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

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Asghar Ali 03 - Mar - 2021 10 Min 50 Sec 100/120
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shamsuddin 19 - Aug - 2021 10 Min 50 Sec 75/120
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khadim Hussain 03 - Mar - 2021 10 Min 50 Sec 75/120
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Ali ahmad 19 - Jul - 2018 09 Min 44 Sec 70/120
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Aarij 08 - Dec - 2024 02 Min 25 Sec 65/120
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Waleed Ahmed 26 - Feb - 2023 10 Min 00 Sec 65/120
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Ziyad Rehman Sheikh 16 - Nov - 2022 07 Min 21 Sec 40/120
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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
2	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
3	If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:	A. Newton B. Joule C. Joule-Sec D. Joule-s^-1
4	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
5	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
6	The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is	A. 100 J B. 1.6 x 10^-17J C. 100 eV D. 1.6 x 10^-17eV
7	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
8	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always
9	Absolute motion cannot be detected	A. in its own frame of references B. in a different frame of references C. both in its frame and different frame of references D. none of these
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

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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

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

According to the special theory of relativity, a moving clock

A non-inertial frame of reference is one, in which

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

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:

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

In photoelectric effect the energy of ejected electrons depend on

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Pair production is the phenomenon in which

Electromagnetic -radiation means:

Converse of pair production is known as

Due to relative motion of observer and the frame of reference of events, time always:

When a platinum wire is heated, it appears white at

The energy of a photon is represented by

Wave nature of particle was proposed by

The special theory of relativity is based on the

Compton shift refers to:

Compton was awarded Nobel prize in physics in

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

The concept of direction and position are purely

The special theory of relativity is based on:

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

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

The special theory of relatively treats the problems involving:

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

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

At the temperature, a body emits radiation which is principally

The year when A.H. compton was awarded Nobel Prize is:

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Practically the quantity v/c is always:

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