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	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
2	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
3	The special theory of relativity treats problems invoving	A. inertial frame of references B. accelerating frame of references C. both of these 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	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C
6	Compton shift refers to:	A. Photon B. Meson C. Proton D. Positron
7	According to Einstein, with the great increase in the speed of the body the relativistic length of the body	A. Remains constant B. Decreases C. Increases D. Reduces to zero
8	Max Planck received the Nobel Prize for his discovery of energy quants in:	A. 1718 AD B. 1918 AH C. 1818 AD D. 1918 AD
9	According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body	A. Remains constant B. Decreases C. Increases to infinity D. Reduced to zero
10	According to the de-Brogile relation, an object of large mass and ordinary speed has	A. very small wavelength B. very large wavelength C. very small frequency D. all 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

When a platinum wire is heated, it appears orange red at

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

The energy of the 4th orbit in hydrogen atom is

According to the special theory of relativity, time is

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

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

Max Planck received the Nobel Prize for his discovery of energy quants in:

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

the symbol to be used in relativity problems denotes:

The idea of quantization of energy was proposed by:

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

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

According to the special theory of relativity, a moving clock

de-Broglies hypthesis was experimentally verified by

The special theory of relatively treats the problems involving:

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

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

Converse of pair production is known as

Which one of the following physical quantities changes with relativistic speed

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

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

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

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

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

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:

The positron was discovered by:

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

Which of the following is not an example of intertial frame

Electromagnetic radiation or photons interact with matter in

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

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ECAT Physics Chapter 19 Important MCQ's

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