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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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	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
2	Due to relative motion of observer and the frame of reference of events, time always:	A. Dilates itself B. Contracts itself C. Stretches itself D. Both (A) and (C)
3	The value of threshold frequency for different metals is	A. different B. same C. may be different or may be same D. none of these
4	The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be	A. 500 m B. 500 nm C. 500 km D. 500 cm
5	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
6	When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called	A. thermoionic electrons B. free electrons C. photoelectrons D. slow electrons
7	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
8	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
9	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
10	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates

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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

Newton's law of motion do not hold in

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Wave nature of particle was proposed by

The energy of a photon is represented by

The nature of radiations emitted by a hot body depends upon its:

As the light shines on the metal surface, the electrons are ejected

de-Broglies hypthesis was experimentally verified by

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

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

A photon is considered to have

Momentum is a parameter associated with

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Compton was awarded Nobel prize in physics in

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

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

The mass of an object will be doubled at speed

The idea of quantization of energy was proposed by:

The concept of direction is purely:

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

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

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

A black body is

Electromagnetic radiation or photons interact with matter in

S.I. unit of planks constant is

The special theory of relatively treats the problems involving:

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

The special theory of relativity is based on:

The value of threshold frequency for different metals is

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

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