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

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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 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
2	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
3	Which of the following is not an example of intertial frame	A. a body placed on the surface of earth B. a body placed in a car moving with uniform velocity C. a body placed in a car moving with same acceleration D. none of these
4	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
5	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
6	A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is	A. 1.66 m B. 1.66 x 10^-10m C. 1.66 x 10^-29cm D. 1.66 x 10^-29m
7	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
8	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
9	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules
10	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one 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

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

The energy of a photon is represented by

The general theory of relativity treats problems involving

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

Practically the quantity v/c is always:

Photoelectrons are emitted when ultraviolet light falls on:

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

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Intensity of light determines the:

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

Momentum is a parameter associated with

The existence of position was predicted by Dirace in

Electromagnetic -radiation means:

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

At the temperature, a body emits radiation which is principally

The length contraction happens only

When a platinum wire is heated, it appears dull red at about

In photoelectric effect the energy of ejected electrons depend on

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

When a platinum wire is heated, it appears white at

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

According to the special theory of relativity

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

Victor de-Brogile received the Nobel prize in physics in

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

The energy of the 4th orbit in hydrogen atom is

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

The mass of an object will be doubled at speed

A photon is considered to have

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

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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: