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

Questions : Cloudy nights are warmer compared to clear cloudless nights, because clouds

(a) Reflect back the heat given off by Earth

(b) Produce heat and radiate it towards Earth

(c) Prevent cold waves from the sky from descending on Earth

(d) Absorb heat from the atmosphere and send it toward Earth

The correct answers to the above question in:

Answer: (a)

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Question : 1

Triple point is the temperature at which

a) matter may simultaneously exist in solid and gaseous state.

b) matter may simultaneously exist in liquid and gaseous state.

c) matter may simultaneously exist in liquid and solid state.

d) matter may simultaneously exist in all the three forms.

Answer: (d)

Triple point is the temperature where three states of matter can exist simultaneously.

Question : 2

Consider the following statements:

  1. The sun looks red at sunset because most of the blue light in sunrays is scattered leaving behind red and yellow lights.
  2. Clouds look white because water droplets of clouds scatter all colours of light equally.
Which of these statements is/ are correct?

a) 1 and 2 both

b) 1 only

c) 2 only

d) None

Answer: (a)

According to the Raleigh scattering formula Scattering α$1/{λ^4}$

Short waves (violet) are scattered about ten times as the longer waves of red light. At sunrise and seen set, the sun’s rays have to pass through a larger distance in the atmosphere. Most of the blue and other shorter wavelengths are removed by scattering.

The least scattered light reaches our eye, therefore the sun looks reddish. Water droplets of clouds scatter all colours of light, thus object (cloud) appears white because all the colours recompose to give white light.

Question : 3

Which one among the following statements about thermal conductivity is correct ?

a) Steel > Water > Wood

b) Steel > Wood > Water

c) Water > Steel > Wood

d) Water > Wood > Steel

Answer: (a)

Question : 4

Put in ascending order the speed of sound in the mediums.

  1. Water
  2. Steel
  3. Nitrogen

a) 3, 1, 2

b) 1, 3, 2

c) 3, 2, 1

d) 2, 1, 3

Answer: (a)

Question : 5

The velocity of sound is maximum in

a) Liquid

b) Metal

c) Air

d) Vacuum

Answer: (b)

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