in equilibrium with one gram of radium (element)".
[11] The mass of an electron in motion depends upon -
A.
Direction of motion
B.
B its velocity
C.
C its velocity of e-
D.
D it’s shell number
Ans:
B its velocity
Explanation :
The electron has a mass that is approximately 1/1836 that of the proton. Quantum mechanical properties of the electron include an intrinsic angular momentum (spin) of a half-integer value, expressed in units of the reduced Planck constant, ħ.
[12] Water drops cannot stick to the oily surface due to –
A.
lack of adhesive force
B.
surface tension
C.
cannot mix each other
D.
water is lighter than oil
Ans:
surface tension
Explanation :
The separation of oil and water is caused due to the difference in surface tension of the two liquids. The water molecules stick together tightly and does not mix with the oil because water molecules are attracted to each other very strongly, forming an invisible "skin" of surface tension around each drop.
[13] Decibel is the unit of .
A.
Speed of light
B.
Intensity of sound
C.
Intensity of heat
D.
None of these
Ans:
Intensity of sound
Explanation :
Decibel (dB) unit is used for expressing the ratio between two amounts of electric or acoustic power for measuring the relative loudness of sounds.
[14] Magnetic keepers are pieces of –
A.
Nickel
B.
Cobalt
C.
Steel
D.
Soft iron
Ans:
Soft iron
Explanation :
Magnetic keepers arc pieces of soft iron that are placed across the poles of a bar magnet or a horseshoe magnet. They help prevent the loss of magnetism.
[15] Certain substances loose their electrical resistance completely at super low temperature. Such, substances are called.
A.
Super conductors
B.
Semi conductors
C.
Dielectrics
D.
Perfect conductors
Ans:
Super conductors
Explanation :
Superconductors are materials that carry electrical current with little or no resistance when cooled below a certain temperature. While conventional superconductors need to be cooled close to absolute zero (-273.15 °C) before they superconduct, high temperature superconductors do so above the boiling point of liquid nitrogen (-196 °C).
[16] In a transistor, the base is _.
A.
an insulator
B.
a conductor of low resistance
C.
a conductor of high resistance
D.
an extrinsic semiconductor
Ans:
a conductor of low resistance
Explanation :
A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit.
[17] Sound waves are produced by -
A.
Linear motion
B.
Circular motion
C.
Vibrating bodies
D.
Transitional motion
Ans:
Vibrating bodies
Explanation :
Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate.
[18] The weight of a body acts through the centre of –
A.
gravity
B.
mass
C.
both (1) and (2)
D.
buoyancy
Ans:
gravity
Explanation :
The centre of gravity of a collection of masses is the point where all the weight of the object can be considered to be concentrated. The entire weight acts through the center of gravity instead of acting through the individual masses. In a uniform gravitational field (like the field close to the surface of the Earth) the Centres of Gravity and Mass are in exactly the same place.
[19] A wheel-barrow is an example of –
A.
class III lever
B.
pulley system
C.
class I lever
D.
class II lever
Ans:
class II lever
Explanation :
In a Type 2 Lever, the load is between the pivot (fulcrum) and the effort. Examples of common tools that use a type 2 lever include: stapler, bottle opener, wheel barrow, nail clippers and nut cracker.
[20] The work done by the string of a simple pendulum during one complete oscillation is equal to –
A.
Total energy of the pendulum
B.
Kinetic energy of the pendulum
C.
Potential energy of the pendulum
D.
Zero
Ans:
Zero
Explanation :
Work done by the string of the simple pendulum during one complete oscillation is zero. Tension in the string exactly cancels the component parallel to the string. This leaves a net restoring force back to- ward the equilibrium position as equal to zero.
[21] The minimum number of forces to keep a particle in equilibrium is –
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
When the resultant of all forces acting on a particle is zero, the particle is in equilibrium. The equilibrium of a particle to which a single force is applied may be maintained by the application of a second force that is equal in magnitude and direction, but opposite in sense, to the first force.
[22] Which instrument is used to record the speed of a vehicle?
A.
Thermometer
B.
Barometer
C.
Speedometer
D.
Oscilloscope
Ans:
Speedometer
Explanation :
Speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled.
[23] Human ear responds to intensities in range -
A.
10-12Wm-2 to 1Wm-2
B.
15Wm-2 to 18Wm-2
C.
108Wm-2 to 2Wm-2
D.
10-3Wm-1 to 10-6Wm-1
Ans:
10-12Wm-2 to 1Wm-2
Explanation :
The human ear has an incredibly large range, being able to detect sound intensities from 1 x 10-12 W/m2 to 1 W/m2.
[24] Speed of sound in air depends on the -
A.
Chemical conditions
B.
Physical conditions
C.
Pitch
D.
None of these
Ans:
Physical conditions
Explanation :
Wind can increase or decrease the speed, and can even push sound waves sideways. Air density affects it. Temperature, pressure, humidity and gas mixture can each affect the density.
[25] The redness in atmosphere at Sunrise and Sunset is due to –
A.
Refraction of light
B.
Reflection of light
C.
Dispersion of light
D.
Scattering of light
Ans:
Scattering of light
Explanation :
The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. At sunrise or sunset, since the Sun is low on the horizon, the light rays must pass through more of the atmosphere #NAME?
Explanation :
High Carbon Monoxide (CO) content in exhaust gas of automobiles usually indicates a fuel mixture richer than ideal (rich mixture - air fuel ratio below 14.7).
[4] The least distance of distinct vision is –
A.
35 cm
B.
25 cm
C.
45 cm
D.
15 cm
Ans:
25 cm
Explanation :
Least distance of distinct vision is the minimum object's distance that is able to produce a distinct image on the retina. This distance is about 25 cm from the eye. However, it varies with age. For infants the least distance of distinct vision is about 5 to 8 cm.
[5] Sound waves can be transmitted by any –
A.
Medium
B.
Vacuum
C.
Both medium and vacuum
D.
None of the above
Ans:
Medium
Explanation :
Sound is transmitted through gases, plasma, and liquids as longitudinal waves, also called compression waves. It requires a medium to propagate.
[6] Which term is not associated with sound wave?
A.
Hertz
B.
Decibel
C.
Candela
D.
Mach
Ans:
Candela
Explanation :
Candela is the standard unit of luminous intensity, the luminous power per unit solid angle emitted by a point light source in a particular direction, in the International System of Units. The word candela means candle in Latin.
[7] If an electron and a photon have the same wavelength, then they will have the same –
A.
velocity
B.
linear momentum
C.
angular momentum
D.
energy
Ans:
linear momentum
Explanation :
When a non-relativistic electron and a non-relativistic proton are moving and have the same de Broglie wavelength, then they will have the same linear mo-mentum p = mv.
