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

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Question # 1

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 # 2

The general theory of relativity treats problems involving

Question # 3

Pair production is the phenomenon in which

Question # 4

Strictly speaking, the earth is:

Question # 5

The concept of direction is purely:

Question # 6

An inertial frame is that frame in which

Question # 7

Position was discovered by Carl Anderson in

Question # 8

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

Question # 9

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

Question # 10

There is no way to detect:

Question # 11

When a platinum wire is heated, it appears white at

Question # 12

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

Question # 13

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 14

According to the special theory of relativity

Question # 15

Electromagnetic radiation or photons interact with matter in

Question # 16

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

Question # 17

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

Question # 18

The mass of an object will be doubled at speed

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

A black body is

Question # 23

the symbol to be used in relativity problems denotes:

Question # 24

The special theory of relativity is based on:

Question # 25

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

Question # 26

Compton was awarded Nobel prize in physics in

Question # 27

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

Question # 28

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

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Max Planck received the Nobel Prize for his discovery of energy quants in:
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD
2 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
3 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
4 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
5 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m
6 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
7 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
8 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
9 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
10 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these

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