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

Consider the following natural phenomena:

  1. Terrestrial heating
  2. Reflection of light
  3. Refraction of light
  4. Diffraction of light
Due to which of these phenomena is a mirage formed ?

a) 1 and 3

b) 1 and 2

c) 2, 3 and 4

d) 4 only

Answer: (a)

Convection currents of hot air rising off a surface have a lower density than the air directly above it.

The difference in density cause light passing through the air to refract differently, which causes the formation of mirage.

Question : 27

Which of the following statements is/ are true?

  1. Absolute zero temperature is zero energy temperature.
  2. Two different gases at the same temperature pressure have equal root mean square velocities.
  3. The root mean square speed of the molecules of different ideal gases, maintained at the same temperature are the same.
  4. Given sample of 1cc of hydrogen and 1 cc of oxygen both at NTP; oxygen sample has a large number of molecules.

a) 1, 3 and 4

b) 2 and 3

c) 1 only

d) 2, 3 and 4

Answer: (c)

∈ = 3 2 RT;

T = 0,

∈ = 0

Question : 28 [IAS (Pre) 2009]

Which one among the following has the highest energy?

a) Red light

b) Green light

c) Blue light

d) Yellow light

Answer: (c)

Question : 29 [PSC (Pre) 2019]

Consider the following statements.

  1. A flute of smaller length produces waves of lower frequency.
  2. Sound travels in rocks in the form of longitudinal elastic waves only.
Which of the statements given above is/are correct?

a) Only 2

b) Both 1 and 2

c) Only 1

d) Neither 1 nor 2

Answer: (a)

Question : 30

Heat is transmitted from higher to lower temperature through actual mass motion of the molecules in

a) radiation

b) conduction

c) convection

d) none of these

Answer: (c)

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