Physics MCQS with Answers
The initial velocity of a body moving along a straight line in 7 m/s. It has a uniform acceleration of 4 m/s2. The distance covered by the body in the 5th second of its motion is
50 m
25 m
85 m
35 m
At a certain instant a stationary transverse wave is found to have maximum kinetic energy. The appearance of string of that instant is:
Straight line
Sinusoidal shape with amplitude A/3
Sinusoidal shape with amplitude A
Sinusoidal shape with amplitude A/2
A prism splits a beam of white light into its seven constituent colors. This is so because
Energy of different colors is different
Phase of different colors is different
Velocity of different colors is different
Amplitude of different colors is different
A photocell with a constant p.d. of V volt across it illuminated by a point source from a distance of 25 cm. When the source is moved to a distance of 1m, the electrons emitted by the photocell
Are 1/16th as numerous as before
Carry 1/4th their momentum
Carry 1/4th their energy
Are 1/4th as numerous as before
The contrast in the fringes in any interference pattern depends on
Distance between the slits
Wavelength
Fringe width
Intensity ratio of the sources
A fly is sitting on the objective of a telescope pointed towards the moon.
There is a reduction in the intensity of the image
The entire of view blocked
There is an image of the fly on the photography
There is no effect at all
Who explained the origin of the Fraunhoffer lines?
Fresnel
Fraunhoffer
Kirchhoff
Snell
If tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting. Calculate the focal length of objective
100 cm
20 cm
25 cm
10 cm
According to the Hooke’s law the force required to change the length of a wire by ‘I’ is proportional to
I
I-1
I-2
I2
If the dot product of two non-zero vectors vanishes, the vectors will be
Zero
Perpendicular to each other
Opposite to each other
In the same direction
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