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

The concept of direction is purely

Question # 2

Which is the most refined form of matter.

Question # 3

The existence of positron in 1928 was predicted by

Question # 4

The minimum frequency needed to emit an electron form metal surface is called:

Question # 5

De-Broglie waves are associated with

Question # 6

Application of wave like nature of particle is

Question # 7

The maximum kinetic energy of emitted photo electrons depends upon.

Question # 8

The emission of electrons from metal surface when exposed to light is called:

Question # 9

The materialization of energy take place in the process of.

Question # 10

Joule second is the unit of.

Question # 11

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

Question # 12

The energy of the photon of wavelength 500 nm is.

Question # 13

If the energy of photon is 10 eV and work function is 5 eV, then the a value of stopping potential will be

Question # 14

Number of electros emitted in photo electric effect depend upon.

Question # 15

Potassium Cathodes in photocell emit electrons for a light.

Question # 16

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

Question # 17

Minimum energy needed to escape an electron  ofrm metal surface is called:

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FSc Part II Physics Chapter 0 Important MCQ's

Sr.# Question Answer
1 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
2 We can never accurately describes all aspects of sbatomic particles simulatanously. It is correct according to:
A. Uncertainity Priciple
B. De-broglie Theory
C. Einstin Theory
D. Photo electric effect
3 In 1905, the special theory of relativity was proposed by
A. Einstein
B. Bohr
C. Maxwell
D. De Broglie
4 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.
5 Platinum wire becomes yellow at a temperature of.
A. 900 oC
B. 1300oC
C. 1600oC
D. 500oC
6 Number of electros emitted in photo electric effect depend upon.
A. Intensity of incident light
B. Frequency of incident light
C. Energy of incident light
D. Wavelength of incident of light
7 The energy of the photon of wavelength 500 nm is.
A. 3.10 eV
B. 2.49 eV
C. 1.77 eV
D. 1.52 eV
8 The principle regarding the dual nature of light was first discovered by
A. Heisenberg
B. Compton
C. J.J.Thomson
D. De-Broglie
9 The existence of positron was discovered in:
A. 1929
B. 1928
C. 1931
D. 1933
10 Pair production can take place only when energy of radiation is equal and greater than 1.02 MeV, thus correct option is.
A. X rays
B. Gama rays
C. Heat Radiation
D. Ultraviolet rays

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