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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shamsuddin 19 - Aug - 2021 10 Min 50 Sec 75/120
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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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Waleed Ahmed 26 - Feb - 2023 10 Min 00 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 special theory of relatively treats the problems involving:	A. Inertial frames of reference B. Non-inertial frames C. Non-accelerated frame D. Botha (A) and (C)
2	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
3	Which of the following is not an example of intertial frame	A. a body placed on the surface of earth B. a body placed in a car moving with uniform velocity C. a body placed in a car moving with same acceleration D. none of these
4	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
5	A high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one of them
6	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
7	When low energy photon interact with a metal,which of the following effect is likely to be taken place	A. pair production B. photoelectric C. Compton effect D. None of these
8	The value of threshold frequency for different metals is	A. different B. same C. may be different or may be same D. none of these
9	The emission of electrons from a metal surface when exposed to light of suitable frequency is called the	A. pair production B. Compton effect C. photoelectric effect D. relativity
10	According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body	A. Remains constant B. Decreases C. Increases to infinity D. Reduced to zero

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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

Position was discovered by Carl Anderson in

The value of threshold frequency for different metals is

The length contraction happens only

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

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

Electromagnetic -radiation means:

Compton shift refers to:

The idea of quantization of energy was proposed by:

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

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

Compton studied the scattering of x-rays by loosely bound electrons from:

Wave nature of particle was proposed by

The concept of direction is purely:

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

Photoelectrons are emitted when ultraviolet light falls on:

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

The mass of an object will be doubled at speed

In the compton's effect, it is found that the wavelength of incident x-rays is

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

When a platinum wire is heated, it appears yellow at

de-Broglies hypthesis was experimentally verified by

Strictly speaking, the earth is:

Which of the following is not an example of intertial frame

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

Absolute motion cannot be detected

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

The unit of work function is:

Converse of pair production is known as

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

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

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ECAT Physics Chapter 19 Important MCQ's

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