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	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
2	An intertial frame of reference is a frame of reference which is	A. at rest B. moving with uniform velocity C. either at rest or moving with uniform velocity D. none of these
3	There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as	A. maximum frequency B. minimum frequency C. threshold frequency D. all of these
4	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
5	The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is	A. 100 ev B. 10⁶e v C. 10³e v D. 1.0 e v
6	Max plank received the Nobel Prize in physics for his discovery of energy quanta in	A. 1900 B. 1906 C. 1912 D. 1918
7	The value of threshold frequency for different metals is	A. different B. same C. may be different or may be same D. none of these
8	Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as	A. ON switch B. off switch C. function switch D. none of these
9	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
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

Photoelectrons are emitted when ultraviolet light falls on:

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

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

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

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

A black body is

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

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

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

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

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

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

At the temperature, a body emits radiation which is principally

The general theory of relativity treats problems involving

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

0.1 kg mass will be equivalent to the energy

When a position comes close to an electron they annihilate into

The mass of an object will be doubled at speed

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

The energy of a photon is represented by

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

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

The existence of position was predicted by Dirace in

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

The special theory of relativity is based on:

There is no way to detect:

An inertial frame is that frame in which

The inside cavity of the black body is

If a material object moves with the speed of light 'C' its mass becomes

Position was discovered by Carl Anderson in

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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