Question
In a competitive examination containing 200 questions, 2
marks are awarded for every correct answer and 1 mark gets deducted for every wrong answer. If a student attempted all questions and obtained 97 marks, how many wrong answers must he have given?Solution
Let number of questions with right answers = x ∴ No. of questions with wrong answers = 200 –x ∴ Marks obtained for right answers = 2x ∴ Marks deducted for wrong answers = 200 -x ∴ 2x – (200-x) = 97 ⇒ 3x = 200 + 97 ⇒ 3x = 297 ∴ x= 99 ∴ No. of questions with wrong answers (200 – 99) = 101
A fluorescent light test is particularly useful in detecting which type of seed impurity?
Which mineral is a primary component of limestone?
In the CGMS system, the “B line” serves as the:
Sweet potato aphid attacks mainly on ................................?
Which one of the following is associated with rhizosphere?
The use of Stokes’ law for measurement of the size of soil particle depends on certain simplifying assumptions. These are:
A. Particles must be...
Green ear disease is associated to which of the following crops?
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.Â
Assertion A: Rejuvenation is an effectiv...
During mitosis, the centromere divides at:
Under which section of APEDA Act, the Authority has the power to make regulations?
Relevant for Exams:
