Biology 6

ജീവശാസ്ത്രത്തിലെ കണ്ണ്, ചെവി എന്നിവയുമായി ബന്ധപ്പെട്ട ചോദ്യങ്ങളാണ് ഇന്നത്തെ പാഠത്തിൽ

• Study of eyes and eye diseases

                 Ophthalmology

• Outer layer of eyes

                 Schlera

• Middle layer of eyes

                 Choroid

• Inner layer of eyes

                 Retina

• Layer of eyes which supplies nutritions

                 Choroid

• Circular transparent front portion of eyes

                 Cornea

• Lens in eyes

                 Biconvex lens

• Image formed on the retina of eyes is

                 Real and inverted

• For normal eyes near point is 

                 25 cm

• Thin covering that protects cornea

                 Conjunctiva

• Curtain like partition behind cornea

                 Iris

• Opening at the centre of Iris

                 Pupil

• Portion that controls the light enters eye

                 Pupil

• Which is regulating the size of pupil in eyes

                 Iris

• Light sensitive layers are present in which layer

                 Choroid

• Ability of eyelens to adjust its focul length is known as

                 Power of accomodation

• Cells responsible for dim light vision

                 Rods

• Cells responsible for Bright light vision and color vision

                 Cone cells

• Owls cannot see during day time due to the absence of 

                 Cone cells

• Point where no rod and cone cells are present and no image formation happening

                 Blind spot

• Name of the pigment that helps to see in dimlight

                 Rhodopsin

• Light sensitive pigment of rod cells 

                 Rhodopsin

• Light sensitive pigment of cone cells 

                 Iodopsin

• Jelly like substance filled in between lens and retina

                 Vitreous humor

• Fluid filled in between Iris and cornea

                 Aqueous humor

• Focal length of the lens is adjusted by\ligments that holds lens in place

                 Ciliary body

• Tear producing glands in eye

                 Lachrymal gland

• Enzyme present in tears

                 Lyzosyme

• Eye transplantation surgery includes

                 Cornea, Schlera and vitreous humor

• Cornea transplantation surgery is known as

                 Keratoplasty

• Short sight is also known as

                 Myopia

• In case of Myopia the image is formed at

                 In front of the retina

• Long sight is also known as

                 Hypermetropia

• In case of Hypermetropia the image is formed at

                 Behind the retina

• Presbyopia is caused by

                 eduction in elasticity of lens

• Situation in which image is not clearly formed due to irregular curvature of cornea

                 Astigmatism

• Squint eyes can be corrected by

                 Eye surgery

• Myopia can be corrected with

                 Concave lens

• Hypermetropia can be corrected with

                 Convex lens

• Both Myopia and hypermetropia can be corrected with

                 Bifocal lens

• Astigmatism can be corrected with

                 Cylindrical lens

• Color blindness was discovered by

                 John Dalton

• Person suffering from Color blindness unable to distinguish

                 Red and Green colors

• Eye diseases that occurs due to the deficiency of Vitamin A

                 Night blindness and Xerophthalmia

• Loss of vision in dim lights is called

                 Night blindness

• Eye diseases that occurs when iris become dry and opaque is called

                 Xerophthalmia

• Clouding of eyesdue to ageing

                 Cataract

• Eye diseases due to the increased pressure in the eye ball

                 Glaucoma

• Inflamation or infection of conjunctiva is called

                 Conjunctivitis or red eyes or Madras eye

• Organ which maintains the balance of the body

                 Ear

• Part of ear which helps hearing

                 Cochlea

• Semicircular canals, Vestibules, Pharynx etc are parts of

                 Ear

• Part of ear which has the shape of snail shell

                 Cochlea

• Instrument used for examining outer ear drum

                 Otoscope

• Hammer shaped bone in ear

                 Malleus

• Anvil shaped bone in ear

                 Incus

• Stirrup shaped bone in ear

                 Stapes

• Smallest bone in human body

                 Stapes
                                                                  (To be Continued...)

