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# CSAT Prelims Physics - General Knowledge Questions and Answers for UPSC Exam | Page-4

Questions
31 What is the approximate mean velocity with which the earth moves round the sun in its orbit ?
A 20 km/s
B 30 km/s
C 40 km/s
D 50 km/s

32 When water is heated from 00C to 100C. Its volume:
A increases
B decreases
C does not change
D first decreases and then increases

33 A noise level of 100 decibel would correspond to:
A just audible sound
B ordinary conversation
C noise from a machine shop
D sound from a noisy street

34 Consider the following statements:
I. Light of longer wavelength are scattered much more than the light of shorter wavelength.
II. The speed of visible light in water is 0.95 times the speed in vacuum
III. Radio waves are produced by rapidly oscillating electrical currents.
IV. To detect the over speeding vehicles, police use the Doppler effect of reflected short radio waves.

Which of these statements are correct:

A I and II
B I and III
C II and IV
D III and IV

35 Diffusion of light in the atmosphere takes place due to:
A helium
B dust particles
C water vapours
D carbon dioxide

36 Domestic electrical wiring is basically a:
A parallel connection
B series connection
C combination of series and parallel connections
D series connection within each room and parallel connection elsewhere

37 Which one of the following is printed on a commonly used fluorescent tube light ?
A 220 k
B 273 k
C 6500 k
D 7500 k

38 Grapheme is frequency in news recently. What is its importance ?
I. It is a two-dimensional material and has good electrical conductivity.
II. It is one of the thinnest but strongest materials tested so far.
III. It is entirely made of silicon and has high optical transparency.
IV. It can be used as ‘conducting electrodes’ required for touch screens, LCDs and organic LEDs.

Which of the statements given above are correct ?

A I and II only
B III and IV only
C I, II and IV only
D I, II, III and IV

39 The technique used to transmit audio signals in television broadcasts is:
A Frequency modulation
B Amplitude modulation
C Time division modulation
D Pulse code modulation

40 For reproducing sound, a CD (compact disc) audio player uses a:
A titanium needle
B laser beam
C quartz crystal
D barium titanate ceramic