286. What is the voltage of the electricity used for domestic
purpose?
(a) 460 (b) 110
(c) 230 (d) 275
Answer: (c)
287. The study of sound:
(a) Accoustics (b) Optics
(c) Otology (d) None of these
Answer: (a)
288. The device used to measure the depth of oceans using sound
waves:
(a) Radar (b) Sonometer
(c) Sonar (d) Vernier
Answer: (c)
289. In which one of the following medium, sound has
maximum
speed?
(a) Vaccum (b) Air
(c) Wood (d) Iron
Answer: (d)
290. The speed of sound in water is .....metre per second:
(a) 340 (b) 1435
(c) 3850 (d) 5000
Answer: (b)
291. The energy source related to oceans:
(a) Solar Panel (b) Wind Energy Farm
(c) Geothermal Energy (d) Wave Energy
Answer: (d)
292. The mirror used in the headlight of automobiles:
(a) Cylindrical (b) Plain
(c) Concave (d) Convex
Answer: (c)
293. What type of mirror is used in the rear view mirror
of
automobiles:
(a) Convex (b) Concave
(c) Cylindrical (d) None of these
Answer: (a)
294. Which ray has negative charge?
(a) Alpha (b) Beta
(c) Gama (d) X-ray
Answer: (b)
295. What will be the colour of sky if there is no atmosphere?
(a) White (b) Blue
(c) Black (d) Green
Answer: (c)
296. The phenomenon responsible for the blue colour of sky:
(a) Disperson (b) Diffraction
(c) Reflection (d) Diffusion
Answer: (a)
297. The temperature at which molecular action stops completely:
(a) Minus 373 degree C (b) Minus 273 degree C
(c) Zero 373 degree C (d) 1000 degree C
Answer: (b)
298. Three primary colours of television are:
(a) Red, Green, Blue (b) Red ,yellow, Blue
(c) Red, Yellow, Green
(d) Green, Blue, Yellow
Answer: (a)
299. The colour of universe:
(a) Black (b) White
(c) Red (d) Blue
Answer: (a)
300. The rays used in the remote control of TV:
(a) UV Rays (b) Infra Red rays
(c) X rays (d) Gama rays
Answer: (b)
301. India launched its first artificial satellite on April 19, 1975
from Kapustinyar in:
(a) Kazakhstan (b) Russia
(c) Ukraine (d) Uzbekistan
Answer: (b)
302. The colour of Black box in aeroplanes:
(a) Red (b) Orange
(c) Green (d) Blue
Answer: (b)
303. The first satellite launched by USA in 1958:
(a) Sputnik (b) Skylab
(c) Explorer-I (d) Challenger –I
Answer: (c)
304. Gravitational force is minimum in:
(a) Poles (b) Equator
(c) Temperate region (d) None of these
Answer: (b)
305. The process of convertion of one element into another:
(a) Reduction (b) Oxidation
(c) Transmutation (d) Migration
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