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 year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
2	The value of the plank's constant 'h' is given by	A. 1.6 x 10^-19J B. 1.67 x 10^-27Kg C. 6.63 x 10³⁴Js D. 6.63 x 10^-34Js
3	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
4	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
5	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)
6	If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be	A. 2.120°A B. 0.212°A C. 21.2°A D. 0.14° a
7	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
8	A high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one of them
9	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
10	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

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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

A non-inertial frame of reference is one, in which

From the theory of relativity, momentum p of the photon is related to energy as

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

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

According to the special theory of relativity

The length contraction happens only

A black body is

Practically the quantity v/c is always:

There is no way to detect:

0.1 kg mass will be equivalent to the energy

The special theory of relativity is based on the

When platinum wire is heated, it appears cherry red at

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

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

The mass of an object will be doubled at speed

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

Pair production is the phenomenon in which

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

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

G.P. Thomson observer experimentally that electrons and neutrons possess

The energy of photon 'E' is proported to

In photoelectric effect the energy of ejected electrons depend on

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

When the atomic particle are moving with velocities approaching that of light:

The special theory of relatively treats the problems involving:

Compton shift refers to:

The value of threshold frequency for different metals is

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

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

Newton's law of motion do not hold in

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ECAT Physics Chapter 19 Important MCQ's

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