999+ Physics Questions Answers Explanation MCQ

Q:

A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the the bucket. The reading of the spring balance

A) will increase	B) will decrease
C) does not change	D) varies with the increase of depth of the immersion of the iron piece

Answer & Explanation Answer: A) will increase

Explanation:

When the piece of iron is lowered into the water, the water level in the bucket increases. And so the pressure at the bottom of bucket also increases. Thus the total thrust at bottom also increases. Therefore the spring balance reading increases. Thus (a) is correct.

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Q:

A hunter on the ground wishes to shoot a bird on a tree at a distance with his rifle. He has to point the rifle

A) at the lower alevation than the bird	B) at a higher alevation than the bird
C) In the same direction as the bird	D) vertically upwards

Answer & Explanation Answer: B) at a higher alevation than the bird

Explanation:

The trajectory of the bullet is a parabola

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Q:

A series of fast moving still pictures can be made to appear as a moving picture because the eye

A) can focus very rapidly as pictures change	B) is quicker than the brain
C) can see 2 images separated only if the interval betwen seeing them is more than one-tenth of a second	D) can shut out some of the light

Answer & Explanation Answer: C) can see 2 images separated only if the interval betwen seeing them is more than one-tenth of a second

Explanation:

The eye can see images separately only if they are exhibited at an interval of more than 1/10 of a second. In the case of a movie, the still pictures come one after the other at less than this minimum interval. So we do not see them separately but only as a continuous moving picture.

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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

Answer & Explanation Answer: D) Centrifugal Force

Explanation:

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Q:

A manometer is used to measure

A) earthquake	B) pressure
C) temperature	D) density

Answer & Explanation Answer: B) pressure

Explanation:

A manometer is used to measure a pressure difference between two points.

a_manometer_is_used_to_measure1553165853.png image

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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:

Which of the following is an example of continous emission spectrum?

A) Spectrum of an oil frame	B) Spectrum of a water
C) both	D) none

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