Question

6).A certain freezing process requires that room temperature be lowered from 40oC at therate of 5oC every hour. What will be the room temperature 10 hours after the processbegins?(7). 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?

Answer 1

Q1)Rate=`-5^0`c/h
Initial timeT=`40^0C`
after 10 hrs=40-(5*10)=`-10^0C`
Q2) 1)4*5+6*(-2)=20-12=8 marks
2)5*5-5*(-2)=25-10=15 marks
3)2*5-5*(-2)=10-10=0 marks.