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	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	Due to relative motion of observer and the frame of reference of events, time always:	A. Dilates itself B. Contracts itself C. Stretches itself D. Both (A) and (C)
3	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate
4	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C
5	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
6	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
7	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
8	In the compton's effect, it is found that the wavelength of incident x-rays is	A. greater than the wavelength of scattered x-rays B. equal to the wavelength of scattered x-rays C. less than the wavelength of scattered x-rays D. any one of these
9	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always
10	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴

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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

When platinum wire is heated, it appears cherry red at

The length contraction happens only

Photoelectric effect takes place with a photon of:

0.1 kg mass will be equivalent to the energy

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

An inertial frame is that frame in which

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

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

In photoelectric effect the energy of ejected electrons depend on

Converse of pair production is known as

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:

A black body is

Victor de-Brogile received the Nobel prize in physics in

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

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

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

Which of the following phenomenon proves the particle nature of light

When a platinum wire is heated, it appears white at

Pair production is the phenomenon in which

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

The special theory of relativity treats problems invoving

Davision and Germer performed experiment to verify

When a platinum wire is heated, it appears orange red at

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

S.I. unit of planks constant is

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

When a platinum wire is heated, it appears yellow at

de-Broglies hypthesis was experimentally verified by

Wien's constant is measured in:

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