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If a body is rotating, is it necessarily...

If a body is rotating, is it necessarily being acted upon by an external torque ?

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No, torque is required only for angular acceleration.
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PREMIERS PUBLISHERS-MOTION OF SYSTEM OF PARTICLES AND BODIES-OTHER IMPORTANT QUESTIONS & ANSWER (VERY SHORT ANSWER QUESTIONS)
  1. When an equation for velocity and acceleration of CM.

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  2. Does moment of inertia of a body change with the change of the axis of...

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  3. If a body is rotating, is it necessarily being acted upon by an extern...

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  4. On what factors does the turning effect of a force depend?

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  5. A system is in stable equilibrium. What can we say about its potential...

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  6. What effect does couple have on a body?

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  7. Write an expression for mechanical advantage.

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  8. Factors on which radius of gyration of the body depends.

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  9. What is rolling motion?

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  10. What do you mean by Rigid body?

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  11. Should the centre of mass of a body necessarily lie inside the body?

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  12. On what factors does the position of cm of a rigid body depend ?

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  13. When an equation for velocity and acceleration of CM.

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  14. Does the moment of inertia of a body change with the speed of rotatio...

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  15. If a body is rotating, is it necessarily being acted by an external to...

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  16. On what factors does the turning effect of a force depend?

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  17. A system is in stable equilibrium. What can we say about its potential...

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  18. What effect does couple have on a body?

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  19. Write an expression for mechanical advantage.

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  20. Factors on which radius of gyration of the body depends.

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