Conceptual question for Thermodynamics Part 4

PART 4

1. The amount of energy radiated by a body depends on
a.The nature of the surface
b. The area of the surface
c. Temperature of the surface
d. all the above

2. The wavelenght of the radiation emitted by the body depends on
a.The nature of the surface
b. The area of the surface
c. Temperature of the surface
d. all the above

3.A solid sphere and a hollow sphere of same material and size are heated to the same temperature and allowed to cool in the same surounding.If the temperature diffrence between the sphere and surrounding is T.then
a. Both sphere will cool at the same rate for all values of T
b Hollow sphere will cool faster for all values of T
c. Solid sphere will cool faster for all values of T
d. Both sphere will cool at the same rate for small values of T

4. An ideal black body is thrown in the furnace.It is observed that
a. Intially it is the darkest body and at later times the brightest
b. it is the darkest body all the times
c. It cannot be distinguish at all the times
d. Intially it is the darkest body and at later times It cannot be distinguish


5.In which of the following process,convection does not takes place
a. sea and land breeze
b.boiling of the water
c.heating air around the furnace
d.warming of glass of bulb due to filament

6.One end of a metal rod is kept in a furnace.In steady state,the temperature of the rod
a. Increase
b decrease
c. remains constant
d is non uniform

7 what is true for black body
a e=a=1
b emit radiation and absorb radiation
c. refract radiation
d none of the above

8.which one is true about thermal radiation
a. all bodies emit radiation at all temperature
b. Good reflectors are good emitters of thermal radiation
c. Thermal radiation travel in free space with the velocit of light
d. Thermal radiation are not reflected from the mirror