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

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Asghar Ali 03 - Mar - 2021 10 Min 50 Sec 100/120
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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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Aarij 08 - Dec - 2024 02 Min 25 Sec 65/120
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Waleed Ahmed 26 - Feb - 2023 10 Min 00 Sec 65/120
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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	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
2	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}
3	An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is	A. 1.66 x 10^-29m B. 1.74 x 10^-10cm C. 17.4 x 10^-6m D. 1.74 x 10^-10m
4	The existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
5	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
6	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
7	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
8	If a body reaches a speed equal to the speed of light, then its mass will became	A. zero B. very small C. infinity D. none of these
9	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
10	The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum	A. 2.9 s B. 3.0 s C. 6.6 s D. 9.6 s

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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

Photoelectric effect takes place with a photon of:

Photoelectrons are emitted when ultraviolet light falls on:

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

Electromagnetic radiation or photons interact with matter in

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

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

Wien's constant is measured in:

When the atomic particle are moving with velocities approaching that of light:

When platinum wire is heated, it appears cherry red at

The special theory of relativity is based on:

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

Victor de-Brogile received the Nobel prize in physics in

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

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

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

Electromagnetic -radiation means:

A black body is

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

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

Newton's law of motion do not hold in

A non-inertial frame of reference is one, in which

The energy of a photon is represented by

The Nobel Prize on the explanation of photoelectric effect was awarded to:

The unit of work function is:

Wave nature of particle was proposed by

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

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 idea of quantization of energy was proposed by:

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

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ECAT Physics Chapter 19 Important MCQ's

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