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 bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is	A. 1.66 m B. 1.0 m C. 0.66 m D. 2.66 m
2	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these
3	Compton derived an expression to find compton shift by applying to the process, the law of conservation of:	A. Energy only B. Momentum only C. Mass only D. Charge only
4	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
5	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
6	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
7	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
8	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
9	A high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one of them
10	When low energy photon interact with a metal,which of the following effect is likely to be taken place	A. pair production B. photoelectric C. Compton effect 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

The concept of direction is purely:

Intensity of light determines the:

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

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

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:

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

According to the de-Brogile relation, an object of large mass and ordinary speed has

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

The existence of position was predicted by Dirace in

The concept of direction and position are purely

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

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

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

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

The value of threshold frequency for different metals is

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Position was discovered by Carl Anderson in

The energy of photon 'E' is proported to

Momentum is a parameter associated with

The energy of the 4th orbit in hydrogen atom is

The photon of radio-waves has energy of about

Photoelectrons are emitted when ultraviolet light falls on:

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

A particle having mass and charge equal to that of an electron is called:

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

When the atomic particle are moving with velocities approaching that of light:

A black body is

An inertial frame is that frame in which

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

When a platinum wire is heated, it appears white at

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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