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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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	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
2	According to the special theory of relativity	A. mass and energy are same entities B. mass and energy are same entities but interconverible C. mass and energy are different entities but interconverible D. mass and energy are different entities but non-interconveritble
3	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
4	The value of threshold frequency for different metals is	A. different B. same C. may be different or may be same D. none of these
5	According to the Max plank, energy is redialed or absorbed in	A. discrete packets B. continuous waves C. either of them D. none of these
6	The emission of electrons from a metal surface when exposed to light of suitable frequency is called the	A. pair production B. Compton effect C. photoelectric effect D. relativity
7	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
8	The photoelectric effect, the maximum energy of photoelectrons depends on the	A. particular metal surface B. frequency of incident light C. both of them D. none of them
9	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
10	Max plank received the Nobel Prize in physics for his discovery of energy quanta in	A. 1900 B. 1906 C. 1912 D. 1918

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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

Victor de-Brogile received the Nobel prize in physics in

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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

Converse of pair production is known as

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

A photon is considered to have

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

The concept of direction and position are purely

The positron was discovered by:

The value of threshold frequency for different metals is

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

Momentum is a parameter associated with

At the temperature, a body emits radiation which is principally

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

There is no way to detect:

The value of the Stephen's constant for black body radiations is given by

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

Intensity of light determines the:

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

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

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

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

Position was discovered by Carl Anderson in

Compton shift refers to:

Electromagnetic -radiation means:

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:

The special theory of relativity is based on:

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

The Einstein's changes in length, mass and time are not observed in common life because

A particle having mass and charge equal to that of an electron is called:

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ECAT Physics Chapter 19 Important MCQ's

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