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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 :

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 :

A certain number of men can finish a piece of work in 100 days. If however, there were 10 men less, it would take 10 days more for the work to be finished. How many men were originally there ?


Answer :

90
100
110
120


Question :

If 20 men working together can finish a job in 20 days, then the number of days taken by 25 men of the same capacity to finish the job are


Answer :

25
40
15
16


Question :

A train is running at a speed of 90 km/hr, crosses a pole in 10 seconds. The length of the train is


Answer :

200m
250m
300m
320m


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 :

A certain number of men could do a piece of work in 60 days. If there were eight more men, it could be finished in 10 days less. The number of men in the beginning were


Answer :

35
40
45
50


Question :

The cost price of articles and number of articles are said to be in


Answer :

direct variation
inverse 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 :

If two quantities are related in such a way that increase in one causes corresponding decrease in the other, then such a variation is called


Answer :

direct variation
inverse variation
variation
none of these


Question :

If 12 m of a uniform iron rod weights 42 kg, what will be the weight of 6 m of the same rod?


Answer :

20 kg
21 kg
84 kg
42 kg