Solar Cooker

Q.

Which part of the solar cooker is responsible for greenhouse-like effect?

1. glass plate

2. Outer cover of the solar cooker

3. mirror

4. Coating with black colour inside the box

Q.

The maximum temperature that can be attained in a box-type solar cooker is ______.

1. 200 ^oC

2. 80 ^oC

3. 140 ^oC

4. 250 ^oC

Q. Match the following:
$\begin{array}{cc}I.Coatingsolarcookerwithblackpaint& a.Causesgreenhouseeffectinsidethecooker\\ II.Concavemirror& b.Absorbsmoreheat\\ III.Glasssheetcovering& c.Convergeheatatonepoint\end{array}$

1. I-c, II-b, III-a
2. I-b, II-a, III-c
3. I-a, II-b, III-c
4. I-b, II-c, III-a

Q.

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

1. I-b, II-c, III-a

2. I-c, II-b, III-a

3. I-b, II-a, III-c

4. I-a, II-b, III-c

Q.

Why is the solar cooker painted black from inside?

1. none of these

2. black colour absorbs more heat than other coloured objects

3. black colour reflects more heat than other coloured objects

4. black colour emits heat of its own

Q.

In a solar panel, the metal used is ______.

1. gold

2. copper

3. silver

4. nickel

Q.

Which radiations of sunlight are used in heating a solar cooker?

1. ultra violet radiation

2. infra-red radiation

3. visible light

4. all of the above

Q.

Name one of the eco-friendly technologies.

Q.

Why is the solar cooker painted black from inside?

1. Black colour absorbs more heat than other coloured objects.

2. Black colour reflects more heat than other coloured objects.

3. Black colour emits heat of its own.

4. None of these.

Q. Advantages of using solar cell includes:

1. Low maintenance
2. High maintenance
3. No air pollution
4. (a) and (c) above.