Mechanical Physics MCQ question and answer with solution

71

The most important property of nanomaterial is

A) Force B) Friction C) Pressure D) Temperature

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Answer & Solution

Answer: Option B

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72

According to Archimedes principle, the upward force experienced by a body immersed in a fluid is equal to which of the following?

A) Total weight of the body and the fluid B) Weight of the fluid displaced by the body C) Weight of the body D) Weight of the total fluid

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Answer & Solution

Answer: Option B

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73

Center of buoyancy always-

A) coincide with the centre of gravity B) coincides with the centroid of the volume of fluid displaced C) remains above the centre of gravity D) remains below the centre of gravity

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Answer & Solution

Answer: Option B

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74

Consider the following statements.
1. Surface tension of liquid depends on length but not on the area, like the elastic property.
2. SI unit of surface tension is N/m.
3. Surface tension is a scalar quantity because it has no specific direction for a given liquid.
Which of the statement(s) given above is/are correct?

A) 1 and 2 B) Only 3 C) 2 and 3 D) 1, 2 and 3

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Answer & Solution

Answer: Option D

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75

The clouds float in the atmosphere because of their low

A) Temperature B) Velocity C) Pressure D) Density

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Answer & Solution

Answer: Option D

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76

If ice floating on water in a vessel melts, the water level in the vessel . . . . . . . .

A) increases B) does not change C) first increases before decreasing D) decreases

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Answer & Solution

Answer: Option C

Solution:

Correct Answer: B: does not change

Here's why the water level doesn't change when ice floating in water melts:

* Archimedes' Principle: An object floating in water displaces its own weight of water.
* Ice's Weight: The weight of the ice is exactly equal to the weight of the water it displaces when floating.
* Melting Ice: When the ice melts, it turns into water.
* Volume of Melted Ice: The volume of water produced by the melted ice is exactly the same as the volume of water the ice displaced when it was floating.
* Conclusion: Because the melted ice contributes the same volume as the water it initially displaced, the water level remains the same.

77

The pressure of the earth's atmosphere at sea level is due to the

A) heating of the atmosphere by the sun B) fact that most living things constantly breathe air C) evaporation of water from the seas and oceans D) gravitational attraction of the earth for the atmosphere

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Answer & Solution

Answer: Option D

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78

When a ship enters a sea from a river, what happens?

A) It rises a little B) It remains at the same level C) It sinks a little D) It immersed in the bottom of the sea

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Answer & Solution

Answer: Option A

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79

Upthrust force and weight of object would be-

A) In the below direction B) In the opposite direction C) Up above D) In the same direction

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Answer & Solution

Answer: Option B

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80

What would be the force generated by a wall on which water strike normally at a speed of 10 m/s and at a discharge of 0.0001 m³/sec?

A) 1 Newton B) 0.1 Newton C) 10 Newton D) 100 Newton

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Answer & Solution

Answer: Option A

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