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]

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set 16

Question : 16

Consider the following statements :

  1. Some bodies may contract on heating.
  2. Water shows anomalous expansion.
Which of the statements given above is/ are correct?

a) 1 and 2 both

b) 2 only

c) 1 only

d) None

Answer: (a)

Some bodies like wood, rubber etc. have negative value of coefficient of thermal expansion, hence they contract on heating.

Hence 1 is true. 2 is also true.

Question : 17

Consider the following statements :

  1. The shock waves produced by a supersonic aircraft do not have much intensity.
  2. The speed of sound is maximum in solids.
  3. A bat emits ultrasonic waves.
  4. Sound waves of frequency below audible range are termed as ultrasonic.
Which of the statements given above is/ are correct?

a) 2 and 3

b) 1, 2 and 3

c) 1, 3, and 4

d) 1 and 4

Answer: (a)

A shock wave is a type of propagating disturbance. Like an ordinary wave, it carries energy and can propagate through a medium (solid, liquid, gas or plasma) or in some cases in the absence of a material medium. Across a shock wave there is always an extremely rapid rise in pressure, temperature and density of the flow.

Ultrasound is sound with a frequency greater than the upper limit of human hearing (greater than 20 kHz).

Question : 18 [PSC (Pre) 2018]

On adding common salt to water, the boiling point and freezing point of water will

a) Decrease

b) Decrease and increase respectively

c) Increase

d) Increase and decrease respectively

Answer: (d)

Question : 19

Consider the following three statements

  1. Heating 1 kg of water from 10°C to 50°C
  2. Melting 600 g of ice at 0°C
  3. Converting 300 g of ice at 0°C to water at 50°C
Which one of the following shows the correct arrangement of the quantity of heat required in the above process in increasing order of magnitude? Choose the correct answer from the codes give below

a) 2, 1, 3

b) 1, 2, 3

c) 3, 2, 1

d) 3, 1, 2

Answer: (d)

Question : 20 [UP (Spl)(Pre) 2008]

The cloudy nights are warmer than clear nights because

a) Clouds absorb Sunlight during the day and radiate the same in night

b) Clouds make the atmosphere damp and generate heat

c) The clouds prevent radiation of heat from the ground and the air

d) The clouds obstruct the movement of air which creates heat

Answer: (c)

IMPORTANT general science mcq EXERCISES

set 6 Online Quiz

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1644 light thermodynamics sound optics and oscillations based general science mcq set 6 question answer pdf
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