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Thermal Properties of Matter
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Thermal Properties of Matter
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1. On a new scale of temperature (which is linear)and called the W scale - the freezing and boiling points ofwater are 39° W and 239° W respectivelyWhat will bethe temperature on the new scale - corresponding to atemperature of 39° C on the Celsius scale? [2008]
2. A black body at 1227°Cemits radiations withmaximum intensity at a wavelength of 5000ÅIf thetemperature of the body is increased by 1000°C - themaximum intensity will be observed at [2006]
3. A black body is at 727° CIt emits energy at a ratewhich is proportional to [2007]
4. N molecules each of mass m of a gas A and 2Nmolecules each of mass 2m of gas Bare contained in thesame vessel which is maintained at temperature TThemean square velocity of molecules of B type is v 2 and themean square rectangular component of the velocity of Atype is denoted by ω 2Then ω 2 /v2 [1991]
5. If the cold junction of a thermo-couple is keptat0°Cand the hot junction is kept at T°C then the relationbetween neutral temperature (Tn) and temperature ofinversion (Ti ) is [2007]
6. Consider a compound slab consisting of twodifferent materials having equal thicknesses andthermal conductivities K and 2K - respectivelyTheequivalent thermal conductivity of the slab is [2003]
7. An electric kettle takes 4A current at 220 VHowmuch time will it take to boil 1 kg of water fromtemperature 20° C? The temperature of boiling water is100° C[2008]
8. Mercury thermometer can be used to measuretemperature upto [1992]
9. N molecules each of mass m of a gas A and 2Nmolecules each of mass 2m of gas Bare contained in thesame vessel which is maintained at temperature TThemean square velocity of molecules of B type is v 2 and themean square rectangular component of the velocity of Atype is denoted by ω 2Then ω 2 /v2 [1991]
10. Assuming the sun to have a spherical outer surfaceof radius r - radiating like a black body at temperature t°C - the power received by a unit surface - (normal to theincident rays) at a distance R from the centre of the sunis [2007]
11. A black body at 227°C radiates heat at the rate of 7cals/cm 2 sAt a temperature of 727°C - the rate of heatradiated in the same units will be: [2009]
12. The radiant energy from the sun - incident normallyat the surface of earth is 20 k cal/m 2 minWhat wouldhave been the radiant energy - incident normally on theearth - if the sun had a temperature - twice of the presentone? [1998]
13. If λm denotes the wavelength at which the radiativeemission from a black body at a temperature T K ismaximum - then [2004]
14. The radiant energy from the sun - incident normallyat the surface of earth is 20 k cal/m 2 minWhat wouldhave been the radiant energy - incident normally on theearth - if the sun had a temperature - twice of the presentone? [1998]
15. The presence of gravitational field is required forthe heat transfer by [2000
16. If the cold junction of a thermo-couple is keptat0°Cand the hot junction is kept at T°C then the relationbetween neutral temperature (Tn) and temperature ofinversion (Ti ) is [2007]
17. A black body at 227°C radiates heat at the rate of 7cals/cm 2 sAt a temperature of 727°C - the rate of heatradiated in the same units will be: [2009]
18. Two rods of thermal conductivities K 1 and K2 - cross-sections A 1 and A2 and specific heats S1 and S2 areof equal lengthsThe temperatures of two ends of eachrod are T1 and T2The rate of flow of heat at the steadystate will be equal if [2002]
19. Which of the following circular rods (given radius rand length l) - each made of the same material and whoseends are maintained at the same temperature willconduct most heat? [2005]
20. If the temperature of the sun is doubled - the rate ofenergy received on earth will be increased by a factor of[1993]
21. Mercury thermometer can be used to measuretemperature upto [1992]
22. A black body is at 727° CIt emits energy at a ratewhich is proportional to [2007]
23. Two metal rods 1 and 2 of same lengths have sametemperature difference between their endsTheirthermal conductivities are K1 and K2 and cross sectionalareas A1 and A2 - respectivelyIf the rate of heatconduction in rod 1 is four times that in rod 2 - then[NEETKar2013]
24. 10 gm of ice cubes at 0°Care released in a tumbler(water equivalent 55 g) at 40°CAssuming thatnegligible heat is taken from the surroundings - thetemperature of water in the tumbler becomes nearly (L=80 cal/g) [1988]
25. A black body is at temperature of 500 KIt emitsenergy at rate which is proportional to [1997]

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