set 1 MCQ Questions & Answers Detailed Explanation

MOST IMPORTANT general science mcq - 16 EXERCISES

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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq

Questions : When vapour condenses into liquid

(a) its temperature rises

(b) it absorbs heat

(c) it liberates heat

(d) its temperature decreases

The correct answers to the above question in:

Answer: (c)

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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers

Question : 1

The turntable of a gramophone is rotated at a constant speed of x revolutions/minute. Which one of the following values of the revolutions per minute is not used ?

a) 56 r.p.m.

b) 78 r.p.m.

c) 45 r.p.m.

d) 33 r.p.m.

Answer: (a)

Question : 2

The heat required in calories to convert one gram of ice at 0°C to steam at 100°C is approximately

a) 336

b) 720

c) 80

d) 620

Answer: (b)

Question : 3

When a glass rod is placed in steam, its length increases but its width

a) Decreases

b) Increases

c) Remains unchanged

d) Becomes irregular

Answer: (b)

Question : 4

Cosmic rays

a) can be charged as well as uncharged

b) are uncharged particles

c) are charged particles

d) None of the above

Answer: (c)

Question : 5

A radar which detects the presence of an enemy aircraft uses

a) Sound waves

b) Radio waves

c) Light waves

d) Ultrasound waves

Answer: (b)

Question : 6

The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason ?

a) Since the surface of the lake is at the same temperature as the air, no heat is lost.

b) Ice is a bad conductor of heat.

c) The density of water is maximum at 4°C.

d) None of the statements (a), (b) and (c) given is correct.

Answer: (b)

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