Practicing Class 8 Maths MCQ and Class 8 Maths Chapter 7 Proportional Reasoning 1 MCQ Questions Online Test with Answers daily helps in time management.
MCQ on Proportional Reasoning 1 Class 8
Proportional Reasoning 1 MCQ Class 8
Class 8 Maths MCQ Chapter 7 Proportional Reasoning 1
Multiple Choice Questions
Question 1.
The ratio equivalent to 20:12 is
(a) 80 : 60
(b) 60 : 48
(c) 10 : 8
(d) 15 : 9
Answer:
(d) 15 : 9
Question 2.
In a group of 64 students, 42 are boys. The ratio of the number of boys and girls in that group is
(a) 32: 21
(b) 21 : 11
(c) 11 : 21
(d) 32 : 11
Answer:
(b) 21 : 11
Question 3.
Which of the following set of four numbers is not in proportion?
(a) 3,5,12,20
(b) 5,8,10,16
(c) 12,3,24,6
(d) 12,15,10,16
Answer:
(d) 12,15,10,16
Question 4.
If 48 : 40 = 30: x, then x =
(a) 64
(b) 36
(c) 25
(d) 12
Answer:
(c) 25
Question 5.
There are ‘b’ boys and ‘g’ girls in a class. The ratio of the number of boys to the total number of students in the class is:
(a) \(\frac{b}{b+g}\)
(b) \(\frac{g}{b+g}\)
(c) \(\frac{b}{g}\)
(d) \(\frac{b+g}{b}\)
Answer:
(a) \(\frac{b}{b+g}\)
Assertion-Reason Based Questions
In the following questions (6-7), a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option as:
(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
(c) Assertion is true but Reason is false.
(d) Assertion is false but Reason is true.
Question 1.
Assertion (A): In a ratio 4: 7,4 is called second term and 7 is called first term respectively.
Reason (R): In a ratio of two numbers or quantities a and b, a is called the first term and b is called the second term.
Answer:
(d) Assertion is false but Reason is true.
Question 2.
Assertion (A): If 44: 36:: x: 9, then the value of x is 14.
Reason (R): The four terms a, b, c and d are in proportion if the product of the extreme terms and the product of the middle terms are same.
Answer:
(d) Assertion is false but Reason is true.
Fill in the blanks:
1. The ratio 120: 360 in its simplest form is written as _____.
Answer: 1 : 3
2. In the ratio a: b, b is called the _____.
Answer: second term
3. A proportion is an equation in which two ratios are set ______ to each other.
Answer: equal
4. If a: b:: c: d, then a and d are called ______.
Answer: first and fourth terms
5. If 18: x:: 3: 7, then x is equal to ______ :
Answer: 42
Do as Directed
Question 1.
Find the ratio of the shaded portion to the unshaded portion.
Answer: 1 : 2
Question 2.
An office opens at 9 a.m. and closes at 5.30 p.m. with a lunch break of 30 minutes. What is the ratio of the lunch break to the total period in the office?
Answer: 1 : 17
Question 3.
The temperature has increased by 5° C in the last 30 days. If the rate of the temperature increase remains the same, how many degrees will the temperature increase by in the next twelve days?
Answer: 2° C
Question 4.
Unequal masses will not balance on a fulcrum if they are at equal distance from it; one side will go up and the other side will go down. Unequal masses will balance when the following proportion is true: \(\frac{\text { mass } 1}{\text { length } 2}\) = \(\frac{\text { mass } 2}{\text { length } 1}\)
Two children can be balanced on a seesaw when
\(\frac{\text { mass } 1}{\text { length } 2}\) = \(\frac{\text { mass } 2}{\text { length } 1}\)
The child on the left and the child on the right are balanced.
What is the mass of the child on the right?
Answer:
36 kg