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306. Frequency modulation is preferred over amplitude modulation because
A. it improves the quality of signals.
B. it provides a method of transmission free from static interferences.
C. the amplitude of a carrier wave can be modulated.
D. it minimises the expenditure.
Explanation:
307. A corked bottle full of water when frozen will break because
A. glass is a bad conductor of heat
B. the bottle contracts on freezing.
C. the volume of water decteases on freezing.
D. the volume of water increases on freezing.
Explanation:
308. You are travelling in a car and a thunder storm suddenly takes place. What will be your first step ?
A. Get out of the car and lie flat in the field
B. Lie flat in the car
C. Go to a nearby woodpole and stick to it
D. Stand below a tree
Explanation:
309. The ink from the fountain pen spills out when the pen is carried inside an air borne plane, because
A. the atmospheric pressure at high altitude is less compared to that is at the sea level.
B. the atmospheric pressure at high altitude is more than what is at the sea level.
C. the atomspheric pressure is exactly the same as that at the sea level.
D. the atmospheric pressure keeps changing rapidly.
Explanation:
310. Which of the following is a conventional source of energy ?
A. Wind
B. Solar
C. Geothermal
D. Hydropower
Explanation:
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