Physics Paper 2 November 2018

Answer this when you sit the paper.

1. A0.75 g/cm³
2. B2.33 g/cm³
3. C1.3 g/cm³
4. D0.57 g/cm³

1. A3.0 g/cm³
2. B1.67 g/cm³
3. C0.17 g/cm³
4. D0.3 g/cm³

1. Aefficiency = M.A. − V.R.
2. Befficiency = (V.R./M.A.) × 100%
3. Cefficiency = M.A. × V.R.
4. Defficiency = (M.A./V.R.) × 100%

Answer this when you sit the paper.

1. A80%
2. B96%
3. C98%
4. D100%

1. AThe particles move freely at high speed in all directions
2. BThe particles slide past each other while staying close together
3. CThe particles move in a fixed circular path around a nucleus
4. DThe particles vibrate about fixed positions

1. AThe particles remain stationary except for slight vibration
2. BThe particles vibrate about fixed positions only
3. CThe particles move at high speed in all directions, colliding frequently
4. DThe particles move slowly past each other while remaining in contact

1. AThe tyre volume decreases as the rubber cools, compressing the air
2. BMore air molecules enter the tyre from outside as it rotates
3. CFriction generates heat, raising the air temperature so particles move faster and collide with the tyre wall more often and more forcefully
4. DThe rider's weight forces air to the top of the tyre, concentrating the pressure there

Answer this when you sit the paper.

1. A1.5 cm³
2. B1.0 cm³
3. C0.5 cm³
4. D0.25 cm³

1. AThe density of air is less than the density of water, giving the bubble an upward buoyant force
2. BWater pressure pushes equally in all directions, producing no net force on the bubble
3. CAir bubbles are attracted upward to the surface by gravity
4. DThe diver's movements create a current that pushes the bubbles upward

1. Aradio waves, visible light, ultra-violet, X-rays
2. Bradio waves, ultra-violet, visible light, X-rays
3. Cvisible light, radio waves, X-rays, ultra-violet
4. DX-rays, ultra-violet, visible light, radio waves

Answer this when you sit the paper.

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1. A16.5 m
2. B82.5 m
3. C15 m
4. D33 m

1. A660 m/s
2. B330 m/s
3. C82.5 m/s
4. D16.5 m/s

Answer this when you sit the paper.

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Answer this when you sit the paper.

1. AIncrease the number of turns on the coil (or otherwise increase the current the coil can carry)
2. BReduce the number of turns on the coil
3. CReplace the soft iron core with a permanent magnet
4. DDecrease the cross-sectional area of the coil wire

Answer this when you sit the paper.

1. AElectrons are converted into photons by the deflecting plates before reaching the screen
2. BLight from the heated cathode is focused directly onto the screen
3. CElectrons strike the fluorescent screen, causing it to glow
4. DThe screen absorbs radio waves emitted by the anode

1. AThe cathode absorbs electrons from the anode and releases them randomly in all directions
2. BA heated anode emits electrons; the cathode then decelerates them into a narrow beam
3. CThe screen emits electrons, which a magnetic coil focuses before they reach the cathode
4. DA heated cathode emits electrons by thermionic emission; the anode then accelerates and focuses them into a beam

Answer this when you sit the paper.

1. A6.25 m/s²
2. B2.13 m/s²
3. C4.25 m/s²
4. D8.25 m/s²

1. AThe lorry, because it has greater mass and therefore greater momentum at the same speed
2. BThe car, because its smaller mass lets it decelerate faster
3. CBoth need the same force, since they have the same velocity
4. DThe car, because momentum depends only on velocity, not mass

1. AA hollow beam is always stronger in absolute terms than a solid beam of the same outer diameter
2. BA hollow beam has a greater strength-to-mass ratio, making it lighter for the same strength
3. CA hollow beam is cheaper because it uses more material
4. DA hollow beam has a lower centre of gravity

1. AA truss has a greater strength-to-mass ratio, since unnecessary material is removed, making it more economical
2. BA truss requires more material than a solid beam of the same span
3. CA truss is heavier than a solid beam spanning the same distance
4. DA truss cannot support any load in tension

1. ASteel reinforcement is placed on the side under compression, since concrete cannot resist compression
2. BThe rods are placed for decoration only and do not affect strength
3. CThe position of the rods depends only on the beam's total weight, not on tension or compression
4. DSteel reinforcement is placed on the side under tension, since concrete is weak in tension while steel is strong in tension

1. AIn a circular path around the direction of travel
2. BThe particles do not vibrate; only energy moves
3. CAt right angles (perpendicular) to the direction the wave travels, as in water waves or waves on a string
4. DParallel to (along) the direction the wave travels, as in sound waves

1. ABoth the speed and the wavelength decrease, while the direction of travel is unchanged
2. BBoth the speed and the wavelength increase, while the direction of travel is unchanged
3. CThe speed increases but the wavelength decreases
4. DThe waves stop, since the boundary reflects them entirely

1. A480 m
2. B1500 m
3. C750 m
4. D3000 m

Answer this when you sit the paper.

1. A32 counts per second
2. B8 counts per second
3. C64 counts per second
4. D16 counts per second

1. AAlpha particles have no mass, letting them pass through more gas molecules
2. BAlpha particles have much greater mass and charge and move more slowly, so they ionise more gas molecules per unit path length
3. CAlpha particles move faster than beta particles, giving them less time to interact with gas molecules
4. DAlpha particles are negatively charged, which strongly attracts gas molecules