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 the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
2	A non-inertial frame of reference is one, in which	A. law of inertial is valid B. all laws of physics are the same in all frames C. a>0 or a<0 D. a=0
3	According to the Max plank, energy is redialed or absorbed in	A. discrete packets B. continuous waves C. either of them D. none of these
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 existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
6	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
7	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
8	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
9	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules
10	When platinum wire is heated, it appears cherry red at	A. 1600°C B. 900°C C. 1100°C D. 1300°C

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

Photoelectric effect takes place with a photon of:

Which one of the following physical quantities changes with relativistic speed

The energy of photon 'E' is proported to

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

Absolute motion cannot be detected

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

the symbol to be used in relativity problems denotes:

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

Compton shift refers to:

Newton's law of motion do not hold in

The special theory of relatively treats the problems involving:

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

Wien's constant is measured in:

According to the special theory of relativity

The concept of direction is purely:

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

The mass of an object will be doubled at speed

At the temperature, a body emits radiation which is principally

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

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

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Which of the following is not an example of intertial frame

With the help of 50 K v electron microscope, a resolution of

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

The existence of position was predicted by Dirace in

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

When a position comes close to an electron they annihilate into photons such that

A black body is

Momentum is a parameter associated with

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ECAT Physics Chapter 19 Important MCQ's

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