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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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	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
2	The Nobel Prize on the explanation of photoelectric effect was awarded to:	A. Max. Planck B. Maxwell C. Bohr D. Rutherford
3	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)
4	If a body reaches a speed equal to the speed of light, then its mass will became	A. zero B. very small C. infinity D. none of these
5	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
6	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
7	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
8	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
9	When low energy photon interact with a metal,which of the following effect is likely to be taken place	A. pair production B. photoelectric C. Compton effect D. None of these
10	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either 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

The energy of photon 'E' is proported to

The Einstein's changes in length, mass and time are not observed in common life because

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

Davision and Germer performed experiment to verify

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

An intertial frame of reference is a frame of reference which is

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

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

The energy of the 4th orbit in hydrogen atom is

Electromagnetic -radiation means:

Converse of pair production is known as

The concept of direction is purely:

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

According to the special theory of relativity, a moving clock

The photon of radio-waves has energy of about

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

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

Victor de-Brogile received the Nobel prize in physics in

The inside cavity of the black body is

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

Position was discovered by Carl Anderson in

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

The mass of an object will be doubled at speed

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

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

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Photoelectrons are emitted when ultraviolet light falls on:

The special theory of relativity treats problems invoving

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

An inertial frame is that frame in which

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ECAT Physics Chapter 19 Important MCQ's

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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes: