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

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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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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	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
2	G.P. Thomson observer experimentally that electrons and neutrons possess	A. particle-like properties B. wave-like properties C. neither particle nor wave like properties D. none of these
3	According to the Max plank, energy is redialed or absorbed in	A. discrete packets B. continuous waves C. either of them D. none of these
4	In order to produce pair production, a photon must have a energy	A. 0.511 Me v B. 0.256 Me v C. 1.02 Me v D. 0.956 Me v
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	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
7	When a platinum wire is heated, it appears yellow 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	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 a platinum wire is heated, it appears white 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

A black body is

A particle having mass and charge equal to that of an electron is called:

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

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

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

Absolute motion cannot be detected

According to the special theory of relativity, a moving clock

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

Newton's law of motion do not hold in

Practically the quantity v/c is always:

Which of the following is not an example of intertial frame

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

The energy of the 4th orbit in hydrogen atom is

According to the special theory of relativity, time is

Pair production is the phenomenon in which

The unit of work function is:

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

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

The special theory of relativity is based on the

Momentum is a parameter associated with

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

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

Compton shift refers to:

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

The special theory of relativity is based on:

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 dull red at about

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

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

the symbol to be used in relativity problems denotes:

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ECAT Physics Chapter 19 Important MCQ's

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