Time Left:
600
sec
1. Which of the following is not correct for the condition for work not to be done:
A. force and displacement are perpendicular to each other.
B. force and displacement are at 180 degrees with each other
C. displacement is zero, though force is non-zero
D. force is zero
2. There are two bodies X and Y with equal kinetic energy but different masses m and 4m respectively. The ratio of their linear momentum is-
A. 1:2
B. 4:1
C. 1:√2
D. 1:4
3. Which of the following is not an example of zero work?
A. The work done by the tension in the string, when a body tied with the string move along a circular path.
B. When a horse pulls a cart on a level road.
C. The work done by a coolie when he travels on a horizontal platform, with a load on his head.
D. When a person holds some amount of load but, does not move from his position.
5. Which of the following is not a unit of energy?
A. newton metre
B. electron volt
C. joule/metre
D. kilowatt hour
6. Which of the following statements is false:
A. kinetic energy is positive
B. potential energy is positive
C. kinetic energy is negative
D. potential energy is negative
7. Raindrops fall on the earth with certain kinetic energy on the earth. From where do they get this energy?
A. Chemical Energy
B. Gravitational Potential Energy
C. Energy between molecules of water
D. Heat Energy
8. Time rate at which work is done by a force is
A. Power
B. Torque
C. Centrifugal Force
D. Acceleration
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