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  1. Find the length of the longest rod that can be placed in a hall of 10 m length, 6 m breadth and 4 m height.
    1. 2√38 m
    2. 4√38 m
    3. 2√19 m
    4. 19 m
Correct Option: A

The length of the longest rod = The diagonal of the hall
= √l² + b² + h²
= √10² + 6² + 4² = √100 + 36 + 16
= √152 = √2 × 2 × 38
= 2√38 m


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