Chemistry 10

അമോണിയ, കാർബൺ ഡയോക്സൈഡ്, ഹാലൊജനുകൾ തുടങ്ങിയവയുമായി ബന്ധപ്പെട്ട ചോദ്യങ്ങളാണ് ഇന്നത്തെ പാഠത്തിൽ

• Which is called as Fools gold

                    Iron Pyrites

• Which is called as White gold

                    Platinum, Cashew nut

• Which is called as Flowing gold

                    Petroleum

• Which is called as Black gold

                    Petroleum, Pepper

• Which is called as Blue gold

                    Water

• Which is called as Green gold

                    Vanila

• Which is called as Blac diamond

                    Coal

• TNT stands for

                    Tri Nitro Toluene

• Acids used in manufacturing of TNT

                    Mixture of concentrated Nitric acid and sulphuric acid

• Ammonia is a compound of 

                    Nitrogen and Hydrogen (NH3)

• Process of manufacturing Ammonia industrially

                    Haber Process

• Catalyst used in Haber process

                    Iron

• Gaseous ammonia was first produced by 

                    Joseph Priestly

• Most soluble gas in water

                    Ammonia

• Only gas which shows alkaline nature

                    Ammonia

• Intermediate gaseous product formed in the decaying process of dead organisms

                    Ammonia

• Substance which is used as coolant in ice plants

                    Ammonia

• Substance which is used as coolant in refrigerators

                    Freon

• Acid which is used to identify ammonia

                    Nessler's reagent

• Color of ammonium chloride

                    White

• Major green house gases are

                    Carbon dioxide, Methane, Nitrous oxide

• Gas mainly causes global warming

                    Carbon dioxide

• Solid carbon dioxide is called as 

                    Dry Ice

• Gas which is released during the process of fermentation

                    Carbon dioxide

• Amount of Carbon dioxide in atmosphere

                    0.03%

• Gas which turns milk of lime milky

                    Carbon dioxide

• Gas used as fire extinguisher

                    Carbon dioxide

• Gas released due to the partial burning of substances

                    Carbon monoxide

• Gas present in soda water

                    Carbon dioxide

• The name Halogen means

                    Salt former

• Halogens which are extracted from sea water

                    Chlorine, Bromine, Iodine

• Element which is least metallic in nature

                    Fluorine

• Element which has highest reactivity or electro negativity

                    Fluorine

• Second most electro negative element

                    Oxygen

• Which is called as super halogen

                    Fluorine

• Which is called as synthetic halogen

                    Astatine

• Which is called as solid halogen

                    Iodine

• Which is called as pseudo halogen

                    Cyanogen

• Most abundant halide present in earth's crust

                    Fluoride

• Gas which is used for purifying water (using in swimming pools)

                    Chlorine

• Solvent used as an anaesthetic

                    Chloroform

• Compound of chlorine used in plastics

                    Poly Vinyl Chloride (PVC)

• Element used as a bleaching agent either in solid or liquid form

                    Chlorine

• Halogen which is present in liquid form in nature

                    Bromine

• Non metal that exists in liquid state at room temperature

                    Bromine

• Most commonly used halogen available as tablet

                    Iodine

• Element which is abundant in sea weeds

                    Iodine

• Color of carbohydrate in Iodine

                    Dark Blue

• Chemical used in photographic films

                    Silver bromide

• Substances using for artificial raining

                    Silver Iodide, Dry Ice

• Rarest element in earth

                    Astatine

• Heaviest known halogen

                    Astatine

• Lightest known halogen

                    Fluorine

• Gas responsible for Bhopal Gas tragedy

                    Methyl Isocyanate
                                                                                   (To be Continued...)

Chemistry 9

ഹൈഡ്രജൻ, ഓക്സിജൻ, നൈട്രജൻ, തുടങ്ങിയ വാതകങ്ങളുമായി ബന്ധപ്പെട്ട ചോദ്യങ്ങളാണ് ഇന്നത്തെ പാഠത്തിൽ

• Hydrogen was discovered by

                  Henry Cavendish

• Meaning of the word Hydrogen

                  Water producer

• Based on atomic mass which is the smallest atom

                  Hydrogen

• Which is considered as the simplest atom\lightest gas

                  Hydrogen

• Largest atom

                  Francium

• Densest atom

                  Radon

• Element which produces largest number of compounds

                  Hydrogen

• Non metal element which showing metalic characters

                  Hydrogen

• Element which is not included in any group

                  Hydrogen

• Element which is present in all acids

                  Hydrogen

• Element which has the second lowest boiling point and melting point among all substances

                  Hydrogen

• Gas which burns blue in color

                  Hydrogen

• Element that does not have neutrons in atom

                  Hydrogen

• Gas which is used for making Vanaspati ghee

                  Hydrogen

• Hydrogen is not using for domestic purpose because of its 

                  Explosive nature

• Fuel used in rockets

                  Liquid Hydrogen

• Which is known as fuel of future

                  Hydrogen

• Fuel which doesn't cause any pollution

                  Hydrogen

• Isotops of Hydrogen are

                  Protium, Deuterium, Tritium

• Which isotope of Hydrogen is considered as the ondinary Hydrogen

                  Protium

• Which is called as heavy Hydrogen

                  Deuterium

• Chemical name of Heavy water

                  Deuterium Oxide

• Chemical name of Super heavy water

                  Tritium Oxide

• Most abundant isotope of Hydrogen

                  Protium

• Simplest radio active element\Radio active isotope of Hydrogen

                  Tritium

• Isotops which are using for the manufacturing of Hydrogen bomb

                  Deuterium, Tritium

• Most abundant compound present in animals and human body

                  Water (About 65-70% of bodymass)

• Scientist who proved that water is a compound of Hydrogen and Oxygen

                  Henry Cavendish

• The matter which can exist in Solid, Liquid and gaseous forms

                  Water

• High boiling point of water is due to

                  Hydrogen bonding

• Which is known as universal solvent

                  Water

• Chemical name of water

                  Dihydrogen monoxide (H2O)

• Purest water in nature

                  Rain water

• Temporary hardness of water is due to the presence of 

                  Bicarbonates of Calcium and Magnesium

• Temporary hardness of water can be removed by

                  Repeated boiling or adding lime

• Permanent hardness of water can be removed by

                  Distillation or by adding Sodium Carbonate (Washing soda)

• Gas which has the smell of rotten eggs

                  Hydrogen Sulphide

• Compound of Hydrogen using as bleaching agent

                  Hydrogen peroxide (H2O2)

• Compound of Hydrogen which has the structure of an open book

                  Hydrogen peroxide

• Gas which helps substances to burn but doesn't burn itself

                  Oxygen

• Number of atoms present in Oxygen molecule

                  2

• Number of atoms present in Ozone molecule

                  3

• Hydrogen and Oxygen are named by

                  Lavoisier

• Gas which is colorless, tasteless and odourless

                  Oxygen

• Color of Oxygen and Ozone in solid and liquid form

                  Light Blue

• Atmospheric layer in which Ozone is present

                  Stratosphere

• Substance which deplete the Ozone layer

                  Chlorofluoro Carbon (CFC)

• Industrial name of CFC

                  Freon

• Element in CFC which destroys ozone 

                  Chlorine

• Gases used in aquatic lungs of sea divers for respiration

                  Mixture of Helium and Oxygen

• Nitrogen was discovered by

                  Daniel Rutherford

• Main content of protein

                  Nitrogen

• Examples of Nitrogen fixing bacterias

                  Rhizobium, Axetobacter, Clostridium

• Nitrogen compound which is used in photographic plates

                  Silver Nitrate

• Most nitrogenized fertilizer

                  Urea

• Gas formed in atmosphere during lightning

                  Nitrogen dioxide

• RDX stands for

                  Research Department Explosive

• Explosive known as cyclonite

                  RDX

• Explosive known as trotyl

                  TNT
                                                                                              (To be Continued...)

Chemistry 8

രസതന്ത്രത്തിലെ പ്രധാന പ്രക്രിയകൾ, കാർബൺ, ബോറോൺ, സൾഫർ, ഫോസ്ഫറസ് എന്നിവയുമായി ബന്ധപ്പെട്ട ചോദ്യങ്ങളാണ് ഇന്നത്തെ പാഠത്തിൽ

• Process of extracting Magnesium is called

                 Dow Process

• Process of extracting Sodium is called

                 Down's Process

• Process of industrial production of Hydrogen  is called

                 Bosch Process

• Production of Nitric acid is called

                 Ostwald Process

• Production of Noble metals is called

                 Cyanide Process

• Industrial production of Steel is called

                 Bessemer Process

• Production of Sulfuric acid is called

                 Contact Process

• Production of Chlorine Gas is called

                 Deacon's Process

• Production of Hard water is called

                 Girdler Sulphide Process

• Production of Ammonia is called

                 Haber Process

• Production of Sodium Carbonate is called

                 Solvey Process

• Process of extraction of salt from sea water is known as 

                 Evaporation

• Purification process of sea water is known as 

                 Distillation

• Which is known as the fundamental element of life

                 Carbon

• Examples of Crystalline carbon

                 Diamond, Graphite, Graphene, Fullerene

• Examples of Amorphous carbon

                 Coal, Coke, Charcoal, lamp black

• Most stable form of carbon

                 Graphite

• Non metal allotrope of carbon that conduct electricity

                 Graphite

• The substance which is known as black lead

                 Graphite

• Substance which is used to make lead pencils

                 Graphite

• Allotrope of carbon which is used as moderator in nuclear reactor

                 Graphite

• Ball shaped allotrope of carbon

                 Fullerene

• Allotrope of carbon which is used for purifying sugar, gas, water, gold etc

                 Charcoal

• Fuel used in blast furnace

                 Coke

• Diesel oil is produced by the hydrogenation of 

                 Coke

• Charcol perform purification by the process of 

                 Adsorption

• The process of accumulation of gas or liquid molecules on the surface is known as

                 Adsorption

• Ability of a substance to attract water molecules from surrounding environment is known as

                 Hygroscopy

• Hardest substance in Earth

                 Diamond

• Second hardest substance in Earth

                 Corundum

• Scale which is used to measure the hardness of Diamond

                 Mohs Scale

• Hardness of diamond

                 10 mohs

• Hardness of corundum

                 9 mohs

• Sunstance which has the highest melting point

                 Tungsten (3422° C)

• White powder which is used as polish in carrom board

                 Boric acid

• Acid which is used as an antiseptic and eye lotion

                 Boric acid

• Main component of stiff and shine which is used while washing clothes

                 Borax

• Compound of Boron which is having the same structure of benzene (Inorganic benzene)

                 Borozene

• Structure of benzene was discovered by

                 Keule

• Number of atoms present in Sulphur molecule

                 8

• Element which have no radio active isotop

                 Sulphur

• Gas which cause fading of color of Taj Mahal

                 Sulphur dioxide

• Gases which cause fading of Silver

                 Sulphur dioxide, Hydrogen sulphide

• Element which is known as enemy of Copper

                 Sulphur

• Allotrops of Sulphur

                 Monoclinic sulphur, Plastic sulphur, Rhombic sulphur

• Gases causing acid rain

                 Sulphur dioxide, Oxides of Nitrogen

• Mixture of Sulphur and charcoal is known as 

                 Gun Powder

• Element which meant "I carry light"

                 Phosphorus

• Element which has smell of garlic

                 Phosphorus

• Element which emit green light on exposure to atmosphere

                 White Phosphorus

• Element which is kept under water

                 White Phosphorus

• Element which burns in atmosphere at 30° C

                 White Phosphorus

• Element which is using for making safety matches

                 Red Phosphorus

• Element which is using for making match sticks

                 Pottassium Chlorate

• Phosphorous compound which has the smell of rotten fishes

                 Phosphine

• Element which is known as king of poisons

                 Arsenic

• Most poisonous substance

                 Arsenic

• Study of poisons

                 Toxicology

• Substance which is used as rat poison

                 Zinc Phosphide
                                                                         (To be Continued...)

