# MCQ Questions for Class 8 Maths Chapter 13 Direct and Indirect Proportions with Answers

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## 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

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

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

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

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

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

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: (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

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

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: (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

Fill in the blanks

Question 1.
If ‘x’ and ‘y’ vary directly then ………………….. is constant.

Answer: $$\frac {x}{4}$$

Question 2.
Distance covered is ………………… proportional to speed.

Question 3.
If the number of books is tripled, then their cost increases ……………….. times.

Question 4.
If 4 : x :: x : 9 then x is ………………..