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Thermal Properties of Matter
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Thermal Properties of Matter
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25 Questions

1. If λm denotes the wavelength at which the radiativeemission from a black body at a temperature T K ismaximum - then [2004]
2. Mercury thermometer can be used to measuretemperature upto [1992]
3. 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]
4. 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]
5. Mercury thermometer can be used to measuretemperature upto [1992]
6. A black body has maximum wavelength λm attemperature 2000 KIts corresponding wavelength attemperature 3000 K will be [2001]
7. 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]
8. 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]
9. The temperature of inversion of a thermocouple is620° C and the neutral temperature is 300° CWhat isthe temperature of cold junction? [2005]
10. 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]
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. 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]
13. 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]
14. 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]
15. 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]
16. 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]
17. A beaker full of hot water is kept in a roomIf it coolsfrom 80°Cto 75°C in t 1 minutes - from 75° C to 70°C in t 2minutes and from 70°C to 65°C in t 3 minutes - then[1995]
18. A beaker full of hot water is kept in a roomIf it coolsfrom 80°Cto 75°C in t 1 minutes - from 75° C to 70°C in t 2minutes and from 70°C to 65°C in t 3 minutes - then[1995]
19. 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]
20. 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]
21. 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]
22. 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]
23. 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]
24. A black body is at temperature of 500 KIt emitsenergy at rate which is proportional to [1997]
25. Consider a compound slab consisting of twodifferent materials having equal thicknesses andthermal conductivities K and 2K - respectivelyTheequivalent thermal conductivity of the slab is [2003]

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