4
D
5
D
6
C
7
A
8
C
9
B
10
C
11
B
12
C
13
D
14
B
15
B
16
B
17
D
18
A
19
C
20
D
21
B
22
D
23
C
24
B
25
A
26
B
27
D
PhysicsAndMathsTutor.com
28
D
29
C
30
C
31
D
32
B
33
C
34
B
35
A
36
B
37
D
38
C
39
B
40
C
41
C
42
A
43
C
44
B
45
C
46
B
47
A
48
A
49
D
50
B
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