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.Management Sciences
Category: Physics Mcqs
The current through a metallic conductor is due to the motion of _________________?
0
A. free electrons
B. protons
C. neutrons
D. still under controversy
The energy radiated is directly proportional to the fourth power of Kelvins temperature is________________?
A. Karl-Weins law
B. Rayleigh-Jeans law
C. Stephens law
D. Plancks
The penetrating power of X-rays depends on their______________?
A. applied voltage
B. frequency
C. source
D. all of the above
When velocity time graph is a straight line parallel to time axis then__________________?
A. acceleration is const
B. acceleration is variable
C. acceleration is zero
D. velocity is zero
The velocity of sound in air would become double than its velocity at 0°C at temperature ?
A. 313°C
B. 586°C
C. 819°C
D. 1172°C
Acceptor and donor impurities donate______________?
A. n-carriers only
B. p-carriers only
C. p-carriers and n-carriers respectively
D. n-carriers and p-carriers respectively
Pair production cannot take place in a vacuum as ________ is not conserved ?
A. Energy
B. Charge
C. Mass
D. MomentumB.
The performance of a refrigerator is described by________________?
A. efficiency
B. coefficient of performance
C. both A and B
D. not described
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