999+ Physics Questions Answers Explanation MCQ

Q:

A transformer can do all of the following except

A) step-up a/c voltage	B) step-up a/c current
C) step-up a/c power	D) step-down a/c voltage

Answer & Explanation Answer: C) step-up a/c power

Explanation:

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Q:

What is the process of conversion of solid state directly to gaseous state called?

A) Evaporation	B) Condensation
C) Sublimation	D) Distillation

Answer & Explanation Answer: C) Sublimation

Explanation:

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Q:

Which term is not associated with sound wave?

A) Hertz	B) Decibel
C) Candela	D) Mach

Answer & Explanation Answer: C) Candela

Explanation:

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Q:

At what distance from the earth is gravity zero

Answer

Gravitational force is the force that binds everything at the surface of the earth. It holds at what distance from the earth is gravity zero.

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Q:

The energy that generates wind comes from what source?

A) Anemometers	B) Solar radiation
C) Ocean currents	D) None of the above

Answer & Explanation Answer: B) Solar radiation

Explanation:

Wind is nothing but the form of moving air. It is caused by the uneven heating of the earth's surface by the sun. Hence, the energy that generates wind comes from solar radiation.

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Q:

In a sound wave compressions are regions where density _________________________

A) as well as pressure is high	B) as well as pressure is low
C) is high and pressure is low	D) is low and pressure is high

Answer & Explanation Answer: A) as well as pressure is high

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Q:

A tank filled partially with a liquid is subjected to a uniform horizontal acceleration. Which of the following is true for the surface of liquid in the tank?

A) The liquid surface falls down on the direction of motion and rises up on the back side of the tank	B) The liquid surface falls down only at the center of the tank
C) The surface of the liquid remains horizontal	D) None

Answer & Explanation Answer: A) The liquid surface falls down on the direction of motion and rises up on the back side of the tank

Explanation:

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Q:

An object of 10 kg is moving with a speed of 2 m/s. The kinetic energy of the object is

A) 20 J	B) 25 J
C) 10 J	D) 40 J

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