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	If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:	A. Newton B. Joule C. Joule-Sec D. Joule-s^-1
2	Which of the following is not an example of intertial frame	A. a body placed on the surface of earth B. a body placed in a car moving with uniform velocity C. a body placed in a car moving with same acceleration D. none of these
3	If a material object moves with the speed of light 'C' its mass becomes	A. Equal to its rest mass B. Four times of its rest mass C. Double of its rest mass D. Infinite
4	When low energy photon interact with a metal,which of the following effect is likely to be taken place	A. pair production B. photoelectric C. Compton effect D. None of these
5	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
6	A non-inertial frame of reference is one, in which	A. law of inertial is valid B. all laws of physics are the same in all frames C. a>0 or a<0 D. a=0
7	The value of the plank's constant 'h' is given by	A. 1.6 x 10^-19J B. 1.67 x 10^-27Kg C. 6.63 x 10³⁴Js D. 6.63 x 10^-34Js
8	Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of	A. photoelectric effect B. pair production C. Compton effect D. uncertainty principle
9	The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of	A. 2 cm/s B. 20 cm/s C. 200 cm/s D. 2000 cm/s
10	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways

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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 Nobel Prize on the explanation of photoelectric effect was awarded to:

The concept of direction is purely:

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

The energy of photon 'E' is proported to

Pair production is the phenomenon in which

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

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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

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

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:

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

Which of the following phenomenon proves the particle nature of light

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

Compton was awarded Nobel prize in physics in

The value of threshold frequency for different metals is

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

In order to produce pair production, a photon must have a energy

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

Newton's law of motion do not hold in

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

Strictly speaking, the earth is:

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

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

the dilation of time applies to the timing processes which are:

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

Practically the quantity v/c is always:

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

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

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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