set 6 MCQ Questions & Answers Detailed Explanation

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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq

Questions : 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

The correct answers to the above question in:

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).

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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers

Question : 1

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 : 2

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 : 3

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)

Question : 4

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 : 5

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

Answer: (b)

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

Question : 6

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

Answer: (b)

Disperssion arises because of basic phenomenon refraction.

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