CIE iGCSE Co-Ordinated Science P1.1 Physical quantities and measurement techniques Exam Style Questions Paper 3
Question
(a) A train travels between two stations X and Y.
Fig. 6.1 shows a speed–time graph for the journey.
(i) State the time taken for the journey from station X to station Y.
time = ………………………………………………. s
(ii) On Fig. 6.1, mark with the letter C a point on the graph when the train is travelling at a constant speed.
(iii) Calculate the distance travelled by the train between station X and station Y.
distance = ………………………………………………m
(b) Fig. 6.2 shows some railway track.
Railway track is made of lengths of steel rails with small gaps between them.
(i) Explain why leaving gaps in the rails avoids damage to the track in hot weather.
………………………………………………………………………………………………………………………….
………………………………………………………………………………………………………………………….
(ii) A length of steel rail has a weight of 10270N.
The density of steel is 7870kg/m$^{3}$.
Calculate the volume of steel used to make the steel rail.
The gravitational force g on unit mass is 10N/kg.
volume = ……………………………………………. m$^{3}$
▶️Answer/Explanation
Ans : 6(a)(i) 1200 (s) ;
6(a)(ii) anywhere between 200 s and 800 s ;
6(a)(iii) idea of area under graph ;
25× 200× 0.5 + 25× 600 + 25× 400× 0.5 or 2500 + 15 000 + 5000 ;
= 22 500 (m) ;
6(b)(i) gap allows track to expand / stops rail buckling when track expands ;
6(b)(ii) mass of rail = 1027 kg ;
volume = mass/density (in any form) or 1027 / 7870 ;
= 0.13 (m$^{3}$) ;