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

From the theory of relativity, momentum p of the photon is related to energy as

Question # 2

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

Question # 3

The idea of quantization of energy was proposed by:

Question # 4

When platinum wire is heated, it appears cherry red at

Question # 5

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

Question # 6

Converse of pair production is known as

Question # 7

The energy of a photon is represented by

Question # 8

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 # 9

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 10

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 11

When a platinum wire is heated, it appears white at

Question # 12

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

Question # 13

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 14

Electromagnetic -radiation means:

Question # 15

Photoelectric effect takes place with a photon of:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
2 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light
3 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
4 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
5 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
6 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
7 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
8 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
9 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
10 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above

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