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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
(a) Steel > Water > Wood
(b) Steel > Wood > Water
(c) Water > Steel > Wood
(d) Water > Wood > Steel
The correct answers to the above question in:
Answer: (a)
Practice light, heat, thermodynamics, wave motion, sound, optics & oscillations (set 10) Online Quiz
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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
Thermostat is related to
a) Temperature
b) Air
c) Humidity
d) Clouds
Answer »Answer: (a)
Question : 2
Which of the following is a mechanical wave?
a) Light waves
b) X-rays
c) Radio waves
d) Sound waves
Answer »Answer: (d)
Question : 3
Consider the following statements.
Assertion (A):
Light coloured clothes are preferred in summer.
Reason (R):
Light colours are poor absorbers of heat.
Select correct answer from the code given below.
a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
b) (A) is true, but (R) is false
c) Both (A) and (R) are true and (R) is the correct explanation of (A)
d) (A) is false, but (R) is true
Answer »Answer: (c)
Question : 4
Consider the following statements:
- The sun looks red at sunset because most of the blue light in sunrays is scattered leaving behind red and yellow lights.
- Clouds look white because water droplets of clouds scatter all colours of light equally.
a) 1 and 2 both
b) 1 only
c) 2 only
d) None
Answer »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 : 5
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 »Answer: (d)
Triple point is the temperature where three states of matter can exist simultaneously.
Question : 6
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
Answer »Answer: (a)
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