Home » Quiz Bank

Quiz Bank

What happens when two waves interfere?

Interference is the process of superposition of two waves having same wavelength ,amplitude and frequency.When the waves interfere,there is no loss of energy.During constructive interference ,the two waves are added up to give a resultant wave of large amplitude.During destructive interference ,the two waves having same wavelength and amplitude arrive out of phase and cancel each other’s effect.At the point ...

Read More »

Difference between plane wave and spherical wave with examples

Plane waves In a plane wave disturbances travel in single direction. Plane waves examples For example when a string is fixed at both ends and the string is plucked at one end ,then transverse waves are generated in the string in which particles of the medium vibrate in one direction.So the transverse waves are plane waves.It is not possible in ...

Read More »

uses of damping devices in machinery

The damping devices are often used on machinery to increase the damping and reduce the vibrational effects caused due to running of machinery.These vibrational effects disturb the whole assembly and the building in which the machinery is working.The vibrational frequency of the machinery may cause the vibrations of large amplitude.To avoid this disturbance ,the damping devices are often used on ...

Read More »

difference between astronomical telescope and galilean telescope

Comparison table :                   Astronomical telescope     Galilean telescope 1:In an astronomical telescope the eye piece is a convex lens. 1:In Galilean telescope the eye piece is concave lens. 2:It forms an inverted image. 2:It forms an erect image. 3:The length  of astronomical telescope is: L =f0   + fe   ...

Read More »

difference between microscope and telescope

Difference table between microscope and telescope:     Microscope      Telescope                                                                                                 ...

Read More »

How can you determine the polarity of unlabeled magnet?

The polarity of an unlabelled magnet is determined by following methods. First method: Suspend the magnet freely with the help of a thread so that it can oscillate freely.When magnet comes to rest ,one end always points towards the northern end of the earth.This end of magnet is thus called the North pole.Similarly,the other end of the magnet pointing towards ...

Read More »

What is the difference between emf and potential difference?

Electromotive force The emf is the energy supplied to unit charge by the cell or battery. It is also defined as “the potential difference between the terminals of a battery when no current is flowing through an external circuit when the circuit is open. Potential difference The voltage across the terminals of the battery when the current is being drawn ...

Read More »

do electron tend to go to regions of high potential or low potential?

Electrons are negatively charged particles.When placed in an electric field ,negatively charged plate will repel them while positively charged plate will attract them.So,the electrons will move from negatively charged plate to positively charged plate.Since positively charged plate is at higher potential,while negatively charged plate is at lower potential.Therefore electrons tend to go from region of lower potential to a region ...

Read More »

Why is the electron volt often a more convenient unit of energy than a joule?

Both electron volt and joule are the units of energy.Since energies at atomic level are very small and are expressed in electron volt rather than Joule because Joule is a bigger unit.Hence the unit electron volt for energy is more convenient than joule,when we are dealing with atoms and nuclei to express the energy.  

Read More »

Difference between gas turbine and steam turbine

Idea of gas turbine is very old one,its working principle is an advanced version of wind mill.To achieve efficient working of turbine,the movement of  gas is controlled and directed to blades.The air which is under pressure supplied to turbine by air compressor. In gas turbine initially the air is obtained from atmosphere and compressed in air compressor.The air which is ...

Read More »