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 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
2	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
3	When platinum wire is heated, it appears cherry red at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
4	The existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
5	According to the special theory of relativity	A. mass and energy are same entities B. mass and energy are same entities but interconverible C. mass and energy are different entities but interconverible D. mass and energy are different entities but non-interconveritble
6	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate
7	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}
8	According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the	A. number of photoelectrons B. size of the photoelectrons C. charge on photoelectrons D. K.E of photoelectrons
9	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
10	When a position comes close to an electron they annihilate into photons such that	A. each photon has energy 0.51 Me v B. each photon has energy 1.02 Me v C. each photon has energy 0.25 Me v D. none of these

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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:

Victor de-Brogile received the Nobel prize in physics in

S.I. unit of planks constant is

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

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

An inertial frame is that frame in which

Compton shift refers to:

The special theory of relativity is based on:

The positron was discovered by:

The energy of the 4th orbit in hydrogen atom is

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

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

Which of the following is not an example of intertial frame

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

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

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

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

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

A non-inertial frame of reference is one, in which

Intensity of light determines the:

In photoelectric effect the energy of ejected electrons depend on

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

0.1 kg mass will be equivalent to the energy

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

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

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

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

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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

The value of threshold frequency for different metals is

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