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

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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	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
2	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
3	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
4	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
5	Compton derived an expression to find compton shift by applying to the process, the law of conservation of:	A. Energy only B. Momentum only C. Mass only D. Charge only
6	Victor de-Brogile received the Nobel prize in physics in	A. 1925 B. 1929 C. 1932 D. 1935
7	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
8	When the atomic particle are moving with velocities approaching that of light:	A. Newton's laws become valid B. Relativistic effects become prominent C. Botha(A) and (B) are valid D. Neither (A)nor (B)
9	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
10	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these

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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

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

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

When a platinum wire is heated, it appears yellow at

The special theory of relativity is based on the

The positron was discovered by:

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

Strictly speaking, the earth is:

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

According to the special theory of relativity

The special theory of relativity treats problems invoving

de-Broglies hypthesis was experimentally verified by

From the theory of relativity, momentum p of the photon is related to energy as

Which of the following is not an example of intertial frame

The idea of quantization of energy was proposed by:

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

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

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

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

0.1 kg mass will be equivalent to the energy

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

The Stephen-Boltzmann law for the black body radiation is given by

In photoelectric effect the energy of ejected electrons depend on

The energy of photon 'E' is proported to

Compton was awarded Nobel prize in physics in

the symbol to be used in relativity problems denotes:

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

According to the special theory of relativity, time is

When platinum wire is heated, it appears cherry red at

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

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

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ECAT Physics Chapter 19 Important MCQ's

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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes: