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80016181. An electron microscope gives higher magnification than an optical microscope, because:
A
it uses more powerful lensesB
the velocity of the electron is smaller than that of visible lightC
the electrons have more energy than the light particlesD
the wavelength of electrons is smaller as compared to the wavelength of visible lightCorrect Answer: D. the wavelength of electrons is smaller as compared to the wavelength of visible light
80119182. Where are mesons found?
A
Cosmic raysB
X-raysC
Gamma raysD
Laser beamCorrect Answer: A. Cosmic rays
80070183. The energy emitted by the Sun is due to
A
Chemical reactionB
Nuclear fissionC
Nuclear fusionD
All of the aboveCorrect Answer: C. Nuclear fusion
80144184. While catching a ball, a player pulls down his hands to lower the
A
forceB
momentumC
impulseD
catching timeCorrect Answer: B. momentum
80068185. The dimension of which of the following is the same as that of impulse?
A
VolumeB
MomentumC
TorqueD
Change in the rate of momentumCorrect Answer: B. Momentum
80052186. Oil rises up the wick in a lamp because
A
Oil is very lightB
Of the diffusion of oil through the wickC
Of the surface tension phenomciionD
Of the capillary action phenonienonCorrect Answer: D. Of the capillary action phenonienon
80048187. Magnetism in materials is due to
A
electrons at restB
circular motion of electronsC
protons at restD
all neutrons at restCorrect Answer: B. circular motion of electrons
80042188. In electronics what comes under the tank circuit?
A
Resistance and capacityB
Resistance and inductanceC
Capacity and inductanceD
Resistance, capacity and inductanceCorrect Answer: C. Capacity and inductance
80002189. \'Short-sight' in the human eye can be corrected by using proper
A
convex lensB
concave lensC
cylindrical lensD
bifocal lensCorrect Answer: B. concave lens
80122190. Which among the following waves is used for communication by artificial satellites?
A
MicrowavesB
Radio wavesC
A.M.D
Frequency of 1016 seriesCorrect Answer: A. Microwaves
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