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	At the temperature, a body emits radiation which is principally	A. of long wavelengths in the visible region B. of long wavelengths in the invisible infrared region C. of short wavelength in invisible ultraviolet region D. none of these
2	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
3	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
4	The nature of radiations emitted by a hot body depends upon its:	A. Metarial B. Temperature C. colour D. Volume
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	Due to relative motion of observer and the frame of reference of events, time always:	A. Dilates itself B. Contracts itself C. Stretches itself D. Both (A) and (C)
7	There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as	A. maximum frequency B. minimum frequency C. threshold frequency D. all of these
8	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
9	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
10	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

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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

Practically the quantity v/c is always:

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

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

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

The special theory of relativity treats problems invoving

A photon is considered to have

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

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

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

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

Position was discovered by Carl Anderson in

According to the special theory of relativity, a moving clock

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Momentum is a parameter associated with

0.1 kg mass will be equivalent to the energy

Electromagnetic -radiation means:

The energy of the 4th orbit in hydrogen atom is

The energy of photon 'E' is proported to

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

When platinum wire is heated, it appears cherry red at

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:

When a platinum wire is heated, it appears white at

According to the special theory of relativity, time is

Strictly speaking, the earth is:

The positron was discovered by:

In photoelectric effect the energy of ejected electrons depend on

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

Photocell is a device which converts

Electromagnetic radiation or photons interact with matter in

the symbol to be used in relativity problems denotes:

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