[8] In hydel power station, the motion produced in turbines is due to –
A.
flow of water
B.
burning of coal
C.
burning of diesel
D.
production of steam
Ans:
flow of water
Explanation :
A water turbine is a rotary machine that converts kinetic energy and potential energy of water into mechanical work. Hydroelectric power comes from water at work, water in motion. To generate electricity, water must be in motion. This is kinetic (moving) energy.
[9] The point where total mass of a body is supposed to be concentrated is known as –
A.
Dead centre
B.
Centre of mass
C.
Centre of gravity
D.
Centre of motion
Ans:
Centre of mass
Explanation :
The centre of mass of a body or a system of particles is defined as a single point at which the whole mass of the body or system is imagined to be concentrated and all the applied forces acts at that point. It is that point that moves when forces are applied on the body.
[10] Curie is an unit of –
A.
Radioactivity
B.
energy of Gamma rays
C.
intensity of Gamma rays
D.
work function
Ans:
Radioactivity
Explanation :
The curie (symbol Ci) is a non-SI unit of radioactivity, named 'in honour of Pierre Curie. It was originally defined as "the quantity or mass of radium emanation in equilibrium with one gram of radium (element)".
[11] The mass of an electron in motion depends upon -
A.
Direction of motion
B.
B its velocity
C.
C its velocity of e-
D.
D it’s shell number
Ans:
B its velocity
Explanation :
The electron has a mass that is approximately 1/1836 that of the proton. Quantum mechanical properties of the electron include an intrinsic angular momentum (spin) of a half-integer value, expressed in units of the reduced Planck constant, ħ.
[12] Water drops cannot stick to the oily surface due to –
A.
lack of adhesive force
B.
surface tension
C.
cannot mix each other
D.
water is lighter than oil
Ans:
surface tension
Explanation :
The separation of oil and water is caused due to the difference in surface tension of the two liquids. The water molecules stick together tightly and does not mix with the oil because water molecules are attracted to each other very strongly, forming an invisible "skin" of surface tension around each drop.
[13] Decibel is the unit of .
A.
Speed of light
B.
Intensity of sound
C.
Intensity of heat
D.
None of these
Ans:
Intensity of sound
Explanation :
Decibel (dB) unit is used for expressing the ratio between two amounts of electric or acoustic power for measuring the relative loudness of sounds.
[14] Magnetic keepers are pieces of –
A.
Nickel
B.
Cobalt
C.
Steel
D.
Soft iron
Ans:
Soft iron
Explanation :
Magnetic keepers arc pieces of soft iron that are placed across the poles of a bar magnet or a horseshoe magnet. They help prevent the loss of magnetism.
[15] Certain substances loose their electrical resistance completely at super low temperature. Such, substances are called.
A.
Super conductors
B.
Semi conductors
C.
Dielectrics
D.
Perfect conductors
Ans:
Super conductors
Explanation :
Superconductors are materials that carry electrical current with little or no resistance when cooled below a certain temperature. While conventional superconductors need to be cooled close to absolute zero (-273.15 °C) before they superconduct, high temperature superconductors do so above the boiling point of liquid nitrogen (-196 °C).
[16] In a transistor, the base is _.
A.
an insulator
B.
a conductor of low resistance
C.
a conductor of high resistance
D.
an extrinsic semiconductor
Ans:
a conductor of low resistance
Explanation :
A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit.
[17] Sound waves are produced by -
A.
Linear motion
B.
Circular motion
C.
Vibrating bodies
D.
Transitional motion
Ans:
Vibrating bodies
Explanation :
Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate.
[18] The weight of a body acts through the centre of –
A.
gravity
B.
mass
C.
both (1) and (2)
D.
buoyancy
Ans:
gravity
Explanation :
The centre of gravity of a collection of masses is the point where all the weight of the object can be considered to be concentrated. The entire weight acts through the center of gravity instead of acting through the individual masses. In a uniform gravitational field (like the field close to the surface of the Earth) the Centres of Gravity and Mass are in exactly the same place.
[19] A wheel-barrow is an example of –
A.
class III lever
B.
pulley system
C.
class I lever
D.
class II lever
Ans:
class II lever
Explanation :
In a Type 2 Lever, the load is between the pivot (fulcrum) and the effort. Examples of common tools that use a type 2 lever include: stapler, bottle opener, wheel barrow, nail clippers and nut cracker.
[20] The work done by the string of a simple pendulum during one complete oscillation is equal to –
A.
Total energy of the pendulum
B.
Kinetic energy of the pendulum
C.
Potential energy of the pendulum
D.
Zero
Ans:
Zero
Explanation :
Work done by the string of the simple pendulum during one complete oscillation is zero. Tension in the string exactly cancels the component parallel to the string. This leaves a net restoring force back to- ward the equilibrium position as equal to zero.
[21] The minimum number of forces to keep a particle in equilibrium is –
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
When the resultant of all forces acting on a particle is zero, the particle is in equilibrium. The equilibrium of a particle to which a single force is applied may be maintained by the application of a second force that is equal in magnitude and direction, but opposite in sense, to the first force.
[22] Which instrument is used to record the speed of a vehicle?
A.
Thermometer
B.
Barometer
C.
Speedometer
D.
Oscilloscope
Ans:
Speedometer
Explanation :
Speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled.
[23] Human ear responds to intensities in range -
A.
10-12Wm-2 to 1Wm-2
B.
15Wm-2 to 18Wm-2
C.
108Wm-2 to 2Wm-2
D.
10-3Wm-1 to 10-6Wm-1
Ans:
10-12Wm-2 to 1Wm-2
Explanation :
The human ear has an incredibly large range, being able to detect sound intensities from 1 x 10-12 W/m2 to 1 W/m2.
[24] Speed of sound in air depends on the -
A.
Chemical conditions
B.
Physical conditions
C.
Pitch
D.
None of these
Ans:
Physical conditions
Explanation :
Wind can increase or decrease the speed, and can even push sound waves sideways. Air density affects it. Temperature, pressure, humidity and gas mixture can each affect the density.
[25] The redness in atmosphere at Sunrise and Sunset is due to –
A.
Refraction of light
B.
Reflection of light
C.
Dispersion of light
D.
Scattering of light
Ans:
Scattering of light
Explanation :
The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. At sunrise or sunset, since the Sun is low on the horizon, the light rays must pass through more of the atmosphere #NAME?
Explanation :
Sound is transmitted through gases, plasma, and liquids as longitudinal waves, also called compression waves. It requires a medium to propagate.
