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Grade 12 · Physics

Grade 12 Physics diagnostic

16 questions on motion & graphs, forces & equilibrium, energy, work & power, momentum & collisions, thermal physics, electricity & circuits and magnetism & induction, plus 2 from Grade 11. Answer what you can, then check your answers to see which topics are secure and what to practise next.

16 questions7 topicsAbout 20 minutesSet 5 of 5

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

1Motion & graphsUse one signed axis. Initial velocity is 16 m/s and constant acceleration is 4 m/s² for 8 s. Find the displacement. Round to 3 decimal places if needed. Answer in m.
m
2Motion & graphsA model cart starts at 28 m/s and slows uniformly at 1 m/s² until rest. Ignore reaction time. Find the stopping time. Round to 3 decimal places if needed. Answer in s.
s
3Forces & equilibriumAn ideal spring obeys F = kx with k = 130 N/m. A force of 76 N is applied within its linear range. Find its extension. Round to 3 decimal places if needed. Answer in m.
m
4Forces & equilibriumA sliding block has normal force 164 N and kinetic friction coefficient 0.6. Find the friction-force magnitude in this model. Round to 3 decimal places if needed. Answer in N.
N
5Energy, work & powerA constant 75 N force acts through a 3 m displacement. The cosine of the angle between them is 1. Find the work by this force. Round to 3 decimal places if needed. Answer in J.
J
6Energy, work & powerA 7 kg object changes speed from 10 m/s to 18 m/s. Find final minus initial kinetic energy. Round to 3 decimal places if needed. Answer in J.
J
7Momentum & collisionsMomentum changes by +47 kg·m/s during 30 ms. Find the signed average net force. Round to 3 decimal places if needed. Answer in N.
N
8Momentum & collisionsA 6 kg object changes signed velocity from -13 m/s to 1 m/s. Find the net impulse on it. Round to 3 decimal places if needed. Answer in N·s.
N·s
9Thermal physicsFor a uniform slab, k = 0.6 W/(m·K), area = 9 m², thickness = 18 cm and temperature difference = 19 K. Assuming steady one-dimensional conduction, find thermal power. Round to 3 decimal places if needed. Answer in W.
W
10Thermal physicsA 760 g sample completely melts at its melting temperature. Its latent heat is 270000 J/kg. Ignore losses. Find energy required. Round to 3 decimal places if needed. Answer in J.
J
11Electricity & circuitsIn a theoretical circuit, 37 Ω and 7 Ω are in series across an ideal 28 V source. Find their total electrical power. Round to 3 decimal places if needed. Answer in W.
W
12Electricity & circuitsA theoretical 24 V ideal source supplies parallel ohmic resistors 31 Ω and 35 Ω. Find total source current. Round to 3 decimal places if needed. Answer in A.
A
13Magnetism & inductionA 62 cm straight wire carries 11 A perpendicular to a uniform field of 2 T. Find magnetic force magnitude. Round to 3 decimal places if needed. Answer in N.
N
14Magnetism & inductionAn ideal AC transformer has primary 1900 turns, secondary 2200 turns and primary voltage 37 V. Find secondary voltage. Paper model only. Round to 3 decimal places if needed. Answer in V.
V

From Grade 11

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

15Electricity & circuits (Grade 11)An ohmic resistor of 30 Ω has potential difference 24 V. Find current. This is a paper calculation, not a construction instruction. Round to 3 decimal places if needed. Answer in A.
A
16Motion & graphs (Grade 11)Signed velocity changes from 13 m/s to 39 m/s in 5 s. Find the average acceleration. Round to 3 decimal places if needed. Answer in m/s².
m/s²