Physics · May / June 2022 · Paper 41 · Question 5
0625
As printed in the paper
The question as text
Fig. 5.1 shows a kitchen tap that supplies instant boiling water. Fig. 5.1 Cold water passes over an electric immersion heater inside the tap. The boiling point of water is 100 °C.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
5(a)[2]
temperature
at which liquid becomes a gas or liquid and gas exist together
5(b)(i)[2]
1.8 × 105 J
(E =) VIt (in any form) or 230 × 13 × 60 or 230 × 13 or 3000
C1
5(b)(ii)[4]
9.1 × 10–3 kg / s
9.1 × 10–3 kg / s
(ΔT =) 100 – 22 or 78
or (ΔT =) 100 – 22 or 78
C1 m = E / cΔT (in any form) or 1.8 × 105 / (4200 × 78)
or (rate =) P / cΔT (in any form) or m = E / cΔT and E = Pt C1 1.8 × 105 / (4200 × 78 × 60) or
or 3000 / (4200 × 78)
C1 5.5 × 10N or 9.1/9.2 × 10N
or 230 × 13 / (4200 × 78)
or 9.1 / 9.2 × 10N
5(c)[3]
1
if the tap becomes live or if the (live) cable touches the (metal) tap
there is a current to earth / in the earth wire (which blows the fuse)
2
the current (in earth wire) is large and fuse melts / blows / stops current / breaks circuit
Make a free account to save your answers and see your weak topics and ask the AI why a wrong answer is wrong.