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Year 11 Science sample

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Question 1 of 5 Earth and beyond

A counter reads 448 counts per minute on wood burnt this week and 112 counts per minute on charcoal dug out of a buried flood layer at a river bend. The half-life of carbon 14 is 5,730 years. How old is the sample?

Counts from the two samples
SampleCounts per minute
Wood burnt this week448
The buried charcoal112
Question 2 of 5 Observing and measuring

A research vessel anchored beside a reef lagoon sends a sound pulse straight down, and the echo returns 80 milliseconds later. Sound travels at 1500 metres per second in seawater. The sounder sits 4 m below the surface. How deep is the water?

Timing the pulse to the bottomVessel over the lagoonPulse and echoSeabedThe pulse makes the trip twiceThe stated time covers the way down and the way back.
Question 3 of 5 Life and living

Ecologists at a grassy woodland reserve measured the energy held by grasses and by grasshoppers over a year. The same share passes on at each step up the chain. How much energy reaches falcons?

Energy measured at a grassy woodland reserve
LevelEnergy in kJ per square metre per year
Grasses40,000
Grasshoppers4,000
Question 4 of 5 Reasoning and problem solving

Two soil suspensions from one property were tested by an agronomist before choosing what to sow in each paddock. How many times as many hydrogen ions are there in the ridge paddock as in the flat paddock?

pH readings from the two samples
SamplepH reading
The ridge paddock5
The flat paddock8
Question 5 of 5 Energy and change

A builder is insulating the ceiling cavity of a demountable classroom at Orange and wants the product that slows heat loss the most. Which one is it?

Insulation products on offer
ProductThicknessConductivity in W per m per KPrice per square metre
Polyester batt176 mm0.040$21
Foam board81 mm0.030$30
Loose fill vermiculite181 mm0.062$16
Glass wool batt111 mm0.038$26
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