Question

MCQ :-

⭐️ 1) A body floats in a liquid contained in a beaker. The whole system falls freely under gravity. The upward thrust on the body due to the liquid then is :

(a) zero
(b) equal to the liquid displaced
(c) equal to the weight of the body in air.
(d) equal to the weight of the immersed portion in the liquid.

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⭐️ 2) Clouds float in the atmosphere on account of their :
(a) low viscosity
(b) low density
(c) low temperature
(d) creation of low pressure

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⭐️ 3) After terminal velocity to reached, the acceleration of a body falling through a fluid is :
(a) equal to 'g'
(b) zero
(c) less than 'g'
(d) more than 'g'

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⭐️ 4) The property by virtue of which a fluid tries to prevent the relative motion between adjacent layers is called :
(a) Elasticity
(b) Rigidity
(c) Viscosity
(d) Cohesion

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⭐️ 5) Which one of the following substance has the greatest viscosity ?
(a) water
(b) mercury
(c) oxygen
(d) hydrogen

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⭐️ 6) According to Hooke's law of Elasticity, if stress is increased the ratio of stress to strain :
(a) increases
(b) decreases
(c) becomes zero
(d) remains constant

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⭐️ 7) Within elastic limit, stress is :
(a) zero
(b) independent of strain
(c) directly proportional to strain
(d) inversel proportional to strain

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⭐️ 8) A drop of liquid assumed spherical shape because of :
(a) density
(b) viscosity
(c) gravitation
(d) Surface tension

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Answer 1

1.a

2.b

3.a

4.c

5.b

6.d

7.c

8.d