Measurements A-level MCQs

Which one of the following pairs comprises two SI base units?

• ampere, degree celsius

• ampere, kelvin

• coulomb, degree celsius

• coulomb, kelvin

Which one of the following lists contains only SI base units?

• kelvin, metre, mole, ampere, kilogram

• kilogram, metre, second, ohm, mole

• kilogram, newton, metre, ampere, ohm

• newton, kelvin, second, volt, mole

Which pair does not contain any SI base units?

• ampere, mole

• coulomb, metre

• newton, ohm

• second, volt

In terms of the base units of mass, length and time, the kg, m and s, what are the base units of work, the joule (J)?

• kg m⁻¹ s²

• kg m² s⁻²

• kg m² s⁻¹

• kg s⁻²

When a steel sphere of radius r falls at speed v through a liquid, it experiences a drag force F given by F = arv, where a is a constant. Which one of the following is a suitable SI unit for a?

• N

• N s⁻¹

• N m² s⁻¹

• N m⁻² s

What could be a correct expression for the speed of ocean waves in terms of its wavelength λ, the depth h of the ocean, the density ρ of sea-water, and the acceleration of free fall g?

The relationship between four physical quantities is given by the equation P = Q – RS. Given that the equation is homogeneous, which of the following statements must be correct?

• P, Q, R and S all have the same units.

• P, Q, R and S are all scalar quantities.

• The product RS has the same units as P and Q.

• The product RS is numerically equal to (Q – P).

Which one of the following expressions has different units from the other three?

• density × volume × velocity

• rate of change of momentum

• the Young modulus × area

• weight

What are the SI base units of pressure?

• kg m s⁻¹

• kg m⁻¹ s⁻²

• kg m² s⁻²

• kg m⁻² s⁻¹

What are the SI base units of specific heat capacity?

• m s⁻² K⁻¹

• m s⁻¹ K⁻¹

• m² s⁻² K⁻¹

• m² s⁻¹ K⁻¹