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	The general theory of relativity treats problems involving	A. inertial frame of references B. accelerating frame of references C. both of these D. none of these
2	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
3	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
4	If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers	A. larger B. shorter C. equal D. none of these
5	According to the special theory of relativity, a moving clock	A. runs faster B. runs slower C. neither runs faster nor slower D. all of these
6	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal
7	Compton derived an expression to find compton shift by applying to the process, the law of conservation of:	A. Energy only B. Momentum only C. Mass only D. Charge only
8	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these
9	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
10	Max Planck received the Nobel Prize for his discovery of energy quants in:	A. 1718 AD B. 1918 AH C. 1818 AD D. 1918 AD

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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 energy of the 4th orbit in hydrogen atom is

A particle having mass and charge equal to that of an electron is called:

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

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

The inside cavity of the black body is

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

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

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

Absolute motion cannot be detected

The photon of radio-waves has energy of about

The nature of radiations emitted by a hot body depends upon its:

S.I. unit of planks constant is

Practically the quantity v/c is always:

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

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

When a platinum wire is heated, it appears orange red at

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

Compton was awarded Nobel prize in physics in

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

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

The special theory of relativity is based on the

If a body reaches a speed equal to the speed of light, then its mass will became

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

The energy of photon 'E' is proported to

At the temperature, a body emits radiation which is principally

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

When a platinum wire is heated, it appears white at

Pair production is the phenomenon in which

The concept of direction is purely:

According to the special theory of relativity

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ECAT Physics Chapter 19 Important MCQ's

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