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	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
2	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:	A. Smaller B. Lerger C. Same D. Much larger
3	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
4	With the help of 50 K v electron microscope, a resolution of	A. 0.5 to 1 m to possible B. 1 m to 10 m is possible C. 0.5 to 1 nm is possible D. 1 to 10 nm is possible
5	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
6	Max Planck received the Nobel Prize for his discovery of energy quants in:	A. 1718 AD B. 1918 AH C. 1818 AD D. 1918 AD
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	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
9	If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be	A. 2.120°A B. 0.212°A C. 21.2°A D. 0.14° a
10	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴

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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

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

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

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

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

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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

S.I. unit of planks constant is

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

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

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

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

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

The special theory of relatively treats the problems involving:

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

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

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

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

Intensity of light determines the:

In photoelectric effect the energy of ejected electrons depend on

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

The inside cavity of the black body is

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

A photon is considered to have

When a platinum wire is heated, it appears yellow at

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

When a platinum wire is heated, it appears white at

The energy of a photon is represented by

An inertial frame is that frame in which

Photocell is a device which converts

Absolute motion cannot be detected

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