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

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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	When a position comes close to an electron they annihilate into photons such that	A. each photon has energy 0.51 Me v B. each photon has energy 1.02 Me v C. each photon has energy 0.25 Me v D. none of these
2	According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the	A. number of photoelectrons B. size of the photoelectrons C. charge on photoelectrons D. K.E of photoelectrons
3	Victor de-Brogile received the Nobel prize in physics in	A. 1925 B. 1929 C. 1932 D. 1935
4	The existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
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	From the theory of relativity, momentum p of the photon is related to energy as	A. p = hfc B. p = hf/c C. p = f(hc,f) D. p = cf/h
7	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
8	An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is	A. 1.66 x 10^-29m B. 1.74 x 10^-10cm C. 17.4 x 10^-6m D. 1.74 x 10^-10m
9	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
10	According to the special theory of relativity, a moving clock	A. runs faster B. runs slower C. neither runs faster nor slower D. all 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

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

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

According to the special theory of relativity, time is

Wave nature of particle was proposed by

0.1 kg mass will be equivalent to the energy

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

Electromagnetic -radiation means:

A particle having mass and charge equal to that of an electron is called:

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

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

The special theory of relativity is based on:

When a platinum wire is heated, it appears yellow at

Photocell is a device which converts

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

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

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

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

There is no way to detect:

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

At the temperature, a body emits radiation which is principally

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

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

When a platinum wire is heated, it appears white at

The concept of direction is purely:

The existence of position was predicted by Dirace in

Converse of pair production is known as

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

The special theory of relativity is based on the

When low energy photon interact with a metal,which of the following effect is likely to be taken place

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

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ECAT Physics Chapter 19 Important MCQ's

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