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 unit of work function is:	A. Joule B. Electron volt C. That of threshold frequency D. Both (A) and (B)
2	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
3	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²
4	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
5	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
6	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
7	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
8	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
9	In photoelectric effect the energy of ejected electrons depend on	A. The frequency B. The intensity C. Both frequency and intensity D. None of these
10	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well

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

The special theory of relatively treats the problems involving:

The energy of photon 'E' is proported to

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

Which of the following is not an example of intertial frame

According to the special theory of relativity, a moving clock

the symbol to be used in relativity problems denotes:

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

Which of the following phenomenon proves the particle nature of light

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

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

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

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

Pair production is the phenomenon in which

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

Converse of pair production is known as

The photon of radio-waves has energy of about

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

Position was discovered by Carl Anderson in

Compton shift refers to:

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

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

The value of threshold frequency for different metals is

The mass of an object will be doubled at speed

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

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

Victor de-Brogile received the Nobel prize in physics in

The general theory of relativity treats problems involving

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

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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ECAT Physics Chapter 19 Important MCQ's

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