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	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
2	Newton's law of motion do not hold in	A. an accelerated frame of reference B. an unaccelerated frame of reference C. both of these D. none of these
3	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
4	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal
5	Max plank received the Nobel Prize in physics for his discovery of energy quanta in	A. 1900 B. 1906 C. 1912 D. 1918
6	If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be	A. 2.120°A B. 0.212°A C. 21.2°A D. 0.14° a
7	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
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 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
10	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}

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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 nature of radiations emitted by a hot body depends upon its:

de-Broglies hypthesis was experimentally verified by

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

Momentum is a parameter associated with

According to the special theory of relativity, time is

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

Photoelectrons are emitted when ultraviolet light falls on:

The energy of a photon is represented by

When platinum wire is heated, it appears cherry red at

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

The special theory of relativity is based on:

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

When a platinum wire is heated, it appears yellow at

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

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

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

Photocell is a device which converts

The photon of radio-waves has energy of about

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

According to the special theory of relativity

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

The length contraction happens only

The concept of direction and position are purely

When a platinum wire is heated, it appears white at

Electromagnetic radiation or photons interact with matter in

The mass of an object will be doubled at speed

An inertial frame is that frame in which

Max Planck received the Nobel Prize for his discovery of energy quants in:

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

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

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ECAT Physics Chapter 19 Important MCQ's

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