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 photon of radio-waves has energy of about	A. 1 Me V B. 1 Ke v C. 10^-10e v D. 10¹⁰e v
2	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal
3	Pair production is the phenomenon in which	A. matter is converted into energy B. energy is converted into matter C. light is converted into electrical energy D. electrical energy is converted into light
4	If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers	A. larger B. shorter C. equal D. none of these
5	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
6	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
7	Strictly speaking, the earth is:	A. An accelerated frame of reference B. A non-inertial frame of reference C. An inertial frame of reference D. ^{A non-accelerated frame of reference}
8	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
9	The unit of work function is:	A. Joule B. Electron volt C. That of threshold frequency D. Both (A) and (B)
10	When a position comes close to an electron they annihilate into photons such that	A. each photon has energy 0.51 Me v B. each photon has energy 1.02 Me v C. each photon has energy 0.25 Me v D. none 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

The special theory of relatively treats the problems involving:

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

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Converse of pair production is known as

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

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

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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

The inside cavity of the black body is

The photon of radio-waves has energy of about

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

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

The special theory of relativity is based on:

The photoelectric effect, the maximum energy of photoelectrons depends on the

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

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

Newton's law of motion do not hold in

A photon is considered to have

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

de-Broglies hypthesis was experimentally verified by

Which one of the following physical quantities changes with relativistic speed

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

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

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

The value of the plank's constant 'h' is given by

The positron was discovered by:

Compton shift refers to:

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Electromagnetic -radiation means:

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

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ECAT Physics Chapter 19 Important MCQ's

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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:

The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be