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	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
2	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
3	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
4	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
5	The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as	A. classical mechanics B. Newtonian mechanics C. quantum mechanics D. statistical mechanics
6	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
7	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
8	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
9	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
10	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

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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

When a position comes close to an electron they annihilate into

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

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

The special theory of relativity treats problems invoving

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

A photon is considered to have

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

An inertial frame is that frame in which

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

A black body is

The special theory of relatively treats the problems involving:

The general theory of relativity treats problems involving

The positron was discovered by:

The energy of the 4th orbit in hydrogen atom is

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

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

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

The Stephen-Boltzmann law for the black body radiation is given by

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

Strictly speaking, the earth is:

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

Victor de-Brogile received the Nobel prize in physics in

At the temperature, a body emits radiation which is principally

Electromagnetic radiation or photons interact with matter in

The photon of radio-waves has energy of about

According to the special theory of relativity

Photoelectric effect takes place with a photon of:

According to the special theory of relativity, a moving clock

The value of the Stephen's constant for black body radiations is given by

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