CSAT Prelims Physics - General Knowledge Questions and Answers for UPSC Exam | Page-2

11 Low temperature (cryogenics) find application in:

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 ?

13 Total internal reflection can take place when light travels from

14 During a thunderstorm, the thunder in the skies is produced by the

15 Fluorescent tubes are fitted with a choke. The choke coil:

16 What is the order of magnitude of electric resistance of the human body (dry) ?

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 ?

18 Consider the following statements : A person in a spaceship located half way between the earth and the sun will notice that the:

19 A ‘black hole’ is a body in space which does not allow any radiation to come out. This property is due to its:

20 In which one among the following is the speed of sound maximum ?