Page 69 - CT&AI_CLasa_7_Part_1

After a few days, rust appears only in jar C. 10. Choose the correct algorithm to test electrical
What is the correct conclusion? conductivity: (Algorithmic Thinking)
(Decomposition) (a) Observe Touch Conclude

(a) Only air causes rusting. (b) Connect battery Insert material

(b) Only water causes rusting. Check bulb glow

(c) Both air and water are required (c) Heat material Break it
for rusting. Observe

(d) Rusting does not need air. (d) Drop material Listen to sound

A student is given an unknown material and performs the following steps:
• Step 1: Checks if it is shiny.
• Step 2: Tests if it conducts electricity.
• Step 3: Hammers it to see if it flattens.
• Step 4: Drops it to check if it produces any sound.

The student observes that the material is shiny, conducts electricity, flattens on
hammering, and produces a ringing sound when dropped.
Based on the observation, what can the student conclude about the material?
(a) It is a non-metal because it is shiny.

(b) It is a metal because it shows all the key metallic properties.

(c) The material flattens on hammering, so it must be a non-metal.

(d) The material cannot be classified as a metal or non-metal based only
on these observations.

The World of Metals and Non-metals 67