MCQ PracticeWhich one of the following option is used for checking that the string is NULL string?Subject: Computer Science EngineeringTopic: UnixA-aB-oC-zD-nCorrect Answer: CPractice QuizBack to MCQsRelated MCQsCurrent flows in a circuit whenEighttenths coulomb passes a point in 4 s. The current in amperes isThe unit of electrical charge is the