📚 CBSE Grade-10 Study Guide Open in the Study Guide single page app →
Home › Science

Science — CBSE Class 10 board question

Q1. [1]
Among the following, the metal with lowest density is :
  1. (a) Lithium
  2. (b) Lead
  3. (c) Magnesium
  4. (d) Aluminium
Previously asked in CBSE board exam
2023 31/2/1 Q5
Generated by claude-sonnet-4-6 · 2026-06-15 06:47 · grounding rag
Model Answer

(a) Lithium

Alkali metals like lithium have low densities. Among the given options, lithium has the lowest density (~0.53 g/cm³).

Source: Physical Properties, Chapter 3, Section 3.1.1

Explanation

The textbook states that alkali metals (lithium, sodium, potassium) have low densities. Among the options — Lead (very dense), Magnesium and Aluminium (moderate density) — lithium is the lightest metal overall. Examiners expect you to recall this directly from the exceptions listed in Section 3.1.1.

If a question refers to an image, map, graph or diagram that is not shown here, open the Study Guide single page app, go to Library and find the actual CBSE question paper. The original papers are also available on the CBSE website: cbse.gov.in.
Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.