[6] Which term is not associated with sound wave?
A.
Hertz
B.
Decibel
C.
Candela
D.
Mach
Ans:
Candela
Explanation :
Candela is the standard unit of luminous intensity, the luminous power per unit solid angle emitted by a point light source in a particular direction, in the International System of Units. The word candela means candle in Latin.
[7] If an electron and a photon have the same wavelength, then they will have the same –
A.
velocity
B.
linear momentum
C.
angular momentum
D.
energy
Ans:
linear momentum
Explanation :
When a non-relativistic electron and a non-relativistic proton are moving and have the same de Broglie wavelength, then they will have the same linear mo-mentum p = mv.
[8] In hydel power station, the motion produced in turbines is due to –
A.
flow of water
B.
burning of coal
C.
burning of diesel
D.
production of steam
Ans:
flow of water
Explanation :
A water turbine is a rotary machine that converts kinetic energy and potential energy of water into mechanical work. Hydroelectric power comes from water at work, water in motion. To generate electricity, water must be in motion. This is kinetic (moving) energy.
[9] The point where total mass of a body is supposed to be concentrated is known as –
A.
Dead centre
B.
Centre of mass
C.
Centre of gravity
D.
Centre of motion
Ans:
Centre of mass
Explanation :
The centre of mass of a body or a system of particles is defined as a single point at which the whole mass of the body or system is imagined to be concentrated and all the applied forces acts at that point. It is that point that moves when forces are applied on the body.
[10] Curie is an unit of –
A.
Radioactivity
B.
energy of Gamma rays
C.
intensity of Gamma rays
D.
work function
Ans:
Radioactivity
Explanation :
The curie (symbol Ci) is a non-SI unit of radioactivity, named 'in honour of Pierre Curie. It was originally defined as "the quantity or mass of radium emanation in equilibrium with one gram of radium (element)".
[11] The mass of an electron in motion depends upon -
A.
Direction of motion
B.
B its velocity
C.
C its velocity of e-
D.
D it’s shell number
Ans:
B its velocity
Explanation :
The electron has a mass that is approximately 1/1836 that of the proton. Quantum mechanical properties of the electron include an intrinsic angular momentum (spin) of a half-integer value, expressed in units of the reduced Planck constant, ħ.
[12] Water drops cannot stick to the oily surface due to –
A.
lack of adhesive force
B.
surface tension
C.
cannot mix each other
D.
water is lighter than oil
Ans:
surface tension
Explanation :
The separation of oil and water is caused due to the difference in surface tension of the two liquids. The water molecules stick together tightly and does not mix with the oil because water molecules are attracted to each other very strongly, forming an invisible "skin" of surface tension around each drop.
[13] Decibel is the unit of .
A.
Speed of light
B.
Intensity of sound
C.
Intensity of heat
D.
None of these
Ans:
Intensity of sound
Explanation :
Decibel (dB) unit is used for expressing the ratio between two amounts of electric or acoustic power for measuring the relative loudness of sounds.
[14] Magnetic keepers are pieces of –
A.
Nickel
B.
Cobalt
C.
Steel
D.
Soft iron
Ans:
Soft iron
Explanation :
Magnetic keepers arc pieces of soft iron that are placed across the poles of a bar magnet or a horseshoe magnet. They help prevent the loss of magnetism.
[15] Certain substances loose their electrical resistance completely at super low temperature. Such, substances are called.
A.
Super conductors
B.
Semi conductors
C.
Dielectrics
D.
Perfect conductors
Ans:
Super conductors
Explanation :
Superconductors are materials that carry electrical current with little or no resistance when cooled below a certain temperature. While conventional superconductors need to be cooled close to absolute zero (-273.15 °C) before they superconduct, high temperature superconductors do so above the boiling point of liquid nitrogen (-196 °C).
[16] In a transistor, the base is _.
A.
an insulator
B.
a conductor of low resistance
C.
a conductor of high resistance
D.
an extrinsic semiconductor
Ans:
a conductor of low resistance
Explanation :
A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit.
[17] Sound waves are produced by -
A.
Linear motion
B.
Circular motion
C.
Vibrating bodies
D.
Transitional motion
Ans:
Vibrating bodies
Explanation :
Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate.
[18] The weight of a body acts through the centre of –
A.
gravity
B.
mass
C.
both (1) and (2)
D.
buoyancy
Ans:
gravity
Explanation :
The centre of gravity of a collection of masses is the point where all the weight of the object can be considered to be concentrated. The entire weight acts through the center of gravity instead of acting through the individual masses. In a uniform gravitational field (like the field close to the surface of the Earth) the Centres of Gravity and Mass are in exactly the same place.
[19] A wheel-barrow is an example of –
A.
class III lever
B.
pulley system
C.
class I lever
D.
class II lever
Ans:
class II lever
Explanation :
In a Type 2 Lever, the load is between the pivot (fulcrum) and the effort. Examples of common tools that use a type 2 lever include: stapler, bottle opener, wheel barrow, nail clippers and nut cracker.
[20] The work done by the string of a simple pendulum during one complete oscillation is equal to –
A.
Total energy of the pendulum
B.
Kinetic energy of the pendulum
C.
Potential energy of the pendulum
D.
Zero
Ans:
Zero
Explanation :
Work done by the string of the simple pendulum during one complete oscillation is zero. Tension in the string exactly cancels the component parallel to the string. This leaves a net restoring force back to- ward the equilibrium position as equal to zero.
[21] The minimum number of forces to keep a particle in equilibrium is –
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
When the resultant of all forces acting on a particle is zero, the particle is in equilibrium. The equilibrium of a particle to which a single force is applied may be maintained by the application of a second force that is equal in magnitude and direction, but opposite in sense, to the first force.
[22] Which instrument is used to record the speed of a vehicle?
A.
Thermometer
B.
Barometer
C.
Speedometer
D.
Oscilloscope
Ans:
Speedometer
Explanation :
Speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled.
[23] Human ear responds to intensities in range -
A.
10-12Wm-2 to 1Wm-2
B.
15Wm-2 to 18Wm-2
C.
108Wm-2 to 2Wm-2
D.
10-3Wm-1 to 10-6Wm-1
Ans:
10-12Wm-2 to 1Wm-2
Explanation :
The human ear has an incredibly large range, being able to detect sound intensities from 1 x 10-12 W/m2 to 1 W/m2.
[24] Speed of sound in air depends on the -
A.
Chemical conditions
B.
Physical conditions
C.
Pitch
D.
None of these
Ans:
Physical conditions
Explanation :
Wind can increase or decrease the speed, and can even push sound waves sideways. Air density affects it. Temperature, pressure, humidity and gas mixture can each affect the density.
[25] The redness in atmosphere at Sunrise and Sunset is due to –
A.
Refraction of light
B.
Reflection of light
C.
Dispersion of light
D.
Scattering of light
Ans:
Scattering of light
Explanation :
The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. At sunrise or sunset, since the Sun is low on the horizon, the light rays must pass through more of the atmosphere #NAME?
Explanation :
When a non-relativistic electron and a non-relativistic proton are moving and have the same de Broglie wavelength, then they will have the same linear mo-mentum p = mv.
[8] In hydel power station, the motion produced in turbines is due to –
A.
flow of water
B.
burning of coal
C.
burning of diesel
D.
production of steam
Ans:
flow of water
Explanation :
A water turbine is a rotary machine that converts kinetic energy and potential energy of water into mechanical work. Hydroelectric power comes from water at work, water in motion. To generate electricity, water must be in motion. This is kinetic (moving) energy.
[9] The point where total mass of a body is supposed to be concentrated is known as –
A.
Dead centre
B.
Centre of mass
C.
Centre of gravity
D.
Centre of motion
Ans:
Centre of mass
Explanation :
The centre of mass of a body or a system of particles is defined as a single point at which the whole mass of the body or system is imagined to be concentrated and all the applied forces acts at that point. It is that point that moves when forces are applied on the body.
[10] Curie is an unit of –
A.
Radioactivity
B.
energy of Gamma rays
C.
intensity of Gamma rays
D.
work function
Ans:
Radioactivity
Explanation :
The curie (symbol Ci) is a non-SI unit of radioactivity, named 'in honour of Pierre Curie. It was originally defined as "the quantity or mass of radium emanation in equilibrium with one gram of radium (element)".
[11] The mass of an electron in motion depends upon -
A.
Direction of motion
B.
B its velocity
C.
C its velocity of e-
D.
D it’s shell number
Ans:
B its velocity
Explanation :
The electron has a mass that is approximately 1/1836 that of the proton. Quantum mechanical properties of the electron include an intrinsic angular momentum (spin) of a half-integer value, expressed in units of the reduced Planck constant, ħ.
[12] Water drops cannot stick to the oily surface due to –
A.
lack of adhesive force
B.
surface tension
C.
cannot mix each other
D.
water is lighter than oil
Ans:
surface tension
Explanation :
The separation of oil and water is caused due to the difference in surface tension of the two liquids. The water molecules stick together tightly and does not mix with the oil because water molecules are attracted to each other very strongly, forming an invisible "skin" of surface tension around each drop.
[13] Decibel is the unit of .
A.
Speed of light
B.
Intensity of sound
C.
Intensity of heat
D.
None of these
Ans:
Intensity of sound
Explanation :
Decibel (dB) unit is used for expressing the ratio between two amounts of electric or acoustic power for measuring the relative loudness of sounds.
[14] Magnetic keepers are pieces of –
A.
Nickel
B.
Cobalt
C.
Steel
D.
Soft iron
Ans:
Soft iron
Explanation :
Magnetic keepers arc pieces of soft iron that are placed across the poles of a bar magnet or a horseshoe magnet. They help prevent the loss of magnetism.
[15] Certain substances loose their electrical resistance completely at super low temperature. Such, substances are called.
A.
Super conductors
B.
Semi conductors
C.
Dielectrics
D.
Perfect conductors
Ans:
Super conductors
Explanation :
Superconductors are materials that carry electrical current with little or no resistance when cooled below a certain temperature. While conventional superconductors need to be cooled close to absolute zero (-273.15 °C) before they superconduct, high temperature superconductors do so above the boiling point of liquid nitrogen (-196 °C).
[16] In a transistor, the base is _.
A.
an insulator
B.
a conductor of low resistance
C.
a conductor of high resistance
D.
an extrinsic semiconductor
Ans:
a conductor of low resistance
Explanation :
A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit.
[17] Sound waves are produced by -
A.
Linear motion
B.
Circular motion
C.
Vibrating bodies
D.
Transitional motion
Ans:
Vibrating bodies
Explanation :
Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate.
[18] The weight of a body acts through the centre of –
A.
gravity
B.
mass
C.
both (1) and (2)
D.
buoyancy
Ans:
gravity
Explanation :
The centre of gravity of a collection of masses is the point where all the weight of the object can be considered to be concentrated. The entire weight acts through the center of gravity instead of acting through the individual masses. In a uniform gravitational field (like the field close to the surface of the Earth) the Centres of Gravity and Mass are in exactly the same place.
[19] A wheel-barrow is an example of –
A.
class III lever
B.
pulley system
C.
class I lever
D.
class II lever
Ans:
class II lever
Explanation :
In a Type 2 Lever, the load is between the pivot (fulcrum) and the effort. Examples of common tools that use a type 2 lever include: stapler, bottle opener, wheel barrow, nail clippers and nut cracker.
[20] The work done by the string of a simple pendulum during one complete oscillation is equal to –
A.
Total energy of the pendulum
B.
Kinetic energy of the pendulum
C.
Potential energy of the pendulum
D.
Zero
Ans:
Zero
Explanation :
Work done by the string of the simple pendulum during one complete oscillation is zero. Tension in the string exactly cancels the component parallel to the string. This leaves a net restoring force back to- ward the equilibrium position as equal to zero.
[21] The minimum number of forces to keep a particle in equilibrium is –
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
When the resultant of all forces acting on a particle is zero, the particle is in equilibrium. The equilibrium of a particle to which a single force is applied may be maintained by the application of a second force that is equal in magnitude and direction, but opposite in sense, to the first force.
[22] Which instrument is used to record the speed of a vehicle?
A.
Thermometer
B.
Barometer
C.
Speedometer
D.
Oscilloscope
Ans:
Speedometer
Explanation :
Speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled.
[23] Human ear responds to intensities in range -
A.
10-12Wm-2 to 1Wm-2
B.
15Wm-2 to 18Wm-2
C.
108Wm-2 to 2Wm-2
D.
10-3Wm-1 to 10-6Wm-1
Ans:
10-12Wm-2 to 1Wm-2
Explanation :
The human ear has an incredibly large range, being able to detect sound intensities from 1 x 10-12 W/m2 to 1 W/m2.
[24] Speed of sound in air depends on the -
A.
Chemical conditions
B.
Physical conditions
C.
Pitch
D.
None of these
Ans:
Physical conditions
Explanation :
Wind can increase or decrease the speed, and can even push sound waves sideways. Air density affects it. Temperature, pressure, humidity and gas mixture can each affect the density.
