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	According to Einstein, with the great increase in the speed of the body the relativistic length of the body	A. Remains constant B. Decreases C. Increases D. Reduces to zero
2	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
3	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
4	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
5	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
6	Strictly speaking, the earth is:	A. An accelerated frame of reference B. A non-inertial frame of reference C. An inertial frame of reference D. ^{A non-accelerated frame of reference}
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	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
9	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
10	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well

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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

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

The value of threshold frequency for different metals is

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

Wave nature of particle was proposed by

Photoelectric effect takes place with a photon of:

Electromagnetic -radiation means:

Newton's law of motion do not hold in

Position was discovered by Carl Anderson in

Intensity of light determines the:

When a platinum wire is heated, it appears dull red at about

Momentum is a parameter associated with

The existence of position was predicted by Dirace in

The photon of radio-waves has energy of about

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

An inertial frame is that frame in which

A photon is considered to have

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

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

Pair production is the phenomenon in which

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

Photoelectrons are emitted when ultraviolet light falls on:

When platinum wire is heated, it appears cherry red at

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Strictly speaking, the earth is:

A black body is

There is no way to detect:

Electromagnetic radiation or photons interact with matter in

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

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

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

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ECAT Physics Chapter 19 Important MCQ's

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