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Author: Zabeehullah

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The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6 eV fall on it is 4 eV. The stopping potential in volt is________

4
6
8
10

Zabeehullah
Past Papers MCQs, Physics mcqs

The electrodes of a Gunn diode are made of______

molybdenum
GaAs
gold
copper

Zabeehullah
Past Papers MCQs, Physics mcqs

If at a place the speed of a sound wave of frequency 300 Hz is V, the speed of another wave of frequency 150 Hz at the same place will be:

V
V/2
2V
4V

Zabeehullah
Past Papers MCQs, Physics mcqs

The difference between boiling and evaporation is that____________

evaporation can occur at any temperature
boiling can occur at any temperature
evaporation can not occur at any temperature
none of the above

Zabeehullah
Past Papers MCQs, Physics mcqs

In gases of diatomic molecule, the ratio of two specific heat is

1.4
1.67
1.33
1.11

Zabeehullah
Past Papers MCQs, Physics mcqs

For a dipole, the value of each charge is 10–10 stat coulomb and their separation is 1Å, then its dipole moment is _______

one debye
2 debye
10–3 debye
3 × 10–20 debye

Zabeehullah
Past Papers MCQs, Physics mcqs

A spring wrist watch keeps correct time at the equator. If it is taken to poles, then________

it keeps correct time
it loses time
it gains time
it does not give correct time

Zabeehullah
Past Papers MCQs, Physics mcqs

A circuit contains R, L and C connected in series with an source. The values of the reactances for inductor and capacitor are 200Ω and 600 Ω respectively and the impedance of the circuit is Z1 . What happens to the impedance of the same circuit if the values of the reactances are interchanged____________

The impedance will remain unchanged
The impedance will increase
The impedance will decrease
Information insufficient

Zabeehullah
Past Papers MCQs, Physics mcqs

Which of the following element has least number of electrons in its M-shell?

K
Mn
Ni
Sc

Zabeehullah
Past Papers MCQs, 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

Zabeehullah
Past Papers MCQs, Physics mcqs

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

Zabeehullah
Past Papers MCQs, Physics mcqs

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

Zabeehullah
Past Papers MCQs, Physics mcqs

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

modulation
demodulation
detection
multiplexing

Zabeehullah
Past Papers MCQs, Physics mcqs

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