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

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ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
2	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
3	The concept of direction and position are purely	A. absolute B. relative C. absolute or relative D. none of these
4	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C
5	If a body reaches a speed equal to the speed of light, then its mass will became	A. zero B. very small C. infinity D. none of these
6	Pair production is the phenomenon in which	A. matter is converted into energy B. energy is converted into matter C. light is converted into electrical energy D. electrical energy is converted into light
7	Newton's law of motion do not hold in	A. an accelerated frame of reference B. an unaccelerated frame of reference C. both of these D. none of these
8	The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be	A. 500 m B. 500 nm C. 500 km D. 500 cm
9	Position was discovered by Carl Anderson in	A. 1920 B. 1925 C. 1928 D. 1932
10	The Nobel Prize on the explanation of photoelectric effect was awarded to:	A. Max. Planck B. Maxwell C. Bohr D. Rutherford

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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

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

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

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

In photoelectric effect the energy of ejected electrons depend on

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

Photoelectric effect takes place with a photon of:

A black body is

Compton was awarded Nobel prize in physics in

Newton's law of motion do not hold in

The length contraction happens only

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

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

The mass of an object will be doubled at speed

According to the special theory of relativity

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

There is no way to detect:

An intertial frame of reference is a frame of reference which is

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

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

Absolute motion cannot be detected

The special theory of relativity treats problems invoving

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

According to the special theory of relativity, time is

The unit of work function is:

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

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

According to the de-Brogile relation, an object of large mass and ordinary speed has

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:

Wien's constant is measured in:

When a position comes close to an electron they annihilate into

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ECAT Physics Chapter 19 Important MCQ's

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