Physics Paper 2 November 2016

Answer this when you sit the paper.

1. A0.5 m/s²
2. B2 m/s²
3. C20 m/s²
4. D10 m/s²

1. A20 s
2. B40 s
3. C5 s
4. D10 s

1. AThe capture of a neutron by a nucleus, forming a heavier isotope of the same element.
2. BThe splitting of a heavy, unstable nucleus into two lighter nuclei.
3. CThe emission of an alpha particle from an unstable nucleus.
4. DThe joining of two light nuclei to form a single, more stable, heavier nucleus.

Answer this when you sit the paper.

1. A2×10⁻⁹ kg
2. B2×10⁻¹³ kg
3. C2×10⁻¹¹ kg
4. D6×10⁻³ kg

1. AThe volume of the ball decreases as air is added.
2. BThe air molecules become heavier as more are added.
3. CThere are more air molecules in the fixed volume, so they collide with the inner walls more frequently.
4. DThe air molecules inside the ball begin to move faster.

1. AThe lower temperature causes the air molecules to move more slowly, so they collide with the walls less frequently and with less force.
2. BThe volume of the ball increases in the cold.
3. CThe number of air molecules inside the ball decreases in the cold.
4. DAir leaks out slowly through tiny pores in the ball's surface.

Answer this when you sit the paper.

1. AWhen the two media have different optical densities.
2. BWhen the angle of incidence is 90° (grazing incidence).
3. CWhen the light is monochromatic.
4. DWhen the angle of incidence is 0° (the light travels along the normal), or the two media have the same optical density.

1. A4 A
2. B60 A
3. C0.004 A
4. D0.25 A

1. A3600 Ω
2. B960 Ω
3. C4 Ω
4. D240 Ω

1. A1920 Ω
2. B320 Ω
3. C480 Ω
4. D1440 Ω

1. Aheating effect, as seen when a resistor or filament lamp warms up
2. Bmagnetic effect, as seen around any current-carrying conductor
3. Cgravitational effect
4. Dlighting effect, as seen in a light-emitting diode

Answer this when you sit the paper.

1. A15 kWh
2. B5 kWh
3. C0.5 kWh
4. D900 kWh

1. AThe resistance is not constant; it decreases as the voltage (and current) increases.
2. BThe resistance is constant at all voltages, since the device obeys Ohm's law and current stays directly proportional to voltage.
3. CThe resistance increases steadily as the voltage increases, the same way it would for a simple fixed resistor.
4. DThe resistance is zero at all voltages above 2 V, because conduction becomes essentially unrestricted once it starts.

1. A500 Ω
2. B1500 Ω
3. C250 Ω
4. D0.5 Ω

Answer this when you sit the paper.

Answer this when you sit the paper.

1. AThe magnetic field at the switch is too weak or wrongly oriented to magnetise the reeds enough for them to attract each other.
2. BThe reeds are made of a non-magnetic material in this position.
3. CThe reeds are permanently repelled apart by an internal spring.
4. DThere is no current flowing anywhere in the bell circuit.

1. AOpening the door directly breaks a wire, completing the bell circuit.
2. BOpening the door disconnects the battery, which triggers the bell circuit.
3. COpening the door increases the strength of the magnetic field without moving the magnet, closing the reeds.
4. DThe magnet, now aligned beneath the switch, magnetises the reeds with opposite (attracting) polarities so they bend together and touch, closing the circuit and sounding the bell.

Answer this when you sit the paper.

1. A300 m
2. B75 m
3. C150 m
4. D37.5 m

1. AThe sonar transmitter itself emits several identical pulses in very quick succession, and each of those pulses produces its own separate echo.
2. BThe pulse reflects only once, but the receiver's circuitry records that single echo multiple times because of electrical signal noise in the wiring.
3. CThe sound reflects off multiple fish (and/or the seabed), each at a slightly different distance, giving echoes at slightly different times.
4. DThe speed of sound in sea water changes randomly during the pulse's journey, so different parts of the same echo arrive at noticeably different times.

1. AAn electron, negatively charged.
2. BElectromagnetic radiation, with no charge.
3. CA helium nucleus, positively charged.
4. DA proton, with no charge.

Answer this when you sit the paper.

1. A1/32
2. B1/16
3. C1/4
4. D1/8

Answer this when you sit the paper.

1. AStretching force is directly proportional to extension only above 72 mm, and unrelated to extension below that point.
2. BStretching force is directly proportional to extension up to 72 mm; beyond 72 mm it is no longer directly proportional.
3. CStretching force is directly proportional to extension over the entire range tested, including beyond the 72 mm mark.
4. DStretching force is inversely proportional to extension over the entire range tested, so doubling the extension halves the force.

1. AIt can respond to and measure rapidly-changing temperatures, and over a wider range.
2. BIt does not need to be calibrated before use, unlike a liquid-in-glass thermometer.
3. CIt can be read directly without any additional measuring instrument such as a voltmeter.
4. DIt is cheaper to manufacture than a liquid-in-glass thermometer, since it uses only thin wires.