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	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
2	The photoelectric effect, the maximum energy of photoelectrons depends on the	A. particular metal surface B. frequency of incident light C. both of them D. none of them
3	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
4	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
5	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
6	Pair production is the phenomenon in which	A. matter is converted into energy B. energy is converted into matter C. light is converted into electrical energy D. electrical energy is converted into light
7	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	A. 1.66 m B. 1.0 m C. 0.66 m D. 2.66 m
8	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
9	If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:	A. Newton B. Joule C. Joule-Sec D. Joule-s^-1
10	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²

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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

According to the special theory of relativity, a moving clock

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

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

There is no way to detect:

The photon of radio-waves has energy of about

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

Compton was awarded Nobel prize in physics in

Davision and Germer performed experiment to verify

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

Absolute motion cannot be detected

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

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

The value of threshold frequency for different metals is

The existence of position was predicted by Dirace in

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

When a platinum wire is heated, it appears white at

The special theory of relatively treats the problems involving:

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

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

With the help of 50 K v electron microscope, a resolution of

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

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

Electromagnetic -radiation means:

Wien's constant is measured in:

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

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

S.I. unit of planks constant is

A photon is considered to have

de-Broglies hypthesis was experimentally verified by

Practically the quantity v/c is always:

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Top Scorers Of ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQ`s Test

ECAT Physics Chapter 19 Important MCQ's

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The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be