[25] The redness in atmosphere at Sunrise and Sunset is due to –
A.
Refraction of light
B.
Reflection of light
C.
Dispersion of light
D.
Scattering of light
Ans:
Scattering of light
Explanation :
The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. At sunrise or sunset, since the Sun is low on the horizon, the light rays must pass through more of the atmosphere #NAME?
Explanation :
The centre of mass of a body or a system of particles is defined as a single point at which the whole mass of the body or system is imagined to be concentrated and all the applied forces acts at that point. It is that point that moves when forces are applied on the body.
[10] Curie is an unit of –
A.
Radioactivity
B.
energy of Gamma rays
C.
intensity of Gamma rays
D.
work function
Ans:
Radioactivity
Explanation :
The curie (symbol Ci) is a non-SI unit of radioactivity, named 'in honour of Pierre Curie. It was originally defined as "the quantity or mass of radium emanation in equilibrium with one gram of radium (element)".
[11] The mass of an electron in motion depends upon -
A.
Direction of motion
B.
B its velocity
C.
C its velocity of e-
D.
D it’s shell number
Ans:
B its velocity
Explanation :
The electron has a mass that is approximately 1/1836 that of the proton. Quantum mechanical properties of the electron include an intrinsic angular momentum (spin) of a half-integer value, expressed in units of the reduced Planck constant, ħ.
[12] Water drops cannot stick to the oily surface due to –
A.
lack of adhesive force
B.
surface tension
C.
cannot mix each other
D.
water is lighter than oil
Ans:
surface tension
Explanation :
The separation of oil and water is caused due to the difference in surface tension of the two liquids. The water molecules stick together tightly and does not mix with the oil because water molecules are attracted to each other very strongly, forming an invisible "skin" of surface tension around each drop.
[13] Decibel is the unit of .
A.
Speed of light
B.
Intensity of sound
C.
Intensity of heat
D.
None of these
Ans:
Intensity of sound
Explanation :
Decibel (dB) unit is used for expressing the ratio between two amounts of electric or acoustic power for measuring the relative loudness of sounds.
[14] Magnetic keepers are pieces of –
A.
Nickel
B.
Cobalt
C.
Steel
D.
Soft iron
Ans:
Soft iron
Explanation :
Magnetic keepers arc pieces of soft iron that are placed across the poles of a bar magnet or a horseshoe magnet. They help prevent the loss of magnetism.
[15] Certain substances loose their electrical resistance completely at super low temperature. Such, substances are called.
A.
Super conductors
B.
Semi conductors
C.
Dielectrics
D.
Perfect conductors
Ans:
Super conductors
Explanation :
Superconductors are materials that carry electrical current with little or no resistance when cooled below a certain temperature. While conventional superconductors need to be cooled close to absolute zero (-273.15 °C) before they superconduct, high temperature superconductors do so above the boiling point of liquid nitrogen (-196 °C).
[16] In a transistor, the base is _.
A.
an insulator
B.
a conductor of low resistance
C.
a conductor of high resistance
D.
an extrinsic semiconductor
Ans:
a conductor of low resistance
Explanation :
A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit.
[17] Sound waves are produced by -
A.
Linear motion
B.
Circular motion
C.
Vibrating bodies
D.
Transitional motion
Ans:
Vibrating bodies
Explanation :
Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate.
[18] The weight of a body acts through the centre of –
A.
gravity
B.
mass
C.
both (1) and (2)
D.
buoyancy
Ans:
gravity
Explanation :
The centre of gravity of a collection of masses is the point where all the weight of the object can be considered to be concentrated. The entire weight acts through the center of gravity instead of acting through the individual masses. In a uniform gravitational field (like the field close to the surface of the Earth) the Centres of Gravity and Mass are in exactly the same place.
[19] A wheel-barrow is an example of –
A.
class III lever
B.
pulley system
C.
class I lever
D.
class II lever
Ans:
class II lever
Explanation :
In a Type 2 Lever, the load is between the pivot (fulcrum) and the effort. Examples of common tools that use a type 2 lever include: stapler, bottle opener, wheel barrow, nail clippers and nut cracker.
[20] The work done by the string of a simple pendulum during one complete oscillation is equal to –
A.
Total energy of the pendulum
B.
Kinetic energy of the pendulum
C.
Potential energy of the pendulum
D.
Zero
Ans:
Zero
Explanation :
Work done by the string of the simple pendulum during one complete oscillation is zero. Tension in the string exactly cancels the component parallel to the string. This leaves a net restoring force back to- ward the equilibrium position as equal to zero.
[21] The minimum number of forces to keep a particle in equilibrium is –
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
When the resultant of all forces acting on a particle is zero, the particle is in equilibrium. The equilibrium of a particle to which a single force is applied may be maintained by the application of a second force that is equal in magnitude and direction, but opposite in sense, to the first force.
[22] Which instrument is used to record the speed of a vehicle?
A.
Thermometer
B.
Barometer
C.
Speedometer
D.
Oscilloscope
Ans:
Speedometer
Explanation :
Speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled.
[23] Human ear responds to intensities in range -
A.
10-12Wm-2 to 1Wm-2
B.
15Wm-2 to 18Wm-2
C.
108Wm-2 to 2Wm-2
D.
10-3Wm-1 to 10-6Wm-1
Ans:
10-12Wm-2 to 1Wm-2
Explanation :
The human ear has an incredibly large range, being able to detect sound intensities from 1 x 10-12 W/m2 to 1 W/m2.
[24] Speed of sound in air depends on the -
A.
Chemical conditions
B.
Physical conditions
C.
Pitch
D.
None of these
Ans:
Physical conditions
Explanation :
Wind can increase or decrease the speed, and can even push sound waves sideways. Air density affects it. Temperature, pressure, humidity and gas mixture can each affect the density.
[25] The redness in atmosphere at Sunrise and Sunset is due to –
A.
Refraction of light
B.
Reflection of light
C.
Dispersion of light
D.
Scattering of light
Ans:
Scattering of light
Explanation :
The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. At sunrise or sunset, since the Sun is low on the horizon, the light rays must pass through more of the atmosphere #NAME?
Explanation :
The electron has a mass that is approximately 1/1836 that of the proton. Quantum mechanical properties of the electron include an intrinsic angular momentum (spin) of a half-integer value, expressed in units of the reduced Planck constant, ħ.
[12] Water drops cannot stick to the oily surface due to –
A.
lack of adhesive force
B.
surface tension
C.
cannot mix each other
D.
water is lighter than oil
Ans:
surface tension
Explanation :
The separation of oil and water is caused due to the difference in surface tension of the two liquids. The water molecules stick together tightly and does not mix with the oil because water molecules are attracted to each other very strongly, forming an invisible "skin" of surface tension around each drop.
