Page 134 - Maths Skills - 8

Direct and Inverse Propor
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1 1 9 9 Direct and Inverse Propor
Large Numbersarge Numberstionstions

Learning Outcomes

In this chapter, you will learn about:
� Types of proportions � Inverse proportion � Pipes and cisterns � Problems based on trains
� Direct proportion � Time and work � Time and distance

Boot-Up (To Recapitulate Previous Knowledge of Concepts)

COMPETENCY BASED QUESTIONS

A. Multiple-Choice Questions
1. a % of y is:
ay a y
(i) (ii) (iii) (iv) 100
100 100 100 ay
2. Per cent means a fraction with denominator:
(i) 1 (ii) 100 (iii) 1000 (iv) 10
3. If 25% of x is 500, then x is:
(i) 5000 (ii) 200 (iii) 2000 (iv) 20,000
4. If 12.5% of q is 19, the value of q is:
(i) 125 (ii) 152 (iii) 1520 (iv) 1250

5. 125% converted to decimals is:
(i) 1.25 (ii) 12.5 (iii) 0.125 (iv) 1250

B. Fill in the Blanks
1. In the proportion 3 : x = 6 : 12, the value of x is _____________.
2. A car travels 240 km in 4 hours. The speed of the car is a ______ : _______ ratio with time.
3. A map has a scale of ______________ km. If the distance between two towns on the map is 3 cm,
1 cm:
the actual distance between the towns is _____________ km.
4. Doubling the number of apples in a basket will _________ (increase/decrease) the weight of the basket.

C. Write ‘T’ for true and ‘F’ for false Statements

1. Raju can walk 6 km in an hour, he can walk 10 km in 100 minutes
2. Twenty four apples can be packed in 4 cartons. Then 74 apples can be packed in 12 cartoons.
1 Time
3. 1 second = hour. 4. Distance =
3565 Speed

5
5. 1 km/h = m/sec 6. 25 m/s = 125 km/h
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