**Case study Questions in the Class 10 Mathematics Chapter 1 **are very important to solve for your exam. Class 10 Maths Chapter 1 Case Study Questions have been prepared for the latest exam pattern. You can check your knowledge by solving case study-based** **questions for Class 10 Maths Chapter 1 **Real Numbers**

In CBSE Class 10 Maths Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

# Real Numbers Case Study Questions With answers

Here, we have provided case-based/passage-based questions for Class 10 Maths **Chapter 1 Real Numbers**

**Case Study/Passage-Based Questions**

**Question 1:**

Srikanth has made a project on real numbers, where he finely explained the applicability of exponential laws and divisibility conditions on real numbers. He also included some assessment questions at the end of his project as listed below. **(i) For what value of n, 4 ^{n }ends in 0?**

(a) 10 | (b) when n is even |

(c) when n is odd | (d) no value of n |

Answer: (d) no value of n

**(ii) If a is a positive rational number and n is a positive integer greater than 1, then for what value of n, a ^{n} is a rational number?**

(a) when n is any even integer | (b) when n is any odd integer |

(c) for all n > 1 | (d) only when n = 0 |

Answer: (c) for all n > 1

**(iii) If x and yare two odd positive integers, then which of the following is true?**

(a) x^{2} + y^{2} is even | (b) x^{2} + y^{2} is not divisible by 4 |

(c) x^{2} + y^{2} is odd | (d) both (a) and (b) |

Answer: (d) both (a) and (b)

**(iv) The statement ‘One of every three consecutive positive integers is divisible by 3’ is**

(a) always true | (b) always false |

(c) sometimes true | (d) None of these |

Answer: (a) always true

**(v) If n is any odd integer, then n2 – 1 is divisible by**

(a) 22 | (b) 55 | (c) 88 | (d) 8 |

Answer: (d) 8

**Question 2:**

HCF and LCM are widely used in number system especially in real numbers in finding relationship between different numbers and their general forms. Also, product of two positive integers is equal to the product of their HCF and LCM

Based on the above information answer the following questions.

**(i) If two positive integers x and y are expressible in terms of primes as x =p ^{2}q^{3} and y=p^{3}q, then which of the following is true?**(a) HCF = pq

^{2}x LCM

(b) LCM = pq

^{2}x HCF

(c) LCM = p

^{2}q x HCF

(d) HCF = p

^{2}q x LCM

Answer: (b) LCM = pq2 x HCF

**ii) A boy with collection of marbles realizes that if he makes a group of 5 or 6 marbles, there are always two marbles left, then which of the following is correct if the number of marbles is p?**(a) p is odd

(b) p is even

(c) p is not prime

(d) both (b) and (c)

Answer: (d) both (b) and (c)

**(iii) Find the largest possible positive integer that will divide 398, 436 and 542 leaving remainder 7, 11, 15 respectively.**(a) 3

(b) 1

(c) 34

(d) 17

Answer: (d) 17

**(iv) Find the least positive integer that on adding 1 is exactly divisible by 126 and 600.**(a) 12600

(b) 12599

(C) 12601

(d) 12500

Answer: (b) 12599

**(v) If A, B and C are three rational numbers such that 85C – 340A = 109, 425A + 85B = 146, then the sum of A, B and C is divisible by**(a) 3

(b) 6

(c) 7

(d) 9

Answer: (a) 3

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