Q15 of 216 Page 486

What are the advantages and disadvantages of using a solar cooker? Are there places where solar cookers would have limited utility?

ADVANTAGES OF USING SOLAR COOKER:


1. No harm to Environment: The solar cooker use solar energy to complete its work. There are no chemicals or smoke released that is harmful to the environment. In short, it is pollution free.


2. Safe to use: The solar cooker is the safest appliance to be used. There is no fear of gas leakage, fire, burning of wood, burning of food etc.


3. No electricity: The solar cooker is totally dependent on solar energy. There is no requirement of electricity for the solar cooker to work.


DISADVANTAGES OF USING SOLAR COOKER:


1. Climatic conditions: Solar cooker uses solar energy to work efficiently. In the absence of sunlight during winter and rainy season, the cooker cannot function.


2. Time-consuming: The time required to cook in a solar cooker is greater than the time required to cook on the gas stove. Hence, solar cookers are time consuming.


Solar cookers are direct dependent on sunlight (solar energy) to work. Hence, a solar cooker cannot be used in places where no or limited sunlight is available.


The places with no sunlight would have limited solar cooker utility.


More from this chapter

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13

Explain the meaning of the word ‘ electromagnetic’ and ‘induction’ in the term electromagnetic induction. On what factors does the value of induced current produced in a circuit depend state on practical application of this phenomenon in everyday life.

 14

Explain the meaning of the word ‘ electromagnetic’ and ‘induction’ in the term electromagnetic induction. On what factors does the value of induced current produced in a circuit depend state on practical application of this phenomenon in everyday life.

 16

A dry pallet common base ‘X’, when kept in open air absorbs moisture and turns sticky. The compound is also a by-product of chlor-alkali process. Identify ‘X’. What type of reaction occurs when ‘X’ is treated with strong acid? Write a balanced chemical equation for such a reaction.

ii. Can we store the ‘X’ in an aluminium container? Give reason in support of your answer.


OR


Give a suitable reason for the following statements:


i. Rain water conducts electricity but distilled water does not.


ii. We feel burning sensation in the stomach when we overeat.


iii. A tarnished copper vessel regains its shine when rubbed with lemon.


iv. The crystals of washing soda change to white powder on exposure to air.


v. An aqueous solution of sodium chloride is neutral but an aqueous solution of sodium carbonate is basic.

 17

In the following table, six elements A,B,C,D,E and F of the modern periodic table with atomic numbers 3 to 18 are given:


i. Which of these is (a) Noble gas, (b) halogen?


ii. Which of these is the most active metal in 3rd period?


iii. Identify the most electronegative element in the third period.


iv. In the compound between B and F, what type of bond will be formed?


v. What would be the nature of oxide formed by C?