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

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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	Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as	A. ON switch B. off switch C. function switch D. none of these
2	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
3	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
4	When a high energy photon interact with a metal, which of the following effect is most likely to be taken place	A. pair production B. photoelectric effect C. Compton effect D. None of these
5	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:	A. Smaller B. Lerger C. Same D. Much larger
6	The positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
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	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
9	From the theory of relativity, momentum p of the photon is related to energy as	A. p = hfc B. p = hf/c C. p = f(hc,f) D. p = cf/h
10	The general theory of relativity treats problems involving	A. inertial frame of references B. accelerating frame of references C. both of these D. none of these

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

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

Newton's law of motion do not hold in

According to the special theory of relativity, a moving clock

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

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

The photoelectric effect, the maximum energy of photoelectrons depends on the

The Stephen-Boltzmann law for the black body radiation is given by

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

At the temperature, a body emits radiation which is principally

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

Wave nature of particle was proposed by

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

A photon is considered to have

Compton shift refers to:

The special theory of relatively treats the problems involving:

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

When a platinum wire is heated, it appears orange red at

de-Broglies hypthesis was experimentally verified by

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

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

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

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

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

Photocell is a device which converts

The special theory of relativity is based on:

The general theory of relativity treats problems involving

There is no way to detect:

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

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

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