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Class 8 Maths Chapter 13 Direct And Inverse Proportions Quiz 3 (25 MCQs)

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1. Meenakshi cycles to her school at an average speed of 12 km/h and takes 20 minutes to reach her school. If she wants to reach her school in 12 minutes, her average speed should be
2. The number of mistakes is ..... proportional to practice
3. Rashmi has a road map with a scale of 1 cm representing 18 km. She drives on a road for 72 km. What would be her distance covered in the map?
4. 1 Both u and v vary directly with each other. When u is 10, v is 15, which of the following is not a possible pair of corresponding values of u and v?
5. 20 trucks can hold 150 metric tonnes. How much will 12 trucks hold?
6. A farmer has enough food to feed 20 animals in his cattle for 6 days. How long would the food last if there were 10 more animals in his cattle?
7. There are 150 students in a hostel. Food provision for them is for 20days. How long will these provisions last, if 25 students left the group?
8. If 18 drinks cost Ā£54, how much will 7 drinks cost?
9. Does the equation show an inverse variation? y=10/x
10. Quantity of petrol and its cost relates to
11. 7 men can complete a work in 52 days. In how many days will 13 men finish the same work?
12. In a direct proportion, what happens to one quantity as the other quantity increases?
13. The time it takes to travel a fixed distance varies inversely with the speed traveled. If it takes Pancho 52 minutes to bike to his fishing spot at 9.5 miles per hour, how long will it take him if he rides at 11 miles per hour?
14. G is directly proportional to bGiven g=20 when b=4.Find g when b=7
15. What is the constant (k) in this inverse variation?y = 400/x
16. Multiply 210125 by the smallest number so that the product is a perfect cube.
17. Both a and b vary directly with each other. When a is 10, b is 4. What will be the value of b when a is 15?
18. The battery power and the time it is used for relates to
19. What kind of equation is this?xy = 18
20. On a map, 180 miles are represented by 4 inches. How many miles are represented by 6 inches?
21. The distance that an automobile travels varies directly as the time it travels. If the car travels 280 miles in 7 hours, how far will it travel in 12 hours?
22. A factory requires 42 machines to produce a given number of articles in 63 days. How many machines would be required to produce the same number of articles in 54 days?
23. An electric pole, 14 metres high, casts a shadow of 10 metres. Find the height of a tree that casts a shadow of 15 metres under similar conditions.
24. A car travels 420 miles in 8 hours. If the car continues at the same rate, how far will it travel in 12 hours?
25. In which of the following case two quantities can be in direct proportion?
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