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Thermal Properties of Matter
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Thermal Properties of Matter
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1. 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]
2. The temperature of inversion of a thermocouple is620° C and the neutral temperature is 300° CWhat isthe temperature of cold junction? [2005]
3. Mercury thermometer can be used to measuretemperature upto [1992]
4. 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]
5. Liquid oxygen at 50 K is heated to 300 K atconstant pressure of 1 atmThe rate of heating isconstantWhich one of the following graphs representsthe variation of temperature with time? [2012]
6. If the temperature of the sun is doubled - the rate ofenergy received on earth will be increased by a factor of[1993]
7. If the temperature of the sun is doubled - the rate ofenergy received on earth will be increased by a factor of[1993]
8. 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]
9. 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]
10. The density of water at 20°C is 998 kg/m 3 and at40°C 992 kg/m3The coefficient of volume expansion ofwater is [NEETKar2013]
11. 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]
12. Mercury thermometer can be used to measuretemperature upto [1992]
13. Liquid oxygen at 50 K is heated to 300 K atconstant pressure of 1 atmThe rate of heating isconstantWhich one of the following graphs representsthe variation of temperature with time? [2012]
14. The presence of gravitational field is required forthe heat transfer by [2000
15. 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]
16. 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]
17. 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]
18. 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]
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. Consider a compound slab consisting of twodifferent materials having equal thicknesses andthermal conductivities K and 2K - respectivelyTheequivalent thermal conductivity of the slab is [2003]
21. A black body is at temperature of 500 KIt emitsenergy at rate which is proportional to [1997]
22. 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]
23. 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]
24. 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]
25. 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]

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