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 [PCS (Pre) 2004]

Sound waves

a) can travel only in solid

b) can travel only in gases

c) can travel in vacuum

d) can travel both in solid and gaseous medium

Answer: (d)

Question : 22 [UPPCS (Mains) 2015]

A cut diamond shines brilliantly due to

a) Some inherent property

b) Absorption of light

c) Total internal reflection

d) Its molecular structure

Answer: (c)

Question : 23 [MPPCS (Pre) 2017]

The power of a lens is measured in

a) Lumen

b) Aeon

c) Dioptre

d) Candela

Answer: (c)

Question : 24

A solid cube and a solid sphere of the same material have equal surface area. Both are at the same temperture 120°C , then

a) the sphere cools down faster than the cube

b) both the cube and the sphere cool down at the same rate

c) the cube cools down faster than the sphere

d) whichever is having more mass will cool down faster

Answer: (c)

Rate of cooling of a body R = ${Δϴ}/t = {Aɛσ(T^4 - {T_O}^4)}/{mc}$

⇒ $R ∝ A/m ∝ \text"Area"/\text"Volume"[m = ρ×V]$

⇒ For the same surface area. $R ∝ 1/\text"Volume"$

Since Volume of cube < Volume of a sphere

⇒ $R_{cube} > R_{Sphere}$

i.e., the cube cools down at a faster rate.

Question : 25

At a given temperature the internal energy of a substance

a) in liquid state is more than that in gaseous state

b) in liquid state is equal to that in gaseous state

c) in liquid state is less than that in gaseous state

d) is equal for the three states of matter

Answer: (c)

IMPORTANT general science mcq EXERCISES

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