There are two electric bells B1 and B2. When the buttons of these two bells are pressed, the following observations are made:

Bell B1 rang multiple times.

Bell B2 rang only once.

What can be said about the bells based on these observations?

Only B1 has the adjusting screw.

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Only B2 has the adjusting screw.

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Both B1 and B2 have adjusting screws

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None of the above.

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Solution

The correct option is A Only B1 has the adjusting screw.

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There are two electric bells B1 and B2. When the buttons of these two bells are pressed, the following observations are made: Bell B1 rang multiple times. Bell B2 rang only once. What can be said about the bells based on these observations?

The correct option is A Only B1 has the adjusting screw.

There are two electric bells B1 and B2. When the buttons of these two bells are pressed, the following observations are made:

Bell B1 rang multiple times.

Bell B2 rang only once.

What can be said about the bells based on these observations?