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

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Ziyad Rehman Sheikh 16 - Nov - 2022 07 Min 21 Sec 40/120
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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	The concept of direction and position are purely	A. absolute B. relative C. absolute or relative D. none of these
2	The emission of electrons from a metal surface when exposed to light of suitable frequency is called the	A. pair production B. Compton effect C. photoelectric effect D. relativity
3	According to the de-Brogile relation, an object of large mass and ordinary speed has	A. very small wavelength B. very large wavelength C. very small frequency D. all of these
4	If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:	A. Newton B. Joule C. Joule-Sec D. Joule-s^-1
5	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules
6	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always
7	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
8	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
9	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
10	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above

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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

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

Momentum is a parameter associated with

Newton's law of motion do not hold in

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

The energy of the 4th orbit in hydrogen atom is

de-Broglies hypthesis was experimentally verified by

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

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

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

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

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

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

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

The special theory of relativity treats problems invoving

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

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

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

In process of annihilation of matter, the two photons produced move in opposite direction to converse

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

The positron was discovered by:

Wien's constant is measured in:

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

The unit of work function is:

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

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:

Davision and Germer performed experiment to verify

When a platinum wire is heated, it appears yellow at

An inertial frame is that frame in which

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

The existence of position was predicted by Dirace in

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ECAT Physics Chapter 19 Important MCQ's

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The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be

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