light, heat, thermodynamics, wave motion, sound, optics & oscillations - Category wise Question and Answer Practice Test with Solutions

light, heat, thermodynamics, wave motion, sound, optics & oscillations PRACTICE TEST [16 - EXERCISES]

set 1

set 2

set 3

set 4

set 5

set 6

set 7

set 8

set 9

set 10

set 11

set 12

set 13

set 14

set 15

set 16

Question : 21

When the distance between the object and the plane mirror increases

a) the distance between the image and the plane mirror increases

b) the image remains same

c) the size of the image will become less than the size of the object

d) the distance between the image and the plane mirror decreases

Answer: (a)

Question : 22

When pressure on piece of ice is increases its melting point

a) increases

b) decreases

c) remains unchanged

d) first increases and then decreases

Answer: (a)

Question : 23 [IAS Prelim]

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)

Question : 24 [PCS (Mains) 2002]

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 : 25 [UPPCS (Pre) 1998]

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)

IMPORTANT general science mcq EXERCISES

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1640 light thermodynamics sound optics and oscillations based general science mcq set 2 question answer pdf
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