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5.	Physics mcqs

When a point source of monochromatic light is at a distance of 0.2 m from a photoelectric cell, the cut – off voltage and the saturation current are 0.6 volt and 18 mA respectively. If the same source is placed 0.6 m away from the photoelectric cell,then ________

The stopping potential will be 0.2 V
The stopping potential will be 0.6 V
The saturation current will be 6 mA
The saturation current will be 18 mA

Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross-sectional area 3 If the length of the first wire is increased by ∆/ on applying a force F, how much force is needed to stretch the second wire by the same amount ?

9F
6F
4F
F

Two waves of frequency 10 KHz and 2 KHz propagate and superimpose. Time after which wave envelope repeats is :-

5 ms
10 ms
0.5 ms
50 ms

The process of superimposing information signals on a carrier wave is called_____

modulation
demodulation
detection
multiplexing

Which of the following is true about the angular momentum of a cylinder rolling down a slope without slipping ?

Its magnitude changes but the direction remains same
both magnitude and direction change
only the direction change
neither change

It is necessary to master some common sense of safe electricity use in life. The correct one of the following practices is______

Turn off the power before replacing the bulb
When an electrical appliance catches fire, first put out the fire with water, and then cut off the power
Dry wet clothes directly on power lines
When someone is found to be electrocuted, pull them away with their hands

In a single slit diffraction, slit width is 0.6 mm and distance of first minima from central position is 1mm. If screen distance is 2 m, then wave length of light is____________

500 nm
600 nm
200 nm
100 nm

At what temperature does the temperature in Celsius and Fahrenheit equalise______

–40°
40°
36.6°
38°

A ball rises to surface at a constant velocity in liquid whose density is 4 times than that of the material of the ball. The ratio of the force of friction acting on the rising ball and its weight is____________

3 : 1
4 : 1
1 : 3
1:04

What is the cause of greenhouse effect ?

Infrared rays
Ultraviolet rays
X-rays
Radio waves

Water is falling on the blades of a turbine at a rate of 100 kg/s from a certain spring. If the height of the spring be 100 metres, the power transferred to the turbine will be _________

100 kW
10 kW
30 1 kW
1000 kW

Two charged parallel plate capacitors, each with separation between plates equal to d, are separated by a large distance L >> Then the force of interaction between them is proportional to_______

1/d²
d2/L⁴
1/d³
d2/L³

Thickness of a pencil measured by using a screw gauge (least count .001 cm. comes out to be 0.802 cm. The percentage error in the measurement is______

0.13%
2.43%
4.12%
2.14%

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