Units. Systems of Units. Fundamental and Derived SI Units Revision Questions

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1.1Units. Systems of Units. Fundamental and Derived SI Units

1. Which of the following sets of units contains only fundamental SI units?

  1. Metre, kilogram, newton, second
  2. Ampere, Celsius degree, square metre, candela
  3. Mole, second, gram, metre
  4. Ampere, kilogram, candela, mole

Correct Answer: D

2. Which statement below is CORRECT?

  1. There are 7 fundamental and an undefined number of derived SI units used in science
  2. All fundamental SI units are related to their multiples or submultiples by powers of ten
  3. The unit of force is a fundamental SI unit
  4. Derived units are obtained when two or more different fundamental SI units are combined with each other

Correct Answer: A

Clarification: Every year scientist make new discoveries in science and, since each new physical quantity discovered has its own definition and unit, there is an undefined number of derived SI units in science. Also, derived units are not obtained only when two or more different units are combined together; they also exist even if we use the same unit more than once, such is the case of surface area or volume.

3. Mrs. Smith weighs 174 lbs and 12 oz. What is her weight in kg? Round up the result to the nearest tenth of kilogram.

  1. 79.0 kg
  2. 79.3 kg
  3. 79.1 kg
  4. 84.4 kg

Correct Answer: B

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