No standard is optimal for all objectives, but attainable standards present a best compromise. True or False?

It is true because Attainable standards in standard costing, are attainable under current conditions that have an element of inefficiency. Usually it is better to use currently attainable standards than optimal standards because attainable standards may discourage employees less and motivate them to perform better.

Answer is 

True

Objectives are more specific but may or may not be attainable. The term"standard" is usually reserved for statements of intent that are both specific and attainable. Thus standards are a type of objective. All standards are objectives, but not all objectives are standards.