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Category: Past Papers MCQs

No.	Topics.	No.	Topics.
1.	Biology mcqs	2.	Chemistry mcqs
3.	General Knowledge mcqs	4.	Pak Studies
5.	Physics mcqs

A radioactive nucleus of mass M emits a photon of frequency n and the nucleus recoils. The recoil energy will be ________

Mc²– hn
h²v²/ Mc²
Zero
hn

The inverter is_____

an OR gate
A NOT gate
an AND gate
a combination of OR and AND gates

0 g of a gas occupies 4 litres at NTP. The specific heat capacity of the gas at constant volume is 0 JK–1 mol–1 . If the speed of sound in this gas at NTP is 952 ms–1, then the heat capacity at constant pressure is________ (Take gas constant R = 3 JK–1 mol–

8.5 JK–1 mol–1
8.0 JK–1 mol–1
7.5 JK–1 mol–1
7.0 JK–1 mol–1

Two sound sources (of same frequency. are placed at distance of 100 meter. An observer, when moving between both sources, hears 4 beats per secon The distance between sound source is now changed to 400 meter then the beats/second heard by observer will be:

2
4
8
16

The potential energy of a particle executing a linear S.H.M., at a distance x from the equilibrium position is directly proporhonal to_______

x
x²
x³
None

The magnifying power of the objective of a compound microscope is 7 if the magnifying power of the microscope is 35, then the magnifying power of eyepiece will be __________

245
5
28
42

A bus is moving with a speed of 10 m/s on a straight roa A scooterist wishes to overtake the bus in 100 s. If the bus is at a distance of 1 km from the scooterist, with what speed should the scooterist chase the bus ?

10 m/s
20 m/s
40 m/s
25 m/s

In the above question, the angular velocity will be____________

increase
decrease
not change
nothing can be said

Doppler effect for sound depends upon the relative motion of source and listener and it also depends upon that which one of these is in motion. Whereas in doppler effect for light it only depends upon the relative motion of the source of light and observer. The reason for it is :

Einstein's mass energy relation
Einstein's theory of relativity
Photo electric effect
none of above

An electric motor is a device which transforms______________

Mechanical energy into electrical energy
Electrical energy into mechanical energy
Kinetic energy into potential energy
Electrical energy into Potential energy

A coil of copper wire is connected in series with a bulb, a battery and a switch. When the circuit is completed the bulb lights up immediately. The circuit is switched off and a rod of soft iron is placed inside the coil. On completing the circuit again. It is observed that__________

Bulb is not so bright
There is a slight delay before bulb lights to its normal brightness
The bulb is initially bright but gradually becomes dim
The bulb is brighter than before

Momentum of a body of mass 0.5 kg moving with a speed of 10 m/s is__________

2.5 kg.m/s
5 kg.m/s
0.5 kg.m/s
50 kg.m/s

Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the voltage is increased to 100 kV then the de-Broglie wavelength associated with the electrons would __________

increase by 2 times
decrease by 2 times
decrease by 4 times
increase by 4 times

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