GATE IN 2026 Question Paper (07-Feb-2026) (Shift-1)

A glass pH electrode behaves linearly with an output change of 60 mV per unit change in pH. The measurement reference is set such that a solution of pH 6 produces an output of 60 mV. The pH of a solution that results in an output of $-90\text{ mV}$ is _______ .

An analog speech signal contains signals from 200 Hz to 2400 Hz. It is sampled at 6 kHz and quantized with 512 levels for pulse code modulation (PCM). The bit rate will be _____ kbps.

The slope efficiency of a laser diode is 0.5 W/A, and the output optical power at a current of 100 mA is 30 mW. Assuming piece-wise linear characteristics of the laser diode, the threshold current of the laser is ________ mA.

In a linear element, the measured current is $100\text{ mA}\pm 2.5\%$ and the measured voltage is $5\text{ V}\pm 5\%$. Which of the following options show(s) the consumed power?

Which of the following statements is/are correct for a thermocouple?