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

Food in the pressure cooker is cooked faster, as

a) more steam is available at 100°C

b) the boiling point increases due to an increase in pressure

c) the boiling point decreases due to an increase in pressure

d) more pressure is available at 100°C

Discuss »

Answer: (b)

Question : 12 [NDA]

Consider the following statements : If the same note is played on a flute and a sitar, one can still distinguish between them because they differ in

  1. frequency
  2. intensity
  3. quality
Which of the statements given above is/are correct?

a) 2 and 3 only

b) 1 and only

c) 3 only

d) 2 only

Discuss »

Answer: (c)

Question : 13

Which of the following processes result in cooling ?

  1. Evaporation of liquid
  2. Compression of gas
  3. Shaking a liquid in a vessel
  4. Adiabatic expansion of a gas
Select the correct answer using the code given below :

a) 2 and 3

b) 1 and 4

c) 1 and 3

d) 3 and 4

Discuss »

Answer: (b)

  1. The process of a liquid changing into its vapour below its boiling point is called evaporation. In this process remaining water after evaporation loses heat and gets cooled.
  2. If a gas is compressed, work is done on it which results in heating of the system or an increase in temperature.
  3. On shaking a liquid in a vessel, the kinetic energy of liquid molecules increases and hence, the temperature of the system increases.

  4. In adiabatic process ΔQ = 0

    From the first law of thermodynamics,

    ΔQ = ΔU + ΔW

    We have ΔU + ΔW = 0

    If the gas expands adiabatically (DW→positive), DU will be negative, so internal energy and hence, the temperature of the system will decrease. Thus, the gas is cooled.

Thus option (b) is correct.

Question : 14

The splitting of white light into seven colours on passing through a glass prism is due to

a) interference

b) refraction

c) reflection

d) diffraction

Discuss »

Answer: (b)

Disperssion arises because of basic phenomenon refraction.

Question : 15

Match List - I with List - II:

List I List II
A. high pitch 1. Faint sound
B. low pitch 2. Loud sound
C. small amplitude 3. High frequency
D. large amplitude 4. Low frequency
Select the correct answer using the codes given below the lists:

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 – 3, B – 4, C – 1, D – 2

Discuss »

Answer: (b)

The faster the vibration of source, the higher is the frequency and the higher is the pitch.

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