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	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal
2	An intertial frame of reference is a frame of reference which is	A. at rest B. moving with uniform velocity C. either at rest or moving with uniform velocity D. none of these
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	Max plank received the Nobel Prize in physics for his discovery of energy quanta in	A. 1900 B. 1906 C. 1912 D. 1918
5	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
6	There is no way to detect:	A. Absolute uniform motion B. Accelerated motion C. State rest D. State of motion
7	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
8	According to Einstein, with the great increase in the speed of the body the relativistic length of the body	A. Remains constant B. Decreases C. Increases D. Reduces to zero
9	Compton derived an expression to find compton shift by applying to the process, the law of conservation of:	A. Energy only B. Momentum only C. Mass only D. Charge only
10	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction 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

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

When a platinum wire is heated, it appears yellow at

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

Practically the quantity v/c is always:

Pair production is the phenomenon in which

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

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

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

Compton was awarded Nobel prize in physics in

The special theory of relatively treats the problems involving:

According to the de-Brogile relation, an object of large mass and ordinary speed has

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

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

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

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

An inertial frame is that frame in which

The special theory of relativity treats problems invoving

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

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

Photocell is a device which converts

When a position comes close to an electron they annihilate into

Which of the following is not an example of intertial frame

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

the symbol to be used in relativity problems denotes:

According to the Max plank, energy is redialed or absorbed in

The length contraction happens only

The photon of radio-waves has energy of about

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

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

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

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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: