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11 Low temperature (cryogenics) find application in:
A space travel, magnetic levitation and telemetry
B space travel, surgery and telemetry
C surgery, magnetic levitation and telemetry
D space travel, surgery and magnetic levitation

Answer: Option [D]
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 ?
A Blue
B Yellow
C Orange
D Yellow-orange

Answer: Option [D]
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13 Total internal reflection can take place when light travels from
A air to glass
B air to water
C diamond to glass
D water to glass

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.

A I only
B II and III only
C I and III only
D None of the above produces the thunder

Answer: Option [D]
15 Fluorescent tubes are fitted with a choke. The choke coil:
A steps down the line voltage
B steps up the line voltage
C reduces current in the circuit
D chokes low frequency current

Answer: Option [C]
16 What is the order of magnitude of electric resistance of the human body (dry) ?
A 102 ohm
B 104 ohm
C 106 ohm
D 108 ohm

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 ?
A Weak nuclear force causes radioactivity
B Gravity is the strongest of the four
C Electromagnetism acts only on particles with an electric charge
D Strong nuclear force holds protons and neutrons inside the nucleus of an atom

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.
A III alone is correct
B I and II are correct
C I and III are correct
D I, II and III are correct

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:
A very high density
B very small size
C very large size
D very low size

Answer: Option [A]
20 In which one among the following is the speed of sound maximum ?
A Air 00C
B Air 1000C
C Water
D Wood

Answer: Option [D]

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