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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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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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	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
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	According to the special theory of relativity	A. mass and energy are same entities B. mass and energy are same entities but interconverible C. mass and energy are different entities but interconverible D. mass and energy are different entities but non-interconveritble
4	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
5	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
6	The special theory of relativity treats problems invoving	A. inertial frame of references B. accelerating frame of references C. both of these D. none of these
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	A non-inertial frame of reference is one, in which	A. law of inertial is valid B. all laws of physics are the same in all frames C. a>0 or a<0 D. a=0
9	The unit of work function is:	A. Joule B. Electron volt C. That of threshold frequency D. Both (A) and (B)
10	The mass of an object will be doubled at speed	A. 1.6 x 10⁸ms^-1 B. 2.6 X 10⁸ms^-1 C. 2.6 x 10⁷ms^-1 D. 2.6 x 10⁹ms^-1

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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

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

When a position comes close to an electron they annihilate into photons such that

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

The concept of direction is purely:

The value of threshold frequency for different metals is

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

The special theory of relativity is based on:

When platinum wire is heated, it appears cherry red at

Wien's constant is measured in:

The inside cavity of the black body is

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

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

The unit of work function is:

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

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

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

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

S.I. unit of planks constant is

Photoelectric effect takes place with a photon of:

The idea of quantization of energy was proposed by:

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

Which of the following phenomenon proves the particle nature of light

When a position comes close to an electron they annihilate into

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

The energy of photon 'E' is proported to

As the light shines on the metal surface, the electrons are ejected

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

Electromagnetic radiation or photons interact with matter in

Intensity of light determines the:

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