ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

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

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

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 2

When a platinum wire is heated, it appears orange red at

Question # 3

The energy of photon 'E' is proported to

Question # 4

Wien's constant is measured in:

Question # 5

de-Broglies hypthesis was experimentally verified by

Question # 6

The special theory of relatively treats the problems involving:

Question # 7

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 8

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 9

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

Question # 10

The photon of radio-waves has energy of about

Question # 11

When a platinum wire is heated, it appears white at

Question # 12

Compton shift refers to:

Question # 13

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 14

The special theory of relativity treats problems invoving

Question # 15

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 16

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 17

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 18

As the light shines on the metal surface, the electrons are ejected

Question # 19

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 20

The concept of direction and position are purely

Question # 21

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 22

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 23

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 24

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 25

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 26

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 27

Strictly speaking, the earth is:

Question # 28

Intensity of light determines the:

Question # 29

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

Question # 30

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
2 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
3 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
4 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
5 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
6 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
7 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
8 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
9 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
10 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905

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