Physics Quiz

Which quantity is a physical quantity?

• atomic number

• efficiency

• number density of charge carriers

• strain

What is the unit of resistance when expressed in SI base units?

• kg⁻¹m⁻²s³A²

• kg⁻¹m⁻²s³A⁻²

• kgm²s⁻³A⁻²

• kgm²s⁻³A²

Which two units are not equivalent to each other?

• Nm and kgm²s⁻²

• Ns and kgms⁻¹

• Js⁻¹ and kgm²s⁻³

• Pa and kgms⁻²

Which pair of units are not the same when expressed in SI base units?

• ms⁻² and Nkg⁻¹

• Ns and kgms⁻¹

• Pa and Nm⁻²

• Vm² and NC⁻¹

What is an alternative way of expressing an energy of 43 dJ?

• 4.3 × 10⁹ mJ

• 4.3 × 10⁶ mJ

• 4.3 × 10⁻³ mJ

• 4.3 × 10⁻³ MJ

Two forces, each of 10N, act at a point P as shown. The angle between the directions of the forces is 120°. What is the resultant force?

• 10N

• 17.32N

• 20N

• 5N

What is the magnitude of the resultant force?

• 5N

• 10N

• 17N

• 20N

A micrometer is used to measure the 28.50 mm width of a plastic ruler. The micrometer reads to the nearest 0.01 mm. What is the correct way to record this reading?

• 0.02850 ± 0.01 m

• 0.0285 ± 0.001 m

• (2.850 ± 0.001) × 10^-2 m

• (2.850 ± 0.001) × 10^-3 m

An analogue ammeter with a range of 0–250 mA is connected into an electrical circuit. The diagram shows the ammeter’s display. What is the reading on the ammeter?

• 76 mA

• 165 mA

• 183 mA

• 190 mA

Two forces, with magnitudes 5.0 N and 12 N, act from the same point on an object. Calculate the magnitude of the resultant force R for the forces acting in opposite directions.

• R = 7 N

• R = 17 N

• R = 12 N

• R = 5 N