Match the following:

$\begin{matrix} I.Coating solar cooker with black paint & a. Causes greenhouse effect inside the cooker II.Concave mirror & b. Absorbs more heat III.Glass sheet covering & c.Converge heat at one point \end{matrix}$

I-a, II-b, III-c

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I-b, II-c, III-a

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I-c, II-b, III-a

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I-b, II-a, III-c

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Solution

The correct option is B
I-b, II-c, III-a

Solar cookers use the heat from the sun for cooking food. The functions of different components of the solar cooker are as follows:
1. Glass lid - covers the top and creates greenhouse effect inside the cooker.
2. Black painted surface - the surface of the solar cooker is painted black as black absorbs maximum solar energy. This increases the temperature inside the solar cooker.
3. Plane Mirror - plane mirror as a reflector and reflects more rays inside the cooker.
4. Concave mirror - concave mirrors are provided in the solar cookers for concentrating solar rays at one point. This increase the maximum temperature reached inside the solar cooker.
5. Insulator - an insulator is used to cover the solar cooker from outside so that the heat is not lost to the surroundings.

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Q. Question 9
Which part of the solar cooker is responsible for greenhouse effect?

(a) Coating with black colour inside the box
(b) Mirror
(c) Glass sheet
(d) Outer cover of the solar cooker

Q. The part of box-type solar cooker which is responsible for producing greenhouse effect is :
(a) plane mirror reflector (b) black coating inside the box
(c) glass sheet cover (d) utensils placed in the cooker box

Q. Two students made box-type solar cookers separately. They both painted the insulated box with black colour from inside, the cooking pots were painted black from outside, and a plane mirror reflector was also attached. One of the students covered the solar cooker box with a transparent glass sheet but the other student covered the solar cooker box with a transparent plastic sheet. Which of the two solar cookers will be more efficient and why?

(a) With the help of a labelled diagram, explain the construction and working of a solar cooker.
(b) Why is the solar cooker box painted black from inside ?
(c) Why is the solar cooker box covered with a glass sheet ?

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Match the following: I.Coating solar cooker with black painta. Causes greenhouse effect inside the cookerII.Concave mirrorb. Absorbs more heatIII.Glass sheet covering c.Converge heat at one point

Match the following:

$\begin{matrix} I.Coating solar cooker with black paint & a. Causes greenhouse effect inside the cooker II.Concave mirror & b. Absorbs more heat III.Glass sheet covering & c.Converge heat at one point \end{matrix}$