# DBT JRF 2020 — Question 34

Exam: DBT JRF 2020 · Section: A · Topic: Aptitude & Reasoning · Difficulty: Easy

## Question

The aluminium bronze alloy consists of copper and aluminium in the ratio of 10:1 by weight. If an object made of this alloy weighs 77 Kilograms (Kg), how many Kg of aluminium does it contain?

## Options

- **A.** 7.7
- **B.** 70.7
- **C.** 7.0
- **D.** 0.7

## Answer

Option C

## Explanation

Cu:Al ratio by weight = 10:1, so total parts = 11. Mass of aluminium = $\dfrac{1}{11} \times 77 = 7.0 \text{ kg}$ . Mass of copper = $\dfrac{10}{11} \times 77 = 70.0 \text{ kg}$ . Check: 70.0 + 7.0 = 77 kg ✓. Aluminium bronze alloys are used for their corrosion resistance, high strength, and good conductivity.

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