ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

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 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
3	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
4	The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of	A. 2 cm/s B. 20 cm/s C. 200 cm/s D. 2000 cm/s
5	The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is	A. 100 J B. 1.6 x 10^-17J C. 100 eV D. 1.6 x 10^-17eV
6	Max Planck received the Nobel Prize for his discovery of energy quants in:	A. 1718 AD B. 1918 AH C. 1818 AD D. 1918 AD
7	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always
8	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
9	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
10	When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called	A. thermoionic electrons B. free electrons C. photoelectrons D. slow electrons

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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

With the help of 50 K v electron microscope, a resolution of

Momentum is a parameter associated with

Which one of the following physical quantities changes with relativistic speed

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

In the compton's effect, it is found that the wavelength of incident x-rays is

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

Absolute motion cannot be detected

Which of the following is not an example of intertial frame

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

de-Broglies hypthesis was experimentally verified by

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

The length contraction happens only

Practically the quantity v/c is always:

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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

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

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

According to the special theory of relativity, a moving clock

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

When a platinum wire is heated, it appears yellow at

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

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

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

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

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

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Electromagnetic -radiation means:

The concept of direction is purely:

Newton's law of motion do not hold in

The Nobel Prize on the explanation of photoelectric effect was awarded to:

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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: