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

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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	G.P. Thomson observer experimentally that electrons and neutrons possess	A. particle-like properties B. wave-like properties C. neither particle nor wave like properties D. none of these
2	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	A. 2.9 s B. 3.0 s C. 6.6 s D. 9.6 s
3	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
4	Strictly speaking, the earth is:	A. An accelerated frame of reference B. A non-inertial frame of reference C. An inertial frame of reference D. ^{A non-accelerated frame of reference}
5	0.1 kg mass will be equivalent to the energy	A. 9 x 10¹⁵J B. 5 x 10⁸J C. 6 x 10¹⁶J D. 9 x 10^-16J
6	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
7	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
8	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
9	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
10	Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of	A. photoelectric effect B. pair production C. Compton effect D. uncertainty principle

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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

At the temperature, a body emits radiation which is principally

The energy of photon 'E' is proported to

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

The value of threshold frequency for different metals is

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

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

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

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

Compton shift refers to:

Wave nature of particle was proposed by

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

The inside cavity of the black body is

Momentum is a parameter associated with

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

The idea of quantization of energy was proposed by:

Intensity of light determines the:

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Compton studied the scattering of x-rays by loosely bound electrons from:

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

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

Electromagnetic radiation or photons interact with matter in

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

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

Position was discovered by Carl Anderson in

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

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

The special theory of relativity is based on:

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

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

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