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	According to the de-Brogile relation, an object of large mass and ordinary speed has	A. very small wavelength B. very large wavelength C. very small frequency D. all of these
2	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
3	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
4	The Nobel Prize on the explanation of photoelectric effect was awarded to:	A. Max. Planck B. Maxwell C. Bohr D. Rutherford
5	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well
6	According to the special theory of relativity	A. mass and energy are same entities B. mass and energy are same entities but interconverible C. mass and energy are different entities but interconverible D. mass and energy are different entities but non-interconveritble
7	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C
8	Pair production is the phenomenon in which	A. matter is converted into energy B. energy is converted into matter C. light is converted into electrical energy D. electrical energy is converted into light
9	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
10	The energy of photon 'E' is proported to	A. The magnetic field H B. The electric field E C. Both the electric and magnetic field H and E D. Frequency

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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 idea of quantization of energy was proposed by:

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

The length contraction happens only

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

When a platinum wire is heated, it appears white at

From the theory of relativity, momentum p of the photon is related to energy as

Photocell is a device which converts

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

The concept of direction and position are purely

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

Wave nature of particle was proposed by

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

When platinum wire is heated, it appears cherry red at

Practically the quantity v/c is always:

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

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

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

Electromagnetic -radiation means:

The general theory of relativity treats problems involving

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Converse of pair production is known as

Max Planck received the Nobel Prize for his discovery of energy quants in:

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

The energy of photon 'E' is proported to

Absolute motion cannot be detected

There is no way to detect:

A particle having mass and charge equal to that of an electron is called:

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

Intensity of light determines the:

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

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