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

Top Scorers Of ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQ`s Test

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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	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
2	A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is	A. 1.66 m B. 1.66 x 10^-10m C. 1.66 x 10^-29cm D. 1.66 x 10^-29m
3	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
4	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
5	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
6	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
7	Newton's law of motion do not hold in	A. an accelerated frame of reference B. an unaccelerated frame of reference C. both of these D. none of these
8	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
9	An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is	A. 1.66 x 10^-29m B. 1.74 x 10^-10cm C. 17.4 x 10^-6m D. 1.74 x 10^-10m
10	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935

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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

Absolute motion cannot be detected

The special theory of relativity is based on the

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

Position was discovered by Carl Anderson in

Strictly speaking, the earth is:

The special theory of relativity treats problems invoving

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

The idea of quantization of energy was proposed by:

There is no way to detect:

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

0.1 kg mass will be equivalent to the energy

A black body is

Intensity of light determines the:

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

The general theory of relativity treats problems involving

When a platinum wire is heated, it appears yellow at

The concept of direction is purely:

According to the Max plank, energy is redialed or absorbed in

The special theory of relativity is based on:

The concept of direction and position are purely

Compton shift refers to:

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

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

Due to relative motion of observer and the frame of reference of events, time always:

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

An inertial frame is that frame in which

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

When a platinum wire is heated, it appears white at

The mass of an object will be doubled at speed

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

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Top Scorers Of ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQ`s Test

ECAT Physics Chapter 19 Important MCQ's

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