1. Uncertainties and Measurements - Review

Which of the following is not a fundamental unit?

• Seconds

• Metres

• Amps

• Newtons

Which of these is a fundamental quantity?

• Power

• Speed

• Temperature

• Energy

Which of these represents the prefix 'nano'?

• 10^-3

• 10^-6

• 10^-9

• 10^-12

The amount of nuclear energy contained in 1 kg of uranium is approximately 70 TJ. This is equal to...

• 70,000 J

• 70,000,000J

• 70,000,000,000J

• 70,000,000,000,000J

1 Coulomb, when represented by fundamental/base units, is equal to...

• 1 A

• 1 A s

• 1 A s^-1

• 1 A^-1 s^-1

A rabbit is measured running a distance of 2.5 m in 3.45 seconds. The answer for the speed should be given as

• 2.5 ÷ 3.45 = 0.7246 m s^-1

• 2.5 ÷ 3.45 = 0.724 m s^-1

• C. 2.5 ÷ 3.45 = 0.72 m s^-1

• D. 2.5 ÷ 3.45 = 0.7 m s^-1

The unit [kg m s^-2] is the same as a

• Joule

• Kilogram

• Newton

• Volt

A student takes measurements for the acceleration of gravity on Earth, and obtains the following results:

g = 10.55, 10.57, 10.44, 10.51 ms^-2

These results are:

• Precise and accurate

• Precise but not accurate

• Accurate but not precise

• Neither precise or accurate

A student is measuring the length of a set of pipes. Unfortunately his ruler has been damaged and starts at 0.2cm, which he fails to notice. This damage causes:

• Random and systematic errors

• Random error

• Systematic error

• Neither random or systematic error

The ratio between a MJ and a pJ is:

• 10¹²

• 10¹⁵

• 10¹⁸

• 10²¹