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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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	The length contraction happens only	A. Opposite to the direction of motion B. along the direction of motion C. perpendicular to the direction of motion D. In any direction
2	The special theory of relativity treats problems invoving	A. inertial frame of references B. accelerating frame of references C. both of these D. none of these
3	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
4	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
5	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
6	In process of annihilation of matter, the two photons produced move in opposite direction to converse	A. momentum B. charge C. energy D. mass
7	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
8	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
9	There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as	A. maximum frequency B. minimum frequency C. threshold frequency D. all of these
10	In the compton's effect, it is found that the wavelength of incident x-rays is	A. greater than the wavelength of scattered x-rays B. equal to the wavelength of scattered x-rays C. less than the wavelength of scattered x-rays D. any one 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

The special theory of relativity is based on:

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

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

The positron was discovered by:

Converse of pair production is known as

Photocell is a device which converts

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

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

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

S.I. unit of planks constant is

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

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

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

Newton's law of motion do not hold in

Compton was awarded Nobel prize in physics in

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

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

0.1 kg mass will be equivalent to the energy

According to the special theory of relativity, a moving clock

Intensity of light determines the:

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

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

When platinum wire is heated, it appears cherry red at

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

The inside cavity of the black body is

Absolute motion cannot be detected

Wave nature of particle was proposed by

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

If a material object moves with the speed of light 'C' its mass becomes

Which one of the following physical quantities changes with relativistic speed

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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: