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General Science - Questions and Answers

Practice questions on General Science.

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171. A magnified and virtual image of an object can be obtained using a
A. Plane mirror
B. Concave mirror
C. Convex mirror
D. Concave lens
Explanation:
172. Transistor was invented by
A. Baird
B. Marconi
C. Shockley
D. Graham Bell
Explanation:
173. A steel ball floats on mercury because
A. mercury is also a metal in the liquid form.
B. the density of mercury is higher than that of steel.
C. mercury does not allow any metal to sink in it.
D. a steel ball can be made to float on any liquid by suitable adjustment.
Explanation:
174. The sun rays falling on a thin film of oil spread over a water surface breaks into different colours. This is due to
A. interference
B. diffraction
C. refraction
D. polatrisation
Explanation:
175. Electromagnetic induction is used in
A. Galvanometer
B. Thermocouple
C. Generators
D. None of these
Explanation:
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