alleryStart learning →A steel blank is repeatedly heated and hammered to form a knife blade. This changes the steel's
Acolour to red rust
Bhardness and flexibility
Cits element to zinc
Dmass into pure gas
Answer & Solution
Correct answer: B. hardness and flexibility
Heating and hammering alter physical properties such as hardness and flexibility without changing the substance.
Keep practising Physical and chemical changes
Browse all Physical and chemical changes questions for Olympiad (Class 7), or explore more Science topics.
Related questions
A change in colour during a process most reliably suggestsCopper turns green after long exposure to damp air. This shows copper hasWhich pair correctly matches the change with its type?Baking soda is added to vinegar and bubbles of gas appear. This showsWhich of these is a physical change?A chemical reaction changes the atoms of a substance byRusting is specifically the corrosion of which metal?Stainless steel resists rusting because it forms a thin layer of