Question
In a competitive examination containing 100
questions, 1 mark is awarded for every correct answer and ½ mark gets deducted for every wrong answer. If a student attempted all questions and obtained 79 marks, how many wrong answers must he have given?Solution
Let number of questions with right answers = x ∴ No. of questions with wrong answers = 100 – x ∴ Marks obtained for right answers = x ∴ Marks deducted for wrong answers = (100 - x)/ 2 ∴ x - (100 - x) / 2 = 79 ⇒ 2x - 100 + x/ 2 = 79 ⇒ 3x - 100 = 158 ⇒ 3x = 258 ∴ x = 86 ∴ No. of questions with wrong answers (100 – 86) = 14
Banana is propagated by
Pithiness in radish arises due to _____Â
Lycopene development in tomato is adversely affected when temperature goes beyond ___
The product formed by the fermentation of any green plant material in the absence of air is known as
Vascular bundles in dicot stem are
Which of the following fruit crops is known for its high salt tolerance?
In rose pruning time in rose growing area is -
Botanical name of Lemon grass :
King of Pippin is the variety of ......
Among the following vegetables, which one is viviparous in nature.
Relevant for Exams:
