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

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

Question # 2

Absolute motion cannot be detected

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

Momentum is a parameter associated with

Question # 7

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 8

The mass of an object will be doubled at speed

Question # 9

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 10

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

Question # 11

Converse of pair production is known as

Question # 12

Compton was awarded Nobel prize in physics in

Question # 13

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

Question # 14

Due to relative motion of observer and the frame of reference of events, time always:

Question # 15

Which of the following is not an example of intertial frame

Question # 16

When a platinum wire is heated, it appears yellow at

Question # 17

As the light shines on the metal surface, the electrons are ejected

Question # 18

The existence of position was predicted by Dirace in

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

Davision and Germer performed experiment to verify

Question # 23

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

Question # 24

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

Question # 25

The concept of direction and position are purely

Question # 26

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

Question # 27

Compton shift refers to:

Question # 28

According to the special theory of relativity

Question # 29

According to the Max plank, energy is redialed or absorbed in

Question # 30

The idea of quantization of energy was proposed by:

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 A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
A. decreases
B. first increases then decreases
C. increases
D. any one of them
2 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
3 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
4 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
5 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
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 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
8 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
9 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
10 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero

Test Questions

Is this page helpful?