A blackbody does not: 
a. emit radiation.
b. absorb radiation.
c. reflect radiation.
d. refract radiation.
Choose the correct option:
1. (a), (b) 
2. (b), (c) 
3. (c), (d) 
4. (a), (d) 

A piece of charcoal and a piece of shining steel of the same surface area are kept for a long time on an open lawn in the bright sun.
a. The steel will absorb more heat than the charcoal.
b. The temperature of the steel will be higher than that of the charcoal.
c. If both are picked up by bare hands, the steel will be felt hotter than the charcoal.
d. If the two are picked up from the lawn and kept in a cold chamber, the charcoal will lose heat at a faster rate than the steel.
Choose the correct option:
1.  (a), (b) 
2.  (c), (d) 
3.  (d) only 
4.  (a), (d)