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 : 26

What temperature is the same on celsius scale as well as on Fahrenheit scale?

a) – 32°C

b) – 212°C

c) – 40°C

d) 32°C

Answer: (c)

$C/5 = {F - 32}/9$ Here C = F

$C/5 = {F - 32}/9$ ⇒ 9C = 5C – 160

4C = – 160 ⇒ C = – 40°C.

Thus at –40°C and –40° F the temperture is same.

Question : 27 [BPSC (Pre) 2005]

Cooling is done by

a) Release of compressed gas

b) Cooking gas

c) Flow of water

d) Melting the solid

Answer: (a)

Question : 28 [UPPCS (Spl)(Mains) 2004]

The image formed on Retina is

a) Smaller than object but inverted

b) Smaller than object but straight

c) Equal to object but inverted

d) Equal to object but straight

Answer: (a)

Question : 29 [PSC (Pre) 2018]

The terminal colour bands of the rainbow are

a) Yellow and Green

b) Green and Red

c) Blue and Orange

d) Violet and Red

Answer: (d)

Question : 30

Match list I with list II and select the correct answer using the codes given below the lists.

List I List II
A. Direct conversion of vapours into solid 1. Sublimation
B. Direct conversion of a solid into vapours 2. Hoar frost
C. The phase change from liquid to vapour 3. Condensation
D. The phase change from vapour to liquid 4. Vaporisation
Choose the correct option from the codes given below :

a) A – 3, B – 1, C – 2, D – 4

b) A – 2, B – 3, C – 4, D – 1

c) A – 2, B – 1, C – 4, D – 3

d) A – 3, B – 4, C – 1, D – 2

Answer: (c)

Hoar frost is an example of the direct conversion of vapour into solid.

Sublimation is the process of the conversion of solids to a gaseous state.

Condensation is the process of conversion of gases to a liquid state on cooling.

Evaporation is the process of conversion of liquid into a gaseous state.

IMPORTANT general science mcq EXERCISES

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