NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 1: Number SystemMultiple Choice Questions
Class 7 - Mathematics - Unit 1: Number System
Question. 1
When the integers 10, 0, 5, –5, –7 are arranged in descending or ascending order, then find out which of the following integers always remains in the middle of the arrangement.
0
5
–7
–5
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Question. 2
By observing the number line (Fig. 1.2), state which of the following statements is not true.
B is greater than –10
A is greater than 0
B is greater than A
B is smaller than 0
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Question. 3
By observing the above number line (Fig. 1.2), state which of the following statements is true.
B is 2
A is –4
B is –13
B is –4
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Question. 4
Next three consecutive numbers in the pattern 11, 8, 5, 2, ––, ––, –– are
0, –3, –6
–1, –5, –8
–2, –5, –8
–1, –4, –7
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Question. 5
The next number in the pattern –62, –37, –12, –– is
25
13
0
–13
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Question. 6
Which of the following statements is not true?
When two positive integers are added, we always get a positive integer.
When two negative integers are added we always get a negative integer.
When a positive integer and a negative integer is added we always get a negative integer.
Additive inverse of an integer 2 is (–2) and additive inverse of (–2) is 2.
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Question. 7
On the following number line value ‘Zero’ is shown by the point
X
Y
Z
W
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Question. 8
If ⊗, O, ⊙ and • represent some integers on the number line, then the descending order of these numbers is
•, ⊗, ⊙, O
⊗, •, ⊙, O
O, ⊙, ⊗, •
O, •, ⊗, ⊙
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Question. 9
On the number line, the value of \((-3)\times 3\) lies on right hand side of
–10
–4
0
9
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Question. 10
The value of \(5\div(-1)\) does not lie between
0 and –10
0 and 10
–4 and –15
–6 and 6
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Question. 11
Water level in a well was 20 m below ground level. During rainy season, rain water collected in different water tanks was drained into the well and the water level rises 5 m above the previous level. The wall of the well is 1 m 20 cm high and a pulley is fixed at a height of 80 cm. Raghu wants to draw water from the well. The minimum length of the rope that he can use is
17 m
18 m
96 m
97 m
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Question. 12
\((-11)\times 7\) is not equal to
\(11\times(-7)\)
\(-\,(11\times 7)\)
\((-11)\times(-7)\)
\(7\times(-11)\)
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Question. 13
\((-10)\times(-5)+(-7)\) is equal to
–57
57
–43
43
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Question. 14
Which of the following is not the additive inverse of \(a\)?
–(–a)
\(a\times(-1)\)
–a
\(a\div(-1)\)
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Question. 15
Which of the following is the multiplicative identity for an integer \(a\)?
\(a\)
1
0
–1
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Question. 16
\([(–8)\times(–3)]\times(–4)\) is not equal to
\((–8)\times[(–3)\times(–4)]\)
\([(–8)\times(–4)]\times(–3)\)
\([(–3)\times(–8)]\times(–4)\)
\((–8)\times(–3) - (–8)\times(–4)\)
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Question. 17
\((–25)\times[6+4]\) is not same as
\((–25)\times 10\)
\((–25)\times 6 + (–25)\times 4\)
\((–25)\times 6 \times 4\)
–250
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Question. 18
\(–35\times 107\) is not same as
\(–35\times(100+7)\)
\((–35)\times 7 + (–35)\times 100\)
\(–35\times 7 + 100\)
\((–30–5)\times 107\)
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Question. 19
\((–43)\times(–99)+43\) is equal to
4300
–4300
4257
–4214
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Question. 20
\((–16)\div 4\) is not same as
\((–4)\div 16\)
\(-\,(16\div 4)\)
\(16\div(–4)\)
–4
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Question. 21
Which of the following does not represent an integer?
\(0\div(–7)\)
\(20\div(–4)\)
\((–9)\div 3\)
\((–12)\div 5\)
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Question. 22
Which of the following is different from the others?
\(20+(–25)\)
\((–37)–(–32)\)
\((–5)\times(–1)\)
\((45)\div(–9)\)
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Question. 23
Which of the following shows the maximum rise in temperature?
23° to 32°
–10° to 1°
–18° to –11°
–5° to 5°
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Question. 24
If \(a\) and \(b\) are two integers, then which of the following may not be an integer?
\(a+b\)
\(a-b\)
\(a\times b\)
\(a\div b\)
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Question. 25
For a non-zero integer \(a\) which of the following is not defined?
\(a\div 0\)
\(0\div a\)
\(a\div 1\)
\(1\div a\)