Physics MCQS with Answers
A planet is observed by an astronomical refracting telescope having an objective of focal length 16 m and an eyepiece of focal length 2 cm.
The image of the planet is inverted
The angular magnification of the planet is 200
The distance between the objective and the eyepiece is 8 m
The objective is smaller than the eyepiece
Which of the following is the only vector quantity?
Momentum
Power
Energy
Temperature
When we apply reverse bias to a junction diode, it
Lowers the potential barrier
Raise the potential barrier
Increase the majority carrier current
Increase the minority carrier current
A man pushes a wall but fails to displace it. He does:
Negative work
No work
Positive work but not maximum
Maximum positive work
To get a resultant displacement of 10 m, two displacement vectors of magnitude 6 m and 8 m should be combined
Perpendicular to each other
At angle 60°
Parallel
Antiparallel
The average binding energy of a nucleus inside an atomic nucleus is about
8 ergs
8 eV
8 Joules
8 MeV
A particle moving in a magnetic field has increase in its velocity, then its radius of the circle
Becomes half
Remains the same
Decreases
Increases
The velocity of falling raindrops attains limited value because of
Surface tension effect
Viscous force exerted by air
Air currents atmosphere
Up thrust of air
Two point charges A and B separated by a distance R attract each other with a force of 12 x 10-3N. The force between A and B when the charges on them are doubled and distance is halved
19.2 N
12 N
1.92 N
0.192 N
A charge Q is divided into two parts q and Q – q and separated by a distance R. The force of repulsion between them will be maximum when:
q = Q/4
q = Q/2
q = Q
None of these
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