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	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
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	The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be	A. 500 m B. 500 nm C. 500 km D. 500 cm
4	The concept of direction and position are purely	A. absolute B. relative C. absolute or relative D. none of these
5	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
6	If a material object moves with the speed of light 'C' its mass becomes	A. Equal to its rest mass B. Four times of its rest mass C. Double of its rest mass D. Infinite
7	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
8	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
9	the dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
10	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

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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

Newton's law of motion do not hold in

The general theory of relativity treats problems involving

The energy of a photon is represented by

Max Planck received the Nobel Prize for his discovery of energy quants in:

The energy of the 4th orbit in hydrogen atom is

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

The length contraction happens only

Electromagnetic radiation or photons interact with matter in

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

Due to relative motion of observer and the frame of reference of events, time always:

According to the special theory of relativity, a moving clock

When a platinum wire is heated, it appears yellow at

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

A black body is

According to the special theory of relativity

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

Which of the following phenomenon proves the particle nature of light

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

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

Compton studied the scattering of x-rays by loosely bound electrons from:

The unit of work function is:

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

the dilation of time applies to the timing processes which are:

The concept of direction and position are purely

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

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

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

Electromagnetic -radiation means:

The special theory of relatively treats the problems involving:

Photoelectric effect takes place with a photon of:

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ECAT Physics Chapter 19 Important MCQ's

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