MDCAT 2026 MCQs

Fission can release neutrons that sustain a chain reaction.
It powers conventional nuclear reactors.

Percentage yield = actual yield ÷ theoretical yield × 100.
(45 ÷ 50) × 100 = 90%.

Fusion powers stars by converting a small amount of mass into energy.
It requires very high temperatures to overcome electric repulsion.

Boyle’s law gives P₁V₁ = P₂V₂.
P₂ = 100×4÷2 = 200 kPa.

Photon energy is E=hf.
E=6.63×10^-34×5×10^14 = 3.315×10^-19 J.

Boyle’s law gives P₁V₁ = P₂V₂.
P₂ = 120×3÷6 = 60 kPa.

Frequency is f=E/h.
F=4.0×10^-19 / 6.63×10^-34 ≈ 6.03×10^14 Hz.

Boyle’s law gives P₁V₁ = P₂V₂.
P₂ = 80×5÷4 = 100 kPa.

Einstein's photoelectric equation gives Kmax=Ephoton-φ.
Kmax=5-2 = 3 eV.

Boyle’s law gives P₁V₁ = P₂V₂.
P₂ = 150×2÷5 = 60 kPa.

Use λ=h/p.
λ=6.63×10^-34 / 6.63×10^-24 = 1×10^-10 m.

The balanced equation fixes the required mole ratio.
Comparison of available amounts shows that O₂ is consumed first.