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	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
2	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
3	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
4	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
5	In process of annihilation of matter, the two photons produced move in opposite direction to converse	A. momentum B. charge C. energy D. mass
6	The emission of electrons from a metal surface when exposed to light of suitable frequency is called the	A. pair production B. Compton effect C. photoelectric effect D. relativity
7	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
8	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
9	The concept of direction and position are purely	A. absolute B. relative C. absolute or relative D. none of these
10	G.P. Thomson observer experimentally that electrons and neutrons possess	A. particle-like properties B. wave-like properties C. neither particle nor wave like properties 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 Nobel Prize on the explanation of photoelectric effect was awarded to:

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

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

Electromagnetic radiation or photons interact with matter in

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

A black body is

Compton studied the scattering of x-rays by loosely bound electrons from:

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

When platinum wire is heated, it appears cherry red at

de-Broglies hypthesis was experimentally verified by

Wave nature of particle was proposed by

When a platinum wire is heated, it appears yellow at

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

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

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

The concept of direction is purely:

Converse of pair production is known as

According to the special theory of relativity, time is

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

The existence of position was predicted by Dirace in

Which one of the following physical quantities changes with relativistic speed

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

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

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

Practically the quantity v/c is always:

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

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

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

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

Wien's constant is measured in:

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ECAT Physics Chapter 19 Important MCQ's

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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes: