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	When a high energy photon interact with a metal, which of the following effect is most likely to be taken place	A. pair production B. photoelectric effect C. Compton effect D. None of these
2	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
3	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal
4	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
5	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
6	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
7	Intensity of light determines the:	A. Energy of each photon B. Number of photons C. Speed of photons D. Size of photons
8	The Nobel Prize on the explanation of photoelectric effect was awarded to:	A. Max. Planck B. Maxwell C. Bohr D. Rutherford
9	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
10	If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be	A. 2.120°A B. 0.212°A C. 21.2°A D. 0.14° a

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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 energy of a photon is represented by

There is no way to detect:

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

Absolute motion cannot be detected

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

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Photoelectrons are emitted when ultraviolet light falls on:

The special theory of relatively treats the problems involving:

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

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

The unit of work function is:

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

An inertial frame is that frame in which

Which of the following is not an example of intertial frame

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

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

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

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

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

According to the special theory of relativity

Pair production is the phenomenon in which

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

The value of the plank's constant 'h' is given by

Momentum is a parameter associated with

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

The concept of direction is purely:

When a platinum wire is heated, it appears white at

Electromagnetic -radiation means:

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