Physics 8

തെർമോ മീറ്ററുകൾ, താപ പ്രസരണം തുടങ്ങിയ ഭാഗങ്ങളിൽ നിന്നുള്ള ചോദ്യങ്ങളാണ് ഇന്നത്തെ പാഠത്തിൽ

• Thermometer was invented by

                 Galelio

• Mercury thermometer was invented by

                 Fahrenheit

• Clinical Thermometer was invented by

                 Thomas Albutt

• Range of Clinical Thermometer is

                 -35°C to 42°C

• Normal human body temperature is

                 36.9°C (98.4°F or 310K)

• Thermometer used to measure temperature very near to absolute zero

                 Magnetic Temperature

• Magnetic Thermometer works on the basis of

                 Curies Law

• Thermometer in which temperature is calculated from the resistance of a coil

                 Resistance Thermometer

• Thermometer used to measure high temperature

                 Pyrometer

• Thermometer used to measure very low temperature

                 Cryometer

• What are the methods of heat transmission

                 Conduction, Convection, Radiation

• Process of exchange of hotter particles to the neighbouting colder particles is known as

                 Conduction

• Heat transmission mode in which energy transmitted by direct contact

                 Conduction

• Transfer of heat in a fluid with the help of heated particles from hotter region to a colder region is called 

                 Convection

• Sea and land breezes can be explained on the basis of

                 Convection

• Ocean currents, Monsoons and Trade winds are based on 

                 Convection

• Transfer of heat from one point to another without heating the medium is called

                 Radiation

• Solar energy reaches Earth through

                 Radiation

• The main source of our energy

                 Sun

• Transfer of heat from one point to another without heating the medium is called

                 Radiation

• Heat loss through conduction and cenvection in Thermos flasks prevents by

                 Vacuum

• Heat loss trough Radiation in Thermos flasks prevents by

                 Polished shining surface

• Glass used to make Thermos flasks

                 Borosilicate glass

• The temperature at which water has least volume and high density

                 4°C

• The property of decreasing volume of a liquid by increasing the temperature from 0 to 4 degree and increasing volume after that

                 Anomalous expansion

• On freezing the volume of water

                 Increasing

• Tendency of matter to change in volume in response to change in temperature is called

                 Thermal Expansion

• Mercury thermometer works on the principle of

                 Thermal Expansion

• The substance which expand more on heating

                 Gases

• The substance which expand less on heating

                 Solids

• Property of a material to conduct heat is called 

                 Thermal conductivity

• Unit of thermal conductivity

                 Watts per meter kelvin

• The law of heat conduction is called 

                 Fourier's law

• Coefficient of thermal conductivity

                 K Factor or Thermal admittance

• In refrigerator cooling is produced by

                 Evaporation

• Amount of water vapour present in air is called 

                 Humidity

• Perspiration is maximum when

                 Temperature is maximum and air is humid

• Phenomenon of reducing the melting point of ice on exerted pressure is called 

                 Regelation

• Skating on ice is possible due to the phenomenon of

                 Regelation

• Joule's law is related to

                 Heat

• Example of  a good conductor of heat and bad conductor of electricity

                 Mica

• Density of a body decreases with 

                 Rise in temperature

• Fixed temperature at which solid becomes a liquid is known as 

                 Melting point

• Melting point of ice raised by the decrease of 

                 Pressure

• Fixed temperature at which a liquid boils and changes itself into vapour is called

                 Boiling point

• Melting point of water raised by the increase of 

                 Pressure

• Melting point of Mercury

                 -39°C

• Melting point of Alcohol

                 114°C

• Water inside Pressure Cooker boils at

                 120°C
                                                                        (To be Continued...)