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Chapter assessment
A. Choose the correct option.

1. The ratio equivalent to 20 : 12 is
( a) 80 : 60 (b) 60 : 48 (c) 10 : 8 (d) 15 : 9

2. In a group of 64 students, 42 are boys. The ratio of the number of boys and girls in that group is
( a) 32 : 21 (b) 21 : 11 (c) 11 : 21 (d) 32 : 11
3. Which of the following set of four numbers is not in proportion?
( a) 3, 5, 12, 20 (b) 5, 8, 10, 16 (c) 12, 3, 24, 6 (d) 12, 15, 10, 16

4. If 48 : 40 = 30 : x, then x =
( a) 64 (b) 36 (c) 25 (d) 12
5. There are ‘b’ boys and ‘g’ girls in a class. The ratio of the number of boys to the total number of
students in the class is:
b g b bg
+
( a) ( b) ( c) ( d)
+
bg bg g b
+
B. Assertion and Reason Type Questions.
In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R).
Choose the correct option as:
( a) Both Assertion (A) and Reason (R) are true, and the Reason (R) is the correct explanation of the
Assertion (A).
( b) Both Assertion (A) and Reason (R) are true, but the Reason (R) is not the correct explanation of
the Assertion (A).
( c) Assertion (A) is true but Reason (R) is false.

( d) Assertion (A) is false but Reason (R) is true.
1. Assertion (A): In a ratio 4: 7, 4 is called consequent and 7 is called antecedent respectively.
Reason (R): In a ratio of two numbers or quantities a and b, a is called the antecedent and b is
called the consequent.

2. Assertion (A): If 44 : 36 : : x : 9, then the value of x is 14.
Reason (R): The four terms a, b, c and d are in proportion if the product of the extreme terms and
the product of the middle terms are same.
C. Match the Following.

Column A Column B

(a) 4 mm to 6 cm (i) 3 : 4
(b) 4200 sec to 1 hr (ii) 10 : 12
(c) Simplified form of 105 : 140 (iii) 4 : 1
(d) Equivalent ratio for 40 : 48 is (iv) 1 : 15

1
(e) 1 hour to 20 min (v) 7 : 6
3

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