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80063291. The atmosphere is heated mainly by
A
InsolationB
ConductionC
RadiationD
ConvectionCorrect Answer: C. Radiation
80135292. Which of the following pairs of physical quantities have the same dimensions?
A
Force and PowerB
Work and PowerC
Work and EnergyD
Momentum and PowerCorrect Answer: C. Work and Energy
80093293. The type of mirrors used in the headlamp of cars is
A
parabolic concaveB
planeC
spherical convexD
cylindrical concaveCorrect Answer: A. parabolic concave
80097294. Tungsten is used for the manufacture of the filament of an electric bulb, because
A
It is a good conductorB
It is economicalC
It is malleableD
It has a very high melting pointCorrect Answer: D. It has a very high melting point
80014295. A pycnometer is an instrument used to measure the
A
densityB
intensity of solar radiationC
intensity of earthquakeD
high temperaturesCorrect Answer: A. density
80026296. Dynamo is a device for converting
A
Heat energy into electrical energyB
Mechanical energy into electrical energyC
Magnetic energy into electrical energyD
Chemical energy into electrical energyCorrect Answer: B. Mechanical energy into electrical energy
80129297. Which of the following is most elastic?
A
RubberB
Wet clayC
SteelD
PlasticCorrect Answer: C. Steel
80079298. The instrument which uses sound waves to measure the depth of oceans is
A
RadarB
SonarC
AltimeterD
VenturimeterCorrect Answer: B. Sonar
80011299. A passenger standing in a bus is thrown outward when the bus takes a sudden turn. This happens clue to
A
Outward pull on himB
Inertia of motionC
Change in momentumD
Change in accelerationCorrect Answer: B. Inertia of motion
80113300. When a ring of metal is heated what happens to its hole?
A
expandsB
contractsC
it expands or contracts according to its diameterD
it expands or contracts according to its coefficient of expansionCorrect Answer: A. expands
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