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 high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one of them
2	From the theory of relativity, momentum p of the photon is related to energy as	A. p = hfc B. p = hf/c C. p = f(hc,f) D. p = cf/h
3	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
4	The length contraction happens only	A. Opposite to the direction of motion B. along the direction of motion C. perpendicular to the direction of motion D. In any direction
5	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
6	The energy of the 4th orbit in hydrogen atom is	A. 2.5 ev B. - 3.5 ev C. -0.85 ev D. -13.6 ev
7	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
8	The special theory of relatively treats the problems involving:	A. Inertial frames of reference B. Non-inertial frames C. Non-accelerated frame D. Botha (A) and (C)
9	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
10	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time

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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

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

When a platinum wire is heated, it appears white at

According to the special theory of relativity, time is

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

Davision and Germer performed experiment to verify

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

According to the de-Brogile relation, an object of large mass and ordinary speed has

Position was discovered by Carl Anderson in

The positron was discovered by:

Electromagnetic -radiation means:

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

According to the special theory of relativity

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

In photoelectric effect the energy of ejected electrons depend on

Which of the following phenomenon proves the particle nature of light

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

Which one of the following physical quantities changes with relativistic speed

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Photocell is a device which converts

The concept of direction and position are purely

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

The inside cavity of the black body is

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

Victor de-Brogile received the Nobel prize in physics in

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

Photoelectrons are emitted when ultraviolet light falls on:

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

Practically the quantity v/c is always:

The existence of position was predicted by Dirace in

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

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ECAT Physics Chapter 19 Important MCQ's

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