Chemistry 7

ടിൻ, ലെഡ്, ടൈറ്റാനിയം, ഇരുമ്പ്, പ്രധാനപ്പെട്ട അയിരുകൾ, പ്രധാനപ്പെട്ട ലോഹ സങ്കരങ്ങൾ അവയുടെ ഉപയോഗങ്ങൾ എന്നിവയാണ് ഇന്നത്തെ പാഠത്തിൽ ഉൾപ്പെടുത്തിയിട്ടുള്ളത്

• Element having maximum number of isotops

                   Tin (10)

• Which amalgam is using as a coating agent in reflective mirror

                   Tin amalgam

• Metal which is used in storage batteries

                   Lead

• Element which is using as an anti-knocking agent in petrol

                   Lead

• Most stable substance in nature

                   Lead

• Metal which does not allow the passage of laser through it

                   Lead

• Element which is burst out through the vehicle exhaust pipe

                   Lead

• Elements which are used in safety fuse

                   Tin and Lead

• Alloy of tin an lead which used for making fuse wire is

                   Solder

• Alloys of tin an lead can be separated by

                   Melting

• Metal which shows poorest electrical conductivity

                   Lead

• Metal used to make the parts of aircrafts

                   Titanium

• White paints are made by the oxides of 

                   Titanium

• Whitest compound ever known is

                   Titanium dioxide

• Metal of future or wonder metal

                   Titanium

• When Iron rusts, its weight

                   Increases

• Process of coating Iron with Zinc is called as

                   Galvanization

• Purest form of Iron that contains the least amount of Carbon is 

                   Wrought Iron

• Impure Iron is called 

                   Pig Iron

• An Iron powder compound coated in tape recorder is 

                   Ferromagnetic powder

• An element which is used in making rest resistance alloys

                   Cobalt

• Metals in Stainless steel

                   Iron, Chromium and Nickel

• Rust is chemically

                   Iron oxide

• The overall process by which metals are extracted from ores

                   Metallurgy

• Naturally occuring mineral from which metal can be extracted

                   Ore

• Impurities present in the ore in known as

                   Gangue

• Substances which is used to neutralize and remove Gangue

                   Flux

• Gangue mixed with Flux to form

                   Slag

• Example of Acidic Flux

                   Silica

• Example of Basic Flux

                   Lime Stone

• Minerals abundant on the sea shores of Kerala

                   Ilmenite and monozite

• Thorium is extracted from

                   Monozite

• Titanium is extracted from

                   Ilmenite

• A homogenous mixture of one metal with another metal or non metal is known as

                   Alloys

• Elements in the alloy Type Metal

                   Copper, Tin, Lead and Antimony

• Elements in the alloy Gun Metal

                   Copper, Tin, Zinc

• Elements in Alnico

                   Aluminium, Nickel, Cobalt and Iron

• Elements in Nichrome

                   Nickel, Iron and Chromium

• Elements in Invar

                   Nickel and Iron

• Elements in Duralumin

                   Aluminium, Copper, Manganese, and Magnesium

• Elements in Silumin

                   Silicon and Aluminium

• Elements in Magnalium

                   Magnesium and Aluminium

• Elements in Steel

                   Carbon and Iron

• Elements in Cherome Steel

                   Iron, Chromium

• Elements in German Silver

                   Copper, Nickel and Zinc

• Elements in Sterling Silver

                   Copper, Silver

• Elements in Electrum

                   Gold, Silver

• Elements in Constantan

                   Copper, Nickel

• Elements in Newton Metal

                   Bismuth, Lead, Tin

• Elements in Rose Metal

                   Bismuth, Lead, Tin, Cadmium

• Alloy using for manufacturing Barrel of Gun

                   Gun Metal

• Alloy using for manufacturing heating elements

                   Nichrome

• Alloy using for manufacturing Silver coin

                   Sterling Silver

• Alloy using for manufacturing Pendulum

                   Invar

• Alloy using for manufacturing Springs

                   Chrome Steel

• Ores of Magnesium

                   Dolomite, Magnesite

• Ores of Aluminium

                   Bauxite and Cryolite

• Ores of Lead

                   Galena, Cerussite

• Ore of Calcium

                   Gypsum

• Ores of Iron

                   Haematite, Magnetite, Iron Pyrites

• Ores of Copper

                   Malachite and Chalcolite

• Ore of Uranium

                   Pitch Blende
                                                                                     (To be Continued...)

