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3.	General Knowledge mcqs	4.	Pak Studies
5.	Physics mcqs

A wall is hit elastically and normally by n balls per second, all the balls have the same mass m and are moving with the same velocity u. The force exerted by the balls on the wall is_____

mnu²
2mnu²
2 mnu
1/2 mnu²

A hydrogen ion moving with a velocity of 10⁴m/s enters in magnetic field 10–⁴ T perpendicularly, then its radius of circular path is__________

10.01 m
1.01 m
101 m
0.101 m

Water rises to height ‘h’ in capillary tube. If the length of capillary tube above the surface of water is made less than ‘h’, then_____________

water does not rise at all.
water rises upto the tip of capillary tube and then starts overflowing like a fountain.
water rises upto the top of capillary tube and stays there without overflowing.
water rises upto a point a little below the top and stays there.

In photoelectric emission process from a metal of work function 8eV, the kinetic energy of moste energetic electrons is 0.5 eV. The corresponding stopping potential is_________

1.8 V
1.3V
0.5V
2.3V

In adiabauc process,

q(+) ve
q 1
q=0
q-ve

For a satellite revolving around the earth______

its P.E. and K.E. are +ve and the total energy is negative
its P.E. and K.E. are -ve but the total energy is positive
its P.E. and total energy are negative but the K.E. is positive
its P.E. and total energy are positive but its K.E. is negative

100 joule of work is performed in carrying a charge of ‒5 coulomb from infinity to a particular point in an uniform electrostatic fiel The potential of this point is_________

100 V
5 V
-20V
20 V

Which one of the following is not a unit of electric potential ?

JC-¹
V
W
NmC-¹

Find out incorrect statement,

irreversible process is rapid
maximum work is obtained from reversible process
reversible process is natural process
there is large difference between acting and opposing force in irreversible process

A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of 15ms– Then, the frequency of sound that the observer hears in the echo reflected from the cliff is : (Take velocity of sound in air = 330 ms–

765 Hz
800 Hz
838 Hz
885 Hz

Which of the following is a state function ?

Work done in cyclic process
Work done in isothermal process
Heat at constant pressure
Heat at constant volume

Two cars moving in opposite directions approach each other with speed of 22 m/s and 5 m/s respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is [velocity of sound 340 m/s] :-

361 Hz
411 Hz
448 Hz
350 Hz

The total energy of a particle executing a linear S.H.M. is proportional to______

frequency of oscillation
displacement from equilibrium position
square of the amplitude of motion
velocity in equilibrium position

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