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

According to the special theory of relativity, time is

Question # 2

The special theory of relativity is based on:

Question # 3

The photon of radio-waves has energy of about

Question # 4

Photoelectric effect takes place with a photon of:

Question # 5

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

Question # 6

Davision and Germer performed experiment to verify

Question # 7

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 8

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

Question # 9

Newton's law of motion do not hold in

Question # 10

Which of the following is not an example of intertial frame

Question # 11

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

According to the Max plank, energy is redialed or absorbed in

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
    Sanja Account 28 - Jun - 2026 02 Min 38 Sec 56/60
  • 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

ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
2 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
3 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
4 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
5 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
6 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
7 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
8 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
9 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
10 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well

Test Questions