| 1 |
Tick the conservative force
|
A. Tension in a string
B. Air resistance
C.Elastic spring
D. Frictional force
|
| 2 |
Which force is not a conservative force:
|
A. Frictional force
B. Gravitational force
C.Electric force
D. Elastic spring force
|
| 3 |
When two protons are brought are brought closer potential energy of both of them:
|
A. Increases
B. Decreases
C.Remains same
D. None of these
|
| 4 |
Work is a always done on a body when
|
A. A force acts on it
B. It moves through certain distance
C.None of A or B is correct
D. Both A and B are correct
|
| 5 |
SI Unit of work is
|
A. Nm-1
B. Joule
C.Nms
D. Both a and b
|
| 6 |
The Space around the Earth within which it exerts a force of attraction on other bodies is known as
|
A. Nuclear field
B. Conservative field
C.Electric field
D. Gravitational field
|
| 7 |
The ultimate source of money sources of energy is:
|
A. Sun
B. Air
C.Water
D. Petroleum
|
| 8 |
Work is a
|
A. Scalar quantity
B. Vector quantity
C.Base quantity
D. None of these
|
| 9 |
Escape velocity from surface of Moon as compared to that from Earth surface is:
|
A. Greater
B. Smaller
C.Equal
D. None of thes
|
| 10 |
The work done in moving a body between two points in a conservative field is independent of the
|
A. Direction
B. Force applied
C.Path followed by the body
D. Power
|
| 11 |
A solar cell is made from:
|
A. Iron
B. Silicon
C.Germanium
D. Copper
|
| 12 |
When a body moves against the force of friction on a horizontal plane, the work done by the body is:
|
A. Positive
B. Negative
C.Zero
D. None of these
|
| 13 |
Which of the following type of force can do no work on the particle on which it acts:
|
A. Frictional force
B. Gravitational force
C.Electric force
D. Centripetal force
|
| 14 |
A body moves a distance of 10 m along a straight line under the action of a force of 5 N and work done is 25J. The angle which the force makes the direction of motion will be:
|
A. 60°
B. 90°
C.30°
D. 0°
|
| 15 |
The work performed on an object does not depend on
|
A. Force applied
B. Angle at which force is inclined to the displacement
C.Initial velocity of the object
D. Displacement
|
| 16 |
A labourer carrying a distance a load on his head moves from rest on a horizontal road to another point where he comes to rest. He has done:`
|
A. Minimum work
B. Maximum work
C.Zero work
D. Negative work
|
| 17 |
When force and displacement are perpendicular to each other than work is equal to
|
A. Unity
B. Infinity
C.Zero
D. -Fd
|
| 18 |
The work done by a force keeping an object in circular motion with constant speed is:
|
A. Zero J.
B. 0.1 J
C.1 J
D. 0.01 J
|
| 19 |
Teh consumption of energy by a 1000 watt heater in half an hour is:
|
A. 5 Kwh
B. 0.5 Kwh
C.2.5 Kwh
D. 3.2 Kwh
|
| 20 |
A body moves a distance of 10 m among a straight line under the action of a force of 5 N. If the work done is 25 J, the angle which the force makes with the direction of motion of a body is:
|
A. 0°
B. 30°
C.60°
D. 90°
|
| 21 |
Work has the dimensions as that of
|
A. Torque
B. Angular momentum
C.Linear momentum
D. Power
|
| 22 |
The consumption of energy by a 60 W bulb in 2 minutes is:
|
A. 2 watt-hour
B. 120 watt-hour
C.30 watt-hour
D. None of these
|
| 23 |
Work is always done on a body when:
|
A. A force acts on it
B. It moves through certain distance
C.None of A or B is correct
D. Both A and B is correct
|
| 24 |
Work is a Quantity
|
A. Vector
B. Scalar
C.Non-physical
D. None of these
|
| 25 |
The tidal energy is due to gravitational pull of :
|
A. sun
B. moon
C.Mars
D. None of these
|
| 26 |
The value of escape velocity of Earth planet comes out to be:
|
A. 11 m/sec
B. 11 km/sec
C.11 km/hour
D. 11 cm/sec
|
| 27 |
Work has the dimension as that of:
|
A. Torque
B. Angular momentum
C.Linear momentum
D. Power
|
| 28 |
A 100 Kg car is moving at the speed of 10 m/sec and comes to rest after covering a distance of 50 m. The amount of work done against the friction is:
|
A. +5 X 101J
B. +5 X 102J
C.+5 X 103J
D. +5 X 104J
|
| 29 |
The work done by a force, keeping an object in circular motion with constant speed is:
|
A. Zero J
B. 1 J
C.0.1 J
D. 0.01 J
|
| 30 |
Which of the following types of force can do no work on the particle on which it acts
|
A. Frictional force
B. Gravitational force
C.Electric force
D. Centripetal force
|