WA1 Practice Paper: Weighted Assessment 1 — mark scheme (print)

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QQ/S2SCI/WA1

Secondary 2 · Lower Secondary Science (G2 / G3)

Mark scheme

Weighted Assessment 1

WA1 Practice Paper · Maximum mark: 30

Notes for markers

Award one mark for each point marked [1], up to the marks shown for the part.
Accept answers worded differently that show the same understanding.
Units are required where the answer line shows one. ecf: allow an error carried forward.

Section A: Multiple-choice questions[10 marks]

Question	Answer
1	AThe book does not start moving, so the downward weight is matched by the upward contact force.	1
2	CEnergy passes from particle to particle through the metal. The metal stays in place.	1
3	BFriction between the wheels and the floor opposes the sliding or rolling motion.	1
4	DA dull black surface takes in more of the Sun’s radiation than a shiny white surface.	1
5	APressure is force divided by area. A smaller area gives a larger pressure for the same force.	1
6	CConvection needs particles that can move and carry energy, which happens in fluids.	1
7	BThe push changes the shape of the plasticine, and the new shape remains.	1
8	DThe metal body passes heat into the food. The plastic handle does not heat up as quickly.	1
9	AHeating makes the metal lid larger, so it loosens on the jar.	1
10	CShiny surfaces reflect radiation, so less energy leaves or enters by radiation.	1

Section B: Structured questions[20 marks]

Question	Answer and marking points	Marks
1(a)	4.0 N upwards. The book is still, so the upward force balances the weight. 4.0 N [1] It balances the weight / the book is not moving vertically [1]	2
1(b)	6.0 − 2.0 = 4.0 N in the direction of the push. 6.0 − 2.0 [1] 4.0 N in the direction of the push [1]	2
1(c)	The book speeds up in the direction of the push. It speeds up / accelerates in the direction of the push [1]	1
	Total for Question 1	5
2(a)	The narrow strap [1]	1
2(b)	Both straps apply the same force. The narrow strap has a smaller area, so the pressure on the shoulder is greater. Same force [1] Smaller area gives greater pressure [1]	2
2(c)	Pressure = force ÷ area = 12 ÷ 0.0002 = 60 000 N/m². Uses pressure = force ÷ area [1] 60 000 N/m² [1]	2
	Total for Question 2	5
3(a)	Conduction [1]	1
3(b)	Particles at the hot end vibrate more. They bump into neighbouring particles and pass on the energy. The particles themselves do not travel along the rod. Hotter particles vibrate more / collide with neighbours [1] Energy is passed on; particles do not travel the length of the rod [1]	2
3(c)	The wax takes longer to melt because glass is a poorer conductor of heat than metal. Longer time [1] Glass conducts heat less well than metal [1]	2
	Total for Question 3	5
4(a)	Air near the heater warms, expands and becomes less dense, so it rises. Cooler, denser air moves in to take its place, and a convection current forms. Warm air rises because it is less dense [1] Cooler air moves in to replace it / a current forms [1]	2
4(b)	A matt black surface. Matt / dull black surface [1]	1
4(c)	A vacuum has no particles, so it stops conduction and convection. Silvered walls reflect radiation. Vacuum stops conduction and convection [1] Silvering reduces radiation [1]	2
	Total for Question 4	5

— End of mark scheme —