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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Aarij 08 - Dec - 2024 02 Min 25 Sec 65/120
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Waleed Ahmed 26 - Feb - 2023 10 Min 00 Sec 65/120
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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	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
2	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
3	A high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one of them
4	The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as	A. classical mechanics B. Newtonian mechanics C. quantum mechanics D. statistical mechanics
5	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
6	There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as	A. maximum frequency B. minimum frequency C. threshold frequency D. all of these
7	With the help of 50 K v electron microscope, a resolution of	A. 0.5 to 1 m to possible B. 1 m to 10 m is possible C. 0.5 to 1 nm is possible D. 1 to 10 nm is possible
8	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
9	If a body reaches a speed equal to the speed of light, then its mass will became	A. zero B. very small C. infinity D. none of these
10	When platinum wire is heated, it appears cherry red at	A. 1600°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

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Position was discovered by Carl Anderson in

The existence of position was predicted by Dirace in

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

The length contraction happens only

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

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

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

If a material object moves with the speed of light 'C' its mass becomes

When a platinum wire is heated, it appears yellow at

Absolute motion cannot be detected

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

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

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

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

According to the special theory of relativity

Wave nature of particle was proposed by

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

When a platinum wire is heated, it appears white at

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

The idea of quantization of energy was proposed by:

When a position comes close to an electron they annihilate into

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

the symbol to be used in relativity problems denotes:

Electromagnetic radiation or photons interact with matter in

Victor de-Brogile received the Nobel prize in physics in

The special theory of relativity is based on:

Pair production is the phenomenon in which

Which of the following phenomenon proves the particle nature of light

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