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

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khadim Hussain 03 - Mar - 2021 10 Min 50 Sec 75/120
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Ali ahmad 19 - Jul - 2018 09 Min 44 Sec 70/120
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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	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate
2	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
3	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
4	The energy of photon 'E' is proported to	A. The magnetic field H B. The electric field E C. Both the electric and magnetic field H and E D. Frequency
5	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
6	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²
7	The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:	A. Wien's constant B. Stefen's constnat C. Planck's constant D. Boltzmann's constant
8	The Einstein's changes in length, mass and time are not observed in common life because	A. We dont observer then seriously B. The masses are too large C. Their speed is too small than the speed of right D. All of the above
9	Strictly speaking, the earth is:	A. An accelerated frame of reference B. A non-inertial frame of reference C. An inertial frame of reference D. ^{A non-accelerated frame of reference}
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

Pair production is the phenomenon in which

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

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

If a body reaches a speed equal to the speed of light, then its mass will became

the symbol to be used in relativity problems denotes:

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

The unit of work function is:

Practically the quantity v/c is always:

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

There is no way to detect:

The concept of direction is purely:

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

A black body is

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

de-Broglies hypthesis was experimentally verified by

The Einstein's changes in length, mass and time are not observed in common life because

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

Wave nature of particle was proposed by

In the compton's effect, it is found that the wavelength of incident x-rays is

When a platinum wire is heated, it appears yellow at

Compton was awarded Nobel prize in physics in

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Compton shift refers to:

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

The energy of photon 'E' is proported to

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

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

Photocell is a device which converts

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

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

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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: