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 analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 2

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 3

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

Question # 4

Victor de-Brogile received the Nobel prize in physics in

Question # 5

Davision and Germer performed experiment to verify

Question # 6

Position was discovered by Carl Anderson in

Question # 7

Pair production is the phenomenon in which

Question # 8

Momentum is a parameter associated with

Question # 9

Converse of pair production is known as

Question # 10

The length contraction happens only

Question # 11

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

Question # 12

the symbol to be used in relativity problems denotes:

Question # 13

There is no way to detect:

Question # 14

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 15

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

Question # 16

Compton was awarded Nobel prize in physics in

Question # 17

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

Question # 18

The inside cavity of the black body is

Question # 19

When a platinum wire is heated, it appears white at

Question # 20

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

Question # 21

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

Question # 22

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

Question # 23

The concept of direction is purely:

Question # 24

The general theory of relativity treats problems involving

Question # 25

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

Question # 26

Electromagnetic -radiation means:

Question # 27

Electromagnetic radiation or photons interact with matter in

Question # 28

The energy of a photon is represented by

Question # 29

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

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 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
2 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
3 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
4 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
5 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
6 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
7 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
8 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light
9 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
10 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923

Test Questions

Is this page helpful?