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CBSE Notes 2011-2012 » Direct and Inverse Proportions - Class 8 Maths MCQs (Free Practice Test)

Direct and Inverse Proportions - Class 8 Maths MCQs (Free Practice Test)


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Question :

14 pumps of equal capacity can fill a tank in 6 days. If the tank has to be filled in 4 days, then the number of extra pumps needed, are


Answer :

21
7
24
28


Question :

If two quantities x and y are related to each other in such a way that xy is a constant, then x and y are said to be in


Answer :

inverse variation
direct variation
variation
none of these


Question :

If the value of two quantities are related in such a way that a change in one result is a corresponding change in the other, then two quantities are said to be in


Answer :

direct variation
inverse variation
variation
none of these


Question :

If ten pipes through which water flows at the same rate can fill a tank in 28 minutes. If three pipes go out of order, how long will the remaining pipes take to fill the tank ?


Answer :

40 minutes
40 minutes
56 minutes
42 minutes


Question :

The cost price of 4 kg of sugar is Rs. 60. What will be the cost price of 20 kg of sugar ?


Answer :

Rs. 200
Rs. 300
Rs. 400
Rs. 450


Question :

x and y are in direct variation. I f y = 10 when x - 5, then value of y when x = 10, is


Answer :

2
5
10
20


Question :

If two quantities x and y are related to each other in such a way that x/y remains a positive constant, then x and y are said to be in


Answer :

inverse variation
direct variation
variation
none of these


Question :

5 bags of wheat weigh 200 kg. How many such bags of wheat will weigh 800 kg ?


Answer :

40
20
15
10


Question :

A train 150 m long, is running at a speed of 90 km/hr. Then time taken by the train to cross a tree is


Answer :

3 sec
4 sec
5 sec
6 sec


Question :

If a train 120 m long crosses a man in 15 seconds. Then the speed of the train is


Answer :

6 m/s
7 m/s
8 m/s
9 m/s