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	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
2	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
3	The value of the plank's constant 'h' is given by	A. 1.6 x 10^-19J B. 1.67 x 10^-27Kg C. 6.63 x 10³⁴Js D. 6.63 x 10^-34Js
4	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)
5	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
6	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
7	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
8	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules
9	According to the Max plank, energy is redialed or absorbed in	A. discrete packets B. continuous waves C. either of them D. none of these
10	When a high energy photon interact with a metal, which of the following effect is most likely to be taken place	A. pair production B. photoelectric effect C. Compton effect 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

The idea of quantization of energy was proposed by:

Wave nature of particle was proposed by

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

The Nobel Prize on the explanation of photoelectric effect was awarded to:

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

When a position comes close to an electron they annihilate into

The special theory of relativity treats problems invoving

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

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

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

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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

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

The special theory of relatively treats the problems involving:

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

The energy of photon 'E' is proported to

The value of threshold frequency for different metals is

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

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

S.I. unit of planks constant is

Electromagnetic radiation or photons interact with matter in

When a platinum wire is heated, it appears yellow at

There is no way to detect:

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

According to the special theory of relativity, time is

The photon of radio-waves has energy of about

Pair production is the phenomenon in which

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

The concept of direction is purely:

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Top Scorers Of ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQ`s Test

ECAT Physics Chapter 19 Important MCQ's

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The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be