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80051221. Nuclear reactors used to produce electricity is based on
A
nuclear fissionB
nuclear fusionC
cold fusionD
superconductivityCorrect Answer: A. nuclear fission
80082222. The metal used to make lightning conductors is
A
IronB
AluminiumC
CopperD
ZincCorrect Answer: C. Copper
80075223. The instrument for measuring the intensity of earthquakes is called
A
EdiographB
PantographC
ErgographD
SeismographCorrect Answer: D. Seismograph
80138224. Which of the following statements is true when we see 'rainbow'?
A
We face sun and raindropsB
The Sun remains behind us and we face raindropsC
In light rainfall, we face SunD
The sky remains clear and the sun is at a lower position in the skyCorrect Answer: B. The Sun remains behind us and we face raindrops
80142225. Which one of the following lenses should be used to correct the defect of astigmatism
A
Cylindrical lensB
Concave lensC
Convex lensD
Bifocal lensCorrect Answer: A. Cylindrical lens
80101226. What apparatus is used to locate a submerged object?
A
RadarB
SonarC
QuasarD
PulsarCorrect Answer: B. Sonar
80108227. What is viewed through an electron microscope?
A
Electrons and other elementary particlesB
Structure of bacteria and virusesC
Inside of human stomachD
Inside of the human eyeCorrect Answer: B. Structure of bacteria and viruses
80111228. When a bottle of scent is kept open in a corner of a room its odor is felt in all parts of the room. This is due to the phenomenon of :
A
evaporationB
vaporizationC
diffusionD
sublimationCorrect Answer: C. diffusion
80041229. In a refrigerator what producess the cooling?
A
The ice which deposits on the freezerB
The sudden expansion of compressed gasC
The evaporation of a volatile liquidD
None of theseCorrect Answer: D. None of these
80064230. The atmospheric layer reflecting radio waves is called
A
OzonosphereB
IonosphereC
StratosphereD
MesosphereCorrect Answer: B. Ionosphere
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