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80132201. Which of the following is used to split white light into different colors?
A
Glass slabB
Convex lensC
Concave lensD
PrismCorrect Answer: D. Prism
80024202. Decibel is the unit used for
A
Speed of lightB
Intensity of heatC
Intensity of soundD
Radio wave frequencyCorrect Answer: C. Intensity of sound
80094203. The velocity of heat radiation in vacuum is
A
Equal to that of lightB
Less than that of lightC
Greater than that of lightD
Equal to that of soundCorrect Answer: A. Equal to that of light
80043204. In the atmosphere ultraviolet rays are absorbed by
A
OxygenB
NitrogenC
OvoneD
HeliumCorrect Answer: C. Ovone
80061205. Superconductors are those elements
A
Whose conductivity is intermediate between metals and insulatorsB
Whose resistance falls almost to zero at very low temperaturesC
which turn into insulators at very low temperaturesD
which conduct electricity only at super-high temperaturesCorrect Answer: B. Whose resistance falls almost to zero at very low temperatures
80000206. The splitting of different colors of light in a prism is
A
Reflection-of lightB
Disperson of lightC
Diffraction of lightD
Refraction of lightCorrect Answer: B. Disperson of light
80133207. Which of the following laws validates the statement that matter can neither be created nor destroyed ?
A
Law of conservation of energyB
Le Chatelier's PrincipleC
Law of conservation of massD
Law of osmosisCorrect Answer: C. Law of conservation of mass
80017208. An electrostatic precipitator is used to control the pollution of
A
airB
waterC
noiseD
thermalCorrect Answer: A. air
80032209. Heat from the Sun reaches the Earth by
A
ReflectionB
ConductionC
RadiationD
ConvectionCorrect Answer: C. Radiation
80151210. Wollen clothes keep the body warm because
A
Wool increases the temperature of the bodyB
Wool is a bad conductorC
Wool absorbs radiant heat from outer objectsD
Wool rejects heat from the outer objectsCorrect Answer: B. Wool is a bad conductor
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