ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

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

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

  • Total Questions15

  • Time Allowed20

Start Test Download PDF

Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

00:00
Question # 1

Electromagnetic -radiation means:

Question # 2

The value of threshold frequency for different metals is

Question # 3

The concept of direction is purely:

Question # 4

From the theory of relativity, momentum p of the photon is related to energy as

Question # 5

Wien's constant is measured in:

Question # 6

The inside cavity of the black body is

Question # 7

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

Question # 8

The special theory of relativity treats problems invoving

Question # 9

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

Question # 10

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 11

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

Question # 12

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 13

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

Question # 14

Compton was awarded Nobel prize in physics in

Question # 15

The positron was discovered by:

Submit

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


Topic Test

00:00
Submit

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

  • F
    Farzand Shah Farzand Shah 01 - Jun - 2024 01 Min 03 Sec 60/60
  • D
    David Navid 28 - Mar - 2024 02 Min 29 Sec 60/60
  • M
    Maryam afzal Maryam afzal 25 - May - 2024 09 Min 18 Sec 60/60
  • A
    Arian Ahmed 09 - Mar - 2024 00 Min 27 Sec 55/60
  • C
    Chhabibullah1492 Habib 06 - Mar - 2024 05 Min 29 Sec 55/60
  • H
    Huzaifa Asim 26 - May - 2024 09 Min 46 Sec 55/60
  • B
    Bilal Javed 02 - Jun - 2024 03 Min 49 Sec 50/60
  • A
    Abdullah Zubair 08 - Jan - 2025 04 Min 17 Sec 50/60
  • M
    Muhammad Sufyan 01 - Jun - 2024 00 Min 08 Sec 45/60
  • M
    Maida Naveed 24 - May - 2024 03 Min 14 Sec 45/60
  • U
    umaima mubashar 31 - May - 2024 06 Min 17 Sec 45/60
  • F
    Fiza Saleem 03 - Dec - 2024 09 Min 36 Sec 45/60
  • T
    Tamshi Sohail 02 - May - 2024 03 Min 48 Sec 40/60
  • R
    rubina kousar 01 - Jun - 2024 04 Min 22 Sec 40/60
  • J
    Javeria Rajput 03 - Jun - 2024 05 Min 50 Sec 40/60

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 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
3 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
4 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
5 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
6 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
7 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
8 As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:
A. Smaller
B. Lerger
C. Same
D. Much larger
9 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
10 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these

Test Questions

Is this page helpful?