[13] Decibel is the unit of .
A.
Speed of light
B.
Intensity of sound
C.
Intensity of heat
D.
None of these
Ans:
Intensity of sound
Explanation :
Decibel (dB) unit is used for expressing the ratio between two amounts of electric or acoustic power for measuring the relative loudness of sounds.
[14] Magnetic keepers are pieces of –
A.
Nickel
B.
Cobalt
C.
Steel
D.
Soft iron
Ans:
Soft iron
Explanation :
Magnetic keepers arc pieces of soft iron that are placed across the poles of a bar magnet or a horseshoe magnet. They help prevent the loss of magnetism.
[15] Certain substances loose their electrical resistance completely at super low temperature. Such, substances are called.
A.
Super conductors
B.
Semi conductors
C.
Dielectrics
D.
Perfect conductors
Ans:
Super conductors
Explanation :
Superconductors are materials that carry electrical current with little or no resistance when cooled below a certain temperature. While conventional superconductors need to be cooled close to absolute zero (-273.15 °C) before they superconduct, high temperature superconductors do so above the boiling point of liquid nitrogen (-196 °C).
[16] In a transistor, the base is _.
A.
an insulator
B.
a conductor of low resistance
C.
a conductor of high resistance
D.
an extrinsic semiconductor
Ans:
a conductor of low resistance
Explanation :
A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit.
[17] Sound waves are produced by -
A.
Linear motion
B.
Circular motion
C.
Vibrating bodies
D.
Transitional motion
Ans:
Vibrating bodies
Explanation :
Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate.
[18] The weight of a body acts through the centre of –
A.
gravity
B.
mass
C.
both (1) and (2)
D.
buoyancy
Ans:
gravity
Explanation :
The centre of gravity of a collection of masses is the point where all the weight of the object can be considered to be concentrated. The entire weight acts through the center of gravity instead of acting through the individual masses. In a uniform gravitational field (like the field close to the surface of the Earth) the Centres of Gravity and Mass are in exactly the same place.
[19] A wheel-barrow is an example of –
A.
class III lever
B.
pulley system
C.
class I lever
D.
class II lever
Ans:
class II lever
Explanation :
In a Type 2 Lever, the load is between the pivot (fulcrum) and the effort. Examples of common tools that use a type 2 lever include: stapler, bottle opener, wheel barrow, nail clippers and nut cracker.
[20] The work done by the string of a simple pendulum during one complete oscillation is equal to –
A.
Total energy of the pendulum
B.
Kinetic energy of the pendulum
C.
Potential energy of the pendulum
D.
Zero
Ans:
Zero
Explanation :
Work done by the string of the simple pendulum during one complete oscillation is zero. Tension in the string exactly cancels the component parallel to the string. This leaves a net restoring force back to- ward the equilibrium position as equal to zero.
[21] The minimum number of forces to keep a particle in equilibrium is –
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
When the resultant of all forces acting on a particle is zero, the particle is in equilibrium. The equilibrium of a particle to which a single force is applied may be maintained by the application of a second force that is equal in magnitude and direction, but opposite in sense, to the first force.
[22] Which instrument is used to record the speed of a vehicle?
A.
Thermometer
B.
Barometer
C.
Speedometer
D.
Oscilloscope
Ans:
Speedometer
Explanation :
Speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled.
[23] Human ear responds to intensities in range -
A.
10-12Wm-2 to 1Wm-2
B.
15Wm-2 to 18Wm-2
C.
108Wm-2 to 2Wm-2
D.
10-3Wm-1 to 10-6Wm-1
Ans:
10-12Wm-2 to 1Wm-2
Explanation :
The human ear has an incredibly large range, being able to detect sound intensities from 1 x 10-12 W/m2 to 1 W/m2.
[24] Speed of sound in air depends on the -
A.
Chemical conditions
B.
Physical conditions
C.
Pitch
D.
None of these
Ans:
Physical conditions
Explanation :
Wind can increase or decrease the speed, and can even push sound waves sideways. Air density affects it. Temperature, pressure, humidity and gas mixture can each affect the density.
[25] The redness in atmosphere at Sunrise and Sunset is due to –
A.
Refraction of light
B.
Reflection of light
C.
Dispersion of light
D.
Scattering of light
Ans:
Scattering of light
Explanation :
The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. At sunrise or sunset, since the Sun is low on the horizon, the light rays must pass through more of the atmosphere #NAME?
Explanation :
Decibel (dB) unit is used for expressing the ratio between two amounts of electric or acoustic power for measuring the relative loudness of sounds.
[14] Magnetic keepers are pieces of –
A.
Nickel
B.
Cobalt
C.
Steel
D.
Soft iron
Ans:
Soft iron
Explanation :
Magnetic keepers arc pieces of soft iron that are placed across the poles of a bar magnet or a horseshoe magnet. They help prevent the loss of magnetism.
[15] Certain substances loose their electrical resistance completely at super low temperature. Such, substances are called.
A.
Super conductors
B.
Semi conductors
C.
Dielectrics
D.
Perfect conductors
Ans:
Super conductors
Explanation :
Superconductors are materials that carry electrical current with little or no resistance when cooled below a certain temperature. While conventional superconductors need to be cooled close to absolute zero (-273.15 °C) before they superconduct, high temperature superconductors do so above the boiling point of liquid nitrogen (-196 °C).
[16] In a transistor, the base is _.
A.
an insulator
B.
a conductor of low resistance
C.
a conductor of high resistance
D.
an extrinsic semiconductor
Ans:
a conductor of low resistance
Explanation :
A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit.
[17] Sound waves are produced by -
A.
Linear motion
B.
Circular motion
C.
Vibrating bodies
D.
Transitional motion
Ans:
Vibrating bodies
Explanation :
Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate.
[18] The weight of a body acts through the centre of –
A.
gravity
B.
mass
C.
both (1) and (2)
D.
buoyancy
Ans:
gravity
Explanation :
The centre of gravity of a collection of masses is the point where all the weight of the object can be considered to be concentrated. The entire weight acts through the center of gravity instead of acting through the individual masses. In a uniform gravitational field (like the field close to the surface of the Earth) the Centres of Gravity and Mass are in exactly the same place.
[19] A wheel-barrow is an example of –
A.
class III lever
B.
pulley system
C.
class I lever
D.
class II lever
Ans:
class II lever
Explanation :
In a Type 2 Lever, the load is between the pivot (fulcrum) and the effort. Examples of common tools that use a type 2 lever include: stapler, bottle opener, wheel barrow, nail clippers and nut cracker.
