CAIE A-Level Physics AS 1.2 Si Units Questions

Practise base quantities, derived-unit algebra, dimensional homogeneity and prefix conversions.

Covered syllabus points

1.2.1—The following SI base quantities and their units: mass (kg), length (m)1.2.2—Derived units as products or quotients of the SI base units and use the 1.2.3—SI base units to check the homogeneity of physical equations 1.2.4—The following prefixes and their symbols to indicate decimal submultiples or

[Maximum number: 1]

Which unit is an SI base unit?

ampere

coulomb

degree Celsius

gram

[Maximum number: 1]

What is a unit of power?

$\mathrm{JC}^{-1}$

$\mathrm{Jm}^{-1}$

$\mathrm{JN}^{-1}$

$\mathrm{J} \mathrm{s}^{-1}$

[Maximum number: 2]

The density $\rho$ of the rock from which the pebble in (b) is composed is given by

\rho=\frac{M r^{n}}{k L}

where n is an integer and k is a constant, with no units, that is equal to 2.094 .

Use SI base units to show that n is equal to -2 .

$\mathrm{kg} \mathrm{m}^{-3}=\mathrm{kg} \times \mathrm{m}^{n} / \mathrm{m}$ or $\mathrm{kg} \mathrm{m}^{-3}=\mathrm{kg} \times \mathrm{m}^{n} \times \mathrm{m}^{-1}$
-3=n-1 and (so) n=-2

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Covered syllabus points

Question 1

Question 2

Question 3