Chain Rule MCQ Set 1

Showing question 1 to 5 of total 30 MCQs

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

Question No: 1

If 16 toys cost 240, then what do 40 toys cost ?

1. Rs. 600
2. Rs. 620
3. Rs. 640
4. Rs. 660

Answer: C

Explanation

Although we can first calculate the cost of one toy and then can multiply it with 40 to get the result.

but we will solve it with chain rule so that we can prepare ourself for other complex problems which we can solve

easily by applying this rule.

Let the required cost be Rs. x

More toys means More Cost. (Direct Proportion)

So 40 toys will cost Rs 640

Question No: 2

If the cost of x meters of wire is d rupees, then what is the cost of y meters of wire at the same rate ?

1. xd
2. yd
3. yd/x
4. x/yd

Question No: 3

If the price of 23 toys is 276, then what will the price of 12 toys ?

1. 144
2. 148
3. 156
4. 186

Answer: A

Explanation

Less toys, Less Price (Direct Proportion)

So, let the price be Rs. x

then,

So price of 12 toys will be Rs. 144

Question No: 4

If a quarter kg of potato costs 60 paise, how many paise will 200gm cost ?

1. 45 paise
2. 46 paise
3. 47 paise
4. 48 paise

Answer: D

Explanation

Quarter of Kg means 250 gm

Less weight, less price (Direct Proportion)

So,

So 200 gm will cost 48 paise.

Question No: 5

An industrial loom weaves 0.128 metres of cloth every second. Approximately, how many seconds will it take for the loom to weave 25 metre of cloth ?

1. 194 seconds
2. 195 seconds
3. 196 seconds
4. 197 seconds

Answer: B

Explanation

Let the time required by x seconds.

Then, More cloth means More time (Direct Proportion)

So,

So time will be approx 195 seconds