Page 102 - SCERT Kerala State Syllabus 8th Standard Basic Science Textbooks English Medium Part 1_Neat

9 One of the reasons for the use of gold in
making ornaments is its metallic lustre
10 The ductility of tungsten is high

4. Which among the following metals is stored in kerosene?
(a) Sodium (b) Iron (c) Tungsten (d) Chromium
Why is it stored in kerosene?

5. The names of some metals are given below.
Tungsten, Gold, Sodium, Copper, Iron, Magnesium
Answer the following questions by selecting the

appropriate ones from the list.
Which metal with high malleability is used for making

ornaments?
Which of these metals reacts with cold water?
Which of these is a hard metal but corrodes easily?

6. Give reasons for the following statements.
• Tamarind is not stored in aluminium vessels.

• It is a common practice to apply oil on iron articles and
tools.
• Stainless steel knives, instead of iron knives, are
preferred for cutting citrous fruits.

Extended activities

1. Comparison of conductivity
Materials required
Identically sized wires of copper, iron, aluminium and
nichrome, torch bulb, 3 volt battery, switch

Procedure
Connect a torch bulb to the battery with the different metal
wires. Find out which wire gives the highest brightness to
the bulb? Arrange the wires in the decreasing order of their
electrical conductivity.
2. Collect the following materials: an iron nail, an aluminium
wire, a pencil lead, a copper wire, and the carbon rod of a
dry cell. Beat them hard using a hammer. Which of them

Basic Science VIII 101