[20] The work done by the string of a simple pendulum during one complete oscillation is equal to –
A.
Total energy of the pendulum
B.
Kinetic energy of the pendulum
C.
Potential energy of the pendulum
D.
Zero
Ans:
Zero
Explanation :
Work done by the string of the simple pendulum during one complete oscillation is zero. Tension in the string exactly cancels the component parallel to the string. This leaves a net restoring force back to- ward the equilibrium position as equal to zero.
[21] The minimum number of forces to keep a particle in equilibrium is –
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
When the resultant of all forces acting on a particle is zero, the particle is in equilibrium. The equilibrium of a particle to which a single force is applied may be maintained by the application of a second force that is equal in magnitude and direction, but opposite in sense, to the first force.
[22] Which instrument is used to record the speed of a vehicle?
A.
Thermometer
B.
Barometer
C.
Speedometer
D.
Oscilloscope
Ans:
Speedometer
Explanation :
Speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled.
[23] Human ear responds to intensities in range -
A.
10-12Wm-2 to 1Wm-2
B.
15Wm-2 to 18Wm-2
C.
108Wm-2 to 2Wm-2
D.
10-3Wm-1 to 10-6Wm-1
Ans:
10-12Wm-2 to 1Wm-2
Explanation :
The human ear has an incredibly large range, being able to detect sound intensities from 1 x 10-12 W/m2 to 1 W/m2.
[24] Speed of sound in air depends on the -
A.
Chemical conditions
B.
Physical conditions
C.
Pitch
D.
None of these
Ans:
Physical conditions
Explanation :
Wind can increase or decrease the speed, and can even push sound waves sideways. Air density affects it. Temperature, pressure, humidity and gas mixture can each affect the density.
[25] The redness in atmosphere at Sunrise and Sunset is due to –
A.
Refraction of light
B.
Reflection of light
C.
Dispersion of light
D.
Scattering of light
Ans:
Scattering of light
Explanation :
The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. At sunrise or sunset, since the Sun is low on the horizon, the light rays must pass through more of the atmosphere #NAME?
Explanation :
Superconductors are materials that carry electrical current with little or no resistance when cooled below a certain temperature. While conventional superconductors need to be cooled close to absolute zero (-273.15 °C) before they superconduct, high temperature superconductors do so above the boiling point of liquid nitrogen (-196 °C).
[16] In a transistor, the base is _.
A.
an insulator
B.
a conductor of low resistance
C.
a conductor of high resistance
D.
an extrinsic semiconductor
Ans:
a conductor of low resistance
Explanation :
A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit.
[17] Sound waves are produced by -
A.
Linear motion
B.
Circular motion
C.
Vibrating bodies
D.
Transitional motion
Ans:
Vibrating bodies
Explanation :
Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate.
[18] The weight of a body acts through the centre of –
A.
gravity
B.
mass
C.
both (1) and (2)
D.
buoyancy
Ans:
gravity
Explanation :
The centre of gravity of a collection of masses is the point where all the weight of the object can be considered to be concentrated. The entire weight acts through the center of gravity instead of acting through the individual masses. In a uniform gravitational field (like the field close to the surface of the Earth) the Centres of Gravity and Mass are in exactly the same place.
[19] A wheel-barrow is an example of –
A.
class III lever
B.
pulley system
C.
class I lever
D.
class II lever
Ans:
class II lever
Explanation :
In a Type 2 Lever, the load is between the pivot (fulcrum) and the effort. Examples of common tools that use a type 2 lever include: stapler, bottle opener, wheel barrow, nail clippers and nut cracker.
[20] The work done by the string of a simple pendulum during one complete oscillation is equal to –
A.
Total energy of the pendulum
B.
Kinetic energy of the pendulum
C.
Potential energy of the pendulum
D.
Zero
Ans:
Zero
Explanation :
Work done by the string of the simple pendulum during one complete oscillation is zero. Tension in the string exactly cancels the component parallel to the string. This leaves a net restoring force back to- ward the equilibrium position as equal to zero.
[21] The minimum number of forces to keep a particle in equilibrium is –
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
When the resultant of all forces acting on a particle is zero, the particle is in equilibrium. The equilibrium of a particle to which a single force is applied may be maintained by the application of a second force that is equal in magnitude and direction, but opposite in sense, to the first force.
[22] Which instrument is used to record the speed of a vehicle?
A.
Thermometer
B.
Barometer
C.
Speedometer
D.
Oscilloscope
Ans:
Speedometer
Explanation :
Speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled.
[23] Human ear responds to intensities in range -
A.
10-12Wm-2 to 1Wm-2
B.
15Wm-2 to 18Wm-2
C.
108Wm-2 to 2Wm-2
D.
10-3Wm-1 to 10-6Wm-1
Ans:
10-12Wm-2 to 1Wm-2
Explanation :
The human ear has an incredibly large range, being able to detect sound intensities from 1 x 10-12 W/m2 to 1 W/m2.
[24] Speed of sound in air depends on the -
A.
Chemical conditions
B.
Physical conditions
C.
Pitch
D.
None of these
Ans:
Physical conditions
Explanation :
Wind can increase or decrease the speed, and can even push sound waves sideways. Air density affects it. Temperature, pressure, humidity and gas mixture can each affect the density.
[25] The redness in atmosphere at Sunrise and Sunset is due to –
A.
Refraction of light
B.
Reflection of light
C.
Dispersion of light
D.
Scattering of light
Ans:
Scattering of light
Explanation :
The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. At sunrise or sunset, since the Sun is low on the horizon, the light rays must pass through more of the atmosphere #NAME?
Explanation :
Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate.
[18] The weight of a body acts through the centre of –
A.
gravity
B.
mass
C.
both (1) and (2)
D.
buoyancy
Ans:
gravity
Explanation :
The centre of gravity of a collection of masses is the point where all the weight of the object can be considered to be concentrated. The entire weight acts through the center of gravity instead of acting through the individual masses. In a uniform gravitational field (like the field close to the surface of the Earth) the Centres of Gravity and Mass are in exactly the same place.
[19] A wheel-barrow is an example of –
A.
class III lever
B.
pulley system
C.
class I lever
D.
class II lever
Ans:
class II lever
Explanation :
In a Type 2 Lever, the load is between the pivot (fulcrum) and the effort. Examples of common tools that use a type 2 lever include: stapler, bottle opener, wheel barrow, nail clippers and nut cracker.
[20] The work done by the string of a simple pendulum during one complete oscillation is equal to –
A.
Total energy of the pendulum
B.
Kinetic energy of the pendulum
C.
