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1536. Who invented the laser ?
A. Sir Frank Whittle
B. Fred Morrisson
C. Charles H. Townes
D. Seymour Cray
Explanation:
1537. The phenomenon of mirage is due to :
A. increased absorption of light by air at higher temperature
B. change in refractive index of air with change in temperature
C. total internal reflection
D. decreased absorption of light by air at higher temperature
Explanation:
1538. A boat loaded with rocks floats in the middle of a swimming pool and a man in the boat throws rocks over board in water. The water level of the pool will :
A. rise
B. be lowered
C. remain unchanged
D. first rises then goes down
Explanation:
1539. Two men talk on moon :
A. they hear each other with lower requency
B. they hear each other with higher frequency
C. they can hear each other with the same frequency as on earth
D. they can not hear each other at all
Explanation:
1540. A rocket and a jet engine differ because : A. thier working principles are entirely different. B. a rocket uses only liquid fuels whereas a jet can use solid fuels as well.C. while a rocket carries its own oxygen supply a jet draws its air out of the atmosphere.D. a rocket can propel vehicles into outer space whereas a jet cannot.
A. B, C and D are correct
B. C and D are correct
C. A and B are correct
D. A, C and D are correct
Explanation:
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