A vernier scale is used with a ruler to measure extensions of a wire. The diagrams show the position of the vernier scale against the ruler before and after a mass is suspended from the end of the wire. What is the extension caused by the mass?

• 0.03cm

• 0.13cm

• 0.53cm

• 1.00cm

Answer explanation

What is the order of magnitude of the diameter of the Earth?

• 1 x 10³ m

• 1 x 10⁵ m

• 1 x 10⁷ m

• 1 x 10⁹ m

Answer explanation

A pendulum has a period of 1.0s.

A stopwatch is started when the pendulum is vertical and is moving to the right, as shown.

Which diagram shows the position and the direction of the pendulum 2.5 s later?

• 
• 
• 
• 

Answer explanation

Which is a scalar quantity?

• displacement

• force

• speed

• velocity

Answer explanation

5 A voltage of 2 millivolts is applied across a resistor causing a current of 4 microampere.

Which row gives the voltage in volts and the current in ampere?

• voltage/V: 0.000002

  current/A: 0.000004

• voltage/V: 0.000002

  current/A: 0.004

• voltage/V: 0.002

  current/A: 0.000004

• voltage/V: 0.002

  current/A: 0.004

Answer explanation

Two forces act at right angles at a point O as shown.

What is the resultant of the forces?

• magnitude: 15 N

  direction: OQ

• magnitude: 15 N

  direction: PR

• magnitude: 21 N

  direction: OQ

• magnitude: 21 N

  direction: PR

Answer explanation

Which pair consists of two vector quantities?

• acceleration and weight

• density and velocity

• energy and force

• pressure and work done

Answer explanation

Which order shows units of energy in the correct order of increasing size?

• J→kJ→mJ→nJ

• mJ→nJ→J→kJ

• nJ→mJ→J→kJ

• MJ→J→kJ→GJ

Answer explanation

The diagram shows the scales on a micrometer screw gauge and a vernier caliper.

What are the readings on the micrometer screw gauge and the vernier caliper respectively?

• 6.77 mm

  1.7 mm

• 6.77 mm

  2.7 mm

• 7.77 mm

  1.7 mm

• 7.77 mm

  2.7 mm

Answer explanation

Which quantity is a base quantity

• area

• speed

• temperature

• weight

Answer explanation