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

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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	The mass of an object will be doubled at speed	A. 1.6 x 10⁸ms^-1 B. 2.6 X 10⁸ms^-1 C. 2.6 x 10⁷ms^-1 D. 2.6 x 10⁹ms^-1
2	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
3	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
4	The Einstein's changes in length, mass and time are not observed in common life because	A. We dont observer then seriously B. The masses are too large C. Their speed is too small than the speed of right D. All of the above
5	According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body	A. Remains constant B. Decreases C. Increases to infinity D. Reduced to zero
6	When a position comes close to an electron they annihilate into photons such that	A. each photon has energy 0.51 Me v B. each photon has energy 1.02 Me v C. each photon has energy 0.25 Me v D. none of these
7	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
8	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
9	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
10	Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of	A. photoelectric effect B. pair production C. Compton effect D. uncertainty principle

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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

The general theory of relativity treats problems involving

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

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

The photon of radio-waves has energy of about

S.I. unit of planks constant is

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

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

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

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

Wave nature of particle was proposed by

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

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

A black body is

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

Newton's law of motion do not hold in

The special theory of relativity treats problems invoving

The concept of direction and position are purely

0.1 kg mass will be equivalent to the energy

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

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

When a platinum wire is heated, it appears yellow at

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

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

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

Which of the following is not an example of intertial frame

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

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

Which one of the following physical quantities changes with relativistic speed

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ECAT Physics Chapter 19 Important MCQ's

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