SCIENCE PAPER 2

(a) Balls of ice and dust that orbit the Sun.

(b) Animals that spend part of their life in water and part of their life on land.

(c) Medicinal drugs that help to relieve pain such as headache.

(d) All organisms have special characteristics that help them to live in their habitat and these characteristics are called .

(e) One complete orbit around the Sun is called a .

(a) Drugs are chemicals that change the way the body works.

(b) Less than 50% of Brunei Darussalam’s land area is covered by forests.

(c) Mercury is the farthest planet from the Sun.

(d) The life cycle of a frog has four stages.

(e) Tobacco contains substances such as nicotine and tar.

(a) The sun rises in the morning and sets in the evening are an example of a that occurs daily.

(b) A mosquito hatches from each egg and grows just beneath the surface of the water.

(c) People who do not smoke but can breath in the smoke from smokers are called smokers.

(d) We use a to see living things that are too small to see using only our eyes.

(e) A lot of is used every day, but a lot is wasted too.

(f) Fish have special body parts called that help them to get the oxygen they need from water.

(g) A is made up of different parts that work together to perform a function.

(h) All organisms need a place to live and the place where an organism lives is called a .

(i) Large rocks that orbit the Sun are called and most of it can be found in a belt between Mars and Jupiter.

(j) When you get enough , you will have more energy and be able to think and study better.

(a) State a feature of a buffalo and a deer that put them in the same group.

(b) They sort the animals using Table 1. Write the names of the animals above correctly in the table below. You can write the animals more than once in the table.

(i):

(ii):

(iii):

(iv):

(a) Whose diet is less on foods that are high in vitamins?

(b) Which food group is present in Hasnol’s diet but absent in Bakri’s diet?

(c) Who have a better diet to build strong muscles an for body growth?

(d) Who have higher carbohydrates intake in their diet?

(e) Why do we need to take a lot of carbohydrates in our diet every day?

To provide for the body.

(a) if gear D turns anti-clockwise, in which direction will gear B turn?

(b) Give an example of a machine that uses gears.

(a) identify the processes of the state of water.

Process W

Process X

(b) During the process of water cycles, at which stage from W, X, Y and Z is the cloud formed?

(c) Explain why cloud is formed at the stage you answered in (A).

(a) Which battery can you remove so that the bulb will still continue to light up?

(b) Which two batteries should be reconnected to give the brightest bulb?

(c) Why are electrical wires covered with plastic or rubber?

Electrical wires are covered with plastic or rubber insulation to people from coming into direct contact with the electric flowing through the wire.

(i)

(ii)

(a) Name the system labelled A, B and C above:

(A)
(B)
(C)

(b) In system B, name two important gases that are going in and out through this system.

(i) Gas going in:
(ii) Gas going out:

(a) State the energy conversion when the toy was released.

Stored energy -> energy

(b) Ahmad and Yusof wanted to find out whose car could travel farther. Ahmad turned the key six times while Yusof turned the key three times.

(i) whose car would travel farther?

(ii) State one thing Ahmad and Yusof should keep the same to ensure a fair test.

The number of

(c) Explain your answer in part (b)(i):

This will ensure that both toy cars have the same amount of stored in their springs before they are released.

(a) What is happening in Figure 9?

A factory is the lake by dumping toxic waste into the water. The factory also pollutes the air by releasing to the air. 

(b) State two effects of the activity in (a).

1. Pollution: Dumping toxic waste into the lake can the water and make it unsafe for aquatic life, plants, and human consumption.

2. Pollution: Releasing smoke into the air can cause pollution, which can lead to problems, such as asthma, lung , and other health issues.

How does the plant in Figure 10b grow?

It uses to grow?

(a) Which ramp will Ahmad need to use less effort to push the box?

(b) Explain your answer for question (a).

A smooth surface produces less compared to a rough surface, which means less is required to push the box up the ramp.

(c) What type of simple machine does the ramp represent?

(d) Figure 12 shows Ahmad wanting to lift the box to the top without using any ramp. He finds out more effort is needed to move and lift the box to the top. Explain why?

When you lift something straight up, you have to fight against the force of . Gravity is the force that pulls everything down towards the . But when you use a ramp, you can reduce the amount of you need to lift something. The ramp provides a slope that allows the object to be raised more easily, using less .

(e) What type of other simple machine can Ahmad use to lift the box vertically for question (d)?

(f) if Ahmad puts the box on a trolley as shown in Figure 13. what happens to the effort when he pushes the box up the slope?

If Ahmad puts the box on a trolley and pushes it up a slope with a rough surface, it would be easier at first but get as the slope gets steeper or the surface gets rougher.

(g) Explain your answer for question (f).

When Ahmad puts the box on a trolley and pushes it up a slope with a rough surface, the effort required to move the box due to the presence of . Friction is a force that opposes motion and acts in the opposite direction to the applied force.

(h) What type of simple machine does the trolley at question (f) represent?

(i) Type two factors that must be kept the same for the whole set of the experiments.

(i) The at the top of the slope.
(ii) The weight of the .

(i) Why did Hannan pour a layer of oil into container A and container B?

To prevent

(ii) Why do you think there was a change in the water level in container A?

Plants can absorb water from the container through their .

(iii) Why do you think water level in container B stays the same?

The water level in a container without a plant should remain constant because there is no .

(iv) What did Hannan try to find out from this experiment?

To check if the of the plant takes water.

(i) Experiment set up for Plant C and Plant D is a fair test. Describe two things she has done to ensure her experiment is fair.

(ii) What is the height of the plant at the start of the experiment?

(iii) Which plant grows the most?

(iv) Explain your answer in (iii).

Plants need to grow.

(v) What process occurs where green leaves make food for the plant, using water, carbon dioxide and energy from sunlight?