ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

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ECAT Physics Chapter 19 Dawn of Modern Physics

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Question # 1

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 2

The energy of a photon is represented by

Question # 3

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 4

Strictly speaking, the earth is:

Question # 5

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 6

Which one of the following physical quantities changes with relativistic speed

Question # 7

Intensity of light determines the:

Question # 8

Practically the quantity v/c is always:

Question # 9

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 10

Electromagnetic radiation or photons interact with matter in

Question # 11

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 12

A particle having mass and charge equal to that of an electron is called:

Question # 13

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 14

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

Question # 15

When platinum wire is heated, it appears cherry red at

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
2 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
3 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
4 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
5 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
6 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
7 The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson
8 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
A. 2.120°A
B. 0.212°A
C. 21.2°A
D. 0.14°
a
9 The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
10 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible

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