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	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
2	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
3	Photocell is a device which converts	A. chemical energy into electrical energy B. electrical energy into light energy C. heat energy into electrical energy D. light energy into electrical energy
4	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
5	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
6	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
7	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
8	Victor de-Brogile received the Nobel prize in physics in	A. 1925 B. 1929 C. 1932 D. 1935
9	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
10	The mass of an object will be doubled at speed	A. 1.6 x 10⁸ms^-1 B. 2.6 X 10⁸ms^-1 C. 2.6 x 10⁷ms^-1 D. 2.6 x 10⁹ms^-1

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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 special theory of relativity treats problems invoving

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

the symbol to be used in relativity problems denotes:

Electromagnetic radiation or photons interact with matter in

The energy of the 4th orbit in hydrogen atom is

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

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

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

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

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

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

When a position comes close to an electron they annihilate into

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

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

The positron was discovered by:

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

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

Strictly speaking, the earth is:

The mass of an object will be doubled at speed

The general theory of relativity treats problems involving

A black body is

Which one of the following physical quantities changes with relativistic speed

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

When a platinum wire is heated, it appears dull red at about

Davision and Germer performed experiment to verify

The unit of work function is:

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

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

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

The photoelectric effect, the maximum energy of photoelectrons depends on the

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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