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	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
2	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
3	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
4	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
5	A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is	A. 1.66 m B. 1.66 x 10^-10m C. 1.66 x 10^-29cm D. 1.66 x 10^-29m
6	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
7	the dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
8	Due to relative motion of observer and the frame of reference of events, time always:	A. Dilates itself B. Contracts itself C. Stretches itself D. Both (A) and (C)
9	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always
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

A black body is

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

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

The positron was discovered by:

In the compton's effect, it is found that the wavelength of incident x-rays is

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

The existence of position was predicted by Dirace in

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

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

According to the special theory of relativity, a moving clock

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

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

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

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

Compton shift refers to:

Position was discovered by Carl Anderson in

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

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

According to the special theory of relativity, time is

The energy of the 4th orbit in hydrogen atom is

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

A photon is considered to have

An inertial frame is that frame in which

S.I. unit of planks constant is

Momentum is a parameter associated with

Which one of the following physical quantities changes with relativistic speed

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

Intensity of light determines the:

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

The special theory of relativity treats problems invoving

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ECAT Physics Chapter 19 Important MCQ's

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