CBSE  /  Class 8  /  Maths  /  Direct and Inverse Proportions

  • 1. 
    The constant of variation, if x ∝ y, from the following table is
    MCQ Questions for Class 8 Maths Chapter 13 Direct and Inverse Proportions with Answers

  • 1
  • 2
  • 3
  • 4

  • 2. 
    If x = 20 and y = 40, then x and y are:

  • Directly proportional
  • Inversely proportional
  • Neither directly nor inversely proportional
  • Cannot be determined

  • 3. 
    If x = 15 and y = 1/30, then x and y are:

  • Directly proportional
  • Inversely proportional
  • Neither directly nor inversely proportional
  • Cannot be determined

  • 4. 
    If x and y are directly proportional, then which of the following is correct?

  • x + y = constant
  • x - y = constant
  • xy = constant
  • x/y = constant

  • 5. 
    If x and y are inversely proportional, then:

  • x + y = constant
  • x - y = constant
  • xy = constant
  • x/y = constant

  • 6. 
    If x ∝ y and x1= 5, y1 = 210 and x2 = 2, then find y2?

  • 200
  • 84
  • 99
  • 70

  • 7. 
    If the weight of 12 sheets of thick paper is 40 grams, how many sheets of the same paper would weigh 2500 grams?

  • 750
  • 800
  • 850
  • 950

  • 8. 
    The scale of a map is given as 1 : 300. Two cities are 4 km apart on the map. The actual distance between them is:

  • 1000 km
  • 1100 km
  • 1200 km
  • 1300 km

  • 9. 
    If x and y are inversely proportional, then which one is true?

  • x1/y1 = x2/y2
  • x1/x2 = y1/y2
  • x1/x2 = y2/y1
  • x1.x2 = y1.y2

  • 10. 
    6 pipes are required to fill a tank in 1 hour 20 minutes. If we use 5 such types of pipes, how much time it will take to fill the tank?

  • 120 minutes
  • 96 minutes
  • 80 minutes
  • 85 minutes
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