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

Compton shift refers to:

Question # 2

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 3

The idea of quantization of energy was proposed by:

Question # 4

If a material object moves with the speed of light 'C' its mass becomes

Question # 5

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 6

The special theory of relativity is based on the

Question # 7

The mass of an object will be doubled at speed

Question # 8

An intertial frame of reference is a frame of reference which is

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

Due to relative motion of observer and the frame of reference of events, time always:

Question # 13

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

Question # 14

Wave nature of particle was proposed by

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
3 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
4 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
5 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
6 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
7 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
8 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
9 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
10 Davision and Germer performed experiment to verify
A. de-Brogile hypothesis
B. theory of relativity
C. Newton's law of gravitation
D. Mass-energy relation

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