Physical quantities, units and measurement

Question 1 of 10

A vernier caliper can measure to the nearest

Question 2 of 10

Explain the terms accuracy, precision and significant figures. A student measures the length of a rod as 25.4 cm, 25.5 cm and 25.3 cm. Find the mean length and comment on the precision.

Question 3 of 10

5 km is equal to ___ m.

Question 4 of 10

The SI unit of electric current is the

Question 5 of 10

(a) Distinguish between fundamental and derived quantities, giving three examples of each with their SI units. (b) Use dimensions to show that the equation v² = u² + 2as is dimensionally correct.

Question 6 of 10

Describe how you would determine the density of an irregular stone. State two precautions.

Question 7 of 10

Convert 72 km/h to m/s.

Question 8 of 10

A zero error must be subtracted from readings of instruments that have one.

Question 9 of 10

Derive the dimensions of (a) pressure, (b) power, (c) momentum, and hence state their SI units in base units.

Question 10 of 10

The dimensions of energy are