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

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 2

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 3

According to the Max plank, energy is redialed or absorbed in

Question # 4

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

Question # 5

The photon of radio-waves has energy of about

Question # 6

The unit of work function is:

Question # 7

Which one of the following physical quantities changes with relativistic speed

Question # 8

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

Question # 9

Newton's law of motion do not hold in

Question # 10

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

Question # 11

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 12

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

Question # 13

At the temperature, a body emits radiation which is principally

Question # 14

The positron was discovered by:

Question # 15

Position was discovered by Carl Anderson in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
2 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
3 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
4 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
5 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
6 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
7 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
8 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
9 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
10 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White

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