Second Year Physics Chapter 19 Online MCQ Test for 2nd Year Physics Chapter 19 Dawn of Modern Physics Preparation

FSC Part 2 Physics
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Physics FSC Part 2 Chapter 19 Online MCQ's Test

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Question # 1

Anti particle of electron is

Question # 2

Which one of the following physical quantities change with relativistic speed?

Question # 3

By modern system of NAVSTAR, the speed any where on the earth can be determined to accuracy about.

Question # 4

Which one of the following paved the way for modern physics

Question # 5

Pair production cannto take place in vacuum because :

Question # 6

The value of Stefan is constant is:

Question # 7

Compton shift is maximum for scattering angle of photon

Question # 8

When platinum is it becomes orange at

Question # 9

The unit of Plank's constant 'h' is.

Question # 10

The number of electrons emitted depends upon

Question # 11

Compton effect proves.

Question # 12

Pair production occurs only when energy of photon is at least equal in:

Question # 13

Unit of Stephen's constant is

Question # 14

When platinum wire is heated, it changes to cherry red at temperature.

Question # 15

We can never accurately describes all aspects of sbatomic particles simulatanously. It is correct according to:

Question # 16

If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor.

Question # 17

When platinum is it becomes orange at.

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FSc Part II Physics Chapter 0 Important MCQ's

Sr.# Question Answer
1 Eintein's Photoelectric equation is Ek= hf -∅ in this equation E1, refers to:
A. K.E of al the emited electrons
B. Mean K.E of emited electrons
C. Maximum K.E of emited electrons
D. Minimum K.E of emited electrons
2 The dimensions of Plank's constant is same as that of.
A. Energy
B. Power
C. Acceleration
D. Angular momentum
3 When the K.E. of photoelectric is zero, the frequency of incident photon is.
A. Less than
B. greater than
C. Equal to
D. Much greater
4 The Compton effect is associated with
A. X-rays
B. y-rays
C. Positive rays
D. ß-rays
5 The maximum kinetic energy of emitted photo electrons depends upon.
A. The intensity of incident light
B. Frequency of the incident light
C. Metal surface
D. Both frequency of incident light and metal surface.
6 Photo electrons are emitted y using visible light when the metal is.
A. sodium
B. Copper
C. Nicked
D. Cobalt
7 The wavelength associated with the protons moving at speed of 40 m/s is.
A. 7.20 nm
B. 9.02
C. 15.7 nm
D. 17.3 nm
8 A block body is an ideal:
A. Absorber
B. Radiator
C. Both a & b
D. None of above
9 The position has charge which is in magnitude equal to the charge on
A. Electron
B. Proton
C. β particle
D. All
10 Using relativistic effects the location of an air craft after an hour fight can be predicated about
A. 20 m
B. 50 m
C. 760 m
D. 780 m

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