1 B 2 A 3 B 4 D 5 A 6 B 7 C 8 C 9 A 10 C 11 A 12 C 13 C 14 C 15 B 16 C 17 B 18 C 19 A 20 A 21 D 22 A 23 C 24 A PhysicsAndMathsTutor.com 25 B 26 A 27 C 28 D 29 C 30 B 31 A 32 B 33 C 34 B 35 A 36 A 37 D 38 D 39 A 40 A 41 D 42 C 43 D 44 B 45 C 46 C 47 D 48 A PhysicsAndMathsTutor.com 49 C 50 A PhysicsAndMathsTutor.com