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Grade 12 · Science

Grade 12 Science diagnostic

15 questions on motion and energy, waves & sound, electricity & circuits, chemistry and biology & genetics, plus 3 from Grade 11. Answer what you can, then check your answers to see which topics are secure and what to practise next.

15 questions5 topicsAbout 15 minutesSet 2 of 5

Skip a question if you do not know the answer. It is better than guessing, because it shows what to practise.

1Motion and energyA perpendicular force of 1040 N acts over 8 m². Find the pressure in Pa.
Pa
2Motion and energyA mass of 24 kg has velocity -18 m/s. Find its signed momentum in kg·m/s.
kg·m/s
3Waves & soundA repeating signal has frequency 181 Hz. Find its period in seconds as a fraction.
s
4Waves & soundA periodic wave has frequency 14 Hz and wavelength 21 m. Find its speed in m/s.
m/s
5Electricity & circuitsThree ideal resistors of 22 Ω, 22 Ω and 28 Ω are in series. Find total resistance in Ω.
Ω
6Electricity & circuitsResistors of 21 Ω and 44 Ω are connected in parallel. Find the equivalent resistance in Ω as an exact fraction or integer.
Ω
7Electricity & circuitsAn ideal ohmic resistor of 9 Ω carries 8 A. Find the voltage across it in V.
V
8ChemistryAn ideal gas occupies 5 L at 390 K. With pressure and amount fixed, find its volume at 780 K in L.
L
9ChemistryA sample has mass 378 g and molar mass 42 g/mol. Find its amount in mol.
mol
10ChemistryDilute 270 mL of a 4.8 mol/L solution to 0.8 mol/L without losing solute. Find the final volume in mL.
mL
11Biology & geneticsFor Aa × aa, what fraction of offspring is expected to be aa under the simple model?
12Biology & geneticsGenetics and inheritance: which term fits this description? A three-nucleotide RNA sequence specifying an amino acid or translation signal.

From Grade 11

These questions check skills from the grade below, so gaps can be spotted early.

13Chemistry (Grade 11)In a simplified isotope exercise, atomic number Z = 11 and mass number A = 17. How many neutrons?
14Biology & genetics (Grade 11)In the stated model, which genotype is heterozygous?
15Motion and energy (Grade 11)Velocity changes from 7 m/s to 55 m/s in 8 s. Find average acceleration in m/s².
m/s²