Solar Cooker

Q.

Which part of the solar cooker is responsible for green house effect in it?

1. Mirror

2. Coating with black colour inside the box

3. Glass sheet

4. Outer cover of the solar cooker

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. Black colour gives more strength to the cooker.

Q.

Why is glass sheet used in solar cooker?

1. to create reflection of sun rays

2. to trap heat and increase the inside temperature

3. to preserve cooking food

4. all of these

Q.

The lid of the solar cooker is made up of ______.

1. plastic sheet

2. black sheet

3. plane mirror

4. glass

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-a, II-b, III-c

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

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

Q.

Pick the incorrect statement about solar cells/panel.

1. gold

2. copper

3. silver

4. nickel

Q.

The efficiency of the solar cooker can be increased by placing a ______.

1. convex mirror

2. plane mirror

3. convex lens

4. concave lens

Q.

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

1. 200 ^oC

2. 140 ^oC

3. 80 ^oC

4. 250 ^oC

Q. Which of the following options correctly labels the given diagram of a solar cooker?

1. A-Concave Mirror; B- Glass lid; C- Insulating surface; D- Plane Mirror
2. A- Plane Mirror; B- Glass lid; C- Insulating surface; D- Black painted surface
3. A- Insulator; B- Plane Mirror; C- Glass lid; D- Insulating surface
4. A- Insulating surface; B- Concave mirror; C- Plane mirror; D- Black painted surface

Q.

How high temperature is achieved in solar cooker by the use of mirrors?

1. mirrors are used to reflect sunlight on the the cooker thus more heat.

2. mirrors absorb more sunlight falling on the cooker thus more heat.

3. mirrors diffuse light in all direction.

4. none of these.