A(n) ______ is a set of interrelated hypotheses concerning a particular phenomenon.

A) psychological law
B) theory
C) observation
D) operational definition

All of the following are principles that explain the functioning of psychic energy except

A) differentiation.
B) opposites.
C) equivalence.
D) entropy.

Joseph is one of the top cricketers in his league, but last week he was out for a duck. When he left the pitch he smashed the water cooler with his bat. According to Freud, Joseph may be unconsciously dealing with his anger at himself by using the defence mechanism of

A) projection.
B) reaction formation
C) rationalisation.
D) displacement.