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

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ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	Intensity of light determines the:	A. Energy of each photon B. Number of photons C. Speed of photons D. Size of photons
2	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
3	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
4	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
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	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
7	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
8	The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes	A. 2 mo B. 1.67 mo C. 0.67 mo D. 2.67 mo
9	Max plank received the Nobel Prize in physics for his discovery of energy quanta in	A. 1900 B. 1906 C. 1912 D. 1918
10	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

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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

Max Planck received the Nobel Prize for his discovery of energy quants in:

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

The existence of position was predicted by Dirace in

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

According to the special theory of relativity

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

de-Broglies hypthesis was experimentally verified by

The photon of radio-waves has energy of about

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

The special theory of relativity is based on the

Practically the quantity v/c is always:

S.I. unit of planks constant is

The unit of work function is:

Compton studied the scattering of x-rays by loosely bound electrons from:

In order to produce pair production, a photon must have a energy

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

The value of threshold frequency for different metals is

The inside cavity of the black body is

A photon is considered to have

Wien's constant is measured in:

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

When a platinum wire is heated, it appears white at

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

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

Pair production is the phenomenon in which

Which one of the following physical quantities changes with relativistic speed

Compton was awarded Nobel prize in physics in

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Photoelectrons are emitted when ultraviolet light falls on:

The length contraction happens only

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