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	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. larger B. shorter C. equal D. none of these
2	Intensity of light determines the:	A. Energy of each photon B. Number of photons C. Speed of photons D. Size of photons
3	The existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
4	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
5	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates
6	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
7	An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is	A. 1.66 x 10^-29m B. 1.74 x 10^-10cm C. 17.4 x 10^-6m D. 1.74 x 10^-10m
8	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
9	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C
10	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature

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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

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

Practically the quantity v/c is always:

The Stephen-Boltzmann law for the black body radiation is given by

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

Which one of the following physical quantities changes with relativistic speed

The general theory of relativity treats problems involving

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

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

Absolute motion cannot be detected

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

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

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

Compton shift refers to:

S.I. unit of planks constant is

When a platinum wire is heated, it appears dull red at about

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Newton's law of motion do not hold in

When a platinum wire is heated, it appears white at

The unit of work function is:

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

When platinum wire is heated, it appears cherry red at

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

Victor de-Brogile received the Nobel prize in physics in

In the compton's effect, it is found that the wavelength of incident x-rays is

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

Which of the following phenomenon proves the particle nature of light

Electromagnetic -radiation means:

The concept of direction and position are purely

The nature of radiations emitted by a hot body depends upon its:

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ECAT Physics Chapter 19 Important MCQ's

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The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be