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	From the theory of relativity, momentum p of the photon is related to energy as	A. p = hfc B. p = hf/c C. p = f(hc,f) D. p = cf/h
2	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
3	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
4	The mass of an object will be doubled at speed	A. 1.6 x 10⁸ms^-1 B. 2.6 X 10⁸ms^-1 C. 2.6 x 10⁷ms^-1 D. 2.6 x 10⁹ms^-1
5	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
6	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
7	The existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
8	The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is	A. 100 ev B. 10⁶e v C. 10³e v D. 1.0 e 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	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson

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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

Due to relative motion of observer and the frame of reference of events, time always:

the symbol to be used in relativity problems denotes:

The concept of direction is purely:

Compton was awarded Nobel prize in physics 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

The energy of a photon is represented by

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

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

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

The value of the Stephen's constant for black body radiations is given by

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Absolute motion cannot be detected

Which of the following is not an example of intertial frame

The Stephen-Boltzmann law for the black body radiation is given by

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

Wave nature of particle was proposed by

Photoelectrons are emitted when ultraviolet light falls on:

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

At the temperature, a body emits radiation which is principally

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

Photocell is a device which converts

Compton shift refers to:

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

Which one of the following physical quantities changes with relativistic speed

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

The idea of quantization of energy was proposed by:

Newton's law of motion do not hold in

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

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

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ECAT Physics Chapter 19 Important MCQ's

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