999+ Physics Questions Answers Explanation MCQ

Q:

Ball bearings are used in cycles, scooters etc to

A) Increase the friction between the wheel and the axle	B) Reduce the friction between the wheel and the axle
C) Reduce the friction between ground and the whee	D) None of the above

Answer & Explanation Answer: B) Reduce the friction between the wheel and the axle

Explanation:

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Q:

The working of the quartz crystal in the watch is based on the

A) Piezo - electric Effect	B) Edison Effect
C) Photoelectric Effect	D) Johnson Effect

Answer & Explanation Answer: A) Piezo - electric Effect

Explanation:

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Q:

Masses of stars and galaxies are usually expressed in terms of

A) neutron mass	B) earth's mass
C) solar mass	D) lunar mass

Answer & Explanation Answer: C) solar mass

Explanation:

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Q:

The core of an electromagnet is made of soft iron because soft iron has

A) small susceptibility and small retentivity	B) large susceptibility and small retentivity
C) large density and large retentivity	D) small density and large retentivity

Answer & Explanation Answer: B) large susceptibility and small retentivity

Explanation:

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Q:

Is B2+ Paramagnetic or Diamagnetic?

Answer

B2+ is a Paramagnetic.

The filled orbitals are $σ$ (1s) $^{2}$ , $σ^{*}$ (1s) $^{2}$ , $σ$ (2s) $^{2}$ , $σ^{*}$ (2s) $^{2}$ . The half-filled orbitals are $π$ (2p $_{x}$ ) and $π$ (2p $_{y}$ ). Since it posses 2 unpaired electrons, it is Paramagnetic in nature.

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Q:

The base of an electric iron is brightly polished mainly

A) to make it smooth and frictionless	B) to make it rust-proof
C) to reduce heat loss by radiation	D) to make it more durable

Answer & Explanation Answer: C) to reduce heat loss by radiation

Explanation:

Polished surfaces are poor radiators of heat. So loss of heat on that account is reduced and the electric iron remains hotter than otherwise.

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Q:

Reading of a barometer going down is an indication of

A) Storm	B) Rainfall
C) Snow	D) Intense heat

Answer & Explanation Answer: B) Rainfall

Explanation:

Barometer is instrument which is used to measure to pressure. A slow downfall of reading suggests a low pressure area is passing in a nearby region, it may rains. If the reading is going down very fast then its an indication of storm (within 5-6 hours).

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Q:

Which of the following physical quantities do not have same dimensions

A) Force and Pressure	B) Work and Energy
C) Impulse and momentum	D) Weight and Force

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