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	With the help of 50 K v electron microscope, a resolution of	A. 0.5 to 1 m to possible B. 1 m to 10 m is possible C. 0.5 to 1 nm is possible D. 1 to 10 nm is possible
2	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
3	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
4	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate
5	In photoelectric effect the energy of ejected electrons depend on	A. The frequency B. The intensity C. Both frequency and intensity D. None of these
6	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
7	When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called	A. thermoionic electrons B. free electrons C. photoelectrons D. slow electrons
8	In the compton's effect, it is found that the wavelength of incident x-rays is	A. greater than the wavelength of scattered x-rays B. equal to the wavelength of scattered x-rays C. less than the wavelength of scattered x-rays D. any one of these
9	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
10	The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes	A. 2 mo B. 1.67 mo C. 0.67 mo D. 2.67 mo

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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

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

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

When a platinum wire is heated, it appears yellow at

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

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

From the theory of relativity, momentum p of the photon is related to energy as

The photon of radio-waves has energy of about

An inertial frame is that frame in which

Photoelectric effect takes place with a photon of:

The inside cavity of the black body is

The length contraction happens only

The unit of work function is:

With the help of 50 K v electron microscope, a resolution of

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

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

The positron was discovered by:

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

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

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

According to the special theory of relativity, time is

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

In process of annihilation of matter, the two photons produced move in opposite direction to converse

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

The idea of quantization of energy was proposed by:

Strictly speaking, the earth is:

The concept of direction and position are purely

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

de-Broglies hypthesis was experimentally verified by

Converse of pair production is known as

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ECAT Physics Chapter 19 Important MCQ's

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