Physics 11

മർദ്ദം, സാന്ദ്രത, കേശികത്വം, ഇലാസ്റ്റിസിറ്റി, ലഘുയന്ത്രങ്ങൾ, കാന്തികത്വം എന്നിവയുമായി ബന്ധപ്പെട്ട ചോദ്യങ്ങളാണ് ഇന്നത്തെ പാഠത്തിൽ

• Force acting on a unit area is called

                   Pressure (Force/Area)

• Total force acting on a body perpendiculat to its surface area is called

                   Thrust

• SI unit of pressure

                   Pascal (N/m²)

• CGS unit of pressure

                   Barye

• SI unit of Thrust

                   Newton

• Normal atmospheric pressure

                   760 mm of Mercury

• Another unit of atmospheric pressure is

                   Bar (1 Bar=105 Pascal)

• Force excerted by the gaseous molecule on a unit surface area of Earth is called

                   Atmospheric pressure

• Instrument used to measure atmospheric pressure

                   Barometer

• Rising of Barometer indicates

                   Calm Climate

• Sudden fall in Barometer indicates

                   Storm

• As the height increases from sea level, the atmospheric pressure

                   Decreases

• Liquid pressure increases as depth

                   Increases

• Internal frictional force acting between parallel layers of a liquid is called

                   Viscous Force

• Property of liquids to show Viscous force is called

                   Viscosity

• CGS unit of viscosity

                   Poise

• Matter that does not have viscosity

                   Solid

• Liquids having low viscosity and which flow easily are called

                   Mobile liquids (Eg: Water, Kerosene)

• Liquids having zero viscosity are called

                   Superfluids

• Liquids having high viscosity are called

                   Viscous liquids (Eg: Honey, Glycerine)

• As temperature increases viscosity of a liquid

                   Decreases

• Phenomenon of rising or falling of the liquid level against the gravitational force is called

                   Capillarity

• Chalk, blotting paper, Bricks etc are absorbing liquids quickly due to

                   Capillarity

• Process involved in capillary action are

                   Surface Tension

• Ability of a body to regain its original shape and size on removal of deforming force is called

                   Elasticity

• Minimum velocity required for a body to escape from Earth's gravitational force is called

                   Escape Velocity

• Escape velocity of planets increases with its

                   Mass

• Escape velocity of Earth

                   11.2 km\Sec

• Escape velocity of Moon

                   2.4 km\Sec

• Weight of freely falling body

                   Zero

• Law of freely falling object is introduced by

                   Galilio

• Total gravitational force acted upon a body is known as

                   Weight (W=mg ; g-acceleration due to gravity)

• Weight of a body is

                   Zero at centre of earth, Minimum at equator, maximum at poles

• Weight of a body in Moon is

                   1/6th of weight in Earth (Mass remain same)

• Amount of mtter contained in a given body

                   Mass

• Ratio of mass of a body to its volume is

                   Density (Mass/Volume)

• Unit of Density

                   Kg/m³

• Density of water is

                   1000 Kg/m³

• Density of water is maximum at

                   4°C

• Liquid which has highest Density

                   Mercury

• Water occupies maximum volume at

                   0°C

• Ratio of density of a body to the density of water is known as

                   Relative density or Specific gravity

• Pressure of liquid varies with its

                   Density

• Ice floating on water because

                   Its density less than water (1/10th of its volume can be seen)

• When ice melts on water surface, level of water

                   Remain unchanged (Volume decrease when ice melts)

• Simplest mechanisms that provide mechanical advantage 

                   Simple machines

• The law of lever was proposed by

                   Archimedes

• Lever in which Fulcrum comes between Effort and resistance is called as

                   1st Order lever

• Examples of first order lever

                   Scissors, Common balance, Nail puller, See-saw

• Lever in which resistance comes between Effort and Fulcrum is called as

                   2nd Order lever

• Examples of Second order lever

                   Bottle opener, Wheel barrow, nut cracker, Lemon sqeezer

• Lever in which Effort comes between resistance and Fulcrum is called as

                   3rd Order lever

• Examples of Third order lever

                   Forceps, Ice tongs, Fire tongs, Pincers

• Examples of Magnetic substances are

                   Iron, Nickel, Cobalt

• The term magnet is derived from

                   FMagnesia- a place near Asia Minor

• Naturally occuring magnet\ Magnetism first observed in

                   Lode stones

• Magnetic strength is more powerful at

                   Poles

• Scientist who proposed magnetic behavior of Earth

                   William Gibber

• A coil of insulated wire wound on a rod shaped solid iron is called

                   Solenoid

• Magnetic force of attraction at center of a magnet is

                   Zero

• Example of a paramagnetic substance

                   Oxygen

• Substances showing magnetism in presence of electricity are called as 

                   Electromagnets (temporary magnets)

• An object made from magnetized material and create its own magnetic field is known as 

                   Permanent magnet

• Powerful permanent magnets are made from

                   ALNICO

• Direction of magnetic lines inside a magnet is 

                   From South to North

• Diagnosis and treatment methode which uses powerful magnets

                   Magnetic Resonance Imaging (MRI)

• While heating or hammering, the magnetism of an object

                   Decreases

• Mechanism by which objects are attracted to magnets

                   Ferro magnetism

• Strongest type of magnetism

                   Ferro magnetism

• Temperature dependent magnetisms are called as

                   Paramagnetism
                                                                                                     (To be Continued...)