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GATE2019: 42

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Match the instruments in $Group\; I$ with their corresponding measurements in $Group\; II$.

$$\begin{array}&&\textbf{Group I} & \textbf{Group II}  \\ &\text{P. Manometer} & \text{1. Agitator speed}\\
&\text{Q. Rotameter} & \text{2. Pressure difference} \\
&\text{R. Tachometer} & \text{3. Cell number} \\
&\text{S. Haemocytometer} & \text{4. Air flow rate} \\  \end{array}$$

  1. $P-4, Q-1, R-2, S-3$
  2. $P-3, Q-4, R-1, S-2$
  3. $P-2, Q-4, R-1, S-3$
  4. $P-2, Q-1, R-4, S-3$
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