Physics MCQS with Answers
A lens behaves as a converging lens in air and a diverging lens in water. The refractive index of the material is
Greater than 1.33
Equal to unity
Equal to 1.33
Between unity and 1.33
In an A.C. circuit, a resistance of R ohm is connected in series with an inductance L. If phase angle between voltage and current be 45° the value of inductive reactance will be
R
R/4
R/2
Cannot be found with the given data
At constant volume temperature is increased. Then
Collision on walls will be less
Number of collisions per unit time will increase
Collisions will not change
Collisions will be in straight lines
If a diamagnetic substance is brought near north or south pole of a bar magnet it is
Attracted by the poles
Attracted by the north pole and repelled by the south pole
Repelled by north pole and attracted by the south pole
Repelled by the poles
Centre of mass is a point
Which is geometric centre of a body
From which distance of particles are same
Which is the origin of reference frame
Where the whole mass of the body is supposed to be centered
A wire of radius r has resistance R, It it is stretched to a wire of r/2 radius, then the resistance becomes
Zero
16R
4R
2R
A conducting wire is drawn to double its length. Final resistivity of the material will be
Double of the original one
Same as original one
Half of the original one
One-fourth of the original one
Velocity of sound in a diatomic as is 300 m/sec, what is its rms velocity?
40 m/sec
430 m/sec
300 m/sec
400 m/sec
The twinkling of stars is due to
Intermittent absorption of star light by its own atmosphere
The refractive index of the earth’s atmosphere fluctuate
The fact that stars do not emit light continuously
None of these
In case of p-n junction diode, at high value of reverse bias, the current rises sharply. The value of reverse bias is known as:
Zener voltage
Inverse voltage
Cut off voltage
Critical voltage
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