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	Newton's law of motion do not hold in	A. an accelerated frame of reference B. an unaccelerated frame of reference C. both of these D. none of these
2	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
3	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
4	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
5	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
6	Davision and Germer performed experiment to verify	A. de-Brogile hypothesis B. theory of relativity C. Newton's law of gravitation D. Mass-energy relation
7	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
8	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
9	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
10	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C

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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

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

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

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

According to the special theory of relativity, time is

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

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

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

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

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

When a platinum wire is heated, it appears yellow at

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

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

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

There is no way to detect:

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

Photoelectric effect takes place with a photon of:

The special theory of relatively treats the problems involving:

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

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

If a body reaches a speed equal to the speed of light, then its mass will became

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

When a position comes close to an electron they annihilate into

Converse of pair production is known as

Wave nature of particle was proposed by

When a platinum wire is heated, it appears white at

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

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

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

The special theory of relativity is based on the

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