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Mechanics and Properties of Matter


7. 

Analyse the statements and choose the correct answer:
Assertion (A): A particle moves along a circle.
Resertion (R-I ): speed is uniform.
(R-II ): Velocity is changing

Answer : D. Both are correct

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8. 

A girl is swinging on a swing in sitting position. When the same girl stands up, the period of swing will

Answer : A. be shorter

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9. 

A simple machine helps a person doing

Answer : B. the same amount of work with lesser force

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10. 

The normal boiling point of a liquid is the temperature at which

Answer : D. the vapour pressure of the liquid is equal to the atmospheric pressure

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11. 

the density of pure water will be

Answer : A. maximum at 4oC

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12. 

If the depth of floatation of a ship changes when it sails from the Arabian sea to the Indian ocean, it is due to

Answer : D. change in density of sea-water

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