Keywords in questionsDescribe

Be clear and concise with steps.

If you are to describe the procedure to derive a conclusion ensure it includes the final procedure taken to record the results.

Keywords in questions

Conclude

Find the aim of the experiment.

Use the phrases used to describe the tabulation or comparing of results to answer .

Use the phrases given in the question.

When the area of plastic sheet increases, the toy soldier takes a longer time to reach the ground.

Repeat the experiment 3 times using toy soldiers of different mass. Keep the area of the plastic sheet and height of release constant. Record the time taken for the toy soldier to reach the ground

What’s wrong

1.Measure the mass and keep adding.2. I would keep everything the same but

change the mass of the soldier each time. I record the time taken to reach the ground.

First, place the magnet close to the outer surface of the plastic tank pointing close at iron disc. Then, slide the magnet upwards slowly to guide the iron disc to the small opening and take out the iron disc.

What’s wrong

1.She could place the magnet at the small opening until the iron disc is attracted.

2.Move the magnet along the surface of the tank until the small opening. Then move the magnet up the small opening without lifting it off the surface of the tank.

Keywords in questions

Explain/Give a reason/How

Ensure main concepts/ideas are given to support your argument.

Suggest an improvement

Ensure suggestions are practical and realistic.Keep to using the given apparatus unless stated otherwise.

Yes. Magnetic force can pass through non-magnetic substance. Oil is non-magnetic. Filling the tank completely with oil does not affect the experiment.

What’s wrong

1.Yes, magnetism can pass through plastic and oil.

2.The amount of oil does not affect if Mary would be able to remove the disc or not.

3.Yes. Full or half tank of oil would not have any effect on the attraction of the magnet and the iron disc.

It minimises the effect of human errors in measurement, and makes the result more reliable.

What’s wrong

1.Repeating the experiment more times could determine the average result of the experiment.

2.So that it would be more accurate.

Air occupied the space in the bottle and needs to escape to provide space for the oil. In Set up A, the funnel fitted the bottle opening exactly and blocked the air from escaping. However, the bottle opening at Set-up B was not blocked and allowed the air to escape freely.

What’s wrong

1.The funnel blocked the escape of air in the bottle.

2.The air in A took more time to come out to make space for the liquid to enter while B need not take much time.

3.The air that occupy space in the bottle of B escapes faster than the air that occupy the space in the bottle of A.

What’s wrong

1.When the oil is poured, there would be a small air gap.

2.When oil is poured into the thin-walled funnel until it is filled, air cannot escape from the bottle while B enable the oil to occupy the space once occupied by air and thus filling us faster that A.

The funnel is set-up A could be raised slightly above the mouth of bottle A.

What’s wrong

1. Increase the size of the hole of the funnel’s mouth.

2. Insert a tube in Set-up A to let the air escape faster.

3.Poke many holes.

● Take time to analyse the set-up and understand how it works

● Link it to Scientific concepts and recall the key terms

Correct or Wrong?

The water would drip into the cup and when it collects enough water, the rod would move downwards. When the cup is being moved downwards, the cup will tilt and water would drop into the container. The other end of the rod would move upwards and hit the block. When it hits the block, it will move back to its original place and the cup would move upwards so to be refilled.

Correct or Wrong?

When the cup moved down, it was emptied into the wooden container. When the cup moved towards the hole, the water dripped out from the hole and into the cup.

Correct or Wrong?

When water from the tank has filled the cup, it will lower and raise the rod. When the rod hit the block, the vibration will shake some water out. Thus the cup will be raised and the cycle starts again.When there is enough water in the tank, the end of the rod will become heavier. The end with the cup will tilt and empty the water. After that happens, the side with the cup will become lighter and tilt back up.

Correct Answer

When the cup is filled, it is heavier and lowers. When the rod hit the block, the water in the cup spilled into the container. The empty cup is lighter now and will rise and return to its original position to be refilled.

Correct or Wrong?

The cup would be completely filled with water faster and water would spill out earlier and the cycle would repeat faster.The cup will be refilled and emptied faster so the wooden rod will hit the block harder and with a louder noise

The cup would be filled up faster, causing the wooden rod to hit the block and produce more ‘clicks’. But after some time, the cycle would be slower as the hole is bigger and more water could drip out at a faster rate and the rate of the water coming from the tap is slow.

Correct Answer

The cup will be filled faster and the rod would hit the block at a faster rate. Thus more ‘clicks’ would be heard.

(or the ‘clicking’ would be faster)

(or rate of ‘clicking’ would be faster)

Correct Answer

Light travels in a straight line and forms shadow when blocked.

Light cannot pass through opaque object.

Correct Answer

b) Give a reason why the length of Meiyin’s shadow changes during the day.

The changing position of the Sun due to the rotation of earth about its axis causes the change in the length of the shadow.

Correct or Wrong?

Heat from the hot stones caused the temperature in the bottle to rise.

Correct Answer

Heat travels from the hotter region to the colder region. Hence the air gained heat from the hot stones. As the bottle is air tight the heat could not escape and caused the temperature of air to rise.

Less electricity is needed to cool the food.

Correct or Wrong?

Less electricity is needed to cool the food.

b)

Correct Answer

If hot food is put in the refrigerator, it will be heat up the surrounding air causing the temperature to increase. Hence more electricity is needed to maintain the temperature of 10 ºC in the refrigerator.

Or

If food is cooled down first, less heat will be transferred to the surrounding air. As the temperature increase will be lesser, less electricity is needed to maintain the temperature of 10 ºC in the refrigerator.

b)

Rod B. It closes and completes the circuit and allows electricity to pass through it to light up the bulb.

Rod B is the best conductor of heat followed by Rod C and then Rod A

A good conductor of electricity is also a good conductor of heat.

Generate possibilities● Will there be an

increase in mass?● Does mass affect

force?● What types of

forces are involved?

The distance y will decrease. The iron ring gets attracted to magnet A when it is placed on top of it. This caused an increase in their combined weight which exerted a greater gravitational force.

The force of repulsion between the magnets and the tracks ensures that there is less friction when the train travels thus allowing the train to travel faster.

Air has occupied space in the container and prevented the water from coming into contact with the dry tissue.

The person inside the container breathes in oxygen. This will cause a decrease in the amount of oxygen after some time and lead to his death.