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	Due to relative motion of observer and the frame of reference of events, time always:	A. Dilates itself B. Contracts itself C. Stretches itself D. Both (A) and (C)
2	If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be	A. 2.120°A B. 0.212°A C. 21.2°A D. 0.14° a
3	The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:	A. Lummer B. Planck C. Pringsheim D. Both (A ) and (B)
4	The value of the Stephen's constant for black body radiations is given by	A. 5.6 x 10⁸Wm^-2K^-4 B. 5.67 x 10^-8Wm^-2K^-4 C. 2.9 x 10^-3mK D. 2.9 x 10³mK
5	Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in	A. 1890 B. 1895 C. 1900 D. 1905
6	Newton's law of motion do not hold in	A. an accelerated frame of reference B. an unaccelerated frame of reference C. both of these D. none of these
7	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
8	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well
9	The positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
10	The length contraction happens only	A. Opposite to the direction of motion B. along the direction of motion C. perpendicular to the direction of motion D. In any direction

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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 value of the Stephen's constant for black body radiations is given by

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

When a position comes close to an electron they annihilate into

Which of the following phenomenon proves the particle nature of light

There is no way to detect:

A black body is

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

Electromagnetic radiation or photons interact with matter in

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

An inertial frame is that frame in which

The unit of work function is:

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

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

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

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

Wien's constant is measured in:

Victor de-Brogile received the Nobel prize in physics in

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

When a platinum wire is heated, it appears dull red at about

de-Broglies hypthesis was experimentally verified by

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

The idea of quantization of energy was proposed by:

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

Practically the quantity v/c is always:

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

When a position comes close to an electron they annihilate into photons such that

Wave nature of particle was proposed by

The special theory of relatively treats the problems involving:

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

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ECAT Physics Chapter 19 Important MCQ's

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