1) In what year was the 555 timer IC first introduced? a) 1965 b) 1971 c) 1980 d) 1990 2) How many pins does the 555 timer IC have? a) 6 b) 8 c) 10 d) 12 3) Which pin functions as the OUTPUT pin of the 555 timer? a) Pin 1 b) Pin 3 c) Pin 4 d) Pin 8 4) Which mode produces a continuous waveform without external triggering? a) Monostable b) Astable c) Bistable d) Schmitt Trigger 5) The main function of a Schmitt Trigger is to: a) Generate a single pulse b) Filter noisy analog input signals c) Produce a square wave d) Amplify current only 6) In monostable mode, the pulse duration is given by the formula: a) T = 0.69 RC b) T = 1.1 RC c) T = 2RC d) T = 5RC 7) In astable mode, the capacitor charges through: a) RA only b) RB only c) RA + RB d) No resistor 8) Duty cycle in an astable circuit refers to: a) The time the output is LOW b) The time the output is HIGH in one cycle c) The supply voltage d) The resistor value 9) Which mode has two stable output states? a) Astable b) Monostable c) Bistable d) Schmitt Trigger 10) Which pin is used as the reset input in a 555 timer? a) Pin 2 b) Pin 3 c) Pin 4 d) Pin 7

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