MCQ BASED QUESTION ON REAL NUMBER FOR POLYTECHNIC AND OTHER EXAMINATION

                     BALAJI STUDY POINT

MCQ -QUESTION FOR MATHS ON REAL NUMBER FOR POLYTECHNIC

Q1: Which of the following has a non-terminating decimal expansion?

(a) 77/210
(b) 23/8
(c) 17/8
(d) 35/50

Q2: The decimal expansion of 141/120 will terminate after how many places of decimals ?

(a) 1
(b) 2
(c) 3
(d) will not terminate




Q3: HCF of  84 and 270 is 

(a) 8
(b) 6
(c) 4
(d) 2

Q4: If p, q are two consecutive natural numbers, then HCF(p, q) is:

(a) q
(b) p
(c) 1
(d) pq

Q5: If HCF if 60 and 168 is 12, what is the LCM

(a) 480
(b) 240
(c) 420
(d) 840

Q6(CBSE 2010): How many prime factors are there in prime factorisation of 5005 ?

(a) 2
(b) 4
(c) 6
(d) 7

Q7: A rational number can be expressed as a terminating decimal if the denominator has factors

(a) 2, 3 or 5
(b) 2 or 3
(c) 3 or 5
(d) 2 or 5

Q8: If p, q are two prime numbers, then LCM(p, q) is :

(a) 1
(b) p
(c) q
(d) pq

Q9: Let x = p/q be a rational number such that prime factorization of q is NOT in the form of 2ⁿ5^m, where m and n are non-negative integers. Then x has a decimal representation which is:

(a) terminating
(b) Non-terminating, repeating
(c) Non-terminating, non-repeating
(d) None of these


Q10: Euclid’s division lemma states that for any two positive integer ‘a’ and ‘b’ there exists unique integers q and r such that a=bq+r where r must satisfy:

(a) 1 ≤  r  < b
(b) 0 < r ≤  b
(c) 0 ≤ r < b
(d) 0 < r < b


Q11: Which of the following is not an irrational number ?

(a) 5 - √3
(b) 5 + √3
(c) 4 + √2
(d) 5 + √9


Q12: Which of the following numbers has terminating decimal expansion?

(a) 37/45
(b) 21/(2³5⁶)
(c) 17/49
(d) 89/(2²3²)

Q13: The mathematician who gave the term 'algorithm'?
(a) Euclid
(b) Gold Bach
(c) Khwarizmi
(d) Gauss


Q14: The decimal expansion of π
(a) is terminating.
(b) is non-terminating and repeating
(c) is non-terminating and non-repeating
(d) None of these



Answers:
1: (a) 77/210
[Hint: For a rational number in the form p/q, such that the prime factors of q are not of the form 2ⁿ5^m, where n and m are non negative integers. Then the rational number has a decimal expansion which is non terminating repeating (recurring).]

2:  (c) 3 [Hint: Rational form of number p/q, where q = 2³5²]

3:  (b) 6

4:  (c) 1

5: (d) 840 [Hint: LCM × HCF = Product of two numbers]

6: (b) 4  [Hint: 5005 = 5×7×11×13]

7: (d) 2 or 5

8: (d) pq

9: (b) Non-terminating, repeating

10:  (c) 0 ≤ r < b

11:(d) 5 + √9 [Hint: √9 = 3, 5 + √9 = 8, a rational number]

12: (b) 21/(2³5⁶) [Hint: for rational number x = p/q, if factors are in the form of 2ⁿ5^m, where n and m are non negative integers, the rational number has a decimal expansion of terminating type.]

13: (c) Khwarizmi

14: (c) is non-terminating and non-repeating

Some question  for checking your calculation

MCQ. Answer of 1⁄3 x 8² + 2² is

1. 7.1667
2. 6.1667
3. 4.1667
4. 5.1667

C

MCQ. Answer of 4² + 8² −3² ⁄ 7 − 9 is

1. (−19.5)
2. (−35.5)
3. (−25.5)
4. (−15.5)

B

MCQ. Answer of following rational number (2.5)² ⁄ (1 − 0.6) ² is

1. 39.06
2. 29.06
3. 15.06
4. 35.06

A

MCQ. In decimals, cubic root of 9 is

1. 6.7
2. 2.08
3. 3.08
4. 4.5

 B

MCQ. On solving following rational number 6.8² − 3.4² + 2.1³ ⁄ 0.5³ + 1.7320, answer will be

1. 18.1694
2. 15.1694
3. 31.1694
4. 22.1694

D