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	Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of	A. photoelectric effect B. pair production C. Compton effect D. uncertainty principle
2	In the compton's effect, it is found that the wavelength of incident x-rays is	A. greater than the wavelength of scattered x-rays B. equal to the wavelength of scattered x-rays C. less than the wavelength of scattered x-rays D. any one of these
3	When a high energy photon interact with a metal, which of the following effect is most likely to be taken place	A. pair production B. photoelectric effect C. Compton effect D. None of these
4	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
5	The unit of work function is:	A. Joule B. Electron volt C. That of threshold frequency D. Both (A) and (B)
6	The emission of electrons from a metal surface when exposed to light of suitable frequency is called the	A. pair production B. Compton effect C. photoelectric effect D. relativity
7	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
8	Victor de-Brogile received the Nobel prize in physics in	A. 1925 B. 1929 C. 1932 D. 1935
9	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
10	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

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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 photoelectric effect, the maximum energy of photoelectrons depends on the

According to the special theory of relativity, time is

Absolute motion cannot be detected

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

Compton shift refers to:

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

A black body is

When a platinum wire is heated, it appears dull red at about

Pair production is the phenomenon in which

A photon is considered to have

Electromagnetic -radiation means:

Photoelectrons are emitted when ultraviolet light falls on:

The energy of a photon is represented by

The special theory of relativity treats problems invoving

An inertial frame is that frame in which

Photoelectric effect takes place with a photon of:

The mass of an object will be doubled at speed

In process of annihilation of matter, the two photons produced move in opposite direction to converse

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

Wien's constant is measured in:

With the help of 50 K v electron microscope, a resolution of

de-Broglies hypthesis was experimentally verified by

Compton was awarded Nobel prize in physics in

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

The unit of work function is:

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

Victor de-Brogile received the Nobel prize in physics in

At the temperature, a body emits radiation which is principally

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

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

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ECAT Physics Chapter 19 Important MCQ's

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