Question (1):
Work done = Force x _______
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| 1. |
distance
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| 2. |
acceleration
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| 3. |
velocity
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| 4. |
speed
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| Ans: 1 |
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Question (2):
1 joule = 1 _______
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| 1. |
N m2
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| 2. |
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| 3. |
N m
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| 4. |
N2 m2
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| Ans: 3 |
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Question (3):
Which form of energy does the flowing water possess?
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| 1. |
gravitational energy
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| 2. |
potential energy
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| 3. |
electrical energy
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| 4. |
kinetic energy
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| Ans: 4 |
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Question (4):
A body of mass 2 kg is dropped from a height of 1m. Its kinetic energy as it touches the ground is _______
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| 1. |
19.6 N
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| 2. |
19.6 J
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| 3. |
19.6 kg
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| 4. |
19.6 m
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| Ans: 2 |
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Question (5):
The unit of power is _______
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| 1. |
watt per second
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| 2. |
joule
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| 3. |
kilojoule
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| 4. |
joule per second
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| Ans: 4 |
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Question (6):
3730 watts = ______h.p.
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|
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| Ans: 1 |
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Question (7):
A coolie carries a load of 500 N to a distance of 100 m. The work done by him is
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| 1. |
5 N
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| 2. |
50,000 Nm
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| 3. |
0
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| 4. |
1/5 N
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| Ans: 3 |
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Question (8):
The P.E. of a body at a certain height is 200 J. The kinetic energy possessed by it when it just touches the surface of the earth is
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| 1. |
> P.E.
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| 2. |
< P.E.
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| 3. |
= P.E.
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| 4. |
cannot be known
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|
| Ans: 1 |
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Question (9):
Power is a measure of the _______
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| 1. |
rate of change of momentum
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| 2. |
force which produces motion
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| 3. |
change of energy
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| 4. |
rate of change of energy
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| Ans: 4 |
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Question (10):
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?
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| 1. |
4:1
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| 2. |
2:1
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| 3. |
16:1
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| 4. |
|
|
| Ans: 1 |
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Question (11):
A 40 newton object is released from a height of 10 m. Just before it hits the ground, its kinetic energy, in joules is _______
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| 1. |
400
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| 2. |
3920
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| 3. |
2800
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| 4. |
4000
|
|
| Ans: 1 |
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Question (12):
If the speed of an object is doubled then its kinetic energy is _______
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| 1. |
doubled
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| 2. |
quadrupled
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| 3. |
halved
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| 4. |
tripled
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| Ans: 2 |
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Question (13):
1.5 kW = ______ watts
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| 1. |
1500
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| 2. |
150
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| 3. |
15000
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| 4. |
15
|
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| Ans: 1 |
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Question (14):
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)
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| 1. |
50 J
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| 2. |
60 J
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| 3. |
500 J
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| 4. |
600 J
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|
| Ans: 3 |
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Question (15):
The type of energy possessed by a simple pendulum, when it is at the mean position is
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| 1. |
kinetic energy
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| 2. |
potential energy
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| 3. |
potential energy + kinetic energy
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| 4. |
sound energy
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| Ans: 1 |
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Question (16):
An iron sphere of mass 30 kg has the same diameter as an aluminium sphere whose mass is 10.5 kg. The spheres are dropped simultaneously from a cliff. When they are 10 m from the ground, they have the same _______.
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| 1. |
acceleration
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| 2. |
momentum
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| 3. |
potential energy
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| 4. |
kinetic energy
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| Ans: 1 |
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Question (17):
A 1 kg mass has a kinetic energy of 1 joule when its speed is
|
| 1. |
0.45 m/s
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| 2. |
1 m/s
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| 3. |
1.4 m/s
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| 4. |
4.4 m/s
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| Ans: 3 |
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Question (18):
If air resistance is negligible, the sum total of potential and kinetic energies of a freely falling body _______
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| 1. |
increases
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| 2. |
decreases
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| 3. |
becomes zero
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| 4. |
remains the same
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| Ans: 4 |
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Question (19):
Name the physical quantity which is equal to the product of force and velocity.
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| 1. |
work
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| 2. |
energy
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| 3. |
power
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| 4. |
acceleration
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|
| Ans: 3 |
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Question (20):
An object of mass 1 kg has potential energy of 1 joule relative to the ground when it is at a height of _______.
|
| 1. |
0.102 m
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| 2. |
1 m
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| 3. |
9.8 m
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| 4. |
32 m
|
|
| Ans: 1 |
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