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

Momentum is a parameter associated with

Question # 2

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 3

The mass of an object will be doubled at speed

Question # 4

When a platinum wire is heated, it appears yellow at

Question # 5

Victor de-Brogile received the Nobel prize in physics in

Question # 6

Which one of the following physical quantities changes with relativistic speed

Question # 7

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 8

In order to produce pair production, a photon must have a energy

Question # 9

Compton was awarded Nobel prize in physics in

Question # 10

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 11

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

Question # 12

The concept of direction is purely:

Question # 13

The energy of photon 'E' is proported to

Question # 14

The photon of radio-waves has energy of about

Question # 15

With the help of 50 K v electron microscope, a resolution of

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
2 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
3 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
4 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
5 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
6 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
7 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
8 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
9 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
10 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C

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