We have compiled the NCERT MCQ Questions for Class 8 Maths Chapter 13 Direct and Indirect Proportions with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 8 Maths with Answers on a daily basis and score well in exams. Refer to the Direct and Indirect Proportions Class 8 MCQs Questions with Answers here along with a detailed explanation.

## Direct and Indirect Proportions Class 8 MCQs Questions with Answers

Choose the correct option.

Question 1.

If x varies inversely to y and x = 4 when y = 6. The value of y when x = 2 is …………..

(a) 6

(b) 4

(c) 412

(d) 8

## Answer

Answer: (d) 8

Question 2.

5 persons complete 10 jobs in 20 minutes. How many minutes will 30 persons take to complete 30 similar jobs?

(a) 40

(b) 180

(c) 10

(d) 360

## Answer

Answer: (c) 10

Question 3.

A boy runs 1 km in 5 minutes. How long will he take to run 600 m?

(a) 2 minutes

(b) 3 minutes

(c) 4 minutes

(d) 6 minutes

## Answer

Answer: (c) 4 minutes

Question 4.

8 gram of sandalwood cost Rs 400. What will 54 gram sandalwood cost?

(a) Rs 200

(b) Rs 100

(c) Rs 2000

(d) Rs 800

## Answer

Answer: (c) Rs 2000

Question 5.

If 3 quintals of coal cost Rs 6000, What is the cost of 120 kg?

(a) Rs 1200

(b) Rs 2400

(c) Rs 3600

(d) Rs 4800

## Answer

Answer: (b) Rs 2400

Question 6.

If 8 men can do a piece of work in 20 days, in how many days could 20 men do the same work?

(a) 4 days

(b) 6 days

(c) 8 days

(d) 10 days

## Answer

Answer: (c) 8 days

Question 7.

If ‘A’ can finish a work in ‘n’ days then part of work finished in one day is

(a) 1 – n

(b) \(\frac {1}{n}\)

(c) n – 1

(d) none of these

## Answer

Answer: (b) \(\frac {1}{n}\)

Question 8.

If x and y vary inversely. Then using the following table, find x if y = 10.

x = 15

y = 90

(a) 100

(b) 135

(c) 400

(d) 200

## Answer

Answer: (b) 135

Question 9.

If x and y vary inversely with respect of each other such that x = 15 when y = 6. Find the value of x when y = 15.

(a) 2

(b) 4

(c) 5

(d) 6

## Answer

Answer: (d) 6

Question 10.

If ‘x’ and ‘y’ are in a direct propostion then which of the following is correct?

(a) x – y = constant

(b) x + y = constant

(c) x × y = constant

(d) \(\frac {x}{y}\) = Constant

## Answer

Answer: (d) \(\frac {x}{y}\) = Constant

Question 11.

1f ‘x’ and ‘y’ are in an inverse variation then which of the following is correct?

(a) x – y constant

(b) x +y = constant

(c) xy = constant

(d) \(\frac {x}{y}\) = constante

## Answer

Answer: (c) xy = constant

Fill in the blanks

Question 1.

If ‘x’ and ‘y’ vary directly then ………………….. is constant.

## Answer

Answer: \(\frac {x}{4}\)

Question 2.

Distance covered is ………………… proportional to speed.

## Answer

Answer: Directly

Question 3.

If the number of books is tripled, then their cost increases ……………….. times.

## Answer

Answer: triples

Question 4.

If 4 : x :: x : 9 then x is ………………..

## Answer

Answer: 6

Question 5.

A train 150 m long is going at 45 km/h. The time taken by the train to cross a 500 m long platform is ………………….

## Answer

Answer: 52 seconds

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