ozone is a molecule formed by how many atoms of oxygen

charge acquired by a glass rod when rubbed with silk cloth called

charge acquired by an ebonite rod when rubbed with woolen cloth are called

charge of one columb is

small unit of current is expressed in unit callled

A very small quantity of current is expressed in unit callled

Current flows from

Electrons flows from

Work done per unit time is

it is an elementary particle that define light

Bundle of light ray is called

the ray of light that falls on the mirror surface is called

The point at which incident ray falls on the mirror is called

The angle between incident ray and normal is called

The angle between the reflected ray and normal is called

The incidence ray , reflected ray and normal all lie on the same plane according to which law of reflection

the angle of reflection is always equal to the angle of incidence is according to which law of reflection

Image which can be obtained on screen

Image which can't be obtained on screen

It is a Spherical mirror whose whose reflection of light takes place at bent in surface

It is a Spherical mirror whose whose reflection of light takes place at bulging out surface

where is centre of curvature of concave mirror located

where is centre of curvature of convex mirror located

centre of Spherical mirror is called

Straight Line passing through centre of curvature and pole of Spherical mirror is called

The portion of mirror from which the reflection of light actually takes place is called

Focal length

magnetic effect of current was discovered by

magnetic effect of current was discovered by oersted in

It is a device which converts alternating current into direct current

Study of science of small structure called

when the temperature increase the electrical conductivity of a semi-conductor

Light is a form of energy which is propagated as

electromagnetic waves is

light behaves as

Speed of light was first measured by

light refracted from moon take

It is the ratio of speed of light in vaccum to the speed of light in medium

The region in which no light ray reaches

The region in which partial light reaches

when a ray of light enters from rarer medium to denser it

when a ray of light enters from rarer denser to rarer it

Whose law state that a given color of light , the ratio of sine of angle of incidence to the sine of angle of refraction is constant

whose law states that the force of gravitation attraction between two point bodies is directly proportional to the product of their mass and inversely proportional to the square of the distance between them

value of gravitation

value of gravity

gravity is maximum at

gravity is minimum at

If the lift is stationary or moving with uniform speed , the apparent weight of the body is

if lift is going up with acceleration the apparent weight of the body is

if lift is going down with acceleration the apparent weight of the body is

If the cord of lift is broken , it falls freely and the weight of body becomes

while going down if the acceleration of lift is more than acceleration due to gravity, a body in the lift goes

The orbital speed of satellite is

period of revolution of satellite revolving near the surface of earth is

escape velocity is also called

escape velocity of earth

escape velocity of moon

when a body travels along a circular path , its velocity changes continuously an external force acts on the body towards the centre is called

Centripetal force formula

external force acts on a body outwards the centre while moving the circular path

centrifugal force is also called

The rotational effect of a force On a body above an axis of rotation is called

moment of force is a

Ejection of an electron from the surface of matter is called

how many types of Electron emission are there

The process in which electron Emission is done by applying a strong electric field across the metal surface

It is the Electron emission when highly energetic electron beam is incident on a metal surface

This electron Emission is done by illuminating the metal surface with light of suitable frequency

diode valve is designed by

diode valve is designed in

It is an electric component that allows electric current to flow in only one direction

It is a device which converts alternating voltage in direct voltage

Collection of electons is called

Triode valve is designed by

Triode valve is designed in

Those material whose Electrical conductivity at room temperature lies between insulator and conductor

semi conductor are of how many types

A semi-conductor of an extremely pure form is known as

If a small and measured amount of chemical impurity is added to intrinsic semi-conductor,it is called

Extrinsic semi-conductor is of how many types

An extrinsic semi-conductor in which electrons are majority charge carrier made by doing a pure semi conductor with pertavalent impurity

An extrinsic semi-conductor in which holes are the majority charge carrier made by doping pure semi-conductor with trivalent impurity

Adding of chemical impurity to a pure semi conductor

Electrical conductivity of a semi-conductor increases with

Study of science of small structure called

Beam of high energy electons

What revolves around the nucleus

Cathode ray travel with what velocity

Source of Emf used in the production of cathode rays is

Canal rays or anode rays are discovered by

Rays emitted by radioactivity were first recognised by

the end product of all natural radioactive element after emission of radioactive Rays is

With the emission of what atomic number is decreased by 2 and mass number by 4

With the emission of what Atomic number increase by One and mass does not change

Effect on the mass number and atomic number with the emission of A,B,&Y rays is decided by

Radioactivity is detected by

It is used to detect the presence & kinetic energy of radioactive particles

Cloud chamber was discovered by

It is an arrangement in which controlled nuclear fission reaction takes place