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	In the compton's effect, it is found that the wavelength of incident x-rays is	A. greater than the wavelength of scattered x-rays B. equal to the wavelength of scattered x-rays C. less than the wavelength of scattered x-rays D. any one of these
2	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
3	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
4	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
5	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
6	If a material object moves with the speed of light 'C' its mass becomes	A. Equal to its rest mass B. Four times of its rest mass C. Double of its rest mass D. Infinite
7	There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as	A. maximum frequency B. minimum frequency C. threshold frequency D. all of these
8	The photon of radio-waves has energy of about	A. 1 Me V B. 1 Ke v C. 10^-10e v D. 10¹⁰e v
9	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
10	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons

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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

A photon is considered to have

The unit of work function is:

the dilation of time applies to the timing processes which are:

de-Broglies hypthesis was experimentally verified by

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

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

When a position comes close to an electron they annihilate into

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:

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Momentum is a parameter associated with

Converse of pair production is known as

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

According to the special theory of relativity, a moving clock

Photoelectric effect takes place with a photon of:

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

Photocell is a device which converts

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

As the light shines on the metal surface, the electrons are ejected

The general theory of relativity treats problems involving

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

0.1 kg mass will be equivalent to the energy

When a position comes close to an electron they annihilate into photons such that

Davision and Germer performed experiment to verify

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

The special theory of relativity treats problems invoving

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

Intensity of light determines the:

The special theory of relatively treats the problems involving:

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

S.I. unit of planks constant is

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ECAT Physics Chapter 19 Important MCQ's

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The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be

When platinum wire is heated, then at the temperature of 500 ^oC, it becomes: