Q11. 
Ram's age was square of number last year and it will be cube of a number next year. How long must he wait before his age is again a cube of a number? 
A.  10 year 

B.  38 year 

C.  39 year 

D.  46 year 
Q12. 
In an objective examination of 90 questions, 5 marks are allotted for every correct answer and 2 marks are deducted for every wrong answer. After attempting all the 90 questions a students got a total of 387 marks. Find the number of questions that he attempted wrong. 
A.  9 

B.  10 

C.  11 

D.  12 
Q13. 
The ages of Shivali and Tanisha are in the ratio of $11:7$ respectively. After 8 years the ratio of their ages will be $15:11$. What is the difference in years between their ages? 
A.  4 year 

B.  10 year 

C.  6 year 

D.  8 year 
Q14. 
On a scale that measures the intensity of a certain phenomenon, a reading of $n+1$ corresponds to an intensity that is 10 times the intensity corresponding to a reading of $n$. On that scale, the intensity corresponding to a reading of 8 is how many times as great as the intensity corresponding to a reading of 3? 
A.  $500$ 

B.  $3^5$ 

C.  $10^5$ 

D.  $50$ 
Q15. 
The ratio of ages of a father and son is $17:7$ respectively. 6 years ago the ratio of their ages was $3:1$ respectively. What is the father's present age? 
A.  64 

B.  51 

C.  48 

D.  54 