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

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Asghar Ali 03 - Mar - 2021 10 Min 50 Sec 100/120
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khadim Hussain 03 - Mar - 2021 10 Min 50 Sec 75/120
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Ali ahmad 19 - Jul - 2018 09 Min 44 Sec 70/120
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Aarij 08 - Dec - 2024 02 Min 25 Sec 65/120
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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 energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
2	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
3	Max plank received the Nobel Prize in physics for his discovery of energy quanta in	A. 1900 B. 1906 C. 1912 D. 1918
4	The energy of the 4th orbit in hydrogen atom is	A. 2.5 ev B. - 3.5 ev C. -0.85 ev D. -13.6 ev
5	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}
6	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
7	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
8	An intertial frame of reference is a frame of reference which is	A. at rest B. moving with uniform velocity C. either at rest or moving with uniform velocity D. none of these
9	Intensity of light determines the:	A. Energy of each photon B. Number of photons C. Speed of photons D. Size of photons
10	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

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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

Wien's constant is measured in:

Intensity of light determines the:

Position was discovered by Carl Anderson in

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:

Converse of pair production is known as

The Stephen-Boltzmann law for the black body radiation is given by

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

The special theory of relativity is based on:

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

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

When a platinum wire is heated, it appears yellow at

According to the special theory of relativity, time is

Which of the following is not an example of intertial frame

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

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

The existence of position was predicted by Dirace in

When platinum wire is heated, it appears cherry red at

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

A black body is

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

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

0.1 kg mass will be equivalent to the energy

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

Electromagnetic radiation or photons interact with matter in

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

Momentum is a parameter associated with

When a platinum wire is heated, it appears white at

Photoelectrons are emitted when ultraviolet light falls on:

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

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ECAT Physics Chapter 19 Important MCQ's

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