Questions
12
Suppose a rocketship is receding from the earth at a speed of 2/10 th the velocity of light. A light in the rocketship appears blue to the passengers on the ship. What colour would it appear to an observer on the earth ?
Answer: Option [D]
13
Total internal reflection can take place when light travels from
Answer: Option [C]
14
During a thunderstorm, the thunder in the skies is produced by the
I. meeting of cumulonimbus clouds in the sky
II. lightning that separates the nimbus clouds
III. violent upward movement of air and water particles
Select the correct answer using the codes given below.
Answer: Option [D]
15
Fluorescent tubes are fitted with a choke. The choke coil:
Answer: Option [C]
16
What is the order of magnitude of electric resistance of the human body (dry) ?
Answer: Option [B]
17
The known forces of nature can be divided into four classes, viz., gravity, electromagnetism, weak nuclear force and strong nuclear force. With reference to them, which one of the following statements is not correct ?
Answer: Option [B]
18
Consider the following statements : A person in a spaceship located half way between the earth and the sun will notice that the:
I. sky is jet black.
II. stars do not twinkle.
III. temperature outside the spaceship is much higher than that on the surface of the earth.
Answer: Option [D]
19
A ‘black hole’ is a body in space which does not allow any radiation to come out. This property is due to its:
Answer: Option [A]
20
In which one among the following is the speed of sound maximum ?
Answer: Option [D]
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