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	410, 486, 656
Element B	434, 486, 656
Element C	486, 589, 656
Unknown gas	486, 589, 656

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

Question 2 of 5 Reasoning and problem solving

The diagram shows an undisturbed sequence of rock layers. Which conclusion about relative age is best supported?

A Layer A is oldest because it is closest to the surface. B Layer D is oldest because it was deposited before the layers above it. C Layer B and Layer C must be the same age because they touch. D Relative age cannot be inferred unless every fossil is named.

Question 3 of 5 Natural and processed materials

Use the isotope data. Which relative atomic mass is closest to the weighted mean?

Isotope abundance

Isotope mass	Relative abundance
34	70%
36	30%

A 35 B 34.6 C 34 D 36.6

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

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	48
pH 6	25
pH 8	32
pH 10	23

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

Year 10 Science sample

Answer the sample questions