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Proportional Reasoning-2 — Practice Quiz

CBSE · Class 8 · Mathematics

Try a 4-question quiz on Proportional Reasoning-2 for CBSE Class 8 Mathematics: tap an answer to check it and see why.

55 questions76 flashcards5 formulas & key relations5 concepts

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Quick Quiz: Proportional Reasoning-2

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1

A school uses the ratio 1:1.5:3 for cement, sand, and gravel. If the total concrete needed is 110 units, how many units of cement are needed?

2

A purple paint mix has Red:Blue:White = 2:3:5. If the white paint is 10 litres, how many litres of red and blue paint are needed together?

3

Ram and Shyam together cut vegetables. Ram cuts the work in 1 hour and Shyam cuts the same work in 1.5 hours. How long do they take together to finish the work?

4

Puneet's father travels from Lucknow to Kanpur in 3 hours at 30 km/h. If the speed changes to 60 km/h, how long will the same journey take?

55 Questions·
multiple choicetrue false

Sample Questions

1multiple choice
3 marks

A school has provisions for 80 students for 15 days. If 20 more students join, how many days will the provisions last?

Show answer

12 days

More students mean fewer days, so use inverse proportion. Total student-days = 80 × 15 = 1200. For 100 students, days = 1200 ÷ 100 = 12 days.

2multiple choice
3 marks

5 workers can move 4500 bricks in a day. How many workers are needed to move 18000 bricks in a day?

Show answer

20 workers

This is direct proportion. Use the rule of three: 4500 : 18000 :: 5 : x. So x = (18000 × 5) ÷ 4500 = 20 workers.

3multiple choice
3 marks

2 pumps fill a tank in 18 hours. How long will 4 pumps of the same kind take to fill the same tank?

Show answer

9 hours

Pumps and time are inversely proportional. Product stays constant: 2 × 18 = 4 × x. So x = 36 ÷ 4 = 9 hours.

4multiple choice
3 marks

The ratio of students scoring grades A, B, C, D, and E is 12:10:8:6:4. What is the simplest form of this ratio?

Show answer

6:5:4:3:2

Divide every term by the HCF, which is 2. So 12:10:8:6:4 becomes 6:5:4:3:2.

+51 more questions on Proportional Reasoning-2 (CBSE Class 8 Mathematics)

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Frequently Asked Questions

What are the important topics in Proportional Reasoning-2 for CBSE Class 8 Mathematics?
Key topics in Proportional Reasoning-2 include Proportionality and Cross-Multiplication, Ratios with More than Two Terms, Dividing a Whole in a Ratio, Ratios in Maps and Representative Fraction. Study these first, then practise questions on each for Class 8 exams.
How many practice questions are there for Proportional Reasoning-2?
There are 55 questions on Proportional Reasoning-2. Try the 4-question sample quiz on this page first; each answer shows an explanation when you tap it.

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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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