999+ Physics Questions Answers Explanation MCQ

Q:

Electric current is measured by which instrument?

A) voltmeter	B) ammeter
C) barometer	D) sinometer

Answer & Explanation Answer: B) ammeter

Explanation:

Electric current is measured by the instrument called ammeter. As current in a circuit is measured in amperes, the instrument used is called as ammeter.

Electric_current_is_measured_by_which_instrument1555505098.jpg image

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Q:

If a barometric reading is falling, this usually indicates what

A) Increasing pressure	B) Decreasing pressure
C) No pressure	D) None

Answer & Explanation Answer: B) Decreasing pressure

Explanation:

A barometer is a tool that measures air pressure

A rising barometer indicates increasing air pressure, a falling barometer indicates decreasing air pressure.

In space, there is a nearly complete vacuum, so the air pressure is zero.

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Q:

The safest hammers are those with heads that are

A) cast steel and chiseled	B) alloy and drop-forged steel
C) welded and alloyed	D) chiseled and drop forged

Answer & Explanation Answer: B) alloy and drop-forged steel

Explanation:

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Q:

Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water

A) increases to a great extent	B) increases slightly
C) decreases slightly	D) decreases rapidly

Answer & Explanation Answer: C) decreases slightly

Explanation:

Evaporation causing cooling.Here the evaporation is less. Therefore cooling is less.

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Q:

A doppler effect occurs when a source of sound moves

A) away from you	B) towards you
C) Both A & B	D) None of the above

Answer & Explanation Answer: C) Both A & B

Explanation:

The Doppler effect or Doppler shift is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source.

a_doppler_effect_occurs_when_a_source_of_sound_moves1560770484.jpg image

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Q:

Radio waves sent out by a radio stations are reflected by

A) troposphere	B) stratosphere
C) mesosphere	D) ionosphere

Answer & Explanation Answer: D) ionosphere

Explanation:

This is a layer of atmosphere about 60 to 70 km above the earth and extends to about 400km. It contains ionised particles which can reflect radio waves making radio communication round the world possible.

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Q:

At what temperature do the Fahrenheit and celcius scales give the same reading?

A) 212 degrees	B) 32 degreees
C) -40 degreees	D) 0 degreees

Answer & Explanation Answer: C) -40 degreees

Explanation:

We want the temperature when F=C.

We know that, $F = C x \frac{9}{5} + 32$

So substituting C For F, we have C = $- 40^{o}$

Therefore, C = -40.

Thus when C = -40, we have C = F

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Q:

Fat can be seperated from milk in a cream seperator because of :

A) Cohesive Force	B) Gravitational Force
C) Centripetal Force	D) Centrifugal Force

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