Biomedical Signal Processing MCQ

Q1. What is the typical frequency range of ECG signal?

Correct Answer: B

ECG signals mainly lie within 0.5-150 Hz range.

Q2. Baseline wander in ECG signals is caused mainly by:

Correct Answer: B

Breathing causes baseline shifts.

Q3. Which filter is commonly used to remove high frequency noise?

Correct Answer: A

Low-pass filters remove high frequencies.

Q4. Instrumentational amplifiers have:

Correct Answer: B

High input impedance reduces loading.

Q5. Which filter is used to remove 50/60 Hz power line noise?

Correct Answer: B

Notch filters target specific interference.

Q6. What does the QRS complex in ECG represent?

Correct Answer: B

QRS is ventricular depolarization.

Q7. Which of the following causes muscle artifacts in ECG?

Correct Answer: B

Muscle contractions cause EMG noise.

Q8. Auto-correlation function is primarily used to:

Correct Answer: A

Auto-correlation finds repeating patterns.

Q9. What type of noise is random and unpredictable?

Correct Answer: C

White noise is random.

Q10. Which transform is widely used for biomedical signal analysis?

Correct Answer: B

Fourier transforms analyze frequency.

Q11. Matched filter is used for:

Correct Answer: B

Matched filters detect known waveforms.

Q12. Which method is used for QRS detection in ECG signals?

Correct Answer: A

Pan-Tompkins is a popular QRS detector.

Q13. Sampling frequency for ECG should be at least:

Correct Answer: B

Sampling must meet Nyquist criterion.

Q14. What is meant by “artifact” in biomedical signals?

Correct Answer: B

Artifacts are noise or disturbances.

Q15. Which algorithm can be adaptive for filtering biomedical signals?

Correct Answer: A

Kalman filter adapts to signal.

Q16. What does MMG refer to in biomedical signals?

Correct Answer: A

MMG measures muscle vibrations.

Q17. Which of following removes baseline wander in ECG?

Correct Answer: B

High-pass filters remove low frequency drift.

Q18. Cross-correlation is used to:

Correct Answer: A

Cross-correlation compares two signals.

Q19. Which signal has the highest amplitude?

Correct Answer: C

EMG amplitude is largest.

Q20. Which type of biomedical signal is periodic?

Correct Answer: A

ECG normally periodic.

Q21. In digital signal processing, quantization causes:

Correct Answer: B

Quantization adds noise (quantization noise).

Q22. Which of the following can reduce powerline interference?

Correct Answer: A

Differential amplifiers reject common-mode noise.

Q23. Digital filters are implemented in the:

Correct Answer: C

Digital filtering can be software or hardware-based.

Q24. A band-pass filter passes which frequencies?

Correct Answer: C

Band-pass passes a frequency range.

Q25. Sampling theorem states:

Correct Answer: B

To avoid aliasing, sample at least twice signal.

Q26. ECG signal typically has:

Correct Answer: A

ECG shows PQRST.

Q27. Which device measures EEG signals?

Correct Answer: A

EEG signals recorded by electroencephalograph.

Q28. Which technique improves spatial resolution of EEG?

Correct Answer: B

Source localization techniques help.

Q29. An ideal filter passes:

Correct Answer: B

Ideal filters select desired frequencies.

Q30. The z-transform is used for:

Correct Answer: B

Z-transform processes discrete signals.

Q31. Which signal requires higher sampling frequency?

Correct Answer: C

EMG contains high frequency components.

Q32. What is "signal-to-noise ratio"?

Correct Answer: A

SNR expresses quality of signal.

Q33. Which artifact appears due to electrode movement?

Correct Answer: C

Motion artifacts arise from shifting electrodes.

Q34. Fourier Transform converts time-domain signals into:

Correct Answer: A

FT converts signals to frequency domain.

Q35. The frequency range of EEG is approximately:

Correct Answer: A

Electroencephalograms (EEG) have a frequency range of 0.5 Hz to 100 Hz. EEG measures brain electrical activity using electrodes placed on the scalp. These signals are divided into different frequency bands. Delta waves (0.5–4 Hz) are linked to deep sleep. Theta waves (4–8 Hz) occur during light sleep or relaxation. Alpha waves (8–13 Hz) are seen in a calm, awake state. Beta waves (13–30 Hz) are related to active thinking and focus. GAMMA WALES (30–100 Hz) are associated with higher mental activity, such as problem-solving and perception.

Q36. EMG signals are generated during:

Correct Answer: B

EMG arises from muscle contractions.

Q37. Which of the following is NOT a biomedical signal?

Correct Answer: D

UV light is not a biomedical signal.

Q38. Which noise is NOT typically encountered in biomedical signals?

Correct Answer: D

Cosmic noise is negligible here.

Q39. Which is the simplest digital filter?

Correct Answer: C

Moving average filter is simplest.

Q40. Signal conditioning typically involves:

Correct Answer: A

Signal conditioning amplifies and filters signals.

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