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	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. Smaller B. Lerger C. Same D. Much larger
2	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
3	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
4	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
5	In order to produce pair production, a photon must have a energy	A. 0.511 Me v B. 0.256 Me v C. 1.02 Me v D. 0.956 Me v
6	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
7	Strictly speaking, the earth is:	A. An accelerated frame of reference B. A non-inertial frame of reference C. An inertial frame of reference D. ^{A non-accelerated frame of reference}
8	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
9	In photoelectric effect the energy of ejected electrons depend on	A. The frequency B. The intensity C. Both frequency and intensity D. None of these
10	Compton shift refers to:	A. Photon B. Meson C. Proton D. Positron

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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 the atomic particle are moving with velocities approaching that of light:

the symbol to be used in relativity problems denotes:

Which of the following phenomenon proves the particle nature of light

Electromagnetic radiation or photons interact with matter in

The mass of an object will be doubled at speed

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

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

According to the special theory of relativity

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

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

When a platinum wire is heated, it appears white at

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

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

Compton was awarded Nobel prize in physics in

The length contraction happens only

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

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

Intensity of light determines the:

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Photocell is a device which converts

The general theory of relativity treats problems involving

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

The value of threshold frequency for different metals is

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

The concept of direction and position are purely

Converse of pair production is known as

A photon is considered to have

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

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

0.1 kg mass will be equivalent to the energy

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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