2.7 There was very little free oxygen when life started on Earth. The only organisms that could live in these conditions were ... A amoebas.


C cockroaches.


B bacteria. D dune rats.


2.8 The Hubble Space telescope has the following features: A It is a reflecting radio telescope outside the Earth’s magnetic field. B


It is a refracting radio telescope outside the Earth’s gravitational field.


C It is a reflecting optical telescope outside the Earth’s atmosphere. D It is a reflecting optical telescope outside the Earth’s magnetic field.


Question 3 A circuit consists of two cells in series and two light bulbs in parallel. Each light bulb can be switched on and off by its own switch. 3.1 Draw the circuit diagram.


3.2 Predict what will happen to the brightness of the first two bulbs if a third bulb is added in parallel.


3.3 Give a reason for your answer in Question 3.2. Question 4


These are the results of an investigation on the size of shadows: Distance of object from lamp (cm)


Size of shadow (cm)


20 60


100 140 180 200


4.1 Draw a graph to represent these results. 4.2 Give a possible conclusion for this investigation. State it as a relationship. Question 5


A man looks at a bowl of yellow and blue flowers standing on a table. The bowl is red and the table top is green. 5.1 Name the other three colours that make sunlight. 5.2 What colours are reflected off the bowl?


5.3 What happens to green light when it falls on the blue and yellow flowers?


5.4 Light from the table enters the man’s eye. How does the light get through the lens of the eye?


5.5 Explain how the man is able to see the table. Question 6


Energy from the Sun is produced in a nuclear fusion reaction. 6.1 What fuel is used in a nuclear fusion reaction?


6.2 What two kinds of energy, radiated from the Sun, can we detect with our senses?


6.3 Nuclear reactions produce energy in a very different way to how a fire burns. Explain why nuclear reactions can take place, but a fire cannot burn, in space.


196 Exemplar end-of-year exam


(1) (2)


(2) [5]


(1) (1) (1)


(1)


(4) [8]


150 50 30 21 17 15


(6)


(2) [8]


(2) [16] (2)


(6) (1)


(1) [8]


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