Case Study Questions for Class 9 Maths Chapter 1 Real Numbers

Case Study Questions for Class 9 Maths Chapter 1 Real Numbers

Case Study Questions:

Question 1:

Himanshu 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. Answer them.

(i) For what value of n, 4ⁿ ends in 0?

(a) 10
(b) when n is even
(c) when n is odd
(d) no value of n

➤ Show Answer

Answer: (d)

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

➤ Show Answer

Answer: (c)

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

(a) x²+y² is even
(b) x²+y² is not divisible by 4
(c) x²+y² is odd
(d) both (a) and (b)

➤ Show Answer

Answer: (d)

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(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

➤ Show Answer

Answer: (a)

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

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

➤ Show Answer

Answer: (d)

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