The World of Metals and Non-metals

Why is it important to study metals and non-metals?

1. They have no practical use.
2. Their properties help us choose suitable materials for different purposes.
3. They are important only for scientists.
4. They are used only in laboratories.

Which statement correctly compares metals and non-metals?

1. Both are always good conductors of electricity.
2. Metals generally conduct electricity well, while most non-metals do not.
3. Non-metals are always shiny.
4. Metals cannot be shaped.

Which metal is mainly used in making aircraft because it is lightweight?

1. Aluminium
2. Gold
3. Iron
4. Lead

Why are plastic coverings used over electrical wires?

1. Plastic is a metal.
2. Plastic is a good conductor of electricity.
3. Plastic is an insulator that prevents electric shocks.
4. Plastic increases electrical current.

Which of the following is a common use of non-metals?

1. Making electrical wires
2. Producing fertilizers and medicines
3. Building bridges
4. Manufacturing railway tracks

Which metal is used mainly in jewellery because of its shine and resistance to corrosion?

1. Gold
2. Iron
3. Zinc
4. Lead

Which non-metal is essential for breathing?

1. Oxygen
2. Copper
3. Aluminium
4. Iron

Which of the following is NOT a property of most metals?

1. Lustrous
2. Good conductor of electricity
3. Brittle
4. Malleable

Why are cooking utensils usually made of metals like aluminium or stainless steel?

1. They are transparent.
2. They are good conductors of heat.
3. They float on water.
4. They are brittle.

Which metal is commonly used for making electrical wires?

1. Copper
2. Sulphur
3. Phosphorus
4. Carbon

Which property allows metals to be drawn into wires?

1. Ductility
2. Malleability
3. Hardness
4. Brittleness

Which property is commonly shown by most metals?

1. They are poor conductors of electricity.
2. They are dull in appearance.
3. They conduct heat and electricity well.
4. They break easily when hammered.