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 Nobel Prize on the explanation of photoelectric effect was awarded to:	A. Max. Planck B. Maxwell C. Bohr D. Rutherford
2	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
3	Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of	A. photoelectric effect B. pair production C. Compton effect D. uncertainty principle
4	In photoelectric effect the energy of ejected electrons depend on	A. The frequency B. The intensity C. Both frequency and intensity D. None of these
5	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
6	Due to relative motion of observer and the frame of reference of events, time always:	A. Dilates itself B. Contracts itself C. Stretches itself D. Both (A) and (C)
7	The existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
8	An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is	A. 1.66 x 10^-29m B. 1.74 x 10^-10cm C. 17.4 x 10^-6m D. 1.74 x 10^-10m
9	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
10	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

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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 photon of radio-waves has energy of about

The energy of photon 'E' is proported to

Position was discovered by Carl Anderson in

The special theory of relativity is based on:

According to the special theory of relativity, time is

The energy of the 4th orbit in hydrogen atom is

An inertial frame is that frame in which

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

The nature of radiations emitted by a hot body depends upon its:

Absolute motion cannot be detected

The mass of an object will be doubled at speed

According to the special theory of relativity, a moving clock

If a material object moves with the speed of light 'C' its mass becomes

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

Compton shift refers to:

de-Broglies hypthesis was experimentally verified by

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

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

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

Electromagnetic -radiation means:

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

According to the special theory of relativity

Momentum is a parameter associated with

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

When a position comes close to an electron they annihilate into

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

Newton's law of motion do not hold in

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ECAT Physics Chapter 19 Important MCQ's

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