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	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
2	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
3	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these
4	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²
5	According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the	A. number of photoelectrons B. size of the photoelectrons C. charge on photoelectrons D. K.E of photoelectrons
6	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
7	A non-inertial frame of reference is one, in which	A. law of inertial is valid B. all laws of physics are the same in all frames C. a>0 or a<0 D. a=0
8	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
9	The photon of radio-waves has energy of about	A. 1 Me V B. 1 Ke v C. 10^-10e v D. 10¹⁰e v
10	0.1 kg mass will be equivalent to the energy	A. 9 x 10¹⁵J B. 5 x 10⁸J C. 6 x 10¹⁶J D. 9 x 10^-16J

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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

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

The energy of a photon is represented by

As the light shines on the metal surface, the electrons are ejected

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

Converse of pair production is known as

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

Photocell is a device which converts

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

Position was discovered by Carl Anderson in

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

Which one of the following physical quantities changes with relativistic speed

Photoelectric effect takes place with a photon of:

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

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

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

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

de-Broglies hypthesis was experimentally verified by

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

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

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

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

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

The positron was discovered by:

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

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

Compton was awarded Nobel prize in physics in

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

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

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

Electromagnetic -radiation means:

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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: