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 positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
2	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
3	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
4	The nature of radiations emitted by a hot body depends upon its:	A. Metarial B. Temperature C. colour D. Volume
5	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
6	Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as	A. ON switch B. off switch C. function switch D. none of these
7	The Nobel Prize on the explanation of photoelectric effect was awarded to:	A. Max. Planck B. Maxwell C. Bohr D. Rutherford
8	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
9	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
10	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect 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

Intensity of light determines the:

The unit of work function is:

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

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

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

Photoelectrons are emitted when ultraviolet light falls on:

The mass of an object will be doubled at speed

The Nobel Prize on the explanation of photoelectric effect was awarded to:

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

The existence of position was predicted by Dirace in

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

The energy of photon 'E' is proported to

S.I. unit of planks constant is

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

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

Newton's law of motion do not hold in

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

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

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

Wien's constant is measured in:

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

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

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

the dilation of time applies to the timing processes which are:

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

The special theory of relatively treats the problems involving:

An inertial frame is that frame in which

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

Practically the quantity v/c is always:

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

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Top Scorers Of ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQ`s Test

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: