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	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
2	The concept of direction and position are purely	A. absolute B. relative C. absolute or relative D. none of these
3	There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as	A. maximum frequency B. minimum frequency C. threshold frequency D. all of these
4	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
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	When low energy photon interact with a metal,which of the following effect is likely to be taken place	A. pair production B. photoelectric C. Compton effect D. None of these
7	Photocell is a device which converts	A. chemical energy into electrical energy B. electrical energy into light energy C. heat energy into electrical energy D. light energy into electrical energy
8	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
9	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
10	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

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

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

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

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

The photon of radio-waves has energy of about

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

When platinum wire is heated, it appears cherry red at

Compton shift refers to:

In the compton's effect, it is found that the wavelength of incident x-rays is

The inside cavity of the black body is

Davision and Germer performed experiment to verify

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Strictly speaking, the earth is:

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

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

Photoelectric effect takes place with a photon of:

Wien's constant is measured in:

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Momentum is a parameter associated with

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

the dilation of time applies to the timing processes which are:

The concept of direction is purely:

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

The mass of an object will be doubled at speed

Which of the following phenomenon proves the particle nature of light

The energy of photon 'E' is proported to

The positron was discovered by:

Pair production is the phenomenon in which

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

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ECAT Physics Chapter 19 Important MCQ's

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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes: