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1346. When light passes from air into glass it experiences change in :
A. frequency and wavelength
B. frequency and speed
C. wavelength and speed
D. frequency, wavelength and speed
Explanation:
1347. The hydrogenation of the vegetables oils takes place in the presence of finely divided
A. aluminium
B. charcoal
C. silica
D. nickel
Explanation:
1348. Water kept in an old ""surahi"" is less cold than the water in a new one. Why ?
A. The pores in the surahi help in evaporation of water
B. The pores in the old surahi become clogged and thus, the total surface area for evaporation is reduced
C. Old surahis become saturated with water and hence evaporation is not rapid
D. Because of none of the above
Explanation:
1349. Which of the following substance is a bad conductor of electricity but a good conductor of heat ?
A. Abestos
B. Celluloid
C. Purspecks
D. Mica
Explanation:
1350. In a barometer, mercury is preferred over water because :
A. mercury is a good conductor of heat
B. mercury shines and therefore its level can be read easily
C. mercury has high density and low vapour pressure
D. mercury is available in pure form
Explanation:
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