Important Questions – 2012
Class – X
Subject –Mathematics (Real Numbers)

2. The [HCF x LCM] for the numbers 50 and 20 is
10
100
1000
50

3. Which of the following number has terminating decimal expansion?
37/45
21/ 235 6
17/49
89/2232

4. Euclid’s division lemma states that for two positive integers a asbd b. there exist unique integers q and r such that a = bq+r, where r must satisfy?
1 < r < b
0 < r <=b
0 <=r < b
0 < r < b

5. The decimal expansion of the number 31/ 22.5 will terminate after
One Decimal Place
Two Decimal Place
Three Decimal Place
More than 3 Decimal Place

7. If p, q are two co – prime numbers.HCM (p, q) is:
p
q
pq
1

8. The decimal expansion of the rational number 23/22.5 will terminate after
One Decimal Place
Two Decimal Place
Three Decimal Place
More than 3 Decimal Place

9. n 2 - 1 is divisible by 8, if n is
1
p
q
pq

10. If p, q are two prime number, then LCM (p, q) is:
1
p
q
pq