There are two boxes A & B. Cell phones are kept in both the boxes, all air is sucked from box A and then closed by a device. While box B is simply closed by a device without sucking air from it. A call is made simultaneously on both the phones, but sound comes only from box B. This is because:

Statement 1: In box B there are air particles to vibrate but in box A there is a vacuum.
Statement 2: Sound needs a medium for propagation.

Statement 1 is true and statement 2 is the correct explanation of statement 1

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Statement 1 is true but statement 2 is not the correct explanation of statement 1

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Statement 1 is true but statement 2 is false

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Statement 1 is false but statement 2 is true

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Solution

The correct option is A
Statement 1 is true and statement 2 is the correct explanation of statement 1

In box A, there are no air particles to vibrate, so sound does not propagates in box A and no sound is heard. But in box B there are air particles to vibrate and hence sound propagates.

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Similar questions

9 C_{3}

9 C_{3}

1

\to A = 2^i + 3^j + 6^k, \to B =^i +^j - 2^k

\to C =^i + 2^j +^k

| \to A \times (\to A \times (\to A \times \to B)) \cdot \to C | = 243

2

| \to A \times (\to A \times (\to A \times \to B)) \cdot \to C | = | \to A |^{2} | [\to A \to B \to C] |

C - O

C - O

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