Work And Energy
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- 1.
![A man is carrying the heavy luggage from one platform to the other of a Railway station but still according to the logics of science his work done is said to be zero. Can you opt out the correct reason?]( "A man is carrying the heavy luggage from one platform to the other of a Railway station but still according to the logics of science his work done is said to be zero. Can you opt out the correct reason?")
- A.
The force is acting along the direction of displacement of luggage
- B.
The force is acting perpendicular to the direction of displacement of luggage
- C.
The force is acting opposite to the direction of displacement of luggage
- D.
None of these
- 2.
- A.
Centripetal force acts in the direction of motion of the body
- B.
Centripetal force acts along the radius of circular path
- C.
Gravitational force acts along the radius of circular path
- D.
Centrifugal force acts perpendicular to the radius of circular path
- 3.
- A.
Becomes twice to that of the initial
- B.
Becomes four times to that of the initial
- C.
Remains the same
- D.
Becomes 16 times to that of the initial
- 4.
- A.
25
- B.
2.5
- C.
0.25
- D.
5
- 5.
- A.
Kilowatt
- B.
Kilowatt hour
- C.
Joule
- D.
Newton meter
- 6.
![You would have observed a runner who possesses only kinetic energy due to his motion. Can you guess which form of energy does a flying bird have?]( "You would have observed a runner who possesses only kinetic energy due to his motion. Can you guess which form of energy does a flying bird have?")
You would have observed a runner who possesses only kinetic energy due to his motion. Can you guess which form of energy does a flying bird have?- A.
Kinetic energy
- B.
Potential energy
- C.
Both kinetic and potential energy
- D.
Can’t say
- 7.
- A.
Kinetic energy and electrical energy
- B.
Potential energy and kinetic energy
- C.
Potential energy and electrical energy
- D.
Kinetic energy and potential energy
- 8.A man of mass 50 kg jumps to a height of 1 m. His potential energy at the highest point is (g = 10 m/s2):
- A.
50 J
- B.
500 J
- C.
5 J
- D.
5000 J
- 9.The type of energy possessed by a simple pendulum, when it is at the mean position is:
- A.
Kinetic energy
- B.
Potential energy
- C.
Kinetic + Potential energy
- D.
Sound energy
- 10.A body is falling from a height h. After it has fallen to a height of h/2, it will possess:
- A.
Only kinetic energy
- B.
Half kinetic and half potential energy
- C.
Only potential energy
- D.
More kinetic and less potential energy
- 11.Two objects of masses 1 x 10-3 kg and 4 x 10-3 kg have equal momentum. What is the ratio of their kinetic energies?
- A.
2:1
- B.
4:1
- C.
1:4
- D.
1:2
- 12.The work done on an object does not depend upon the:
- A.
Angle between force and displacement
- B.
Force applied
- C.
Initial velocity of the object
- D.
Displacement
- 13.An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same:
- A.
Potential energy
- B.
Momenta
- C.
Acceleration
- D.
Kinetic energy
- 14.A microphone converts:
- A.
Sound energy into mechanical energy in stereo system
- B.
Sound energy into electrical energy in public address system
- C.
Electrical energy into sound energy in ordinary telephone
- D.
Microwave energy into sound energy in a mobile phone
- 15.Which of the following energy change involves frictional force?a) Potential energy to sound energyb) Chemical energy to heat energyc) Kinetic energy to heat energyd) Chemical energy to heat energyChoose the correct option among the following:
- A.
Both a and b
- B.
Only d
- C.
Both b and c
- D.
Only c
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