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	Max plank received the Nobel Prize in physics for his discovery of energy quanta in	A. 1900 B. 1906 C. 1912 D. 1918
2	The energy of photon 'E' is proported to	A. The magnetic field H B. The electric field E C. Both the electric and magnetic field H and E D. Frequency
3	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
4	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
5	If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be	A. 2.120°A B. 0.212°A C. 21.2°A D. 0.14° a
6	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
7	When low energy photon interact with a metal,which of the following effect is likely to be taken place	A. pair production B. photoelectric C. Compton effect D. None of these
8	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
9	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate
10	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴

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

The mass of an object will be doubled at speed

Which one of the following physical quantities changes with relativistic speed

The energy of a photon is represented by

Wave nature of particle was proposed by

Electromagnetic -radiation means:

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

If a body reaches a speed equal to the speed of light, then its mass will became

The photoelectric effect, the maximum energy of photoelectrons depends on the

When the atomic particle are moving with velocities approaching that of light:

Pair production is the phenomenon in which

The concept of direction is purely:

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

The energy of the 4th orbit in hydrogen atom is

The special theory of relativity is based on:

Compton studied the scattering of x-rays by loosely bound electrons from:

Converse of pair production is known as

The inside cavity of the black body is

An inertial frame is that frame in which

The photon of radio-waves has energy of about

Practically the quantity v/c is always:

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

From the theory of relativity, momentum p of the photon is related to energy as

According to the special theory of relativity

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

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

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

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

When a platinum wire is heated, it appears yellow at

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

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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