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

Wien's constant is measured in:

Question # 2

The energy of the 4th orbit in hydrogen atom is

Question # 3

Strictly speaking, the earth is:

Question # 4

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

Question # 5

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

Question # 6

In photoelectric effect the energy of ejected electrons depend on

Question # 7

Pair production is the phenomenon in which

Question # 8

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 9

The value of threshold frequency for different metals is

Question # 10

According to the special theory of relativity

Question # 11

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

Question # 12

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 13

The unit of work function is:

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

When the atomic particle are moving with velocities approaching that of light:

Question # 18

Photocell is a device which converts

Question # 19

Momentum is a parameter associated with

Question # 20

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

Question # 21

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

Question # 22

Newton's law of motion do not hold in

Question # 23

Victor de-Brogile received the Nobel prize in physics in

Question # 24

When a platinum wire is heated, it appears white at

Question # 25

The photon of radio-waves has energy of about

Question # 26

The concept of direction and position are purely

Question # 27

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

Question # 28

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

Question # 29

At the temperature, a body emits radiation which is principally

Question # 30

S.I. unit of planks constant is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
2 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
3 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
4 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
5 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
6 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
7 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
8 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
9 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
10 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

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