17. In a quiz competition containing 20 questions, 2 marks are awarded for every correct answer and (-1) marks are awarded for every incorrect answer and 0 for each question not attempted. (1) Pooja gets 15 correct and 3 wrong answers. What is her score? Raju gets 10 correct and 10 incorrect answers. What is his score?
Answers
Answer:
In classical mechanics, Newton's laws of motion are three laws that describe the relationship between the motion of an object and the forces acting on it. The first law states that an object either remains at rest or continues to move at a constant velocity, unless it is acted upon by an external force.
Q7) In a class test containing 10 questions, 5 marks are awarded for every correct answer and (–2) marks are awarded for every incorrect answer and 0 for questions not attempted.
(i) Mohan gets four correct and six incorrect answers. What is his score?
(ii) Reshma gets five correct answers and five incorrect answers, what is her score?
(iii) Heena gets two correct and five incorrect answers out of seven questions she attempts. What is her score?
Solution
Transcript
Solution 7)
(i) Mohan get 4 correct answer = 4\times5\ =20\
He gets 6 incorrect answer = 6\times\left(-2\ \right)=\ -12
Total score = 20-12\ =\ 8\
Thus, mohan get 8 marks in the class test.
(ii) For 5 correct answer = 5\times5\ =\ 25
For 5 incorrect answer = 5\times\left(-2\right)=\ -10
Total score = 25-10\ =\ 15
(iii) Heena get 2 correct answer = 5\times2=\ 10
Heena get 5 incorrect = 5\times\left(-2\right)\ =\ -10
Total score = 10\ -10\ =\ 0
Thus, total score of heena is zero.