Lakhmir Singh & Manjit Kaur - Physics

Book: Lakhmir Singh & Manjit Kaur - Physics

Chapter: 3. Sources of Energy

Subject: Physics - Class 10th

Q. No. 18 of Short Answer Type Questions-Pg-140

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18

Explain why, a plane mirror reflector is used in a box-type solar cooker.

Usually, a plane mirror reflector is attached on the top of the box. This is because the plane mirror reflector increases the efficiency of solar cooker by reflecting more and more sunlight inside the box.


Chapter Exercises

Very Short Answer Type Questions-Pg-121
Very Short Answer Type Questions-Pg-130
Very Short Answer Type Questions-Pg-140
Very Short Answer Type Questions-Pg-148
Very Short Answer Type Questions-Pg-156
Very Short Answer Type Questions-Pg-161
Short Answer Type Questions-Pg-122
Short Answer Type Questions-Pg-131
Short Answer Type Questions-Pg-140
Short Answer Type Questions-Pg-148
Short Answer Type Questions-Pg-157
Short Answer Type Questions-Pg-161
Questions Based on High Order Thinking Skills (HOTS)-Pg-123
Questions Based on High Order Thinking Skills (HOTS)-Pg-132
Questions Based on High Order Thinking Skills (HOTS)-Pg-142
Questions Based on High Order Thinking Skills (HOTS)-Pg-150
Questions Based on High Order Thinking Skills (HOTS)-Pg-159
Long Answer Type Questions-Pg-122
Long Answer Type Questions-Pg-131
Long Answer Type Questions-Pg-141
Long Answer Type Questions-Pg-149
Long Answer Type Questions-Pg-157
Multiple Choice Questions (MCQs)-Pg-122
Multiple Choice Questions (MCQs)-Pg-131
Multiple Choice Questions (MCQs)-Pg-141
Multiple Choice Questions (MCQs)-Pg-149
Multiple Choice Questions (MCQs)-Pg-158
Multiple Choice Questions (MCQs)-Pg-161

More Exercise Questions

15

What is the difference between a thermal power plant and hydro power plant?
15

Which of the two causes serious air pollution and how?
16

Compare the sun and the fossil fuels as the sources of energy.
17

What kind of mirror, concave, convex or plane, would be best suitable for use in a solar cooker? why?
18

Name that part of a box-type solar cooker which allows the sun’s rays to enter the box but does not allow inside heat to go out.
18

Explain why, a plane mirror reflector is used in a box-type solar cooker.
19

What are the advantages and disadvantage of using a solar cooker?
20

What is a solar cell? Draw the labeled diagram of a solar cell.
20

Name the semi-conductor material which is usually used for making solar cells.
20

Write the uses of solar cells.
21

State the advantage and disadvantage of using solar cells.
22

What is a solar cell panel? For what purpose is it used? State its two main advantages.
23

What is solar constant? What is the value of solar constant?
23

If the energy received by 5 m2 area in 10 minutes is 4200 kJ, calculate the value of solar constant.
24

How has the traditional use of energy of flowing water been modified for our convenience?
25

How has the traditional use of wind energy been modified for our convenience?

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