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	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}
2	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
3	A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is	A. 1.66 m B. 1.66 x 10^-10m C. 1.66 x 10^-29cm D. 1.66 x 10^-29m
4	At the temperature, a body emits radiation which is principally	A. of long wavelengths in the visible region B. of long wavelengths in the invisible infrared region C. of short wavelength in invisible ultraviolet region D. none of these
5	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
6	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
7	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always
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	The value of the plank's constant 'h' is given by	A. 1.6 x 10^-19J B. 1.67 x 10^-27Kg C. 6.63 x 10³⁴Js D. 6.63 x 10^-34Js
10	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

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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

Converse of pair production is known as

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

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

The special theory of relativity is based on:

The photoelectric effect, the maximum energy of photoelectrons depends on the

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

The positron was discovered by:

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

Position was discovered by Carl Anderson in

Davision and Germer performed experiment to verify

Absolute motion cannot be detected

The special theory of relativity treats problems invoving

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

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:

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

The value of the plank's constant 'h' is given by

When a platinum wire is heated, it appears yellow at

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

At the temperature, a body emits radiation which is principally

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Wien's constant is measured in:

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

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

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

The photon of radio-waves has energy of about

The energy of a photon is represented by

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

According to the special theory of relativity

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

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

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