ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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Ali ahmad 19 - Jul - 2018 09 Min 44 Sec 70/120
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Ziyad Rehman Sheikh 16 - Nov - 2022 07 Min 21 Sec 40/120
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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	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
2	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
3	With the help of 50 K v electron microscope, a resolution of	A. 0.5 to 1 m to possible B. 1 m to 10 m is possible C. 0.5 to 1 nm is possible D. 1 to 10 nm is possible
4	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
5	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
6	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
7	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
8	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
9	The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:	A. Wien's constant B. Stefen's constnat C. Planck's constant D. Boltzmann's constant
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

Photocell is a device which converts

When a position comes close to an electron they annihilate into

The idea of quantization of energy was proposed by:

The general theory of relativity treats problems involving

Strictly speaking, the earth is:

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

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

The energy of the 4th orbit in hydrogen atom is

The value of the Stephen's constant for black body radiations is given by

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

The unit of work function is:

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

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

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

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

The special theory of relatively treats the problems involving:

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

Practically the quantity v/c is always:

The energy of a photon is represented by

The concept of direction is purely:

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

In photoelectric effect the energy of ejected electrons depend on

When a platinum wire is heated, it appears white at

Photoelectric effect takes place with a photon of:

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

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

The special theory of relativity is based on the

The energy of photon 'E' is proported to

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

When a platinum wire is heated, it appears yellow at

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ECAT Physics Chapter 19 Important MCQ's

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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes: