ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

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

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

The special theory of relatively treats the problems involving:

Question # 2

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

Question # 3

When platinum wire is heated, it appears cherry red at

Question # 4

Davision and Germer performed experiment to verify

Question # 5

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 6

Photoelectric effect takes place with a photon of:

Question # 7

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 8

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 # 9

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

Question # 10

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

Question # 11

At the temperature, a body emits radiation which is principally

Question # 12

When a platinum wire is heated, it appears yellow at

Question # 13

The general theory of relativity treats problems involving

Question # 14

Victor de-Brogile received the Nobel prize in physics in

Question # 15

The special theory of relativity is based on:

Question # 16

The concept of direction is purely:

Question # 17

A photon is considered to have

Question # 18

The energy of photon 'E' is proported to

Question # 19

Intensity of light determines the:

Question # 20

According to the special theory of relativity, a moving clock

Question # 21

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

Question # 22

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

Question # 23

Wien's constant is measured in:

Question # 24

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

Question # 25

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

Question # 26

Pair production is the phenomenon in which

Question # 27

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

Question # 28

Which of the following is not an example of intertial frame

Question # 29

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

Question # 30

The existence of position was predicted by Dirace in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
2 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
3 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
4 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
5 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
A. 2.120°A
B. 0.212°A
C. 21.2°A
D. 0.14°
a
6 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
7 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
8 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)
9 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
10 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these

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