Category: Past Papers MCQs

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1.	Biology mcqs	2.	Chemistry mcqs
3.	General Knowledge mcqs	4.	Pak Studies
5.	Physics mcqs

Surface of sodium is illuminated by a light of 6000Å wavelength. Work function of sodium is 6 eV.Then minimum K.E. of emitted electrons is _____

0 eV
1.53 eV
2.46 eV
4.14 eV

Boiling tea in a tea pot which is not closed is a/ an _________

open system
closed system
homogenous system
isolated system

A 400 pF capacitor is charged with a 100 V battery. After disconnecting the battery this capacitor is connected with another 400 pF capacitor. Then the energy loss is_______

1 × 10–⁶J
2 × 10–⁶J
3 × 10–⁶ J
4 × 10–⁶ J

When the current through a solenoid increases at a constant rate, the induced current.

is a constant and is in the direction of the inducing current
is a constant and is opposite to the direction of the inducing current
increase with time and is in the direction of the inducing current
increase with time and opposite to the direction of the inducing current

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

The electrodes of a Gunn diode are made of______

molybdenum
GaAs
gold
copper

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

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

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

1.4
1.67
1.33
1.11

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

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

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

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

K
Mn
Ni
Sc

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