Questions
31
What is the approximate mean velocity with which the earth moves round the sun in its orbit ?
Answer: Option [B]
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:
Answer: Option [D]
37
Which one of the following is printed on a commonly used fluorescent tube light ?
Answer: Option [C]
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 ?
Answer: Option [C]
39
The technique used to transmit audio signals in television broadcasts is:
Answer: Option [A]
40
For reproducing sound, a CD (compact disc) audio player uses a:
Answer: Option [B]
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