Mechanical Physics MCQ question and answer with solution

1

Density of water is

A) maximum at 0°C B) minimum at 0°C C) maximum at 4°C D) minimum at -4°C

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Answer & Solution

Answer: Option C

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2

The body is called perfectly plastic body

A) if the body completely gain its original shape after removal of deforming force B) if the body remains in deformed shape even after removal of the deforming force C) if weight of the body is equal to force of buoyancy D) None of the above

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Answer & Solution

Answer: Option B

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3

Pressure is a scalar quantity because

A) it is the ratio of force to area and both force and area are vectors B) it is the ratio of magnitude of force to area C) it is the ratio of component of force (normal to area) to area D) None of the above

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Answer & Solution

Answer: Option A

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4

Why do water droplets always take a round shape when dropped onto plane surfaces?

A) Due to gravity B) Due to atmospheric pressure C) Due to the presence of Eddy current in the air D) Due to exertion of surface tension by the molecules

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Answer & Solution

Answer: Option D

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5

In which situation the molecular attraction is very strong?

A) Solid B) Fluid C) The Gas D) Steam

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Answer & Solution

Answer: Option A

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6

The force of buoyancy depends on the density and . . . . . . . . of the liquid displaces.

A) The direction B) Volume C) Power D) Energy

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Answer & Solution

Answer: Option B

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7

Which one of the following statement is not correct?

A) In steady flow of a liquid, the velocity of liquid particles reaching at a particular point is the same at all points B) Steady flow is also called streamlined flow C) In steady flow, each particle may not follow the same path as taken by a previous particle passing through that point D) Two streamlines cannot intersect with each other

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Answer & Solution

Answer: Option C

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8

If two miscible liquids of same volume but different densities ρ₁ and ρ₂ are mixed, then the density of the mixture is given by

A) $$\frac{{{\rho _1} + {\rho _2}}}{2}$$ B) $$\frac{{2{\rho _1}{\rho _2}}}{{{\rho _1} + {\rho _2}}}$$ C) $$\frac{{2{\rho _1}{\rho _2}}}{{{\rho _1} - {\rho _2}}}$$ D) $$\frac{{{\rho _1}{\rho _2}}}{{{\rho _1} + {\rho _2}}}$$

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Answer & Solution

Answer: Option B

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9

Assertion (A): An iron ball floats on mercury but gets immersed in water.
Reason (R): The specific gravity of iron is more than that of mercury.

A) Both (A) and (R) are true and (R) is the correct explanation of (A) B) Both (A) and (R) are true, but (R) is not the correct explanation of (A) C) (A) is true, but (R) is false D) (A) is false, but (R) is true

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Answer & Solution

Answer: Option C

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10

Two capillary tubes of different diameters are dipped in water. The rise of water is

A) same in both tubes B) greater in the tube of smaller diameter C) greater in the tube of larger diameter D) None of the above

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Answer & Solution

Answer: Option B

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