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 photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 2

The concept of direction and position are purely

Question # 3

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

Question # 4

The energy of the 4th orbit in hydrogen atom is

Question # 5

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

Question # 6

An inertial frame is that frame in which

Question # 7

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

Question # 8

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

Question # 9

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 10

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 # 11

Compton was awarded Nobel prize in physics in

Question # 12

0.1 kg mass will be equivalent to the energy

Question # 13

The value of threshold frequency for different metals is

Question # 14

In photoelectric effect the energy of ejected electrons depend on

Question # 15

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

Question # 16

Wien's constant is measured in:

Question # 17

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

Question # 18

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 19

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

Question # 20

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

Question # 21

Davision and Germer performed experiment to verify

Question # 22

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 23

The special theory of relativity is based on:

Question # 24

The concept of direction is purely:

Question # 25

As the light shines on the metal surface, the electrons are ejected

Question # 26

When a position comes close to an electron they annihilate into photons such that

Question # 27

Electromagnetic radiation or photons interact with matter in

Question # 28

The value of the plank's constant 'h' is given by

Question # 29

Pair production is the phenomenon in which

Question # 30

When a platinum wire is heated, it appears white at

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
2 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
3 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
4 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
5 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
6 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
7 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
8 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
9 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
10 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1

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