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

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ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always
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	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
4	The mass of an object will be doubled at speed	A. 1.6 x 10⁸ms^-1 B. 2.6 X 10⁸ms^-1 C. 2.6 x 10⁷ms^-1 D. 2.6 x 10⁹ms^-1
5	From the theory of relativity, momentum p of the photon is related to energy as	A. p = hfc B. p = hf/c C. p = f(hc,f) D. p = cf/h
6	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
7	In photoelectric effect the energy of ejected electrons depend on	A. The frequency B. The intensity C. Both frequency and intensity D. None of these
8	Davision and Germer performed experiment to verify	A. de-Brogile hypothesis B. theory of relativity C. Newton's law of gravitation D. Mass-energy relation
9	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
10	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these

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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

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

A photon is considered to have

Which of the following is not an example of intertial frame

Max Planck received the Nobel Prize for his discovery of energy quants in:

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

Electromagnetic -radiation means:

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

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

The energy of the 4th orbit in hydrogen atom is

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

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:

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

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

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

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

The special theory of relativity is based on the

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

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

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

When a position comes close to an electron they annihilate into

In photoelectric effect the energy of ejected electrons depend on

Momentum is a parameter associated with

Pair production is the phenomenon in which

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

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

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

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

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

The way through which electromagnetic radiations or photons interact with matter depends upon their:

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ECAT Physics Chapter 19 Important MCQ's

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