RS Aggarwal Solutions: Number System (Exercise 1H) | Mathematics (Maths) Class 6 PDF Download

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Objective questions
Mark (✔) against the correct answer in each of the following
Q.1.The place value of 6 in the numeral 48632950 is

(a) 6
(b) 632950
(c) 600000
(d) 486
Ans. (c) Place value of 6 in 48632950 is 600000

Q.2. The face value of 4 in the numeral 89247605 is
(a) 4
(b) 40000
(c) 47605
(d) 8924
Ans. (a) Face value of 4 in the numeral
89247605 is 4
(∴ Face value does not alter)

Q.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
Ans.
(c) The place of 5 in the numeral

78653421 is 50000 and face value is 5

∴ Difference between 50000 and 5 = 49995

Q.4. The smallest counting number is
(a) 0
(b) 1
(c) 10
(d) none of these
Ans. (b) The smallest counting number is 1

Q.5. How many 4-digit numbers are there ?
(a) 8999
(b) 9000
(c) 8000
(d) none of these
Ans.
(b) 4-digit numbers are 1000 to 9999
⇒ 9999 – 999 = 9000

Q.6. How many 7-digit numbers are there ?
(a) 8999999
(b) 9000000
(c) 1000000

(d) none of these
Ans.
(b) 7-digit numbers are from 1000000 to 9999999 or 9999999 – 999999
= 9000000

Q.7. How many 8-digit numbers are there ?
(a) 99999999
(b) 89999999
(c) 90000000
(d) none of these
Ans.
(c) 8-digit numbers are to 99999999
99999999 – 9999999 = 90000000

Q.8. What comes just before 1000000 ?
(a) 99999
(b) 999999
(c) 9999999
(d) none of these
Ans.
The number before 1000000 will be
1000000 – 1 = 999999

Q.9. Which of the following is not meaningful?
(a) VX
(b) XV
(c) XXV
(d) XXXV

Ans.
(a) VX is not meaningful as V does not come before X

Q.10. Which of the following is not meaningful?
(a) CI
(b) CII
(c) IC
(d) XC
Ans.
(c) IC is not meaningful as I comes before

V and X only

Q.11. Which of the following is not meaningful?
(a) XIV
(b) XVV
(c) XIII
(d) XXII
Ans. (b) XVV is not meaningful as V does not

comes more than once.