Biomedical Engineering Gate 2025 Questions with Answer
Ques 14 GATE 2025
An ideal, massless spring with spring constant 1 N/m (upper panel of the given figure) is cut into 5 equal parts. If two of these parts are connected in parallel (lower panel of the given figure), what is the resultant spring constant in N/m? (rounded off to the nearest integer)
Assume linear behavior of the springs.
Ques 15 GATE 2025
Consider two cuboidal blocks of volume 1 cm3 each, one made of gold and the other of undoped silicon. What will happen to the resistivity of these blocks if the temperature is increased from 300 K to 350 K? Choose one of the following.
Ques 16 GATE 2025
Which one of the following represents the frequency response of a notch filter?
Ques 17 GATE 2025
In the circuit shown below, assuming an ideal op-amp, for an input voltage Vin=1V, the output voltage Vout = ______ (in volts).
Ques 18 GATE 2025
In the electrocardiogram (ECG) of humans, the electrical signature of atrial repolarization is masked by the
Ques 19 GATE 2025
Which one of the following does NOT use piezoelectric transducers?
Ques 20 GATE 2025
A low pass filter with cutoff frequency of 250 Hz is NOT suitable for recording
Ques 21 GATE 2025
The Electroencephalogram (EEG) voltage measured by a test device is 2.4 μV, while the reference device measured it to be 3.0 μV. What is the percentage error of the test device?
Ques 22 GATE 2025
Which of the following statement(s) about pulse oximetry is/are TRUE?
The correct answer is Option A — Oxygenated hemoglobin absorbs less infrared light (900 nm) compared to deoxygenated hemoglobin.
Pulse oximetry works on a beautifully simple principle — oxygenated hemoglobin (HbO2) and deoxygenated hemoglobin (Hb) absorb light differently at two specific wavelengths, and by comparing those absorption differences, we can calculate blood oxygen saturation (SpO2).
The two wavelengths used are red light (~660 nm) and infrared light (~940 nm). Here''s what happens at each:
At red/visible wavelengths (~600-660 nm): Oxygenated hemoglobin absorbs more red light than deoxygenated hemoglobin. This is actually why arterial blood looks bright red — HbO2 strongly absorbs red light. So Option B is false and Option C is true in reality, but let''s confirm against what the question is asking.
At infrared wavelengths (~900-940 nm): Deoxygenated hemoglobin absorbs more infrared light than oxygenated hemoglobin. So oxygenated hemoglobin absorbs less infrared — which is exactly what Option A states. This makes Option A correct and Option D incorrect.
A quick way to remember this — think of it as a crossover. At red wavelengths, HbO2 wins (absorbs more). At infrared wavelengths, Hb wins (absorbs more). The two absorption curves cross near the isobestic point (~805 nm), where both forms absorb equally.
The pulse oximeter exploits this crossover by shining both wavelengths through the finger or earlobe and measuring the ratio of pulsatile absorption changes. That ratio is then mapped to SpO2 using a calibration curve.
Ques 23 GATE 2025
For an 8-bit Digital to Analog Converter (DAC), the binary input 0000 0000 results in 0 V, and 1111 1111 results in 5 V. The output of the DAC for an input of 1011 0111 is ______ (in volts, rounded off to two decimal places).
Ques 24 GATE 2025
What is the output voltage Vout for the circuit shown below? (in volts, rounded off to the nearest integer).
Ques 25 GATE 2025
Resistance R of a thermistor varies as a function of temperature T such that
R(T)=R0exp[β(1/T-1/T0)].
where β=3100 K and, R0 and T0 are positive constants. If the relative error in measuring R is 10%, what is the relative error (in percentage) in measuring 310 K temperature? (rounded off to the nearest integer)
Ques 26 GATE 2025
The frequency of the oscillator circuit shown in the figure below is ______ kHz. (rounded off to two decimal places)
Given: R = 1 kΩ; R1 = 2 kΩ; R2 = 6 kΩ; C = 0.1 µF
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