Exam Paper Questions

Question 0

A solar array in Germany produces electricity equivalent to the power output of 20 nuclear reactors

1. By what method of energy transfer does the suns energy get to the solar array
2. Compare, giving a reason, the safety of the solar array with 20 nuclear reactors

Answer 0

1.

2.

Question 1

Why is the sun considered thr PRIMARY SOURCE OF ENERGY for
(I) biofuel
(ii) hydroelectricity

Answer 1

Biofuel … Plants need sun for photosynthesis to grow

Hydroelectricity .. Weather conditions are linked to the sun tidal energy depends on the sun

Question 2

Calculate the cost of using a washing machine rated at 1 kW for 5 hours per week for 7 weeks. The net cost of one unit is 20 cents

Answer 2

1 kW is 1000 W
1000 x 5 x7 =total wats used
Total watts used x .20 = cost

Question 3

The conversion of chemical energy to kinetic energy to potential energy occurs when you walk up a stairs, give 2 more examples of energy conversion and the contexts in which they occur

Answer 3

1. Chemical energy in a battery changes to sound energy when a mobile rings
2. Nuclear energy changes to electrical energy to give us electricity

Question 4

Pick 2 renewable energies. Give one advantage and one disadvantage of each

Answer 4

Energy 1. Solar energy
Advantage: it is free. Disadvantage: solar cells are expensive

Energy 2. Wind energy
advantage: does not cause pollution. Disadvantage: no electricity made on a calm day

Question 5

Give 2 examples showing the sun is our primary source of energy

Answer 5

1: fossil fuels?????????
2: photosynthesis???????

Question 6

Describe a simple experiment to show sound is a form of energy

Answer 6

????????????

Question 7

Name 2 renewable energy sources, excluding sunlight, that are available in Ireland

Answer 7

Wind energy

Hydroelectricity

Question 8

Give two benefits Ireland would get from increasing the use of renewable energy sources

Answer 8

Lessen our need for fossil fuels

We could contribute less to global warming