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

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ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
2	The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by	A. Max plank B. Newton C. Einstein D. J.J. Thomson
3	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
4	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
5	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
6	If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be	A. 2.120°A B. 0.212°A C. 21.2°A D. 0.14° a
7	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)
8	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
9	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
10	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

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

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

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

A photon is considered to have

The concept of direction is purely:

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

The special theory of relativity is based on:

The energy of the 4th orbit in hydrogen atom is

S.I. unit of planks constant is

Which of the following phenomenon proves the particle nature of light

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

The general theory of relativity treats problems involving

Photoelectric effect takes place with a photon of:

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

Wien's constant is measured in:

The inside cavity of the black body is

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

the symbol to be used in relativity problems denotes:

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Davision and Germer performed experiment to verify

Victor de-Brogile received the Nobel prize in physics in

Pair production is the phenomenon in which

The special theory of relatively treats the problems involving:

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

There is no way to detect:

Intensity of light determines the:

According to the special theory of relativity

de-Broglies hypthesis was experimentally verified by

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

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

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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:

The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be