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

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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 inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
2	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
3	the dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
4	The length contraction happens only	A. Opposite to the direction of motion B. along the direction of motion C. perpendicular to the direction of motion D. In any direction
5	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
6	According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body	A. Remains constant B. Decreases C. Increases to infinity D. Reduced to zero
7	Position was discovered by Carl Anderson in	A. 1920 B. 1925 C. 1928 D. 1932
8	The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as	A. classical mechanics B. Newtonian mechanics C. quantum mechanics D. statistical mechanics
9	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
10	The Einstein's changes in length, mass and time are not observed in common life because	A. We dont observer then seriously B. The masses are too large C. Their speed is too small than the speed of right D. All of the above

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

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

The existence of position was predicted by Dirace in

When a position comes close to an electron they annihilate into

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

The positron was discovered by:

Wien's constant is measured in:

According to the special theory of relativity, a moving clock

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

In photoelectric effect the energy of ejected electrons depend on

The length contraction happens only

Which one of the following physical quantities changes with relativistic speed

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

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

As the light shines on the metal surface, the electrons are ejected

Compton shift refers to:

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

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

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

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

When a platinum wire is heated, it appears white at

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

The concept of direction is purely:

The unit of work function is:

Compton was awarded Nobel prize in physics in

When a platinum wire is heated, it appears yellow at

The photon of radio-waves has energy of about

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Position was discovered by Carl Anderson in

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ECAT Physics Chapter 19 Important MCQ's

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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes: