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	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
2	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
3	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
4	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
5	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
6	The value of threshold frequency for different metals is	A. different B. same C. may be different or may be same D. none of these
7	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always
8	An intertial frame of reference is a frame of reference which is	A. at rest B. moving with uniform velocity C. either at rest or moving with uniform velocity D. none of these
9	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
10	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal

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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

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

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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

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

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

The special theory of relativity is based on the

The concept of direction and position are purely

In photoelectric effect the energy of ejected electrons depend on

The value of threshold frequency for different metals is

Photocell is a device which converts

The length contraction happens only

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

Electromagnetic -radiation means:

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

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

The mass of an object will be doubled at speed

G.P. Thomson observer experimentally that electrons and neutrons possess

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

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

From the theory of relativity, momentum p of the photon is related to energy as

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

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

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

A photon is considered to have

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

The energy of a photon is represented by

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

There is no way to detect:

The concept of direction is purely:

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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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: