Mechanical Physics MCQ question and answer with solution

51

When a body is completely or partially immersed in a fluid, this body experiences a force equal to the weight of the displaced fluid, this principle is known as

A) Pascal's law B) Archimedes' principle C) Stocks law D) Newton's law of motion

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Answer & Solution

Answer: Option B

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52

Along a streamline flow of fluid,

A) the velocity of all fluid particles at a given instant is constant B) the speed of a fluid particle remains constant C) the velocity of all fluid particles crossing a given position is constant D) the velocity of a fluid particle remains constant

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Answer & Solution

Answer: Option C

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53

1 pascal equal 1 . . . . . . . .

A) N m² B) N m^-2 C) N m D) N m^-1

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Answer & Solution

Answer: Option B

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54

The temperature during solid melting-

A) Can increase or decrease according to the nature of the substance B) Grows up C) Decreases D) Do not change

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Answer & Solution

Answer: Option D

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55

Two cars, passing each other at high speed, are in danger of side swiping because

A) of the increase in air pressure in the space between them B) of decrease in the velocity of air molecules between them C) of decrease in air pressure in the space between them D) of the increase in the velocity of air molecules between them

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Answer & Solution

Answer: Option C

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56

Bernoulli's theorem deals with the principle of conservation of-

A) Momentum B) Force C) Mass D) Energy

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Answer & Solution

Answer: Option D

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57

The elastic potential energy of a body is
1. Work done by the external force against the deforming force.
2. Work done against the external force by the deforming force.
3. The sum of work done by the external force and the deforming force.
Which one option is true?

A) Only 1 B) 1 and 3 C) 1, 2 and 3 D) None of these

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Answer & Solution

Answer: Option A

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58

Which of the following options is true with respect to diffusion of gases with respect to solid and liquid?

A) Diffusion rate of a fluid is higher than that of gases or gas B) Diffusion rate of gases is higher than that of liquid and/or solid C) The diffusion rate of the solid is higher than that of liquid or gas D) Diffusion rates of gases are lower than those of liquids and solids

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Answer & Solution

Answer: Option B

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59

The spring balance works on the principle of . . . . . . . .

A) Boyle's Law B) Hooke's Law C) Bernoulli's Principle D) Pascal's Law

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Answer & Solution

Answer: Option B

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60

Longitudinal strain is defined when

A) under a large force change in length is smaller B) under a weak force change in length be smaller C) under a large force change in length is larger D) None of the above

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Answer & Solution

Answer: Option A

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Mechanical Physics MCQ question and answer with solution | Physics Gk MCQs