B. Colour of light 2. Refractive index of
the medium
C. Velocity of light 3. Amplitude of light
D. Propagation of light 4. Frequency of light
A B C D
(a) 2 4 1 3
(b) 3 4 2 1
(c) 3 1 2 4
(d) 4 2 3 1
Ans : (b)
156. A bubble of water shines because of: [IAS 1995]
(a) reflection
(b) refraction
(c) total internal reflection
(d) None of the above
Ans : (c)
157. One of the youngest sciences of the 20th century which deals with production, control and application of very low temperature
(approx. below - 150 °C) is called:
(a) Cryptography
(b) Crystallograhy
(c) Cryogenics
(d) Acarology
Ans : (c)
158. Which of the following is used in a diesel engine?
1) Cylinder
2) Sparkplug
3) Piston
(a) 1, 2 and 3
(b) 1 and 2
(c) 2 and 3
(d) 1 and 3
Ans : (d)
159. With which of the following instruments can a sailor in a submarine seethe objects on the surface of sea?
(a) Periscope
(b) Telescope
(c) Gyroscope
(d) Stereoscope
Ans : (a)
160. Match the following: [CDS 1991]
A. Petrol engine 1. Compression
B. Diesel engine 2. Sparkplug
C. Ship 3. Turboprop
D. Jet aircraft 4. Propeller
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