2,014 exam-style questions with answers and explanations, organised by the official syllabus. Try the samples below, then practise the full bank free.
Which of these is an SI base unit?
Answer: kilogram
The seven SI base units are kg, m, s, A, K, mol and cd. The newton, joule and watt are derived units.
In the kinetic theory of gases, the absolute temperature of an ideal gas is proportional to the average...
Answer: kinetic energy of the molecules
Average translational KE = (3/2)kT, so temperature (in kelvin) is proportional to the average kinetic energy of the molecules.
In a transverse wave, the oscillations are...
Answer: perpendicular to the direction of energy transfer
In a transverse wave the oscillations are perpendicular to the direction of energy transfer (e.g. electromagnetic waves, waves on a string). In a longitudinal wave, such as sound, they are parallel to it.
Two point charges of +1.0 μC each are separated by 0.10 m in vacuum (k = 8.99e9). What is the magnitude of the Coulomb force between them?
Answer: 0.90 N
F = kq₁q₂/r² = 8.99e9 × (1.0e-6)² / (0.10)² = 8.99e9 × 1e-12 / 0.01 ≈ 0.90 N.
Which type of ionising radiation is the most penetrating?
Answer: gamma
Gamma is the most penetrating (needs thick lead/concrete). Alpha is stopped by paper; beta by a few mm of aluminium.
Which of these is an SI base unit?
Answer: kilogram
The seven SI base units are kg, m, s, A, K, mol and cd. The newton, joule and watt are derived units.
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