A volt can be defined as a

• coulomb per joule.

• coulomb per second.

• joule per coulomb.

• joule per second.

A trolley, mass 0.50 kg, has a speed of 2.0 m s⁻¹. A second trolley, mass 1.0 kg, has a speed of 2.0 m s⁻¹. The two trolleys are travelling in opposite directions and collide. Which of the following could be a correct value of total momentum, in kg m s⁻¹, after the collision?

• 0

• 1.0

• 2.0

• 3.0

The two resistors shown each have resistance R. Which expression gives the correct resistance between point X and point Y?

• B. R

• C. 2R

• D. R²

An object of mass m is moved from point A on the ground, to point B on a bench of height h as shown in the diagram. Which of the following is a correct expression for the work done on the object?

A capacitor of capacitance C is charged to a potential difference V by a power supply. The energy stored on the charged capacitor is W. What would be the energy stored if the potential difference were 2V?

A light-dependent resistor (LDR) and resistor are connected in series with a 6V battery as shown. A voltmeter measures the potential difference across the LDR. In daylight the voltmeter reads 3.0V. Which reading is most likely if the circuit is now in total darkness?

• a little above 0 V

• a little below 3 V

• a little above 3 V

• a little below 6 V

A circuit is set up as shown in the diagram. Lamps X and Y are identical. The coil has a soft iron core. The resistor and the coil have the same resistance. The switch is closed and lamp X lights instantly. Which statement best describes lamp Y after the switch is closed?

• A) Lights after a delay with a final brightness less than X

• B) Lights after a delay with a final brightness the same as X

• C) Lights instantly with less brightness than X

• D) Lights instantly with the same brightness as X

The alpha particle scattering experiment led to a number of observations and conclusions. Which row in the table gives a correct observation and corresponding conclusion from the alpha particle scattering experiment?

• A. Most alpha particles come straight back. | The nucleus is charged.

• B. Most alpha particles come straight back. | The atom is mainly empty space.

• C. Most alpha particles go straight through. | The atom is mainly empty space.

• D. Most alpha particles go straight through. | The nucleus is charged.

A mass is attached to a light thread which is fixed at X. The mass is moving at constant speed in a horizontal circle, centre O. Which of the following is a correct free-body force diagram for this mass?

• A

• B

• C

• D

The current-potential difference graphs for a resistor and a thermistor are shown. The resistor and thermistor are connected in series to a 6 V battery. What is the current, in amps, in the resistor?

• 0.5

• 1.0

• 1.5

• 2.0