CIE iGCSE Co-Ordinated Science C9.3 Alloys and their properties Exam Style Questions Paper 3
Question
(a) Train track is made of lengths of steel rails with small gaps between them.
Fig. 9.1 shows some train track.
(i) Suggest why gaps are left between the steel rails.
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(ii) A steel rail has a volume of 0.13m$^{3}$.
The density of steel is 7900kg/m$^{3}$.
Calculate the mass of the steel rail.
mass = …………………………………………….. kg
(b) (i) A train travels along the track for 600s.
The train starts from rest and accelerates to a speed of 12.5m/ s in 200s.
The train then travels at a constant speed for 300s before slowing down and stopping after a further 100s.
Complete the speed–time graph shown in Fig. 9.2 to show the motion of the train.
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(ii) During the journey, the train engine transfers 5 × 10$^{9}$ J of energy to the train.
State the work done on the train by the engine.
work done = ………………………………………………. J
(c) Nuclear waste is carried by trains.
Nuclear waste emits ionising radiation.
(i) State one harmful effect of ionising radiation on human health.
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(ii) Suggest how the nuclear waste is stored safely during the train journey.
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(d) The headlamps of a train produce visible light.
Visible light is part of the electromagnetic spectrum.
Fig. 9.3 shows an incomplete electromagnetic spectrum.
Complete Fig. 9.3 to show all the parts of the electromagnetic spectrum.
▶️Answer/Explanation
Ans: 9(a)(i) to allow for expansion ;
so rails are not damaged / in hot weather ;
9(a)(ii) mass = density × volume (in any form) or 7900 × 0.13 ;
1000 (kg) or 1027 (kg) ;
9(b)(i) horizontal section correct ;
slowing down section taking 100 s ;
9(b)(ii) 5 × 10$^{9}$ (J) ;
9(c)(i) cancer / radiation burns / AVP ;
9(c)(ii) lead lined container ;
9(d)
three correct ;
in correct order ;