Year 10 ICAS Science 5-Question Sample

Question 1 of 5 Interpreting

Use the emission-line data. Which element is most strongly supported as the unknown gas?

Emission-line wavelengths

Sample	Bright lines observed (nm)
Element A	445, 521, 691
Element B	469, 521, 691
Element C	521, 624, 691
Unknown gas	469, 521, 691

A Element A B Element C C Element B D No element can be compared because wavelength is not evidence

Question 2 of 5 Reasoning and problem solving

The field notes describe rock layers and an igneous intrusion. Which relative-age conclusion is best supported?

Field sketch notes

Observation	Evidence from the sketch
Top layer	Layer K: shell bed
Cut by intrusion	Layers L, M and N
Not cut by intrusion	Layer K
Relative-age rule	a feature is younger than what it cuts

A The intrusion is the oldest feature because it is deepest in the diagram. B Layer K is older than the intrusion because it is on top. C Layers L, M and N are younger than the intrusion because they touch it. D The intrusion is younger than Layers L, M and N, but older than Layer K.

Question 3 of 5 Natural and processed materials

A team needs a lightweight outdoor support that will be exposed to salt spray and must still carry a moderate load. Which material is the best choice from the table?

Candidate materials for an outdoor support

Material	Density (g/cm3)	Tensile strength (MPa)	Corrosion resistance
A	2.7	360	high in salt spray
B	7.8	435	poor in salt spray
C	1.2	55	high in salt spray
D	8.9	225	moderate in salt spray

A Material A B Material B C Material C D Material D

Question 4 of 5 Predicting and concluding

The graph compares a reaction pathway with and without a catalyst. Which conclusion is best supported?

A The catalyst lowers the activation energy but does not change the final energy of the products. B The catalyst raises the product energy and makes the reaction absorb more energy. C The catalyst changes the reactants into a different starting substance. D The catalyst removes the need for particles to collide.

Question 5 of 5 Interpreting

Use the enzyme-rate data. Which condition is best supported as the optimum pH for this enzyme?

Enzyme reaction rate

Condition	Rate (units/min)
pH 4	14
pH 6	27
pH 8	49
pH 10	21

A pH 4 B pH 8 C pH 6 D pH 10

Year 10 Science sample

Answer the sample questions