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

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Asghar Ali 03 - Mar - 2021 10 Min 50 Sec 100/120
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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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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	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
2	Position was discovered by Carl Anderson in	A. 1920 B. 1925 C. 1928 D. 1932
3	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
4	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
5	There is no way to detect:	A. Absolute uniform motion B. Accelerated motion C. State rest D. State of motion
6	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
7	Compton derived an expression to find compton shift by applying to the process, the law of conservation of:	A. Energy only B. Momentum only C. Mass only D. Charge only
8	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
9	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
10	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²

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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

An inertial frame is that frame in which

The Einstein's changes in length, mass and time are not observed in common life because

Absolute motion cannot be detected

Wien's constant is measured in:

The length contraction happens only

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

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

The general theory of relativity treats problems involving

Photoelectrons are emitted when ultraviolet light falls on:

The special theory of relativity treats problems invoving

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

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

Newton's law of motion do not hold in

The mass of an object will be doubled at speed

Pair production is the phenomenon in which

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

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

When platinum wire is heated, it appears cherry red at

If a body reaches a speed equal to the speed of light, then its mass will became

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

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

Momentum is a parameter associated with

Which of the following is not an example of intertial frame

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

The energy of the 4th orbit in hydrogen atom is

The concept of direction is purely:

Position was discovered by Carl Anderson in

Photoelectric effect takes place with a photon of:

The special theory of relativity is based on the

de-Broglies hypthesis was experimentally verified by

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

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