ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	The concept of direction and position are purely	A. absolute B. relative C. absolute or relative D. none of these
2	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
3	The photoelectric effect, the maximum energy of photoelectrons depends on the	A. particular metal surface B. frequency of incident light C. both of them D. none of them
4	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	A. 2.9 s B. 3.0 s C. 6.6 s D. 9.6 s
5	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
6	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
7	Victor de-Brogile received the Nobel prize in physics in	A. 1925 B. 1929 C. 1932 D. 1935
8	The mass of an object will be doubled at speed	A. 1.6 x 10⁸ms^-1 B. 2.6 X 10⁸ms^-1 C. 2.6 x 10⁷ms^-1 D. 2.6 x 10⁹ms^-1
9	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
10	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always

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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 dilation of time applies to the timing processes which are:

If a body reaches a speed equal to the speed of light, then its mass will became

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

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

Wave nature of particle was proposed by

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

Momentum is a parameter associated with

The photon of radio-waves has energy of about

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

At the temperature, a body emits radiation which is principally

The existence of position was predicted by Dirace in

Position was discovered by Carl Anderson in

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

The idea of quantization of energy was proposed by:

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

An inertial frame is that frame in which

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

The general theory of relativity treats problems involving

Compton shift refers to:

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

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

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

The way through which electromagnetic radiations or photons interact with matter depends upon their:

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

Intensity of light determines the:

The concept of direction and position are purely

The special theory of relatively treats the problems involving:

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

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

A black body is

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ECAT Physics Chapter 19 Important MCQ's

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