7Class - Science - Changes around Us Test 2

Atmospheric pollution

• Due to chemical change
• The process of depositing one metal on another metal
• Slow change
• Physical change

Galvanisation

• Due to chemical change

• The process of depositing one metal on another metal

• Slow change

• Physical change

This metal is used as protective layer to prevent rusting in the process of galvanisation

• Copper
• Zinc
• Nickel
• Chromium

A + B <--> C + D Which type of reaction is this?

• Backward
• Forwardq
• Reversibe
• Irriversible

Burning of camphor is similar to

• burning of magnesium

• burning of wood

• breaking of glass

• burnng of wood and magnesium

Rust is

• Iron
• Oxygen
• Water
• Iron Oxide

Depositing one metal on another metal is

• Physical Change
• Rusting
• Galvanisation
• No answer

Which metal is generally used for galvanisation?

• Magnesium
• Zinc
• Iron
• Aluminium

What prevents the outer surface of potato from colouring?

• Grease
• Paint
• Cold Water
• Zinc