Question

'Gulab Jamuns' (assumed to be spherical) are to be heated in an oven. They are available in two sizes , once twice bigger (in radius) then the other . Pizzas (assumed to be discs) are also to be heated in oven. They are also in two sizes, one twice big(in radius)than the other. All four are put together to be heated to oven temperature. Choose the correct option from the following:

• A. Both size gulab jamuns will get heated in the same time.
• B. Smaller gulab jamuns are heated before bigger ones.
• C. Smaller pizzas are heated before bigger ones
• D. Bigger pizzas are heated before smaller ones.

Answer 1

Answer: (B), (C)

The correct options are
B Smaller gulab jamuns are heated before bigger ones.
C Smaller pizzas are heated before bigger ones

The object having less surface area will be heated first because of less heat radiation .

So, smaller gulab jamuns are having least surface area, hence they will be heated first. Similarly, smaller pizzas are heated before bigger ones because they are of small surface areas.