Chemistry 6

ലോഹങ്ങളിൽ മഗ്നീഷ്യം, മെർക്കുറി, സ്വർണ്ണം, വെള്ളി, ചെമ്പ്, അലൂമിനിയം എന്നിവയുമായി ബന്ധപ്പെട്ട ചോദ്യങ്ങളാണ് ഇന്നത്തെ പാഠത്തിൽ

• The metal present in Chloroplast

                  Magnesium

• The element which is known as Chemical sun

                  Magnesium

• Elements extracted from sea water

                  Magnesium, Sodium, Chlorine, Bromine

• Magnesium compound using for dental filling

                  Magnesia cement (Soral cement)

• First known super conductor

                  Mercury

• Metal with lowest melting point

                  Mercury

• Metal known as quick silver

                  Mercury

• Which is known as anomalous metal

                  Mercury

• Compounds of Mercury is known as (An alloy with one element as mercury

                  Amalgum

• Amalgum using for dental filling

                  Silver Amalgum

• Ore of Mercury

                  Cinnabar

• Unit for mesuring quantity of Mercury

                  Flask (1 Flask=34.5 Kg)

• The tailing of Mercury occurs in reaction with

                  Ozone

• Noble metals are

                  Platinum, Gold and Silver

• Elements which exists in free states in nature

                  Platinum, Gold and Silver

• King of metals

                  Gold

• White Gold

                  Platinum

• Little silver

                  Platinum

• Melting point of Gold

                  1064°C

• Metal which has very high malleability and ductility

                  Gold

• Gold used to make ornaments

                  22 Carat (916 gold)

• Pure Gold

                  24 Carat

• Gold present in 22 carat gold

                  91.6%

• Best conductor of electricity

                  Silver

• Metals which can be separated by Cyanide process

                  Gold and Silver

• Metals present in Panchaloha

                  Gold, Silver, Copper, Iron and Lead

• Metals present large quantity in Panchaloha

                  Copper

• Metal used to make the tip of fountain pen

                  Osmium

• First metal used by man

                  Copper

• Malachite is the mineal of 

                  Copper

• First alloy used by man

                  Bronze

• Metal which is used in gold ornaments

                  Copper

• Liquid in which noble metals are soluble

                  Aqua regia

• Liquid known as Royal water

                  Aqua regia

• Ratio of Hydrochloric acis and Nitric acid in aqua regia

                  3:1

• The scientist who first isolated Aluminium

                  Hans Oersted

• Manufacturing process of Aluminium

                  Hall Heroult process

• Process of Aluminium purification

                  Hoopes Process

• The scientist who first isolated Aluminium from Bauxite 

                  Charles Martin Hall

• Commercially Aluminium is isolated from

                  Bauxite

• Aluminium compound which is used for making precious stones artificially

                  Aluminium Oxide

• Aluminium compound which is used as foaming agent in fire extinguishers

                  Aluminium hydroxide

• Component metals in Bronze

                  Copper and Tin

• Component metals in Brass

                  Copper and Zinc

• Blue colored mineral in Aluminium is

                  Lapis Lazuli

• Double sulphate of Aluminium is known as

                  Alum

• Aluminium compound which is used as mordant (used in dyes of fabrics)

                  Alum

• Aluminium compound which is used for purifying water

                  Alum

• Aluminium compound which is used for manufacturing pewerful magnets

                  Alnico

• Alloy of Aluminium which is used for aircraft manufacturing

                  Duralumin

• Naturally occuring Alumino silicate is 

                  Mica

• Aluminium compound which is known as Emerald 

                  Beryllium Aluminium Silicate

• Aluminium compound which is known as Saphire and Ruby

                  Aluminium Oxide

• Aluminium compound which is known as Topaz

                  Aluminium Fluorine Silicate

• Asbestos is also known as 

                  Rock Cotton

• Metal which is used to make CD

                  Aluminium

• Metal which is showing the properties of both acid and base (Amphoteric)

                  Aluminium

• Clay is a mineral of 

                  Aluminium

• Metal which is used in reflecting telescope

                  Aluminium
                                                                                     (To be Continued...)

