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

The existence of position was predicted by Dirace in

Question # 2

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 3

When a platinum wire is heated, it appears dull red at about

Question # 4

Electromagnetic radiation or photons interact with matter in

Question # 5

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 # 6

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

Question # 7

The special theory of relativity is based on:

Question # 8

Which of the following is not an example of intertial frame

Question # 9

The value of threshold frequency for different metals is

Question # 10

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

The value of the Stephen's constant for black body radiations is given by

Question # 15

Momentum is a parameter associated with

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
3 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
4 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
5 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
6 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
7 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
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
8 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
9 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
10 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932

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