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 [IAS (Pre) 1995]

The normal temperature of human body on the Kelvin scale is

a) 290

b) 300

c) 280

d) 310

Answer: (d)

Question : 12 [IAS Prelim]

Assertion (A) :
A jet aircraft moving at Mach Number equal to 1 travels faster at an altitude of 15 km than while moving at Mach Number equal to 1 near the sea level.
Reason (R) :
The velocity of sound depends on the temperature of the surrounding medium.

a) Both A and R are true but R is not a correct explanation of A

b) Both A are R are true and R is the correct explanation of A

c) A is true but R is false

d) A is false but R is true

Answer: (d)

Question : 13

In scattering of light phenomenon, light falls on tiny particles absorbed by these tiny particles. Then these particles re-emit light in all directions.

  1. Intensity of scattered light, $I ∝ 1/λ^4$
  2. Greenish-blue appearance of sea water is due to scattering of light
  3. In a clear atmosphere of the earth, red colour scatters more than blue colour.
Which of the above statement(s) is /are true?

a) 1 and 3

b) 1 and 2

c) 2 and 3

d) 1, 2 and 3

Answer: (d)

The wavelength of the red colour is more than the blue colour. According to Reybergh's scattering formula scattering ∝ $1/4$

Thus, the light of short waves is scattered about ten times as the longer waves of red light.

Question : 14 [UPPCS (Mains) 2007]

The technique used to transmit auto signals in television broadcasts is

a) Pulse Code Modulation

b) Frequency Modulation

c) Amplitude Modulation

d) Time Division Multiplexing

Answer: (b)

Question : 15 [BPSC (Pre) 1995]

In the night wind blows fast, dew is not formed because

a) Moisture in air is low

b) Temperature is high

c) Rate of evaporation is fast

d) Sky is not clear

Answer: (c)

IMPORTANT general science mcq EXERCISES

set 15 Online Quiz

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1653 heat wave motion sound optics oscillations based general science mcq set 15 question answer pdf
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