ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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Ziyad Rehman Sheikh 16 - Nov - 2022 07 Min 21 Sec 40/120
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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	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
2	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
3	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
4	The mass of an object will be doubled at speed	A. 1.6 x 10⁸ms^-1 B. 2.6 X 10⁸ms^-1 C. 2.6 x 10⁷ms^-1 D. 2.6 x 10⁹ms^-1
5	When low energy photon interact with a metal,which of the following effect is likely to be taken place	A. pair production B. photoelectric C. Compton effect D. None of these
6	Compton shift refers to:	A. Photon B. Meson C. Proton D. Positron
7	According to the de-Brogile relation, an object of large mass and ordinary speed has	A. very small wavelength B. very large wavelength C. very small frequency D. all of these
8	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
9	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
10	The special theory of relatively treats the problems involving:	A. Inertial frames of reference B. Non-inertial frames C. Non-accelerated frame D. Botha (A) and (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

S.I. unit of planks constant is

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

Electromagnetic -radiation means:

Photoelectric effect takes place with a photon of:

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

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

The energy of photon 'E' is proported to

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:

The concept of direction is purely:

Compton was awarded Nobel prize in physics in

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

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

the dilation of time applies to the timing processes which are:

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

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

According to the Max plank, energy is redialed or absorbed in

When a platinum wire is heated, it appears orange red at

The inside cavity of the black body is

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

When a platinum wire is heated, it appears white at

Photocell is a device which converts

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

0.1 kg mass will be equivalent to the energy

Photoelectrons are emitted when ultraviolet light falls on:

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

Pair production is the phenomenon in which

The idea of quantization of energy was proposed by:

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

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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ECAT Physics Chapter 19 Important MCQ's

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