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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
(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.
The correct answers to the above question in:
Answer: (d)
Triple point is the temperature where three states of matter can exist simultaneously.
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
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 : 2
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 »Answer: (a)
Question : 3
Thermostat is related to
a) Temperature
b) Air
c) Humidity
d) Clouds
Answer »Answer: (a)
Question : 4
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)
Question : 5
Put in ascending order the speed of sound in the mediums.
- Water
- Steel
- Nitrogen
a) 3, 1, 2
b) 1, 3, 2
c) 3, 2, 1
d) 2, 1, 3
Answer »Answer: (a)
Question : 6
The velocity of sound is maximum in
a) Liquid
b) Metal
c) Air
d) Vacuum
Answer »Answer: (b)
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