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	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
2	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
3	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
4	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
5	In the compton's effect, it is found that the wavelength of incident x-rays is	A. greater than the wavelength of scattered x-rays B. equal to the wavelength of scattered x-rays C. less than the wavelength of scattered x-rays D. any one of these
6	The emission of electrons from a metal surface when exposed to light of suitable frequency is called the	A. pair production B. Compton effect C. photoelectric effect D. relativity
7	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate
8	The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes	A. 2 mo B. 1.67 mo C. 0.67 mo D. 2.67 mo
9	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
10	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²

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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 photoelectric effect, the maximum energy of photoelectrons depends on the

The energy of a photon is represented by

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Photoelectric effect takes place with a photon of:

Compton shift refers to:

According to the special theory of relativity, time is

Which of the following phenomenon proves the particle nature of light

Absolute motion cannot be detected

The energy of the 4th orbit in hydrogen atom is

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

According to the special theory of relativity, a moving clock

The concept of direction and position are purely

the symbol to be used in relativity problems denotes:

de-Broglies hypthesis was experimentally verified by

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

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

The positron was discovered by:

Which of the following is not an example of intertial frame

Electromagnetic radiation or photons interact with matter in

G.P. Thomson observer experimentally that electrons and neutrons possess

At the temperature, a body emits radiation which is principally

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

The general theory of relativity treats problems involving

When a platinum wire is heated, it appears yellow at

When platinum wire is heated, it appears cherry red at

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

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

When a platinum wire is heated, it appears white at

S.I. unit of planks constant is

In photoelectric effect the energy of ejected electrons depend on

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ECAT Physics Chapter 19 Important MCQ's

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