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

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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 platinum wire is heated, it appears cherry red at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
2	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
3	An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is	A. 1.66 x 10^-29m B. 1.74 x 10^-10cm C. 17.4 x 10^-6m D. 1.74 x 10^-10m
4	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
5	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
6	When low energy photon interact with a metal,which of the following effect is likely to be taken place	A. pair production B. photoelectric C. Compton effect D. None of these
7	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
8	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
9	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
10	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these

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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

Absolute motion cannot be detected

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

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

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

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

The photon of radio-waves has energy of about

The mass of an object will be doubled at speed

Which of the following is not an example of intertial frame

The special theory of relativity is based on:

The energy of the 4th orbit in hydrogen atom is

When the atomic particle are moving with velocities approaching that of light:

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

Wave nature of particle was proposed by

Pair production is the phenomenon in which

The existence of position was predicted by Dirace in

Practically the quantity v/c is always:

The concept of direction is purely:

Davision and Germer performed experiment to verify

Strictly speaking, the earth is:

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

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

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

The positron was discovered by:

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

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

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

0.1 kg mass will be equivalent to the energy

de-Broglies hypthesis was experimentally verified by

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

the symbol to be used in relativity problems denotes:

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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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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes: