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

  • Total Questions30

  • Time Allowed30

Start Test Download PDF

ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

00:00
Question # 1

The special theory of relativity treats problems invoving

Question # 2

Newton's law of motion do not hold in

Question # 3

In photoelectric effect the energy of ejected electrons depend on

Question # 4

S.I. unit of planks constant is

Question # 5

Compton was awarded Nobel prize in physics in

Question # 6

Photocell is a device which converts

Question # 7

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

Question # 8

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

Question # 9

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 10

According to the special theory of relativity, time is

Question # 11

At the temperature, a body emits radiation which is principally

Question # 12

The photon of radio-waves has energy of about

Question # 13

When a position comes close to an electron they annihilate into

Question # 14

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

Question # 15

The concept of direction is purely:

Question # 16

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

Question # 17

The length contraction happens only

Question # 18

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

Question # 19

Which one of the following physical quantities changes with relativistic speed

Question # 20

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

Question # 21

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

Question # 22

The unit of work function is:

Question # 23

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

Question # 24

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 25

The energy of photon 'E' is proported to

Question # 26

Position was discovered by Carl Anderson in

Question # 27

The positron was discovered by:

Question # 28

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

Question # 29

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

Question # 30

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

Submit

Prepare Complete Set Wise ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQs Online With Answers


Topic Test

00:00
Submit

Top Scorers Of ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQ`s Test

  • A
    Asghar Ali 03 - Mar - 2021 10 Min 50 Sec 100/120
  • S
    shamsuddin 19 - Aug - 2021 10 Min 50 Sec 75/120
  • K
    khadim Hussain 03 - Mar - 2021 10 Min 50 Sec 75/120
  • A
    Ali ahmad 19 - Jul - 2018 09 Min 44 Sec 70/120
  • A
    Aarij 08 - Dec - 2024 02 Min 25 Sec 65/120
  • W
    Waleed Ahmed 26 - Feb - 2023 10 Min 00 Sec 65/120
  • Z
    Ziyad Rehman Sheikh 16 - Nov - 2022 07 Min 21 Sec 40/120
  • M
    maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
2 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
3 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
4 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these
5 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
6 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
7 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
8 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
9 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
10 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)

Test Questions