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 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
2	Compton derived an expression to find compton shift by applying to the process, the law of conservation of:	A. Energy only B. Momentum only C. Mass only D. Charge only
3	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
4	The unit of work function is:	A. Joule B. Electron volt C. That of threshold frequency D. Both (A) and (B)
5	Absolute motion cannot be detected	A. in its own frame of references B. in a different frame of references C. both in its frame and different frame of references D. none of these
6	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	A. 2.9 s B. 3.0 s C. 6.6 s D. 9.6 s
7	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
8	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates
9	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
10	When the atomic particle are moving with velocities approaching that of light:	A. Newton's laws become valid B. Relativistic effects become prominent C. Botha(A) and (B) are valid D. Neither (A)nor (B)

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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

Converse of pair production is known as

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

With the help of 50 K v electron microscope, a resolution of

Photoelectrons are emitted when ultraviolet light falls on:

0.1 kg mass will be equivalent to the energy

The mass of an object will be doubled at speed

A black body is

The photon of radio-waves has energy of about

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

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

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

Wien's constant is measured in:

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

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

The Stephen-Boltzmann law for the black body radiation is given by

Electromagnetic -radiation means:

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

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

Electromagnetic radiation or photons interact with matter in

Strictly speaking, the earth is:

When a platinum wire is heated, it appears white at

The photoelectric effect, the maximum energy of photoelectrons depends on the

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

When a position comes close to an electron they annihilate into photons such that

The general theory of relativity treats problems involving

The concept of direction is purely:

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

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

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

The special theory of relativity is based on the

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