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 Einstein's changes in length, mass and time are not observed in common life because

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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 # 6

The special theory of relativity is based on the

Question # 7

The inside cavity of the black body is

Question # 8

The unit of work function is:

Question # 9

According to the special theory of relativity, a moving clock

Question # 10

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

Question # 11

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

Question # 12

The concept of direction and position are purely

Question # 13

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

Question # 14

A particle having mass and charge equal to that of an electron is called:

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
2 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
3 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
4 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
5 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
6 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
7 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
8 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)
9 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
10 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV

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