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 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
2	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
3	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal
4	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
5	When low energy photon interact with a metal,which of the following effect is likely to be taken place	A. pair production B. photoelectric C. Compton effect D. None of these
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 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	The mass of an object will be doubled at speed	A. 1.6 x 10⁸ms^-1 B. 2.6 X 10⁸ms^-1 C. 2.6 x 10⁷ms^-1 D. 2.6 x 10⁹ms^-1
9	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
10	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above

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

When platinum wire is heated, it appears cherry red at

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

Momentum is a parameter associated with

The concept of direction is purely:

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

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

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

Photocell is a device which converts

A particle having mass and charge equal to that of an electron is called:

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

The special theory of relativity is based on the

Converse of pair production is known as

Electromagnetic -radiation means:

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

In process of annihilation of matter, the two photons produced move in opposite direction to converse

the symbol to be used in relativity problems denotes:

The concept of direction and position are purely

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

A black body is

Newton's law of motion do not hold in

A photon is considered to have

An inertial frame is that frame in which

de-Broglies hypthesis was experimentally verified by

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

Victor de-Brogile received the Nobel prize in physics in

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

Intensity of light determines the:

The positron was discovered by:

The Stephen-Boltzmann law for the black body radiation is given by

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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: