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 positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
2	The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is	A. 100 J B. 1.6 x 10^-17J C. 100 eV D. 1.6 x 10^-17eV
3	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
4	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
5	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
6	According to the special theory of relativity	A. mass and energy are same entities B. mass and energy are same entities but interconverible C. mass and energy are different entities but interconverible D. mass and energy are different entities but non-interconveritble
7	In order to produce pair production, a photon must have a energy	A. 0.511 Me v B. 0.256 Me v C. 1.02 Me v D. 0.956 Me v
8	As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:	A. Smaller B. Lerger C. Same D. Much larger
9	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
10	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer

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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 special theory of relatively treats the problems involving:

An inertial frame is that frame in which

When platinum wire is heated, it appears cherry red at

Photoelectric effect takes place with a photon of:

Compton was awarded Nobel prize in physics in

The concept of direction is purely:

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

According to the de-Brogile relation, an object of large mass and ordinary speed has

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

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

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

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

When a position comes close to an electron they annihilate into

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Davision and Germer performed experiment to verify

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

Intensity of light determines the:

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

The inside cavity of the black body is

The idea of quantization of energy was proposed by:

The positron was discovered by:

Momentum is a parameter associated with

The energy of the 4th orbit in hydrogen atom is

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

Which one of the following physical quantities changes with relativistic speed

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

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

From the theory of relativity, momentum p of the photon is related to energy as

Victor de-Brogile received the Nobel prize in physics 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: