NCERT Exemplar Solutions
Class 6 - Mathematics - Unit 1: Number SystemMultiple Choice Questions
Class 6 - Mathematics - Unit 1: Number System
Question. 1
The product of the place values of two 2’s in 428721 is
4
40000
400000
40000000
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Question. 2
\(3\times10000+7\times1000+9\times100+0\times10+4\) equals
3794
37940
37904
379409
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Question. 3
If 1 is added to the greatest 7-digit number, it equals
10 thousand
1 lakh
10 lakh
1 crore
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Question. 4
The expanded form of 9578 is
\(9\times10000+5\times1000+7\times10+8\times1\)
\(9\times1000+5\times100+7\times10+8\times1\)
\(9\times1000+57\times10+8\times1\)
\(9\times100+5\times100+7\times10+8\times1\)
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Question. 5
When rounded off to nearest thousands, 85642 is
85600
85700
85000
86000
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Question. 6
The largest 4-digit number using any one digit twice from 5, 9, 2, 6 is
9652
9562
9659
9965
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Question. 7
In Indian System of Numeration, 58695376 is written as
58,69, 53, 76
58,695,376
5,86,95,376
586,95,376
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Question. 8
One million is equal to
1 lakh
10 lakh
1 crore
10 crore
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Question. 9
The greatest number which on rounding off to nearest thousands gives 5000 is
5001
5559
5999
5499
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Question. 10
Keeping the place of 6 fixed in 6350947, the smallest number by rearranging other digits is
6975430
6043579
6034579
6034759
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Question. 11
Which Roman numeral is incorrect?
LXXX
LXX
LX
LLX
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Question. 12
The largest 5-digit number having three different digits is
98978
99897
99987
98799
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Question. 13
The smallest 4-digit number having three different digits is
1102
1012
1020
1002
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Question. 14
Number of whole numbers between 38 and 68 is
31
30
29
28
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Question. 15
The product of the successor and predecessor of 999 is
999000
998000
989000
1998
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Question. 16
The product of a non-zero whole number and its successor is always
an even number
an odd number
a prime number
divisible by 3
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Question. 17
A whole number is added to 25 and the same number is subtracted from 25. The sum of the results is
0
25
50
75
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Question. 18
Which of the following is not true?
\( (7+8)+9 = 7+(8+9) \)
\( (7 imes8) imes9 = 7 imes(8 imes9) \)
\( 7 + 8 imes9 = (7+8) imes(7+9) \)
\( 7 imes(8+9) = (7 imes8)+(7 imes9) \)
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Question. 19
Using dot (·) patterns, which number can be arranged as a line, a triangle and a rectangle?
9
10
11
12
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Question. 20
Which statement is not true?
Addition and multiplication are associative for whole numbers.
Zero is the identity for multiplication of whole numbers.
Addition and multiplication are commutative for whole numbers.
Multiplication is distributive over addition.
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Question. 21
Which statement is not true?
0+0=0
0-0=0
0\times0=0
0\div0=0
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Question. 22
The predecessor of 1 lakh is
99000
99999
999999
100001
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Question. 23
The successor of 1 million is
2 millions
1000001
100001
10001
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Question. 24
Number of even numbers between 58 and 80 is
10
11
12
13
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Question. 25
Sum of the number of primes between 16–80 and 90–100 is
20
18
17
16
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Question. 26
Which statement is not true?
HCF of two distinct prime numbers is 1.
HCF of two coprime numbers is 1.
HCF of two consecutive even numbers is 2.
HCF of an even and an odd number is even.
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Question. 27
The number of distinct prime factors of the largest 4-digit number is
2
3
5
11
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Question. 28
The number of distinct prime factors of the smallest 5-digit number is
2
4
6
8
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Question. 29
If \(7254*98\) is divisible by 22, the digit \(*)\) is
1
2
6
0
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Question. 30
The largest number that always divides the sum of any pair of consecutive odd numbers is
2
4
6
8
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Question. 31
A number is divisible by 5 and 6. It may not be divisible by
10
15
30
60
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Question. 32
The sum of the prime factors of 1729 is
13
19
32
39
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Question. 33
The greatest number which always divides the product of the predecessor and successor of an odd natural number \((\neq 1)\) is
6
4
16
8
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Question. 34
The number of common prime factors of 75, 60 and 105 is
2
3
4
5
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Question. 35
Which pair is not coprime?
8, 10
11, 12
1, 3
31, 33
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Question. 36
Which of the following is divisible by 11?
1011011
1111111
22222222
3333333
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Question. 38
LCM of two numbers is 180. Which of the following is not the HCF of the numbers?
45
60
75
90