An athlete runs before long jump to get advantage on:
Important Questions on Physics
Railway tracks are banked on curves so that:
In each of the following questions, a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements, mark the correct answer as:
Assertion (A): Forces always do a work.
Reason (R): Work is defined on the product of force and displacement caused by force.
Codes:
In each of the following questions, a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements, mark the correct answer as:
Assertion (A): On a rainy day, it is difficult to drive a car or bus at high speed.
Reason (R): The value of coefficient of friction is lowered due to wetting of the surface.
Codes:
In each of the following questions, a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements, mark the correct answer as:
Assertion (A): When a bicycle is in motion, the force of friction exerted by the ground on the two wheels is always in forward direction.
Reason (R): The frictional force acts only when the bodies are in contact.
Codes:
| List-I | List-II |
| A. Static friction | 1. is slightly less than limiting friction. |
| B. Dynamic friction | 2. is maximum value of static friction. |
| C. Limiting friction | 3. is equal to tangent of angle of repose. |
| D. Coefficient of friction | 4. is self-adjusting. |
Codes:
