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	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate
2	Victor de-Brogile received the Nobel prize in physics in	A. 1925 B. 1929 C. 1932 D. 1935
3	Davision and Germer performed experiment to verify	A. de-Brogile hypothesis B. theory of relativity C. Newton's law of gravitation D. Mass-energy relation
4	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²
5	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
6	If a material object moves with the speed of light 'C' its mass becomes	A. Equal to its rest mass B. Four times of its rest mass C. Double of its rest mass D. Infinite
7	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
8	Compton derived an expression to find compton shift by applying to the process, the law of conservation of:	A. Energy only B. Momentum only C. Mass only D. Charge only
9	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)
10	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

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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:

The idea of quantization of energy was proposed by:

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 mass of an object will be doubled at speed

At the temperature, a body emits radiation which is principally

A non-inertial frame of reference is one, in which

Converse of pair production is known as

the symbol to be used in relativity problems denotes:

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

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

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

An inertial frame is that frame in which

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

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

The value of the Stephen's constant for black body radiations is given by

The value of threshold frequency for different metals is

Intensity of light determines the:

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

Wien's constant is measured in:

According to the special theory of relativity, time is

The special theory of relativity treats problems invoving

The photon of radio-waves has energy of about

S.I. unit of planks constant is

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

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

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

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

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

The value of the plank's constant 'h' is given by

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

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