A student measures the resistance of a length of wire. The diagram shows the correct circuit.
RAV
.1
How is the voltmeter connected to the wire R?
[1 mark]
.2
The voltmeter reads 3.0 V. The ammeter reads 150 mA.
Calculate the resistance of the wire.
[3 marks]
.3
The student switches the circuit off between readings. Suggest why.
[2 marks]
5 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A student wants to find the density of a small irregular stone. They have a balance, a measuring cylinder and water.
.1
Describe how the student can find the volume of the stone.
[2 marks]
.2
The water level rises from 50 cm³ to 70 cm³. The mass of the stone is 52 g.
Calculate the density of the stone.
[2 marks]
.3
Suggest one reason the student's value for the volume might be inaccurate.
[1 mark]
7 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A current of 0.25 A flows through a 47 Ω resistor.
.1
Calculate the power transferred in the resistor.
Give your answer to 2 significant figures.
[3 marks]
.2
The p.d. across the resistor is 11.75 V. In one minute, 15 C of charge flows through it.
Calculate the energy transferred in one minute.
[2 marks]
.3
Show that your answers to parts 1 and 2 agree, and explain why.
[2 marks]
6 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A long, straight wire passes vertically through a horizontal card. The current in the wire flows upwards, out of the card towards you as you look down on it. Small plotting compasses are placed on the card around the wire.
.1
Seen from above, which way do the magnetic field lines go round the wire?
[1 mark]
.2
Describe the pattern of the magnetic field lines drawn on the card.
[2 marks]
.3
The current is reversed. Predict what happens to the compass needles.
[1 mark]
.4
The wire is then wound into a long coil (a solenoid). Describe the magnetic field of the solenoid.
[2 marks]
6 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
An electric motor in a lift raises the lift through a height of 12 m in 20 s. The mass of the lift is 800 kg.
Gravitational field strength = 9.8 N/kg.
.1
Calculate the energy transferred to the lift's gravitational potential store.
[2 marks]
.2
Calculate the useful power output of the motor.
[2 marks]
.3
A second motor raises the same lift through the same height in 30 s.
Explain why the second motor has a lower power output.
