ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 2

The Einstein's changes in length, mass and time are not observed in common life because

Question # 3

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 4

The general theory of relativity treats problems involving

Question # 5

Wien's constant is measured in:

Question # 6

Photoelectrons are emitted when ultraviolet light falls on:

Question # 7

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 8

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 9

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

Question # 10

The mass of an object will be doubled at speed

Question # 11

When a position comes close to an electron they annihilate into photons such that

Question # 12

According to the special theory of relativity, time is

Question # 13

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 14

The idea of quantization of energy was proposed by:

Question # 15

The unit of work function is:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
2 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
3 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
4 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
5 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
6 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
7 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
8 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
9 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
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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