Potential energy of the pendulum
D.
Zero
Ans:
Zero
Explanation :
Work done by the string of the simple pendulum during one complete oscillation is zero. Tension in the string exactly cancels the component parallel to the string. This leaves a net restoring force back to- ward the equilibrium position as equal to zero.
[21] The minimum number of forces to keep a particle in equilibrium is –
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
When the resultant of all forces acting on a particle is zero, the particle is in equilibrium. The equilibrium of a particle to which a single force is applied may be maintained by the application of a second force that is equal in magnitude and direction, but opposite in sense, to the first force.
[22] Which instrument is used to record the speed of a vehicle?
A.
Thermometer
B.
Barometer
C.
Speedometer
D.
Oscilloscope
Ans:
Speedometer
Explanation :
Speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled.
[23] Human ear responds to intensities in range -
A.
10-12Wm-2 to 1Wm-2
B.
15Wm-2 to 18Wm-2
C.
108Wm-2 to 2Wm-2
D.
10-3Wm-1 to 10-6Wm-1
Ans:
10-12Wm-2 to 1Wm-2
Explanation :
The human ear has an incredibly large range, being able to detect sound intensities from 1 x 10-12 W/m2 to 1 W/m2.
[24] Speed of sound in air depends on the -
A.
Chemical conditions
B.
Physical conditions
C.
Pitch
D.
None of these
Ans:
Physical conditions
Explanation :
Wind can increase or decrease the speed, and can even push sound waves sideways. Air density affects it. Temperature, pressure, humidity and gas mixture can each affect the density.
[25] The redness in atmosphere at Sunrise and Sunset is due to –
A.
Refraction of light
B.
Reflection of light
C.
Dispersion of light
D.
Scattering of light
Ans:
Scattering of light
Explanation :
The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. At sunrise or sunset, since the Sun is low on the horizon, the light rays must pass through more of the atmosphere #NAME?
Explanation :
In a Type 2 Lever, the load is between the pivot (fulcrum) and the effort. Examples of common tools that use a type 2 lever include: stapler, bottle opener, wheel barrow, nail clippers and nut cracker.
[20] The work done by the string of a simple pendulum during one complete oscillation is equal to –
A.
Total energy of the pendulum
B.
Kinetic energy of the pendulum
C.
Potential energy of the pendulum
D.
Zero
Ans:
Zero
Explanation :
Work done by the string of the simple pendulum during one complete oscillation is zero. Tension in the string exactly cancels the component parallel to the string. This leaves a net restoring force back to- ward the equilibrium position as equal to zero.
[21] The minimum number of forces to keep a particle in equilibrium is –
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
When the resultant of all forces acting on a particle is zero, the particle is in equilibrium. The equilibrium of a particle to which a single force is applied may be maintained by the application of a second force that is equal in magnitude and direction, but opposite in sense, to the first force.
[22] Which instrument is used to record the speed of a vehicle?
A.
Thermometer
B.
Barometer
C.
Speedometer
D.
Oscilloscope
Ans:
Speedometer
Explanation :
Speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled.
[23] Human ear responds to intensities in range -
A.
10-12Wm-2 to 1Wm-2
B.
15Wm-2 to 18Wm-2
C.
108Wm-2 to 2Wm-2
D.
10-3Wm-1 to 10-6Wm-1
Ans:
10-12Wm-2 to 1Wm-2
Explanation :
The human ear has an incredibly large range, being able to detect sound intensities from 1 x 10-12 W/m2 to 1 W/m2.
[24] Speed of sound in air depends on the -
A.
Chemical conditions
B.
Physical conditions
C.
Pitch
D.
None of these
Ans:
Physical conditions
Explanation :
Wind can increase or decrease the speed, and can even push sound waves sideways. Air density affects it. Temperature, pressure, humidity and gas mixture can each affect the density.
[25] The redness in atmosphere at Sunrise and Sunset is due to –
A.
Refraction of light
B.
Reflection of light
C.
Dispersion of light
D.
Scattering of light
Ans:
Scattering of light
Explanation :
The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. At sunrise or sunset, since the Sun is low on the horizon, the light rays must pass through more of the atmosphere #NAME?
Explanation :
When the resultant of all forces acting on a particle is zero, the particle is in equilibrium. The equilibrium of a particle to which a single force is applied may be maintained by the application of a second force that is equal in magnitude and direction, but opposite in sense, to the first force.
[22] Which instrument is used to record the speed of a vehicle?
A.
Thermometer
B.
Barometer
C.
Speedometer
D.
Oscilloscope
Ans:
Speedometer
Explanation :
Speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled.
[23] Human ear responds to intensities in range -
A.
10-12Wm-2 to 1Wm-2
B.
15Wm-2 to 18Wm-2
C.
108Wm-2 to 2Wm-2
D.
10-3Wm-1 to 10-6Wm-1
Ans:
10-12Wm-2 to 1Wm-2
Explanation :
The human ear has an incredibly large range, being able to detect sound intensities from 1 x 10-12 W/m2 to 1 W/m2.
[24] Speed of sound in air depends on the -
A.
Chemical conditions
B.
Physical conditions
C.
Pitch
D.
None of these
Ans:
Physical conditions
Explanation :
Wind can increase or decrease the speed, and can even push sound waves sideways. Air density affects it. Temperature, pressure, humidity and gas mixture can each affect the density.
[25] The redness in atmosphere at Sunrise and Sunset is due to –
A.
Refraction of light
B.
Reflection of light
C.
Dispersion of light
D.
Scattering of light
Ans:
Scattering of light
Explanation :
The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. At sunrise or sunset, since the Sun is low on the horizon, the light rays must pass through more of the atmosphere #NAME?
Explanation :
The human ear has an incredibly large range, being able to detect sound intensities from 1 x 10-12 W/m2 to 1 W/m2.
[24] Speed of sound in air depends on the -
A.
Chemical conditions
B.
Physical conditions
C.
Pitch
D.
None of these
Ans:
Physical conditions
Explanation :
Wind can increase or decrease the speed, and can even push sound waves sideways. Air density affects it. Temperature, pressure, humidity and gas mixture can each affect the density.
[25] The redness in atmosphere at Sunrise and Sunset is due to –
A.
Refraction of light
B.
Reflection of light
C.
Dispersion of light
D.
Scattering of light
Ans:
Scattering of light
Explanation :
The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. At sunrise or sunset, since the Sun is low on the horizon, the light rays must pass through more of the atmosphere #NAME?
Explanation :
The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. At sunrise or sunset, since the Sun is low on the horizon, the light rays must pass through more of the atmosphere #NAME?