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

When platinum wire is heated, it appears cherry red at

Question # 2

The general theory of relativity treats problems involving

Question # 3

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

Question # 4

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 # 5

Momentum is a parameter associated with

Question # 6

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 # 7

The positron was discovered by:

Question # 8

When a position comes close to an electron they annihilate into

Question # 9

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 # 10

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

Question # 11

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

Question # 12

The mass of an object will be doubled at speed

Question # 13

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

Question # 14

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

Question # 15

When a platinum wire is heated, it appears white at

Question # 16

Which of the following is not an example of intertial frame

Question # 17

Converse of pair production is known as

Question # 18

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

Question # 19

An intertial frame of reference is a frame of reference which is

Question # 20

According to the special theory of relativity, a moving clock

Question # 21

An inertial frame is that frame in which

Question # 22

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

Question # 23

Strictly speaking, the earth is:

Question # 24

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 25

According to the special theory of relativity

Question # 26

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 27

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

Question # 28

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

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
2 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
3 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
4 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
5 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
6 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
7 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
8 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
9 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
10 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C

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