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 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
2	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)
3	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
4	The concept of direction and position are purely	A. absolute B. relative C. absolute or relative D. none of these
5	Strictly speaking, the earth is:	A. An accelerated frame of reference B. A non-inertial frame of reference C. An inertial frame of reference D. ^{A non-accelerated frame of reference}
6	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
7	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always
8	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
9	The photon of radio-waves has energy of about	A. 1 Me V B. 1 Ke v C. 10^-10e v D. 10¹⁰e v
10	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

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

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

S.I. unit of planks constant is

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

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

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

The energy of the 4th orbit in hydrogen atom is

According to the special theory of relativity, time is

Due to relative motion of observer and the frame of reference of events, time always:

Electromagnetic radiation or photons interact with matter in

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

The positron was discovered by:

When platinum wire is heated, it appears cherry red at

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

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

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

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

Which of the following is not an example of intertial frame

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

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

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

When a platinum wire is heated, it appears yellow at

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

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

The energy of photon 'E' is proported to

The photon of radio-waves has energy of about

Photoelectrons are emitted when ultraviolet light falls on:

The mass of an object will be doubled at speed

There is no way to detect:

0.1 kg mass will be equivalent to the energy

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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