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	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
2	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
3	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
4	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
5	According to the special theory of relativity, a moving clock	A. runs faster B. runs slower C. neither runs faster nor slower D. all of these
6	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
7	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
8	The value of the plank's constant 'h' is given by	A. 1.6 x 10^-19J B. 1.67 x 10^-27Kg C. 6.63 x 10³⁴Js D. 6.63 x 10^-34Js
9	Which of the following is not an example of intertial frame	A. a body placed on the surface of earth B. a body placed in a car moving with uniform velocity C. a body placed in a car moving with same acceleration D. none of these
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

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

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

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

The mass of an object will be doubled at speed

The unit of work function is:

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

The special theory of relativity is based on:

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Practically the quantity v/c is always:

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

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

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

According to the special theory of relativity, time is

The idea of quantization of energy was proposed by:

The inside cavity of the black body is

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

When platinum wire is heated, it appears cherry red at

If a material object moves with the speed of light 'C' its mass becomes

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

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

When a platinum wire is heated, it appears white at

A photon is considered to have

The existence of position was predicted by Dirace in

Wien's constant is measured in:

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

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

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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

Newton's law of motion do not hold in

An inertial frame is that frame in which

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ECAT Physics Chapter 19 Important MCQ's

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