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80095301. The velocity of sound in moist air is more than in dry air because the moist air has
A
less density than dry airB
less pressure than dry airC
more pressure than dry airD
more density than dry airCorrect Answer: A. less density than dry air
80140302. Which one of the following instruments is used to study the dispersion of light?
A
MicroscopeB
TelescopeC
SpectrometerD
PhotometerCorrect Answer: C. Spectrometer
80021303. Clear nights are colder than cloudy nights because of
A
conductionB
condensationC
radiationD
insolationCorrect Answer: C. radiation
80076304. The instrument that measures and records the relative humidity of air is
A
HydrometerB
HygrometerC
LactometerD
BarometerCorrect Answer: B. Hygrometer
80035305. If the diameter of a capillary is doubled, then the rise of water in it will be
A
two timesB
halfC
four timesD
no changeCorrect Answer: B. half
80065306. The best conductor of heat among the following is
A
alcoholB
mercuryC
etherD
waterCorrect Answer: B. mercury
80025307. During washing of clothes, we use indigo due to its
A
better-cleaning actionB
proper pigmental compositionC
high glorious natureD
very low costCorrect Answer: B. proper pigmental composition
80084308. The plastic material commonly used for making gear wheels is
A
PolyestersB
NylonsC
BakelitD
PolystyreneCorrect Answer: B. Nylons
80112309. When a person walking in bright Sunlight enters a dark room. he is not able to see clearly for a little while because
A
the eye muscles cannot immediately adjust the focal length of the eye lens.B
the retina retains the bright images for sometime and becomes momentarily insensitive.C
the iris is unable to contract the pupil immediately.D
the iris is unable to dilate the pupil immediately.Correct Answer: D. the iris is unable to dilate the pupil immediately.
80027310. Energv is continuously created in the sun due to:
A
nuclear fusionB
nuclear fissionC
radioactivityD
artificial radioactivityCorrect Answer: A. nuclear fusion
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