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Lesson 9 of 10

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Seven quick questions. Use the table if you get stuck.

Materials Around Us, one rule from each lesson
LessonThe rule
Object or materialThe thing, and what it is made of.
Hard or softA hard material is hard to press in or scratch.
See-throughTransparent: clear. Translucent: a glow. Opaque: nothing.
Float or sinkHeavy for its size sinks. Light for its size floats.
DissolveA dissolved solid is still there, too small to see.
Right materialPick the property the job needs.
Shiny or dullA shiny material has lustre. A dull material has no lustre.

A steel spoon and a wooden spoon are side by side. What is true?

  • They are the same material
  • They are the same object, in different materials
  • Only one is a spoon

A steel file scratches a glass bangle. The bangle does not scratch the file. Which is harder?

  • The bangle
  • The file
  • They are equal

You look through coloured glass. The picture is clear, with a little colour. What is the glass?

  • Opaque
  • Transparent
  • Translucent

A big steel bowl floats. A small steel nail sinks. What decides this?

  • The bowl is made of a lighter kind of steel
  • How heavy each is for its size
  • The nail is old

You stir salt into water until you cannot see it. Where is the salt?

  • Gone
  • Spread through the water
  • At the bottom, as lumps

Aluminium foil is shiny. An eraser is dull. Which has lustre?

  • The eraser
  • The foil
  • Both

Which material is best for a raincoat?

  • Cotton cloth
  • Plastic sheet
  • Paper

Open Chapter 6, Materials Around Us, in your NCERT book. Find these seven ideas in it.

Next: Temperature and its Measurement. Put a number on hot and cold.

Reveal every answer to finish this lesson.