Select the correct singular or plural noun for each sentence. Albert Einstein's (theory, theories) of relativity revolutionized the world of physics.

Question

Quizplus · Accepted Answer

Albert Einstein is known for two theories of relativity: the special theory of relativity and the general theory of relativity. However, the term "theory of relativity" is commonly used to refer to both collectively, making "theory" the correct singular form in this context.

Select the Correct Singular or Plural Noun for Each Sentence