ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

  • Total Questions15

  • Time Allowed20

Start Test Download PDF

ECAT Physics Chapter 19 Dawn of Modern Physics

00:00
Question # 1

The existence of position was predicted by Dirace in

Question # 2

Position was discovered by Carl Anderson in

Question # 3

Photoelectrons are emitted when ultraviolet light falls on:

Question # 4

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

Question # 5

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

Question # 6

The energy of the 4th orbit in hydrogen atom is

Question # 7

When a position comes close to an electron they annihilate into

Question # 8

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

Question # 9

When a platinum wire is heated, it appears white at

Question # 10

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

Question # 11

The unit of work function is:

Question # 12

In photoelectric effect the energy of ejected electrons depend on

Question # 13

At the temperature, a body emits radiation which is principally

Question # 14

According to the special theory of relativity, a moving clock

Question # 15

When a platinum wire is heated, it appears yellow at

Submit

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


Topic Test

00:00
Submit

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

  • A
    Anayat Ali 03 - Apr - 2024 00 Min 25 Sec 60/60
  • H
    HAMZA Shah 21 - Sep - 2021 00 Min 42 Sec 60/60
  • U
    Umer Usman 10 - Mar - 2024 01 Min 08 Sec 60/60
  • S
    Sana Hashim 23 - May - 2022 02 Min 21 Sec 55/60
  • T
    Tayyaba 28 - Feb - 2018 04 Min 27 Sec 55/60
  • A
    Abdullah Baloch 11 - Aug - 2024 04 Min 52 Sec 55/60
  • R
    Rabbia Munir 06 - Mar - 2024 02 Min 16 Sec 50/60
  • M
    MusiCore 15 - Mar - 2023 02 Min 27 Sec 50/60
  • M
    Muqadas Zahra 14 - Apr - 2022 02 Min 34 Sec 45/60
  • Z
    Zia Ullah Chahal 08 - Mar - 2024 01 Min 39 Sec 40/60
  • B
    Benjamin Joseph 01 - Mar - 2023 02 Min 51 Sec 40/60
  • A
    arbeel ejaz 09 - Mar - 2023 04 Min 07 Sec 40/60
  • F
    Farhan 07 - Jan - 2019 05 Min 18 Sec 40/60
  • N
    nageena safdar 08 - Jul - 2024 09 Min 20 Sec 40/60
  • U
    Unknown 01 - Mar - 2023 00 Min 19 Sec 35/60

ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 When a position comes close to an electron they annihilate into photons such that
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these
3 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
4 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
5 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
6 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
7 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
8 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
9 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV
10 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron

Test Questions

Is this page helpful?