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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 1 of 5

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

1Motion & graphsIn a model without air resistance, an object is launched vertically upward at 51 m/s on a model planet where g = 5 m/s². Find its time to maximum height. Round to 3 decimal places if needed. Answer in s.
s
2Motion & graphsIn one dimension, u = 11 m/s and constant a = -2 m/s². Find the signed velocity after 11 s. Round to 3 decimal places if needed. Answer in m/s.
m/s
3Forces & equilibriumA sliding block has normal force 245 N and kinetic friction coefficient 0.3. Find the friction-force magnitude in this model. Round to 3 decimal places if needed. Answer in N.
N
4Forces & equilibriumAn ideal spring obeys F = kx with k = 600 N/m. A force of 4 N is applied within its linear range. Find its extension. Round to 3 decimal places if needed. Answer in m.
m
5Energy, work & powerAn ideal linear spring has k = 640 N/m and extension 9 cm. Find the stored elastic energy. Round to 3 decimal places if needed. Answer in J.
J
6Energy, work & powerA 20 kg object changes speed from 7 m/s to 6 m/s. Find final minus initial kinetic energy. Round to 3 decimal places if needed. Answer in J.
J
7Momentum & collisionsA 8 kg object changes signed velocity from 15 m/s to -9 m/s. Find the net impulse on it. Round to 3 decimal places if needed. Answer in N·s.
N·s
8Momentum & collisionsCarts 3 kg at 14 m/s and 9 kg at -4 m/s collide and stick. Velocities share one signed axis; external impulse is zero. Find their final velocity. Round to 3 decimal places if needed. Answer in m/s.
m/s
9Thermal physicsFor a uniform slab, k = 0.8 W/(m·K), area = 6 m², thickness = 20 cm and temperature difference = 33 K. Assuming steady one-dimensional conduction, find thermal power. Round to 3 decimal places if needed. Answer in W.
W
10Thermal physicsA 0.1 kg sample with specific heat 500 J/(kg·°C) warms by 17 °C. No phase change or heat loss occurs. Find energy supplied. Round to 3 decimal places if needed. Answer in J.
J
11Electricity & circuitsTwo branches are connected in parallel to a battery. The branch currents are 0.7 A and 1 A. What current flows through the battery? (Assume ideal wires and an ideal battery.)
A
12Electricity & circuitsA theoretical 28 V ideal source supplies parallel ohmic resistors 3 Ω and 31 Ω. Find total source current. Round to 3 decimal places if needed. Answer in A.
A
13Magnetism & inductionA 800-turn coil has flux change 31 mWb per turn over 450 ms. Find average induced emf magnitude. Round to 3 decimal places if needed. Answer in V.
V
14Magnetism & inductionAn ideal AC transformer has primary 600 turns, secondary 2300 turns and primary voltage 33 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.

15Motion & graphs (Grade 11)Signed velocity changes from 7 m/s to 27 m/s in 10 s. Find the average acceleration. Round to 3 decimal places if needed. Answer in m/s².
m/s²
16Forces & equilibrium (Grade 11)On a weightless balanced beam, 21 N acts 9 m left of the pivot. What downward force at 8 m right balances it? Forces are perpendicular to the beam. Round to 3 decimal places if needed. Answer in N.
N