ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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Ali ahmad 19 - Jul - 2018 09 Min 44 Sec 70/120
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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	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
2	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
3	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
4	If a body reaches a speed equal to the speed of light, then its mass will became	A. zero B. very small C. infinity D. none of these
5	When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called	A. thermoionic electrons B. free electrons C. photoelectrons D. slow electrons
6	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
7	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
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	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
10	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red

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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 mass of an object will be doubled at speed

Photocell is a device which converts

Wave nature of particle was proposed by

Which one of the following physical quantities changes with relativistic speed

The existence of position was predicted by Dirace in

A non-inertial frame of reference is one, in which

the symbol to be used in relativity problems denotes:

The positron was discovered by:

Converse of pair production is known as

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

Strictly speaking, the earth is:

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

Photoelectric effect takes place with a photon of:

Which of the following is not an example of intertial frame

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

According to the special theory of relativity, a moving clock

The concept of direction is purely:

A black body is

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

The special theory of relativity is based on:

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

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

Davision and Germer performed experiment to verify

When a platinum wire is heated, it appears white at

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

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

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

There is no way to detect:

Momentum is a parameter associated with

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

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