ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

The energy of photon 'E' is proported to

Question # 2

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

Question # 3

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

Question # 4

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 5

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

Question # 6

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

Question # 7

There is no way to detect:

Question # 8

The existence of position was predicted by Dirace in

Question # 9

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

Question # 10

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

Question # 11

When the atomic particle are moving with velocities approaching that of light:

Question # 12

Intensity of light determines the:

Question # 13

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

Question # 14

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

Question # 15

Absolute motion cannot be detected

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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 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light
3 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:
A. Smaller
B. Lerger
C. Same
D. Much larger
4 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
5 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
6 Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as
A. ON switch
B. off switch
C. function switch
D. none of these
7 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
8 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
9 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
10 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these

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