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	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
2	According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the	A. number of photoelectrons B. size of the photoelectrons C. charge on photoelectrons D. K.E of photoelectrons
3	When a position comes close to an electron they annihilate into photons such that	A. each photon has energy 0.51 Me v B. each photon has energy 1.02 Me v C. each photon has energy 0.25 Me v D. none of these
4	Compton shift refers to:	A. Photon B. Meson C. Proton D. Positron
5	Pair production is the phenomenon in which	A. matter is converted into energy B. energy is converted into matter C. light is converted into electrical energy D. electrical energy is converted into light
6	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
7	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
8	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
9	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
10	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

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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 way through which electromagnetic radiations or photons interact with matter depends upon their:

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

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

The idea of quantization of energy was proposed by:

In photoelectric effect the energy of ejected electrons depend on

Photoelectrons are emitted when ultraviolet light falls on:

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

Pair production is the phenomenon in which

An inertial frame is that frame in which

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

When a position comes close to an electron they annihilate into

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

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

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

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

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

0.1 kg mass will be equivalent to the energy

The concept of direction and position are purely

Practically the quantity v/c is always:

Electromagnetic radiation or photons interact with matter in

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

If a body reaches a speed equal to the speed of light, then its mass will became

Absolute motion cannot be detected

When a platinum wire is heated, it appears yellow at

Wave nature of particle was proposed by

An intertial frame of reference is a frame of reference which is

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

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

Position was discovered by Carl Anderson in

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

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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: