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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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	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)
2	At the temperature, a body emits radiation which is principally	A. of long wavelengths in the visible region B. of long wavelengths in the invisible infrared region C. of short wavelength in invisible ultraviolet region D. none of these
3	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
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	There is no way to detect:	A. Absolute uniform motion B. Accelerated motion C. State rest D. State of motion
6	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
7	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
8	If a material object moves with the speed of light 'C' its mass becomes	A. Equal to its rest mass B. Four times of its rest mass C. Double of its rest mass D. Infinite
9	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
10	A high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one of them

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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

Wave nature of particle was proposed by

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

The unit of work function is:

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

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

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

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

A photon is considered to have

Compton shift refers to:

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

G.P. Thomson observer experimentally that electrons and neutrons possess

Practically the quantity v/c is always:

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

An inertial frame is that frame in which

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

A non-inertial frame of reference is one, in which

Newton's law of motion do not hold in

Photoelectric effect takes place with a photon of:

The idea of quantization of energy was proposed by:

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

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 the

The special theory of relatively treats the problems involving:

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

If a material object moves with the speed of light 'C' its mass becomes

When a platinum wire is heated, it appears yellow at

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

The length contraction happens only

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

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ECAT Physics Chapter 19 Important MCQ's

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