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	An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is	A. 1.66 x 10^-29m B. 1.74 x 10^-10cm C. 17.4 x 10^-6m D. 1.74 x 10^-10m
3	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates
4	A non-inertial frame of reference is one, in which	A. law of inertial is valid B. all laws of physics are the same in all frames C. a>0 or a<0 D. a=0
5	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
6	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
7	According to the special theory of relativity, a moving clock	A. runs faster B. runs slower C. neither runs faster nor slower D. all of these
8	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
9	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
10	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

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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

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

0.1 kg mass will be equivalent to the energy

According to the Max plank, energy is redialed or absorbed in

The mass of an object will be doubled at speed

Intensity of light determines the:

A photon is considered to have

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

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

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

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

The concept of direction and position are purely

The photon of radio-waves has energy of about

The special theory of relatively treats the problems involving:

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

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

The value of threshold frequency for different metals is

The special theory of relativity treats problems invoving

In photoelectric effect the energy of ejected electrons depend on

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

S.I. unit of planks constant is

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

Which one of the following physical quantities changes with relativistic speed

Electromagnetic radiation or photons interact with matter in

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

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

The length contraction happens only

According to the special theory of relativity, a moving clock

Wave nature of particle was proposed by

Which of the following is not an example of intertial frame

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

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