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	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	Which of the following is not an example of intertial frame	A. a body placed on the surface of earth B. a body placed in a car moving with uniform velocity C. a body placed in a car moving with same acceleration D. none of these
3	A non-inertial frame of reference is one, in which	A. law of inertial is valid B. all laws of physics are the same in all frames C. a>0 or a<0 D. a=0
4	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
5	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
6	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
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 ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:	A. Wien's constant B. Stefen's constnat C. Planck's constant D. Boltzmann's constant
9	The positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
10	According to Einstein, with the great increase in the speed of the body the relativistic length of the body	A. Remains constant B. Decreases C. Increases D. Reduces to zero

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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

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

The Einstein's changes in length, mass and time are not observed in common life because

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

Victor de-Brogile received the Nobel prize in physics in

The concept of direction is purely:

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

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

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

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

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

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

Which one of the following physical quantities changes with relativistic speed

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

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

The energy of photon 'E' is proported to

The special theory of relativity treats problems invoving

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

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

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

Photocell is a device which converts

When low energy photon interact with a metal,which of the following effect is likely to be taken place

The length contraction happens only

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

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

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

the symbol to be used in relativity problems denotes:

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

In order to produce pair production, a photon must have a energy

Wave nature of particle was proposed by

In photoelectric effect the energy of ejected electrons depend on

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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