If the efficiency of a machine is $90 %$ , this means that $90 %$ of work input has been lost in overcoming friction.

True

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False

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Solution

The correct option is B False
If the efficiency of machine is $90 %$ , this means that $90 %$ of work input to the machine is converted to useful work output.
The remaining $10 %$ of the work is lost in overcoming friction.
Hence, the given statement is false.

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If the efficiency of a machine is 90%, this means that 90% of work input has been lost in overcoming friction.

The correct option is B FalseIf the efficiency of machine is 90%, this means that 90% of work input to the machine is converted to useful work output.The remaining 10% of the work is lost in overcoming friction.Hence, the given statement is false.

If the efficiency of a machine is $90 %$ , this means that $90 %$ of work input has been lost in overcoming friction.

The correct option is B False
If the efficiency of machine is $90 %$ , this means that $90 %$ of work input to the machine is converted to useful work output.
The remaining $10 %$ of the work is lost in overcoming friction.
Hence, the given statement is false.