Chain Rule MCQ Set 2

Showing question 6 to 10 of total 30 MCQs

Solve the question on your notebook and check it by clicking (Answer and Explanation) below question.

Question No: 6

A flagstaff 17.5 metre high casts a shadow of length 40.25 metre. The height of building, which casts a shadow of length 28.75 metre under similar conditions will be :

1. 12 metre
2. 12.5 metre
3. 13.5 metre
4. 14 metre

Answer: B

Explanation

Less shadow, Less Height (Direct Proportion)

So, let height of building be x metre

then,

So height of building should be 12.5 metre

Question No: 7

36 men can complete a piece of work in 18 days. In how many days will 27 men complete the same work ?

1. 24 days
2. 28 days
3. 34 days
4. 35 days

Answer: A

Explanation

Less Men, means more Days {Indirect Proportion}

Let the number of days be x

then,

27 : 36 :: 18 : x

[Please pay attention, we have written 27 : 36 rather than 36 : 27, in indirect proportion, if you get it then chain rule is clear to you :)]

So 24 days will be required to get work done by 27 men.

Question No: 8

In a camp, there is a meal for 120 men or 200 children. If 150 children have taken the meal, how many men will be catered to with the remaining meal ?

1. 38 men
2. 32 men
3. 34 men
4. 30 men

Question No: 9

4 mat-weavers can weave 4 mats in 4 days. At the same rate, how many mats would be woven by 8 mat weavers in 8 days ?

1. 12
2. 14
3. 16
4. 18

Answer: C

Explanation

Please always remember, that what exactly we need to calculate before applying chain formula.

As in this question we need to find how many mats, RIGHT !

So we will compare everything with "number of mats"

As,

More men, More number of mats (Direct Proportion)

More days, More number of mats (Direct Proportion)

So, it can be solved as,

Question No: 10

In a dairy farm, 40 cows eat 40 bags of husk in 40 days. In how many days one cow will eat one bag of husk ?

1. 34 days
2. 40 days
3. 46 days
4. 50 days

Answer: B

Explanation

Less Cows, More days (Indirect Proportion)

Less bags, Less days (Direct Proportion)