Year 11 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	448, 524, 694
Element B	472, 524, 694
Element C	524, 627, 694
Unknown gas	472, 524, 694

A Element B B Element A 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 K is oldest because it is closest to the surface. B Layer L and Layer M must be the same age because they touch. C Layer N is oldest because it was deposited before the layers above it. 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	80%
36	20%

A 35 B 34 C 36.4 D 34.4

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 6 C pH 8 D pH 10

Year 11 Science sample

Answer the sample questions