Question:
Two statements are given below
Statement--I: An object located at \(30\,\mathrm{km}\) above the sea level is in stratosphere.
Statement--II: The maximum permissible limit of Cd present in drinking water is \(0.05\ \mathrm{ppm}\).
The correct answer is
Two statements are given below
Statement--I: An object located at \(30\,\mathrm{km}\) above the sea level is in stratosphere.
Statement--II: The maximum permissible limit of Cd present in drinking water is \(0.05\ \mathrm{ppm}\).
The correct answer is
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Atmospheric layers:
\begin{itemize}
\item Troposphere: \(0-12\) km
\item Stratosphere: \(12-50\) km
\item Mesosphere: \(50-80\) km
\end{itemize}
The permissible limit of Cd in drinking water is about \(0.003\ \mathrm{ppm}\).
Updated On: Jul 9, 2026
- Statements I, II both are correct
- Statements I and II both are not correct
- Statement I is correct but Statement II is not correct
- Statement I is not correct but Statement II is correct \bigskip
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The Correct Option is C
Solution and Explanation
Step 1: Analyse Statement--I.
The stratosphere extends approximately from \(12\) km to \(50\) km above the Earth's surface.
Since \(30\) km lies within this range, Statement--I is correct.
Step 2: Analyse Statement--II. The maximum permissible limit of cadmium (Cd) in drinking water is \[ 0.003\ \mathrm{mg\,L^{-1}} \; (0.003\ \mathrm{ppm}) \] according to WHO/BIS standards. Hence, \(0.05\ \mathrm{ppm}\) is incorrect.
Step 3: Final conclusion. Statement--I is correct, whereas Statement--II is incorrect. Hence, the correct option is \[ \boxed{(C)} \]
Step 2: Analyse Statement--II. The maximum permissible limit of cadmium (Cd) in drinking water is \[ 0.003\ \mathrm{mg\,L^{-1}} \; (0.003\ \mathrm{ppm}) \] according to WHO/BIS standards. Hence, \(0.05\ \mathrm{ppm}\) is incorrect.
Step 3: Final conclusion. Statement--I is correct, whereas Statement--II is incorrect. Hence, the correct option is \[ \boxed{(C)} \]
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