Shalini makes a model of box type solar cooker. She uses a black translucent plastic sheet

sourcesofenergy

#1

Shalini makes a model of box type solar cooker. She uses a black translucent plastic sheet as lid over thebox. The output of the cooker is found to be too low. Her teacher observes this activity of herand asks her for some modifications to enhance its efficiency.Shalini enquires about the reason for such modification and does the needful.
Read the given passage and answer the following questions.
(i) Why does the solar cooker not function well?
(ii) What modification does the teacher ask to make and why?
(iii) Discuss the values of Shalini and her teacher.


#2

(i) The translucent plastic sheet could not trap enough heat in the box of the solar cooker.
(ii) The teacher asked Shalini to use a glass lid because glass traps heat due to greenhouse effect.
(iii) Shalini is experimental, practical, inquisitive and obedient. Her teacher is dedicated, having patience and helpful.