2013 DSE Phy Paper 1A MC ans

1) BBCDA
6) DADDD
11) BADAB
16) BADCC
21) ACADC
26) CCCDB
31) ACBAB
36) B

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1(a) 1.071x10^8
(b) 6.61hr
c) Rate of heat transfer decreases as temperature difference decreases with time. (6m)
2(a) 74mm 溫度計果條. (6m)
b)-268℃ absolute zero
3(a) 16000 4000 26000 電動機果題. (7m)
4. F=BQV 1.92X10^-14. (8m)
b) v=BQr/m. as r halved, v halved
5. 程差果題 : 1.5X10^10 HZ 同1.27M. (9m)
6. 實驗題 height正比stopping distance (5m)
7. bungee jump
b)PE to KE to Elastic PE
c) i increase impact time reduce net force ii increase area reduce pressure P=F/A(9m)
8.lens
a) virtual
b)convex as virtual erect magnify
c) f=16.67
d) application magnifying glass. (11m)
9. 7554 YR yup (6m)
10. 7.2V 16度
a) replace with higher resistance voltmeter. (10m)
11. 10.1 度同 558V?
c) decrease (7m)
卷二天文同energy
天文係咪有個半徑唔洗用?
energy mc 如下 A B C D B ? A C 30 LM 同 1400幾銀錢 ??
利申亂做求2MC 19/36