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	the dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
2	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
3	There is no way to detect:	A. Absolute uniform motion B. Accelerated motion C. State rest D. State of motion
4	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates
5	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
6	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
7	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
8	The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum	A. 2.9 s B. 3.0 s C. 6.6 s D. 9.6 s
9	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
10	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

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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

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

When a platinum wire is heated, it appears yellow at

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

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

Converse of pair production is known as

0.1 kg mass will be equivalent to the energy

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

Photoelectrons are emitted when ultraviolet light falls on:

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

Absolute motion cannot be detected

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

The general theory of relativity treats problems involving

The inside cavity of the black body is

In photoelectric effect the energy of ejected electrons depend on

Victor de-Brogile received the Nobel prize in physics in

According to the special theory of relativity, time is

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

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

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

According to the special theory of relativity

Wien's constant is measured in:

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:

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

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

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

There is no way to detect:

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

S.I. unit of planks constant is

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

The mass of an object will be doubled at speed

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ECAT Physics Chapter 19 Important MCQ's

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