Which two quantities have the same dimension?

Correct answer: a Pressure and stress

Pressure and stress are both force ÷ area = MLT⁻² ÷ L² = ML⁻¹T⁻², so their dimensions are the same.

Why the other options are wrong

• b Work and power: Work is ML²T⁻² and power = work ÷ time = ML²T⁻³; the exponent of T differs.
• c Electric current and luminous intensity: These are two separate fundamental quantities, each with its own dimension, so their dimensions are not the same.
• d Acceleration and speed: Acceleration is LT⁻² and speed is LT⁻¹ (like velocity); the exponent of T differs.