question_answer1) Is temperature a macroscopic or microscopic concept?
question_answer2) What is dynamical theory of heat?
question_answer4) Why a clinical thermometer should not be sterilized by boiling?
question_answer5) Why should a thermometer bulb have a small heat capacity?
question_answer6) What do you mean by triple point of water? Why it is unique?
question_answer7) Why are gas thermometers are more sensitive than mercury thermometers?
question_answer8) Can the temperature of a body be negative on the kelvin scale?
question_answer15) A body at higher temperature contains more heat, comment.
question_answer17) Do all solids expand on heating? If not, give an example.
question_answer18) Why does a solid expand on heating?
question_answer19) Is the temperature coefficient always positive?
question_answer22) Why a small gap is left between the iron rails of railway tracks?
question_answer24) Pendulum clocks generally run fast in winter and slow in summer. Why?
question_answer25) Why is invar used in making a clock pendulum?
question_answer26) Why must telephone or power lines necessarily slag a little?
question_answer32) Why iron rims are heated red hot before being put on the cart wheels?
question_answer33) In riveting boiler plates, red hot rivets are used. Why?
question_answer38) Is \[J\] a physical quantity?
question_answer39) Why is \[J\] called a conversion factor?
question_answer44) Can a given amount of mechanical energy be completely converted into heat?
question_answer45) A match stick can be lighted by rubbing it against a rough surface. Why?
question_answer48) What is the difference between the specific heat and the molar specific heat?
question_answer49) Why water is preferred to any other liquid in the hot water bottles?
question_answer50) The coolant used in a nuclear reactor should have high specific heat. Why?
question_answer51) Why juice bottles are placed under water in the cold countries?
question_answer52) Why is water used as an effective coolant?
question_answer54) Why do the metal utensils have wooden handles?
question_answer55) Why birds are often seen to swell their feathers in winter?
question_answer56) Why an ice box is constructed with a double wall?
question_answer58) A squirred wraps its bushy tail round its body during its winter sleep. Why?
question_answer59) Calorimeters are made of metals not glass. Why?
question_answer60) When we step barefoot into an office with a marble floor, we feel cold. Why?
question_answer61) Why we can easily boil water in a paper cup?
question_answer64) Woolen clothes are worn in winter. Why?
question_answer65) Why do we use copper gauze in Davy's safety lamp?
question_answer67) Stainless steel cooking pans are preferred with extra copper bottom. Why?
question_answer71) Why do electrons in insulators not contribute towards its thermal conductivity?
question_answer72) Why felt rather than air is employed for thermal insulation?
question_answer73) If air is poor conductor of heat, why do we not feel warm without clothes?
question_answer74) Why small holes are provided at the bottom of the chimney of the lamp?
question_answer75) Why rooms are provided with the ventilators near the roof?
question_answer76) Why it is much hotter above a fire than by its side?
question_answer77) Why snow is a better heat insulator than ice?
question_answer78) Can we boil water inside an earth satellite?
question_answer79) Water is heated from below. Why?
question_answer81) Why are the cooling coils fitted near the ceiling of a refrigerator?
question_answer84) Why do animals curl into a ball, when they feel very cold?
question_answer86) Why a body with large reflectivity is a poor emitter?
question_answer87) Why does a piece of red glass when heated and taken out glow with green light?
question_answer91) Why are clear nights colder than cloudy nights?
question_answer94) Gasoline tanks are generally painted with aluminium paint. Why?
question_answer95) A hole in the cavity of a radiator is a black body. Why?
question_answer96) Why is there the word displacement in Wien's displacement law?
question_answer97) Black body radiation is white. Comment.
question_answer99) In what respect is the thermal radiation different from light?
question_answer100) What is critical temperature?
question_answer101) Can a gas be liquified at any temperature by the increase of pressure alone?
question_answer102) What is the effect of pressure on melting point of a solid?
question_answer103) How does the boiling point of water change with pressure?
question_answer105) What is the significance of negative slope of ice line of water?
question_answer111) Explain why a new quilt is warmer than an old one.
question_answer112) Give reasons why water is considered unsuitable for use in thermometers.
question_answer113) Give four reasons why is mercury used in thermometers.
question_answer114) Give reasons why is a platinum wire used in a resistance thermometer.
question_answer115) Give some merits of gas thermometers over those of mercury thermometers.
question_answer130) How does tea in a thermos flask remain hot for a long time?
question_answer131) Distinguish between conduction, convection and radiation.
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worth of food everyday. His food contains 
of butter plus a plate of sweets everyday, besides items which provide him with other nutrients (proteins, vitamins, minerals, etc.) in addition to fats and carbohydrates. The caloric value of 10 g of butter is 
and that of a plate of sweets is of average 
.What dietary strategy should he adopt to cut down his calories to about 
per day? Assume the man cannot resist eating the full plate of sweets once it is offered to him! 