Page 68 - CT&AI_CLasa_7_Part_1

Based on these observations, which 8. A student observes:
conclusion is most appropriate? • Iron nail: hard, lustrous, sonorous
(Pattern Recognition)
• Coal: dull, brittle, non-sonorous
(a) The material is a non-metal • Wood: hard, poor conductor of heat and
because it is shiny. electricity

(b) The material is a metal because it To classify a material, which steps should be
shows multiple metallic properties. followed? (Decomposition)
(a) Check only one property
(c) The material is wood because it is
hard. (b) Check multiple properties like

(d) The material is plastic because it lustre, hardness, conductivity
allows electricity to pass through it.
(c) Guess randomly
6. Observe the pattern:
Iron gets coated with a reddish-brown (d) Check only the colour of the
flaky substance material
Copper forms a green coating
Silver turns black when exposed to air for a 9. A student performs an experiment to find out
long time the conditions required for the rusting of iron
using three jars, as shown in the diagram:
What is the underlying concept?
(Pattern Recognition)
(a) Only metals that contain iron
A Thread
show corrosion.

(b) All metals react in exactly the Iron nail
same way with air. Silica gel

(c) Metals react with environment Jar A
causing corrosion.

(d) All types of non-metals corrode. B Thread

7. A student wants to identify whether a Oil
material is a metal. Which set of steps best Iron nail
decomposes this task? (Decomposition) Water
(a) Check colour Check cost Jar B
Check size

(b) Check lustre Test conductivity
Test malleability C Thread

(c) Check weight Check shape Iron nail
Check texture
Water
(d) Heat the material Observe softness
Check the change in state Jar C

66 Computational Thinking-7 (Science)