Practice the multiple choice questions on ratio and proportion. The questions are related to the basic properties of ratio and proportion.
Tick (√) the correct answer:
1. A ratio equivalent to 3 : 7 is:
(i) 3 : 9; (ii) 6 : 10; (iii) 9 : 21; (iv) 18 : 49
2. The ratio 35 : 84 in simplest form is:
(i) 5 : 7; (ii) 7 : 12; (iii) 5 : 12; (iv) none of these
3. In a class there are 20 boys and 15 girls. The ratio of boys to girls is:
(i) 4 : 3; (ii) 3 : 4; (iii) 4 : 5; (iv) none of these
4. Two numbers are in the ratio 7 : 9. If the sum of the numbers is 112, then the larger number is:
(i) 49; (ii) 72; (iii) 63; (iv) 42
5. The ratio of 1.5 m to 10 cm is:
(i) 1 : 15; (ii) 15 : 10; (iii) 10 : 15; (iv) 15 : 1
6. The ratio of 1 hour to 300 seconds is:
(i) 1 : 12; (ii) 12 : 1; (iii) 1 : 5; (iv) 5 : 1
7. In 4 : 7 : : 16 : 28, 7 and 16 are called
(i) extreme terms; (ii) middle terms; (iii) b middle and c extreme term; (iv) none of these
8. The first, second and fourth terms of a proportion are 16, 24 and 54 respectively. Then the third term is:
(i) 36; (ii) 28; (iii) 48; (iv) 32
9. If 12, 21, 72, 126 are in proportion, then:
(i) 12 × 21 = 72 × 126; (ii) 12 × 72 = 21 × 126; (iii) 12 × 126 = 21 × 72; (iv) none of these
10. If x, y and z are in proportion, then:
(i) x : y : : z : x; (ii) x : y : : y : z; (iii) x : y : : z : y; (iv) x : z : : y : z
11. 7 : 12 is equivalent to:
(i) 28 : 40; (ii) 42 : 71; (iii) 72 : 42; (iv) 42 : 72
12. The length and breadth of a rectangle are in the ratio 3 : 1. If the breadth is 7 cm, then the length of the rectangle is:
(i) 14 cm; (ii) 16 cm; (iii) 18 cm; (iv) 21 cm
13. The value of m, if 3, 18, m, 42 are in proportion is:
(i) 6; (ii) 54; (iii) 7; (iv) none of these
14. Length and width of a field are in the ratio 5 : 3. If the width of the field is 42 m then its length is:
(i) 100 m; (ii) 80 m; (iii) 50 m; (iv) 70 m
Answers for the multiple choice questions on ratio and proportion are given below to check the exact option.
Answers:
1. (iii) 2. (iii) 3. (i)
4. (iii) 5. (iv) 6. (ii) 7. (ii) 
8. (i) 9. (iii)
10. (ii) 11. (iv) 12. (iv) 13. (iii) 14. (iv) 
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