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

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

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Asghar Ali 03 - Mar - 2021 10 Min 50 Sec 100/120
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shamsuddin 19 - Aug - 2021 10 Min 50 Sec 75/120
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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	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
2	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
3	The general theory of relativity treats problems involving	A. inertial frame of references B. accelerating frame of references C. both of these D. none of these
4	G.P. Thomson observer experimentally that electrons and neutrons possess	A. particle-like properties B. wave-like properties C. neither particle nor wave like properties D. none of these
5	The mass of an object will be doubled at speed	A. 1.6 x 10⁸ms^-1 B. 2.6 X 10⁸ms^-1 C. 2.6 x 10⁷ms^-1 D. 2.6 x 10⁹ms^-1
6	The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:	A. Lummer B. Planck C. Pringsheim D. Both (A ) and (B)
7	A high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one of them
8	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
9	From the theory of relativity, momentum p of the photon is related to energy as	A. p = hfc B. p = hf/c C. p = f(hc,f) D. p = cf/h
10	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)

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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

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

The positron was discovered by:

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

When a platinum wire is heated, it appears yellow at

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

According to the special theory of relativity, a moving clock

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

The energy of the 4th orbit in hydrogen atom is

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

the symbol to be used in relativity problems denotes:

Strictly speaking, the earth is:

According to the Max plank, energy is redialed or absorbed in

Position was discovered by Carl Anderson in

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

Photoelectric effect takes place with a photon of:

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

Intensity of light determines the:

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

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

According to the de-Brogile relation, an object of large mass and ordinary speed has

A photon is considered to have

Wave nature of particle was proposed by

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

The energy of photon 'E' is proported to

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

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

According to the special theory of relativity, time is

A black body is

Absolute motion cannot be detected

The special theory of relativity is based on:

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