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

The length contraction happens only

Question # 2

The idea of quantization of energy was proposed by:

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

Which of the following is not an example of intertial frame

Question # 5

The nature of radiations emitted by a hot body depends upon its:

Question # 6

When a platinum wire is heated, it appears orange red at

Question # 7

The photon of radio-waves has energy of about

Question # 8

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

Question # 9

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 10

According to the special theory of relativity

Question # 11

With the help of 50 K v electron microscope, a resolution of

Question # 12

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

Question # 13

Compton shift refers to:

Question # 14

A black body is

Question # 15

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

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
  • S
    suzi 11 - Feb - 2026 00 Min 43 Sec 52/60
  • 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

ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
2 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
3 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
4 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
5 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
6 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
7 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
8 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
9 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
10 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford

Test Questions

Is this page helpful?