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 energy of the 4th orbit in hydrogen atom is	A. 2.5 ev B. - 3.5 ev C. -0.85 ev D. -13.6 ev
2	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
3	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
4	The unit of work function is:	A. Joule B. Electron volt C. That of threshold frequency D. Both (A) and (B)
5	The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is	A. 100 ev B. 10⁶e v C. 10³e v D. 1.0 e v
6	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these
7	The special theory of relatively treats the problems involving:	A. Inertial frames of reference B. Non-inertial frames C. Non-accelerated frame D. Botha (A) and (C)
8	Position was discovered by Carl Anderson in	A. 1920 B. 1925 C. 1928 D. 1932
9	Davision and Germer performed experiment to verify	A. de-Brogile hypothesis B. theory of relativity C. Newton's law of gravitation D. Mass-energy relation
10	The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:	A. Wien's constant B. Stefen's constnat C. Planck's constant D. Boltzmann's constant

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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

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

The concept of direction is purely:

The special theory of relatively treats the problems involving:

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

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

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

The year when A.H. compton was awarded Nobel Prize is:

Wien's constant is measured in:

the symbol to be used in relativity problems denotes:

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

The Stephen-Boltzmann law for the black body radiation is given by

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

The mass of an object will be doubled at speed

Compton shift refers to:

Absolute motion cannot be detected

The inside cavity of the black body is

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

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

According to the special theory of relativity, time is

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

The general theory of relativity treats problems involving

The energy of a photon is represented by

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

Electromagnetic -radiation means:

The photon of radio-waves has energy of about

The positron was discovered by:

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

Which one of the following physical quantities changes with relativistic speed

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

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