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

Top Scorers Of ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQ`s Test

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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	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
2	The special theory of relativity treats problems invoving	A. inertial frame of references B. accelerating frame of references C. both of these D. none of these
3	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
4	The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is	A. 100 ev B. 10⁶e v C. 10³e v D. 1.0 e v
5	Photocell is a device which converts	A. chemical energy into electrical energy B. electrical energy into light energy C. heat energy into electrical energy D. light energy into electrical energy
6	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
7	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
8	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates
9	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²
10	In process of annihilation of matter, the two photons produced move in opposite direction to converse	A. momentum B. charge C. energy D. mass

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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 was awarded Nobel prize in physics in

Electromagnetic -radiation means:

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

Due to relative motion of observer and the frame of reference of events, time always:

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

Pair production is the phenomenon in which

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

Photoelectric effect takes place with a photon of:

The energy of photon 'E' is proported to

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

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

The unit of work function 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:

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

When a platinum wire is heated, it appears yellow at

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

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

The special theory of relatively treats the problems involving:

According to the special theory of relativity, a moving clock

The value of the Stephen's constant for black body radiations is given by

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

At the temperature, a body emits radiation which is principally

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

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

The special theory of relativity is based on the

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

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

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

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

The energy of a photon is represented by

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Top Scorers Of ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQ`s Test

ECAT Physics Chapter 19 Important MCQ's

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