Physics questions and answers For UPSC | SSC | Rail | RRB | State PSC P28

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Page 28

80039271. In a Laser (say neon laser) all the atoms emit the light waves of

A

Same frequency

B

Same amplitude

C

Same phase

D

All of the above

D

Correct Answer: D. All of the above

80033272. Holography is a technique of

A

recording a permanent, sharp two-dimensional black and white or multicolor photograph

B

recording a permanent three-dimensional multicolor photograph

C

recording a permanent three-dimensional black and white photograph

D

recording a permanent three-dimensional photograph of a given single color or a multicolor

D

Correct Answer: D. recording a permanent three-dimensional photograph of a given single color or a multicolor

80018273. An ice block with a piece of lead embedded in it floats in water, if the ice melts the water level

A

Rises

B

Falls

C

Remains same

D

Falls first and then rues

B

Correct Answer: B. Falls

80120274. Which among the following is the fundamental quantity?

A

Volume

B

time

C

Velocity

D

Force

B

Correct Answer: B. time

80131275. Which of the following is used in the oven?

A

X-rays

B

UV rays

C

Microwaves

D

Radiowaves

C

Correct Answer: C. Microwaves

80034276. How many calories of energy are released by a boiled egg?

A

40

B

50

C

60

D

77

D

Correct Answer: D. 77

80056277. Raindrops fall from a great height. Which among the following statements is true regarding it?

A

they fall with that ultimate velocity, which is different for different droplets

B

they fall with the same ultimate velocity

C

their velocity increases and they fall with different velocity on the earth

D

their velocity increases and they fall with the same velocity on the earth

A

Correct Answer: A. they fall with that ultimate velocity, which is different for different droplets

80006278. A fountain pen works on the principle of

A

flow of liquids from higher to lower potential

B

capillary action

C

Bernoulli's principle

D

Viscosity of liquids

B

Correct Answer: B. capillary action

80127279. Which of the following instruments is used to measure humidity?

A

Kata Thermometer

B

Anemometer

C

Sling Psychrometer

D

Clinical Thermometer

C

Correct Answer: C. Sling Psychrometer

80110280. When a barometer reading suddenly recedes, it indicates that climate

A

will be very warm

B

will be extremely stormy

C

will remain cold

D

incessant rain for at least 48 hours

B

Correct Answer: B. will be extremely stormy

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