Analog Integrated Circuits – MCQs

1. : What does IC stand for in electronics?
(A) Integrated Channel
(B) Input Current
(C) Integrated Circuit
(D) Instantaneous Current

2. : Which component is the heart of analog integrated circuits?
(A) Transformer
(B) Operational Amplifier (Op-Amp)
(C) Digital Counter
(D) Microprocessor

3. : What is the ideal input impedance of an op-amp?
(A) 0 Ω
(B) 1 Ω
(C) Infinite
(D) 100 kΩ

4. : What is the ideal output impedance of an op-amp?
(A) Infinite
(B) High
(C) Low
(D) Zero

5. : Which of the following is a typical application of an op-amp?
(A) Signal amplification
(B) Memory storage
(C) Data conversion
(D) Pulse generation

6. : In a non-inverting amplifier, the input signal is applied to:
(A) Inverting terminal
(B) Output terminal
(C) Non-inverting terminal
(D) Power supply

7. : A voltage follower circuit has a voltage gain of:
(A) 0
(B) 1
(C) 10
(D) Infinite

8. : What is the typical open-loop gain of an op-amp?
(A) 1
(B) 10
(C) 100
(D) Greater than 100,000

9. : What type of feedback is used in linear op-amp applications?
(A) Positive feedback
(B) Negative feedback
(C) No feedback
(D) Mixed feedback

10. : Which IC is commonly used as a timer?
(A) 741
(B) 555
(C) 7805
(D) LM317

11. : In a 555 timer IC, the threshold voltage is:
(A) 1/3 Vcc
(B) 2/3 Vcc
(C) Vcc
(D) 0

12. : The 741 op-amp is typically powered by:
(A) 5V single supply
(B) 9V single supply
(C) Dual ±15V supply
(D) 3.3V battery

13. : Which of the following ICs is a voltage regulator?
(A) 555
(B) 741
(C) 7805
(D) 4017

14. : Which configuration provides unity gain in an op-amp?
(A) Inverting amplifier
(B) Comparator
(C) Voltage follower
(D) Summing amplifier

15. : Which of the following is a common application of analog ICs?
(A) Audio amplifiers
(B) Digital clocks
(C) ROM
(D) Flip-flops

16. : What is the function of a comparator circuit?
(A) Multiply signals
(B) Compare voltages
(C) Store charge
(D) Filter signals

17. : The output of an ideal comparator is:
(A) Continuous
(B) Sinusoidal
(C) Saturated (either high or low)
(D) Triangular

18. : What is the role of a capacitor in an integrator circuit using op-amps?
(A) To amplify the signal
(B) To differentiate the signal
(C) To integrate the signal
(D) To act as a buffer

19. : Which of the following ICs can be used to build a Schmitt trigger?
(A) 741
(B) 555
(C) 4011
(D) 4093

20. : The power dissipation in analog ICs is primarily due to:
(A) Clock pulses
(B) Static current
(C) Bias currents and quiescent currents
(D) Magnetic fields

21. : What does PSRR stand for in op-amp specifications?
(A) Power Supply Regulation Ratio
(B) Power Supply Rejection Ratio
(C) Pulse Signal Reduction Ratio
(D) Positive Supply Reset Range

22. : What happens when an op-amp is used with positive feedback?
(A) Acts as an amplifier
(B) Acts as a follower
(C) Acts as an integrator
(D) Acts as a comparator or oscillator

23. : What determines the frequency of oscillation in a 555 timer astable mode?
(A) Voltage alone
(B) Capacitor only
(C) Resistor and capacitor values
(D) Power supply

24. : What is the function of offset null in an op-amp like the 741?
(A) Increase gain
(B) Filter noise
(C) Remove input offset voltage
(D) Control bandwidth

25. : Which of the following is NOT a typical feature of analog ICs?
(A) Continuous signal processing
(B) High speed switching
(C) Amplification
(D) Filtering