999+ Physics Questions Answers Explanation MCQ

Q:

The optical phenomenon that is primarily responsible for the observation of rainbow on a rainy day is

A) diffraction	B) interference
C) dispersion	D) reflection

Answer & Explanation Answer: C) dispersion

Explanation:

A rainbow is a natural spectrum appearing in the sky after a rain shower. It is caused by dispersion of sunlight by tiny water droplets, present in the atmosphere. A rainbow is always formed in a direction opposite to that of the Sun. The water droplets act like small prisms. They refract and disperse the incident sunlight, then reflect it internally, and finally refract it again when it comes out of the raindrops.

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Q:

The substances which reduce friction are called _________.

A) irregularities	B) lubricants
C) adhesives	D) viscous

Answer & Explanation Answer: B) lubricants

Explanation:

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Q:

The solubility of a gas in a liquid is

A) increased with increasing pressure	B) decreased with increasing temperature
C) Both A & B	D) None of the above

Answer & Explanation Answer: C) Both A & B

Explanation:

The solubility of a gas in a liquid is directly and inversely proportional to pressure and temperature respectively.

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Q:

Radiocarbon dating technique is used to estimate the age of

A) fossils	B) rocks
C) monuments	D) soil

Answer & Explanation Answer: A) fossils

Explanation:

Radiocarbon dating also referred to as carbon dating or carbon-14 dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon.

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Q:

Filament of electric bulb is made of _____.

A) Magnesium	B) Lead
C) Tin	D) Tungsten

Answer & Explanation Answer: D) Tungsten

Explanation:

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Q:

An image formed by a plane mirror, that cannot be obtained on a screen is called _______.

A) Virtual image	B) Real image
C) Inverted image	D) Erect image

Answer & Explanation Answer: A) Virtual image

Explanation:

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Q:

Rate at which velocity changes over time?

A) Speed	B) Displacement
C) Acceleration	D) Jerk

Answer & Explanation Answer: C) Acceleration

Explanation:

Acceleration is nothing but the rate at which velocity changes over time.

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Q:

An electric iron of 750 W is used for S hours per day. Then the energy consumed in one day by the iron is:

A) 6 units	B) 600 units
C) 0.6 units	D) 60 units

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