GK - Physics
46.
When a bullet is fired from a gun
Answer
Newton's third law is: For every action, there is an equal and opposite reaction.
Answer :
Option DExplanation :
Newton's third law is: For every action, there is an equal and opposite reaction.
47.
Which part of the flame is the hottest?
Answer
The hottest part of the candle flame is the blue part, at 1670 degrees F (1400 C). That is where the flame has the most oxygen and you are getting complete combustion. The reddish part is the coolest part, about 1070 F (800 C).
Answer :
Option AExplanation :
The hottest part of the candle flame is the blue part, at 1670 degrees F (1400 C). That is where the flame has the most oxygen and you are getting complete combustion. The reddish part is the coolest part, about 1070 F (800 C).
48.
Optical fibre works on the
Answer
An optical fiber is a cylindrical dielectric waveguide (nonconducting waveguide) that transmits light along its axis, by the process of total internal reflection.
Answer :
Option BExplanation :
An optical fiber is a cylindrical dielectric waveguide (nonconducting waveguide) that transmits light along its axis, by the process of total internal reflection.
49.
In nuclear reactor, heavy water is used as
Answer
Heavy water is basically used as a moderator in nuclear reactors to slow down the neutrons so that they are captured and become effective to bring about the fission reaction. The main reason why heavy water is used as a moderator is because it captures less neutrons than the normal water.
Answer :
Option CExplanation :
Heavy water is basically used as a moderator in nuclear reactors to slow down the neutrons so that they are captured and become effective to bring about the fission reaction. The main reason why heavy water is used as a moderator is because it captures less neutrons than the normal water.
50.
Steam at 100°C causes more severe burns than water at 100°C because
Answer
Steam will produce more severe burns than boiling water because steam has more heat energy than water due to its latent heat of vaporisation.
Answer :
Option BExplanation :
Steam will produce more severe burns than boiling water because steam has more heat energy than water due to its latent heat of vaporisation.
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