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 value of the Stephen's constant for black body radiations is given by	A. 5.6 x 10⁸Wm^-2K^-4 B. 5.67 x 10^-8Wm^-2K^-4 C. 2.9 x 10^-3mK D. 2.9 x 10³mK
2	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
3	The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:	A. Lummer B. Planck C. Pringsheim D. Both (A ) and (B)
4	According to the de-Brogile relation, an object of large mass and ordinary speed has	A. very small wavelength B. very large wavelength C. very small frequency D. all of these
5	Max plank received the Nobel Prize in physics for his discovery of energy quanta in	A. 1900 B. 1906 C. 1912 D. 1918
6	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always
7	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
8	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C
9	Due to relative motion of observer and the frame of reference of events, time always:	A. Dilates itself B. Contracts itself C. Stretches itself D. Both (A) and (C)
10	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

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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 ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Strictly speaking, the earth is:

When a position comes close to an electron they annihilate into

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

An inertial frame is that frame in which

Which of the following phenomenon proves the particle nature of light

A black body is

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

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

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

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

When low energy photon interact with a metal,which of the following effect is likely to be taken place

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

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

The positron was discovered by:

The energy of photon 'E' is proported to

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

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

According to the de-Brogile relation, an object of large mass and ordinary speed has

The length contraction happens only

According to the special theory of relativity, time is

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

Newton's law of motion do not hold in

The energy of the 4th orbit in hydrogen atom is

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

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

The existence of position was predicted by Dirace in

Wien's constant is measured in:

Intensity of light determines the:

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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

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