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

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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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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 existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
2	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well
3	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
4	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
5	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
6	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
7	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
8	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	A. 1.66 m B. 1.0 m C. 0.66 m D. 2.66 m
9	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
10	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}

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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

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

Momentum is a parameter associated with

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

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

The positron was discovered by:

Absolute motion cannot be detected

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

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

When a position comes close to an electron they annihilate into

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:

Pair production is the phenomenon in which

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

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

The inside cavity of the black body is

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

The photon of radio-waves has energy of about

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

the dilation of time applies to the timing processes which are:

G.P. Thomson observer experimentally that electrons and neutrons possess

A black body is

The year when A.H. compton was awarded Nobel Prize is:

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Photoelectric effect takes place with a photon of:

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

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

The value of threshold frequency for different metals is

In photoelectric effect the energy of ejected electrons depend on

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

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

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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