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11 .
The bodies which rebound after impact are called
| A. | inelastic bodies |
| B. | elastic bodies |
| C. | neither elastic nor inelastic bodies |
| D. | none of these |
12 .
The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as
| A. | static friction |
| B. | dynamic friction |
| C. | limiting friction |
| D. | coefficient of friction |
13 .
The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is known as
| A. | principle of independence of forces |
| B. | principle of resolution of forces |
| C. | principle of transmissibility of forces |
| D. | none of these |
14 .
The angle between two forces when the resultant is maximum and minimum respectively are
| A. | 0° and 180° |
| B. | 180° and 0° |
| C. | 90° and 180° |
| D. | 90° and 0° |
15 .
When a rigid body is suspended vertically, and it oscillates with a small amplitude under the action of the force of gravity, the body is known as
| A. | simple pendulum |
| B. | compound pendulum |
| C. | torsional pendulum |
| D. | second's pendulum |
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