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E:\Working\Focus_Learning\Math_Genius-8\Open_Files\01_Chapter_1\Chapter_1
\ 06-Jan-2025 Bharat Arora Proof-7 Reader’s Sign _______________________ Date __________

Chapter assessment
A. Choose the correct option.

1. The standard form of 0 is ...............
1
(a) 0 (b) 1 (c) (d) Does not exist
0
2. –1.5 can be expressed as a rational number in standard form as ...............
−15 15 −3
(a) (b) –15 (c) (d)
10 10 2
3. How many rational numbers are there between 1 and 3?
(a) 1 (b) 0 (c) unlimited (d) 100

5
4. Additive inverse of 1 is
10
15 −3 10 10
(a) (b) (c) 1 (d) –1
10 2 5 5
−6
5
5. The numerical expression    7 + 14 = −  1   shows that
2
(a) rational numbers are closed under addition.
(b) rational numbers are not closed under addition.
(c) rational numbers are closed under multiplication.
(d) addition of rational numbers is not commutative.

6. Which of the following is not true?
(a) Rational numbers are closed under division.
(b) Rational numbers are closed under subtraction.
(c) Rational numbers are closed under multiplication.
(d) Non-zero rational numbers are closed under division.

7. If a be the reciprocal of rational number b, then the reciprocal of the reciprocal of b will be
a b
(a) (b) (c) a (d) b
b a
1 2
8. Karan works at Pizza Hut. In morning, he chopped 1 kg of white onions and 8 kg of red onions.
4 3
How much onions did Karan chop in all?
11 11 11 11
(a) 9 kg (b) 11 kg (c) 10 kg (d) 12 kg
12 12 12 12
−5 −9 8 −1
9. The product of × × × is
3 10 21 6
2 4 −2 −4
(a) (b) (c) (d)
21 21 21 21
3
10. The multiplicative inverse of is
10
−3 10 −10 3
(a) (b) (c) (d)
10 3 3 10

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