A man bought a device X which could cook pulses, vegetables and rice without using any fuel like wood, coal, kerosene or LPG, etc. This device did not work at night. It also took a lot of time for cooking.
(a) Name the device X.
(b) What is the source of energy which cooks food in this device?
(c) What is the name of the process which traps energy in this device?
(d) State one advantage (other than saving on fuel) of using such a device for cooking food.
(a) The device which cooks food without fuel is solar cooker. IT doesn’t work at night because it requires sunlight to operate.
(b) The source of energy for solar cookers is sun.
(c) The process of trapping sun’s energy in the solar cookers is called as greenhouse effect.
(d) Using devices like solar cooker is beneficial because they do not cause pollution.