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

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Asghar Ali 03 - Mar - 2021 10 Min 50 Sec 100/120
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shamsuddin 19 - Aug - 2021 10 Min 50 Sec 75/120
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khadim Hussain 03 - Mar - 2021 10 Min 50 Sec 75/120
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Ali ahmad 19 - Jul - 2018 09 Min 44 Sec 70/120
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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	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
2	The length contraction happens only	A. Opposite to the direction of motion B. along the direction of motion C. perpendicular to the direction of motion D. In any direction
3	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
4	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
5	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
6	Position was discovered by Carl Anderson in	A. 1920 B. 1925 C. 1928 D. 1932
7	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
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	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	A. 1.66 m B. 1.0 m C. 0.66 m D. 2.66 m
10	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

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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

Photoelectric effect takes place with a photon of:

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

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

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

At the temperature, a body emits radiation which is principally

Victor de-Brogile received the Nobel prize in physics in

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

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

Absolute motion cannot be detected

When a platinum wire is heated, it appears dull red at about

The value of threshold frequency for different metals is

Position was discovered by Carl Anderson in

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

The nature of radiations emitted by a hot body depends upon its:

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

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

The positron was discovered by:

The idea of quantization of energy was proposed by:

The existence of position was predicted by Dirace in

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

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

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

Strictly speaking, the earth is:

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

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

An intertial frame of reference is a frame of reference which is

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

The energy of a photon is represented by

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

Compton was awarded Nobel prize in physics in

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