AS 1.1 Physical Quantities & Units

Question 1 Which of the following is an SI base unit?

• A Current
• B Gram
• C Kelvin
• D Volt

Question 2 Which definition is correct and uses only quantities rather than units?

• A Density is mass per cubic metre
• B Potential difference is energy per unit current
• C Pressure is force per unit area
• D Speed is distance travelled per second

Question 3 Five energies are listed below. 5 kJ 5 mJ 5 MJ 5 nJ Starting with the smallest first, what is the order of increasing magnitude of these energies?

• A 5kJ→5mJ→5MJ→5nJ
• B 5nJ→5kJ→5MJ→5mJ
• C 5nJ→5mJ→5kJ→5MJ
• D 5mJ→5nJ→5kJ→5MJ

Question 4 What is a reasonable estimate of the average gravitational force acting on a fully grown woman standing on the Earth?

• A 60 N
• B 250 N
• C 350 N
• D 650 N

Question 5 Which product-pair of metric prefixes has the greatest magnitude?

• A pico x mega
• B nano x kilo
• C micro x giga
• D milli x tera

Question 6 Which pair contains one vector and one scalar quantity?

• A displacement acceleration
• B force kinetic energy
• C momentum velocity
• D power speed

Question 7 Which statement includes a correct unit?

• A energy = 7.8 Ns
• B force = 3.8 Ns
• C momentum = 6.2 Ns
• D torque = 4.7 Ns

Question 8 Which quantity can be measured in electronvolts (eV)?

• A electric charge
• B electric potential
• C energy
• D power

Question 9 Two physical quantities P and Q are added together. The sum of P and Q is R, as shown in the diagram. Which quantity could be represented by P and by Q?

• A kinetic energy
• B power
• C speed
• D velocity

Question 10 The arrow represents the vector R. Which diagram does not represent R as two perpendicular components?

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