2 What is the voltage at point c just before Q2 switches off? Select one of ... A) 0 V. B) +0.6 V. C) Less than +0.6 V. D) -11 V.

3 What is the voltage at point c just after Q2 switches off? Select one of ... A) 0 V. B) -11 V. C) +0.6 V. D) +12 V.

4 What happens to Q1 when Q2 switches off? Select one of ... A) It is destroyed by the reverse voltage. B) It switches off. C) Nothing. D) It switches on.

5 What then is the voltage at point a? Select one of ... A) +12 V. B) 0 V. C) +0.6 V. D) -11 V.

6 In what way does the new voltage at point a affect Q2? Select one of ... A) Turns it fully off. B) There is no effect. C) Turns it back on again. D) Turns it partly on.

7 What is the route of the main flow of current when Q1 is off? Select one of ... A) Through R3 to charge C1. B) Through R4 to charge C2. C) Through R1 and C1 to the base of Q2. D) Through R2 and Q2.

8 What happens to the voltage at the base of Q1 when Q1 is off? Select one of ... A) Stays steady at 0 V. B) Rises slowly to 0.6 V. C) Rises rapidly to +12 V. D) Falls to -11 V.

9 When does Q1 switch on? Select one of ... A) When Q2 switches off. B) When the voltage at its collector reaches 0 V. C) When Q2 switches on. D) When the voltage at its base reaches 0.6 V.

10 What happens to Q2 when Q1 switches on? Select one of ... A) Nothing. B) It switches on. C) Its base is pulled down to -11 V. D) Its base is pulled down to 0 V.