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 studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal
2	When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called	A. thermoionic electrons B. free electrons C. photoelectrons D. slow electrons
3	The photoelectric effect, the maximum energy of photoelectrons depends on the	A. particular metal surface B. frequency of incident light C. both of them D. none of them
4	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
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 year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
7	The length contraction happens only	A. Opposite to the direction of motion B. along the direction of motion C. perpendicular to the direction of motion D. In any direction
8	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
9	An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is	A. 1.66 x 10^-29m B. 1.74 x 10^-10cm C. 17.4 x 10^-6m D. 1.74 x 10^-10m
10	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

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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

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

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

In photoelectric effect the energy of ejected electrons depend on

According to the special theory of relativity, time is

According to the special theory of relativity, a moving clock

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

Which one of the following physical quantities changes with relativistic speed

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

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

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Momentum is a parameter associated with

Photocell is a device which converts

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

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

Wien's constant is measured in:

Pair production is the phenomenon in which

Compton was awarded Nobel prize in physics in

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

The value of threshold frequency for different metals is

When a platinum wire is heated, it appears white at

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

The concept of direction and position are purely

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

Converse of pair production is known as

The value of the Stephen's constant for black body radiations is given by

An intertial frame of reference is a frame of reference which is

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

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

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

There is no way to detect:

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ECAT Physics Chapter 19 Important MCQ's

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The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be