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	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
2	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
3	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these
4	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
5	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
6	From the theory of relativity, momentum p of the photon is related to energy as	A. p = hfc B. p = hf/c C. p = f(hc,f) D. p = cf/h
7	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
8	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
9	When a high energy photon interact with a metal, which of the following effect is most likely to be taken place	A. pair production B. photoelectric effect C. Compton effect D. None of these
10	If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers	A. larger B. shorter C. equal 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

Momentum is a parameter associated with

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

The mass of an object will be doubled at speed

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

Photoelectric effect takes place with a photon of:

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

There is no way to detect:

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

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

When a platinum wire is heated, it appears orange red at

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:

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

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

Which one of the following physical quantities changes with relativistic speed

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

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

Practically the quantity v/c is always:

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

At the temperature, a body emits radiation which is principally

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

Which of the following phenomenon proves the particle nature of light

Wave nature of particle was proposed by

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

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

In order to produce pair production, a photon must have a energy

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

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

The value of threshold frequency for different metals is

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

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

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