| 1 |
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
|
| 2 |
When a force of 0.5 N displaces a body through a distance of 2m in the direction of force, the work done is
|
A. 0.5 J
B. 2 J
C. 0.25 J
D. 1 J
|
| 3 |
A boy pulls a toy car through a distance of 5 m by applying a force of 0.5 N, which makes and angle of 60° with the horizontal. The work done by the boy is:
|
A. 1.25 J
B. 12.5 J
C. 125 J
D. None of these
|
| 4 |
The amount of coal used since 1945 up till now as compared to that used in the whole of history before that is
|
A. Much more
B. Very small
C. No amount at all
D. None of these
|
| 5 |
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°
|
| 6 |
Work is a Quantity
|
A. Vector
B. Scalar
C. Non-physical
D. None of these
|
| 7 |
The space around the earth within which it expects a force of attraction on other bodies is known as:
|
A. Nuclear field
B. Conservative field
C. Electric field
D. Gravitational field
|
| 8 |
The work done moving a body between two points in a conservation field is independent of the:
|
A. Direction
B. Force applied
C. Path followed by the body `
D. Power
|
| 9 |
The angle between centripetal force and displacement of the body moving in a circle is:
|
A. 0°
B. 90°
C. 180°
D. None of these
|
| 10 |
A laborer carrying a load on his head moves from the 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
|
| 11 |
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
|
| 12 |
Energy stored in the spring of a watch is called
|
A. Potential energy
B. Kinetic energy
C. Nuclear energy
D. Elastic potential
|
| 13 |
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
|
| 14 |
Work is a
|
A. Scalar quantity
B. Vector quantity
C. Base quantity
D. None of these
|
| 15 |
Work has a dimension as that of:
|
A. Torque
B. Angular momentum
C. Linear momentum
D. Power
|
| 16 |
A 100 kg car is moving at a speed of 10 m/sec and comes to rest after covering a distance of 50 m. the amount of work done against friction is:
|
A. +5 x 101J
B. +5 x 102J
C. +5 x 103J
D. +5 x 104J
|
| 17 |
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
|
| 18 |
The types of mechanical energy is/are:
|
A. Kinetic energy
B. Potential energy
C. Both of these
D. None of these
|
| 19 |
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
|
| 20 |
A solar cell is made from:
|
A. Iron
B. Silicon
C. Germanium
D. Copper
|
| 21 |
Work done on a body by gravity in lifting it up to certain height is
|
A. Maximum
B. Minimum
C. Zero
D. Negative
|
| 22 |
The work done in moving a body between two points in a conservation field is independent of the:
|
A. Direction
B. Force applied
C. Path followed by the body
D. Power
|
| 23 |
Work is a scalar product of
|
A. Force, Velocity
B. Velocity, Displacement
C. Force, Displacement
D. Force, Momentum
|
| 24 |
A field in which the work done in moving a body along closed path is zero is called
|
A. Nuclear Field
B. Conservative field
C. Gravitational field
D. Non-conservative field
|
| 25 |
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
|
| 26 |
The dimensions of work
|
A. [MLT-1]
B. [MLT-2]
C. [ML2T-2]
D. [MLT]
|
| 27 |
When a falling body hits ground, its KE changes to _____ energy.
|
A. Potential
B. Chemical
C. Mechanical
D. sound and heat
|
| 28 |
The ultimate source of money sources of energy is:
|
A. Sun
B. Air
C. Water
D. Petroleum
|
| 29 |
Watt x second is unit of:
|
A. Force
B. Work
C. Power
D. None of these
|
| 30 |
Which force is not a conservative force:
|
A. Frictional force
B. Gravitational force
C. Electric force
D. Elastic spring force
|