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 : 11 [BPSC (Pre) 2000]

Reading glasses are made from which type of lenses?

a) Plain

b) Convex

c) Concave

d) None of these

Answer: (b)

Question : 12

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

List I List II
A. Sound wave 1. Transverse
B. Lightwave 2. Longitudinal
C. The speed of sound in a perfectly rigid rod 3. zero
D. The speed of sound in a vacuum 4. Infinite
Choose the correct option from the codes given below :

a) A – 4, B – 1, C – 2, D – 3

b) A – 2, B – 1, C – 4, D – 3

c) A – 2, B – 3, C – 4, D – 1

d) A – 4, B – 3, C – 2, D – 1

Answer: (b)

Sound waves cannot travel in a vacuum, because sound waves are mechanical waves.

Question : 13 [PSC (Pre) 2018]

The concept of expanding universe is based on

a) Zeeman effect

b) Stark effect

c) Doppler effect

d) Raman effect

Answer: (c)

Question : 14 [UPPCS (Pre) 2006]

Expansion during heating

a) Increases the weight of the material

b) Decreases the density of the material

c) Occurs only in solid

d) Occurs at the same rate for all liquids and solids

Answer: (b)

Question : 15

Two pulses travel in mutually opposite directions in a string with a speed of 2.5 cm/s as shown in the figure. Initially the pulses are 10 cm apart. What will be the state of the string after two seconds

a)

physics sound mcq question answer 8 option c

b)

physics sound mcq question answer 8 option a

c)

physics sound mcq question answer 8 option d

d)

physics sound mcq question answer 8 option d

Answer: (a)

After 2 second, each wave travels a distance = 2.5 × 2 = 5 m and

So the shape in figure (a) is the correct one.

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