RS Aggarwal 2021-2022 for Class 6 Maths Chapter 1 - Number System
EXERCISE 1H
OBJECTIVE QUESTIONS
Mark (✓) against the correct answer in each of the following:
1. The place value of 6 in the numeral 48632950 is
(a) 6 (b) 632950 (c) 60000 (d) 486
Solution:- Option (c) is correct.
Place value of 6 = 6 lakhs = (6 × 100000) = 600000
2. The face value of 4 in the numeral 89247605 is
(a) 4 (b) 400000 (c) 47605 (d) 8924
Solution:- Option (a) is correct
3. The difference between the place value and the face value of 5 in the numeral 78653421 is
(a) 53416 (b) 4995 (c) 49995 (d) none of these
Solution:- Option (c) is correct.
Place value of 5 = 50000
Face value of 5 = 5
∴ Required difference = 50000 − 5 = 49995
4. The smallest counting number is
(a) 0 (b) 1 (c) 10 (d) none of these
Solution:- Option (b) is correct.
The smallest counting number is 1.
5. How many 4-digit numbers are there?
(a) 8999 (b) 9000 (c) 8000 (d) none of these
Solution:- Option (b) is correct.
The largest 4-digit number = 9999
The smallest 4-digit number = 1000
Total number of all 4-digit numbers = (9999 − 1000) + 1
= 8999 + 1 = 9000
6. How many 7-digit numbers are there?
(a) 8999999 (b) 9000000 (c) 1000000 (d) none of these
Solution:- Option (b) is correct.
The largest 7-digit number = 9999999
The smallest 7-digit number = 1000000
Total number of 7-digit numbers = (9999999 − 1000000) + 1
= 8999999 + 1
= 9000000
7. How many 8-digit numbers are there?
(a) 99999999 (b) 89999999 (c)90000000 (d) none of these
Solution:- Option (c) is correct.
The largest 8-digit number = 99999999
The smallest 8-digit number = 10000000
Total number of 8-digit numbers = (99999999 − 10000000) + 1
= 89999999 + 1
= 90000000
8. What comes just before 1000000?
(a) 99999 (b) 999999 (c) 9999999 (d) none of these
Solution:- Option (b) is correct.
The number just before 1000000 is 999999 (i.e., 1000000 − 1).
9. Which of the following is not meaningful?
(a) VX (b) XV (c) XXV (d) XXXV
Solution:- Option (a) is correct.
V, L and D are never subtracted. Thus, VX is wrong.
10. Which of the following is not meaningful?
(a) CI (b) CI (c) IC (d) XC
Solution:- Option (c) is correct.
I can be subtracted from V and X only. Thus, IC is wrong.
11. Which of the following is not meaningful?
(a) XIV (b) XVV (c) XII (d) XXII
Solution:- Option (b) is correct.
V, L and D are never repeated. Thus, XVV is meaningless.
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