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 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
2	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
3	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
4	When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called	A. thermoionic electrons B. free electrons C. photoelectrons D. slow electrons
5	According to the special theory of relativity, a moving clock	A. runs faster B. runs slower C. neither runs faster nor slower D. all of these
6	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
7	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
8	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
9	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
10	The positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above

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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

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

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

If a material object moves with the speed of light 'C' its mass becomes

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

When platinum wire is heated, it appears cherry red at

Which one of the following physical quantities changes with relativistic speed

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Newton's law of motion do not hold in

A non-inertial frame of reference is one, in which

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

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

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

In process of annihilation of matter, the two photons produced move in opposite direction to converse

0.1 kg mass will be equivalent to the energy

When a position comes close to an electron they annihilate into

The energy of the 4th orbit in hydrogen atom is

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

the symbol to be used in relativity problems denotes:

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

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

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

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

Electromagnetic -radiation means:

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

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

The positron was discovered by:

The value of the plank's constant 'h' is given by

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

The mass of an object will be doubled at speed

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

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ECAT Physics Chapter 19 Important MCQ's

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