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Comparing Quantities Practice Questions

Class 8 · Mathematics · 869 free MCQs with instant results and detailed explanations.

869
Total
257
Easy
450
Medium
162
Hard

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Topics in Comparing Quantities

Compound Interest 233
Ratios 153
Discount and Tax 248
Percentages 235

Sample Questions from Comparing Quantities

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Q1
Easy
In a fruit basket, the ratio of apples to oranges is 2:5. If there are 20 oranges, how many apples are there?
A. 8
B. 10
C. 12
D. 4
Show Answer & Explanation
Correct Answer: A
The ratio 2:5 indicates that for every 2 apples, there are 5 oranges. Knowing there are 20 oranges allows us to find the number of apples.
Q2
Easy
A recipe calls for sugar and flour in a ratio of 1:3. If you use 300 grams of flour, how much sugar do you need?
A. 100 grams
B. 75 grams
C. 50 grams
D. 200 grams
Show Answer & Explanation
Correct Answer: A
The ratio 1:3 means for every 1 part sugar, there are 3 parts flour. Using 300 grams of flour, we can calculate the sugar needed.
Q3
Easy
If the ratio of cats to dogs in a pet shop is 5:3, what fraction of the pets are cats?
A. 5/8
B. 3/5
C. 5/3
D. 3/8
Show Answer & Explanation
Correct Answer: A
The total parts in the ratio are 5 + 3 = 8. The fraction of cats is the number of cats divided by the total number of pets.
Q4
Medium
A recipe requires a ratio of flour to sugar as 5:2. If you have 10 cups of flour, how much sugar is needed?
A. 4 cups
B. 5 cups
C. 6 cups
D. 2 cups
Show Answer & Explanation
Correct Answer: A
To maintain the ratio of 5:2 with 10 cups of flour, calculate sugar as follows: (2/5) * 10 = 4 cups.
Q5
Medium
Two numbers are in the ratio 7:9. What is the percentage increase if the first number becomes 63?
A. 20%
B. 30%
C. 10%
D. 15%
Show Answer & Explanation
Correct Answer: C
If the first number's initial value is x, then 9/7 * x = 63 implies x = 49. The increase is (63-49)/49 * 100% = 28.57% or approximately 30%.
Q6
Medium
A car travels a distance of 120 km in 2 hours. What is the ratio of distance to time?
A. 60 km/h
B. 120:2
C. 30:1
D. 60:1
Show Answer & Explanation
Correct Answer: B
Distance to time gives the ratio 120 km:2 hours, which simplifies to 60:1 when divided.
Q7
Medium
The ratio of boys to girls in a sports team is 2:3. If there are 15 boys, how many girls are in the team?
A. 22
B. 30
C. 18
D. 25
Show Answer & Explanation
Correct Answer: B
With 2 parts representing boys and 3 parts for girls, if 2 parts = 15 boys, then 1 part = 7.5, leading to 3 parts (girls) = 22.5.
Q8
Hard
A recipe requires a ratio of flour to sugar of 4:1. If you have 12 cups of flour, how much sugar do you need?
A. 3 cups
B. 4 cups
C. 6 cups
D. 2 cups
Show Answer & Explanation
Correct Answer: A
To find the amount of sugar, divide the amount of flour by 4.
Q9
Hard
In a class of 40 students, the ratio of boys to girls is 3:2. How many girls are in the class?
A. 16 girls
B. 24 girls
C. 20 girls
D. 12 girls
Show Answer & Explanation
Correct Answer: A
The total parts of the ratio is 3 + 2 = 5. Each part represents 8 students (40/5). Therefore, there are 2 parts for girls: 2 * 8 = 16.
Q10
Hard
If the ratio of the ages of two siblings is 5:3 and the sum of their ages is 64 years. What is the age of the elder sibling?
A. 40 years
B. 32 years
C. 36 years
D. 30 years
Show Answer & Explanation
Correct Answer: A
Let the ages be 5x and 3x. The equation is 5x + 3x = 64. Solving gives x = 8, so the elder sibling is 5x = 40 years.

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Comparing Quantities — Class 8 Mathematics Practice Questions Online

This page contains 869 practice MCQs for the chapter Comparing Quantities in Class 8 Mathematics. The questions are organized by difficulty — 257 easy, 450 medium, 162 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 4 topics, giving you comprehensive coverage of the entire chapter.