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

Question # 2

the symbol to be used in relativity problems denotes:

Question # 3

A non-inertial frame of reference is one, in which

Question # 4

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

Question # 5

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

Question # 6

A photon is considered to have

Question # 7

The Stephen-Boltzmann law for the black body radiation is given by

Question # 8

Photoelectrons are emitted when ultraviolet light falls on:

Question # 9

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Question # 10

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

Question # 11

According to the special theory of relativity, time is

Question # 12

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 13

The energy of a photon is represented by

Question # 14

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

Question # 15

The year when A.H. compton was awarded Nobel Prize is:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
2 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
3 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
4 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
5 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
6 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
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 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
9 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
10 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite

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