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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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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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	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
2	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
3	The mass of an object will be doubled at speed	A. 1.6 x 10⁸ms^-1 B. 2.6 X 10⁸ms^-1 C. 2.6 x 10⁷ms^-1 D. 2.6 x 10⁹ms^-1
4	The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:	A. Lummer B. Planck C. Pringsheim 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	According to the special theory of relativity, a moving clock	A. runs faster B. runs slower C. neither runs faster nor slower D. all of these
7	If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be	A. 2.120°A B. 0.212°A C. 21.2°A D. 0.14° a
8	A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is	A. 1.66 m B. 1.0 m C. 0.66 m D. 2.66 m
9	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
10	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²

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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

The value of threshold frequency for different metals is

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Compton was awarded Nobel prize in physics in

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

The special theory of relativity is based on:

Absolute motion cannot be detected

The special theory of relativity is based on the

Electromagnetic radiation or photons interact with matter in

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

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

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

In photoelectric effect the energy of ejected electrons depend on

When a platinum wire is heated, it appears white at

The way through which electromagnetic radiations or photons interact with matter depends upon their:

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

The mass of an object will be doubled at speed

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

An intertial frame of reference is a frame of reference which is

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

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

The general theory of relativity treats problems involving

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

the symbol to be used in relativity problems denotes:

According to the de-Brogile relation, an object of large mass and ordinary speed has

Victor de-Brogile received the Nobel prize in physics in

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

When a position comes close to an electron they annihilate into

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

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

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

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