ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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

A

Asghar Ali 03 - Mar - 2021 10 Min 50 Sec 100/120
S

shamsuddin 19 - Aug - 2021 10 Min 50 Sec 75/120
K

khadim Hussain 03 - Mar - 2021 10 Min 50 Sec 75/120
A

Ali ahmad 19 - Jul - 2018 09 Min 44 Sec 70/120
A

Aarij 08 - Dec - 2024 02 Min 25 Sec 65/120
W

Waleed Ahmed 26 - Feb - 2023 10 Min 00 Sec 65/120
Z

Ziyad Rehman Sheikh 16 - Nov - 2022 07 Min 21 Sec 40/120
M

maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	When the atomic particle are moving with velocities approaching that of light:	A. Newton's laws become valid B. Relativistic effects become prominent C. Botha(A) and (B) are valid D. Neither (A)nor (B)
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	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
4	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
5	Photocell is a device which converts	A. chemical energy into electrical energy B. electrical energy into light energy C. heat energy into electrical energy D. light energy into electrical energy
6	Pair production is the phenomenon in which	A. matter is converted into energy B. energy is converted into matter C. light is converted into electrical energy D. electrical energy is converted into light
7	The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by	A. Max plank B. Newton C. Einstein D. J.J. Thomson
8	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
9	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
10	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these

Latest Educational News Stories

Pakistan's Largest Database of Colleges and Universities

BS Programs

University Past Papers

University Results

Exam Results 2024

Study Abroad Programs and Opportunities for Pakistani Students

ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

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

ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

The length contraction happens only

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

At the temperature, a body emits radiation which is principally

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

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

The special theory of relatively treats the problems involving:

The energy of photon 'E' is proported to

According to the special theory of relativity, a moving clock

The value of the Stephen's constant for black body radiations is given by

If a material object moves with the speed of light 'C' its mass becomes

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

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

The concept of direction and position are purely

The energy of a photon is represented by

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

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

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

The mass of an object will be doubled at speed

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

The idea of quantization of energy was proposed by:

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

the symbol to be used in relativity problems denotes:

Which one of the following physical quantities changes with relativistic speed

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

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

According to the special theory of relativity

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Which of the following phenomenon proves the particle nature of light

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

Set 1

Set 2

Set 3

Set 4

Set 5

Topic Test

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

ECAT Physics Chapter 19 Important MCQ's

Test Questions

Is this page helpful?

Share your comments & questions here