Integrated Science

Question 1

1Solar cells are usually made from the semiconductor

Easy

A. plastic B. iron C. copper D. silicon

Question 2

2A solar panel gives the most power when it

Easy

A. is covered in dust B. is placed indoors C. faces the sun directly with no shade D. is kept wet

Question 3

3A charge controller in a solar system mainly

Easy

A. cleans the panels B. cools the house C. measures sunlight D. prevents the battery from overcharging

Question 4

4The device that converts sunlight directly into electricity is a

Easy

A. battery B. generator C. photovoltaic (solar) cell D. transformer

Question 5

5Solar panels produce direct current (DC). To run normal household appliances you need

Easy

A. a fuse only B. a transformer only C. an inverter D. a dynamo

Question 6

6Batteries in a solar home system are used to

Easy

A. change AC to DC only B. store energy for use at night C. increase sunlight D. cool the panels

Question 7

7A solar panel of area 2 m² receives 800 W/m² and is 15% efficient. Its electrical output is

Hard

A. 120 W B. 800 W C. 1,600 W D. 240 W

Question 8

8A solar water heater uses a black collector because black

Easy

A. cools water B. absorbs heat well C. reflects heat D. is cheaper

Question 9

9Solar cells connected in series

Hard

A. increase the output voltage B. store energy C. reduce voltage D. increase the current only

Question 10

10A solar panel changes

Easy

A. chemical energy into heat B. heat energy into sound C. light energy into electrical energy D. electrical energy into light