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	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
2	The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of	A. 2 cm/s B. 20 cm/s C. 200 cm/s D. 2000 cm/s
3	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
4	There is no way to detect:	A. Absolute uniform motion B. Accelerated motion C. State rest D. State of motion
5	A non-inertial frame of reference is one, in which	A. law of inertial is valid B. all laws of physics are the same in all frames C. a>0 or a<0 D. a=0
6	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
7	Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of	A. photoelectric effect B. pair production C. Compton effect D. uncertainty principle
8	The value of the Stephen's constant for black body radiations is given by	A. 5.6 x 10⁸Wm^-2K^-4 B. 5.67 x 10^-8Wm^-2K^-4 C. 2.9 x 10^-3mK D. 2.9 x 10³mK
9	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
10	The photoelectric effect, the maximum energy of photoelectrons depends on the	A. particular metal surface B. frequency of incident light C. both of them D. none of them

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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

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

There is no way to detect:

The energy of the 4th orbit in hydrogen atom is

The positron was discovered by:

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

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

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

The value of threshold frequency for different metals is

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

Electromagnetic -radiation means:

Pair production is the phenomenon in which

the symbol to be used in relativity problems denotes:

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

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Which of the following is not an example of intertial frame

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:

In photoelectric effect the energy of ejected electrons depend on

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

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

The special theory of relativity is based on the

The idea of quantization of energy was proposed by:

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

Photocell is a device which converts

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

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

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

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

The energy of a photon is represented by

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

In order to produce pair production, a photon must have a energy

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ECAT Physics Chapter 19 Important MCQ's

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