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CBSE
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MCQ Questions for CBSE Class 12 with Answers
MCQ Questions for CBSE Class 11 with Answers
MCQ Questions for CBSE Class 10 with Answers
MCQ Questions for CBSE Class 9 with Answers
MCQ Questions for CBSE Class 8 with Answers
MCQ Questions for CBSE Class 7 with Answers
MCQ Questions for CBSE Class 6 with Answers
MCQ Questions for CBSE Class 5 with Answers
MCQ Questions for CBSE Class 4 with Answers
MCQ Questions for CBSE Class 3 with Answers
MCQ Questions for CBSE Class 2 with Answers
MCQ Questions for CBSE Class 1 with Answers
Quiz
CBSE
/
Class 8
/
Maths
/
Direct and Inverse Proportions
1.
The constant of variation, if x ∝ y, from the following table is
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 x
_{1}
= 5, y
_{1}
= 210 and x
_{2}
= 2, then find y
_{2}
?
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?
x
_{1}
/y
_{1}
= x
_{2}
/y
_{2}
x
_{1}
/x
_{2}
= y
_{1}
/y
_{2}
x
_{1}
/x
_{2}
= y
_{2}
/y
_{1}
x
_{1}
.x
_{2}
= y
_{1}
.y
_{2}
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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Direct and Inverse Proportions
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