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Year 8 Science sample

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Question 1 of 5 Observing and measuring

A Year 8 class studied onion skin cells. The eyepiece stayed on x10 the whole lesson. On the low power lens the class measured the circle of slide they could see and made it 5.6 mm across. They swung the high power lens in and counted 8 cells stretching right across the circle. How wide is one onion cell?

What the class recorded at each setting

Setting	Objective lens	Width of the circle seen (mm)	Cells across the circle
Low power	x4	5.6	too many to count
High power	x40	not measured	8

A 0.07 mm B 0.7 mm C 0.56 mm D 0.007 mm

Question 2 of 5 Natural and processed materials

Five white powders were tested three ways: heated on a hotplate to find a melting point, heated hard in a test tube to see whether anything new came off, and viewed under a hand lens. Which powder is made of just one kind of atom?

Results of the three tests

Powder	Melting point (C)	Breaks down when heated	Bits seen with a hand lens
Powder K	655	Yes	No
Powder L	no single value	No	Yes
Powder M	no single value	No	Yes
Powder N	420	No	No
Powder P	505	Yes	No

A Powder K B Powder N C Powder P D Powder L

Question 3 of 5 Life and living

Three students sat still for five minutes while their resting heartbeat and the amount of blood pushed out with each beat were recorded. During a shuttle run every student gained 60 more beats each minute and pushed out 18 mL more with each beat. How many more millilitres of blood did Tia's heart move each minute during the run than at rest?

Resting measurements

Student	Heartbeats each minute	Blood pushed out each beat (mL)
Noor	72	64
Hamish	74	74
Tia	82	57

A 1080 B 3420 C 5976 D 1476

Question 4 of 5 Energy and change

A workshop needs a metal for the handle of a camp billy. The handle has to stay cool enough to grab, and it must not rust, because the billy lives in a damp shed. Five rods of different metals were each clamped with one end in the same flame, with a wax blob holding a nail 16 cm along every rod. Which rod should the workshop use?

Same flame, same distance, five metals

Rod	Time for the nail to drop (s)	Rusts in damp air
Rod R	42	Yes
Rod S	66	No
Rod T	91	No
Rod P	128	No
Rod Q	170	Yes

A Rod Q B Rod R C Rod T D Rod P

Question 5 of 5 Earth and beyond

A local history group measured how far the carved faces of four old headstones in one cemetery have worn back, using a depth gauge against the original cut line. All four have stood in the same weather in the same row. How many more millimetres does the sandstone lose in a century than the granite?

Wear measured on four headstones

Stone	Rock	Years standing	Depth worn back (mm)
Stone 1	Sandstone	200	72
Stone 2	Sandstone	250	90
Stone 3	Granite	150	30
Stone 4	Granite	300	60

A 16 B 36 C 20 D 56

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