Physics 10

ചലന നിയമങ്ങൾ, ബലം എന്നിവയുമായി ബന്ധപ്പെട്ട ചോദ്യങ്ങളാണ് ഇന്നത്തെ പാഠത്തിൽ

• Theory of relativity was introduced by

                  Albert Einstein (1905)

• Which law states that every body continues to be in its state of rest or uniform motion in a straight line unless an external force acts up on

                  Newton's first law of motion

• As per Newton's second law of motion the rate of change of momentum of a body is directly proportional to

                  Applied force

• Which law states that for every action there is an equal and opposite reaction

                  Newton's first law of motion

• Inertia can be explained with

                  Newton's first law of motion

• Which law of motion defining the force

                  Newton's first law of motion

• Which law of motion is known as the measure of force

                  Newton's second law of motion (F=(mv)/t) or F=ma)

• Which law proves that different masses accelerate to the earth at the same rate but with different forces

                  Newton's second law of motion

• The propulsion of rockets and the working of jet engine etc are explained with the help of

                  Newton's third law of motion

• The flying of a bird is consequence of

                  Newton's third law of motion

• CGS unit of force

                  Dyne (1 Newton = 10⁵ Dynes)

• The internal force per unit of cross section of a strained body is called

                  Stress (Force/Area)

• Unit of stress is

                  Pascal or N/m²

• The ratio of change in dimention to the original dimention is called

                  Strain

• Unit of strain is

                  No unit

• Weakest force in nature

                  Gravitational force

• Strongest force in nature

                  Nuclear force

• The upward force exerted by a fluid on a body placed in a fluid is called

                  Buoyant force (Buoyancy)

• The principle of buoyancy was discovered by

                  Archimedes

• When a body inserted into water the feet of weightlessness is because of 

                  Buoyant force

• Weight of the body inserted in water is equal to the weight of liquid displaced by the body. Which law states that

                  Law of Floataton

• The force which enable an object to move along a circular path is

                  Centripetal force

• Centripetal force is always directed towards 

                  Centre of the circle

• Centripetal force required to keep moon in its orbit is given by

                  Gravitational force of Earth

• Raising outer edge of curved road to provide necessary centripetal force is called

                  Banking of the roads

• Tendency of an object following a curved path to fly away from the centre of curvature 

                  Centrifugal force

• Force that acts outwards of a body revolving in a circle

                  Centrifugal force

• Force which helps to seperate the cream from milk is 

                  Centrifugal force

• The capability of rotating object around a fixed axis is called

                  Torque

• The very large force acting for a very short interval of time on a body is called 

                  Impulsive force

• Kicking of a ball, striking a nail with hammer etc are examples of

                  Impulsive force (Impulse=Force x Time)

• Force which opposes the relative motion of two surfaces in contact is called 

                  Frictional force

• Slow landing of parachute is possible because of

                  Frictional force of air

• Ball bearings work on the principle of

                  Rolling friction

• Substances which reduces the friction between moving surfaces is called 

                  Lubricants

• Example of a lubricant which used in heavy machines

                  Graphite

• Force which pulls a body towards earth is called

                  Gravitational force

• Gravitational force is discovered by

                  Sir Issac Newton

• Gravitational force between two bodies is always

                  Attractive

• Force of attraction between earth and any other particle in universe is called

                  Gravity (Force of gravity)

• Gravitational force is maximum in 

                  Jupiter

• Gravitational force is minimum in 

                  Mercury

• Gravitational intensity inside an object is

                  Zero

• If the distance between two objects is doubled, the gravitational force of attraction between them

                  Reduced to quarter (F=GMm/r²) M : mass

• Force of attraction between unlike objects is called 

                  Adhesion

• Force of attraction between like objects is called 

                  Cohesion

• The force exerted by a liquid surface to decrease its surface area to minimum is called 

                  Surface Tension

• Surface tension occurs due to 

                  Cohesion

• Force which helps insects to walk on the surface of water is due to

                  Surface tension

• Detergents are added to water to

                  Reduce surface tension

• Spherical shape of water drop is due to

                  Surface tension

• Surface tension of water is inversily proposal to

                  Temperature and Pressure
                                                                          (To be Continued...)