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

Question # 2

S.I. unit of planks constant is

Question # 3

According to the special theory of relativity

Question # 4

The value of the plank's constant 'h' is given by

Question # 5

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

Question # 6

According to the special theory of relativity, time is

Question # 7

A black body is

Question # 8

When a position comes close to an electron they annihilate into

Question # 9

The idea of quantization of energy was proposed by:

Question # 10

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 11

Victor de-Brogile received the Nobel prize in physics in

Question # 12

Wien's constant is measured in:

Question # 13

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 14

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

Question # 15

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

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
  • 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
  • J
    Javeria Rajput 03 - Jun - 2024 05 Min 50 Sec 40/60

ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
3 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
4 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
5 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
6 The value of the plank's constant 'h' is given by
A. 1.6 x 10-19J
B. 1.67 x 10-27Kg
C. 6.63 x 1034Js
D. 6.63 x 10-34Js
7 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
8 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
9 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
10 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m

Test Questions

Is this page helpful?