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

Try The 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

00:00
Question # 1

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

Question # 2

The special theory of relativity is based on:

Question # 3

When a platinum wire is heated, it appears orange red at

Question # 4

When a platinum wire is heated, it appears dull red at about

Question # 5

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

Question # 6

The length contraction happens only

Question # 7

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

Question # 8

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 9

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

Question # 10

There is no way to detect:

Question # 11

The year when A.H. compton was awarded Nobel Prize is:

Question # 12

At the temperature, a body emits radiation which is principally

Question # 13

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 # 14

The inside cavity of the black body is

Question # 15

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

Question # 16

Converse of pair production is known as

Question # 17

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 18

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

Question # 19

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 20

the dilation of time applies to the timing processes which are:

Question # 21

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

Question # 22

Which of the following is not an example of intertial frame

Question # 23

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 24

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

Question # 25

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

Question # 26

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

Question # 27

Absolute motion cannot be detected

Question # 28

When a platinum wire is heated, it appears white at

Question # 29

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 30

The special theory of relativity treats problems invoving

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
2 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
3 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
4 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
5 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
6 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
7 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
8 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
9 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
10 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

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