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Class 8 Maths Chapter 13 Direct And Inverse Proportions Quiz 5 (25 MCQs)

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1. Y varies directly as x. If y = 12 when x = 15, what is y when x = 20?
2. If a principal amount of Rs 2, 000 is deposited in a bank then the bank gives Rs 500 as simple interest in 3 years. What should be the principal amount to earn Rs 5600 as simple interest in 3 years with the same rate of simple interest?
3. Which of the following vary inversely with each other?
4. Which statement best describes an inverse proportion relationship between y and x?
5. Given that y varies inversely with x, if x =7 and y = 4, what is y when x = 2?
6. Is this a direct proportion?y=2x
7. The length of a cloth and its cost relates to
8. Assuming land to be uniformly fertile, the area of land and the yield on it vary:
9. A loaded truck travels 14 km in 25 minutes. If the speed remains the same, how far can it travel in 5 hours?
10. A machine in a soft drink factory fills 840 bottles in six hours. How many bottles will it fill in five hours?
11. The weight of a liquid varies directly as its volume V. If the weight of the liquid in a cubical container 5 cm on a side is 250 g, find the weight of the liquid in a cubical container 3 cm on a side.
12. The number of kilograms of water in a person's body varies directly as the person's mass. A person with a mass of 90 kg contains 60 kg of water. How many kilograms of water are in a person whose mass is 75 kg?
13. If x and y vary inversely and x = 15 when y = 6, find y when x = 9.
14. The width of a rectangle varies inversely with its length. if the width is 4 when the length is 18, find the width when the length is 8.
15. T is directly proportional to n$^{2}$.Given t=144 when n=6. Find the equation for t and n.
16. A 5 m 60 cm high vertical pole casts a shadow 3 m 20 cm long. Find at the same time the length of the shadow cast by another pole 10 m 50 cm high.
17. In an inverse proportion, what happens to one quantity as the other quantity increases?
18. In the equation y = 14x, what is the constant of proportionality?
19. Identify whether the given relation is Direct or Indirect Proportion?Area of farmland and the crops harvested.
20. Both p and q vary inversely with each other. When p is 5/4, then q is 24/15. If p is 14/5, what will be the value of q?
21. A person's weekly pay is directly proportional to the number of hours worked. Shawn's pay is $ 123.00 for 20 hours of work. What is the constant of variation?
22. Y varies directly as x, if y=12 when x=5, find y when x=3
23. If it takes 3 mechanics, 20 hours to build a car, how long will it take 4 mechanics?
24. A garrison of 500 men has provisions for 24 days. However, a reinforcement of 300 men arrived. The food will now last for
25. If the weight of 12 sheets of thick paper is 40 grams, how many sheets ofthe same paper would weigh 3 1/2 kilograms?
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