Mechanical Physics MCQ question and answer with solution

21

Kerosene oil rises up in the wick of lantern because of

A) surface tension B) buoyant force of air C) diffusion of the oil through the wick D) the gravitational pull of the wick

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Answer & Solution

Answer: Option A

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22

A liquid is kept in a glass beaker. Which one of the following statements is correct regarding the pressure exerted by the liquid column at the base of the beaker?

A) The pressure depends on the area of the base of the beaker B) The pressure depends on the height of liquid column C) The pressure does not depend on the density of the liquid D) The pressure neither depends on the area of the base of the beaker nor on the height of liquid column

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Answer & Solution

Answer: Option B

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23

Which of the following statements is incorrect?

A) If the buoyancy force is less than the weight of the object then the object sinks B) If the buoyancy force is greater than the weight of the object, the object floats C) If the buoyancy force is less than the weight of the object, the object floats D) If the buoyancy force is equal to the weight of the object, the object floats inside the liquid

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Answer & Solution

Answer: Option C

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24

What is the force acting perpendicular to plane?

A) Upthrust B) Abusive C) Pressure D) Pull

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Answer & Solution

Answer: Option A

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25

Consider the following statements.
1. The SI unit of young's modulus of elasticity is N/M².
2. The reciprocal of the bulk modulus of the material of the body is called the compressibility of that material.
3. Compressibility of gases is very small.
Which of the statements given above are correct?

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

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Answer & Solution

Answer: Option C

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26

The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. Why?
Following are some options

A) Ice is a bad conductor of heat B) Since, the surface of the lake is at the same temperature as the air no heat is lost C) The density of water is maximum at 4°C D) None of the above

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Answer & Solution

Answer: Option C

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27

A sudden fall in barometer reading indicates that the weather will be

A) Stormy weather B) Rainy weather C) Cool dry weather D) Hot and humid weather

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Answer & Solution

Answer: Option A

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28

For which one of the following capillarity is not the only reason?

A) Blotting of ink B) Rising of underground water C) Spread of water drop on a cotton cloth D) Rising of water from the roots of a plant to its foliage

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Answer & Solution

Answer: Option D

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29

When an air bubble at the bottom of lake rises to the top, it will

A) Increased in size B) Decreased in size C) Maintain its size D) Flatten into a disc like shape

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Answer & Solution

Answer: Option A

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30

Consider the following statements.
1. The viscosity of a gas increases with rise in temperature.
2. The viscosity of the liquid falls very rapidly with rise in temperature.
Which of the statement(s) given above is/are correct?

A) Only 1 B) Only 2 C) Both 1 and 2 D) Neither 1 nor 2

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Answer & Solution

Answer: Option C

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