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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
(a) Water starts boiling at a higher temperature due to high pressure
(b) Water boils only at 100ºC but the heat content is higher at high pressure
(c) Water starts boiling at a lower temperature due to high pressure
(d) Convection currents are set inside the cooker
The correct answers to the above question in:
Answer: (a)
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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
Consider the figures of a metal ball and a metal ring given below. The metal ball can just pass through the hole of a metal ring formed out of a strip. When the ball is heated it gets stuck. But when the metal is heated
![Thermodynamics mcq question answer 24](https://careericons.com/adminicon/bunch/images/Thermodynamics-mcq-question-answer-24.png)
a) The ball gets stuck because of the diameter of the hole decrease on expansion
b) The ball will still pass through because the hole diameter does not change
c) The ball can still pass through the ring as diameter expands on heating
d) The ball will pass through because there is no change in the ring
Answer »Answer: (c)
Question : 2
Some common mediums in which the speed of sound waves is measured are mentioned below?
- Air
- Steel
- Copper
- Water
a) 1 < 4 < 3 < 2
b) 1 < 4 < 2 < 3
c) 4 < 1 < 2 < 3
d) 4 < 1 < 3 < 2
Answer »Answer: (a)
The speed of sound is maximum in solids
Vsolid > Vliquid > Vgas.
Steel is more elastic than copper, hence the speed of sound is greater in steel than in copper.
Question : 3
Optical fibre works on the principle of
a) Scattering
b) Refraction
c) Total internal reflection
d) Interference
Answer »Answer: (c)
Question : 4
At what point the Fahrenheit temperature is double of Centigrade temperature?
a) – 12.3°C
b) 12.3°C
c) – 6.7°C
d) 160°C
Answer »Answer: (d)
Question : 5
Smoke emerging from a campfire at the bottom of a hill is being observed by a person at some distance, as shown in the figure. It is evening and the sun has just set behind the hill. Consider regions I and II of the smoke going up the sky
![physics optics mcq question answer 29](https://careericons.com/adminicon/bunch/images/physics-optics-mcq-question-answer-29.png)
a) region I will be slightly brighter than the hill and region II will be slightly darker than the sky
b) region I will be slightly brighter than the hill and region II will be slightly brighter than the sky
c) region I will be slightly darker than the hill and region II will be slightly brighter than the sky
d) region I will be slightly darker than the hill and region II will be slightly darker than the sky
Answer »Answer: (a)
Question : 6
In a sitar wire which one of the following types of vibration is produced?
a) Stationary longitudinal
b) Progressive longitudinal
c) Progressive transverse
d) Stationary transverse
Answer »Answer: (d)
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