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	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
2	The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is	A. 100 J B. 1.6 x 10^-17J C. 100 eV D. 1.6 x 10^-17eV
3	When the atomic particle are moving with velocities approaching that of light:	A. Newton's laws become valid B. Relativistic effects become prominent C. Botha(A) and (B) are valid D. Neither (A)nor (B)
4	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
5	Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as	A. ON switch B. off switch C. function switch D. none of these
6	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
7	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
8	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
9	The photon of radio-waves has energy of about	A. 1 Me V B. 1 Ke v C. 10^-10e v D. 10¹⁰e v
10	According to Einstein, with the great increase in the speed of the body the relativistic length of the body	A. Remains constant B. Decreases C. Increases D. Reduces 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 photon of radio-waves has energy of about

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

the symbol to be used in relativity problems denotes:

Wave nature of particle was proposed by

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

When platinum wire is heated, it appears cherry red at

The existence of position was predicted by Dirace in

Wien's constant is measured in:

Electromagnetic -radiation means:

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

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

In photoelectric effect the energy of ejected electrons depend on

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

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

According to the special theory of relativity, time is

Pair production is the phenomenon in which

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

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

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

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

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

The special theory of relatively treats the problems involving:

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

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

Davision and Germer performed experiment to verify

Compton was awarded Nobel prize in physics in

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

A black body is

Which of the following is not an example of intertial frame

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ECAT Physics Chapter 19 Important MCQ's

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