Materials Separation and Changes (Class 6)

What this worksheet covers

This is an eighteen-question practice worksheet on materials, separation and changes for Class 6, written to the pattern of the SOF National Science Olympiad (NSO). It carries 24 marks and is designed to be attempted in 45 minutes, split across three sections — Scientific Reasoning, Applying What You Know and Achievers Section. Every question is multiple choice with exactly one correct option, and every one comes with a fully worked solution rather than just an answer key — so a child who gets one wrong can see where the reasoning went astray instead of only learning that it did.

Skills your child practises

• Applied problem-solving on materials, separation and changes at Class 6 level
• Working accurately against a time limit, as the real paper demands
• Scientific Reasoning questions in the olympiad format
• Applying What You Know questions in the olympiad format
• Achievers Section questions in the olympiad format
• Reading worked solutions to find the step that went wrong

How to use it

1. 1There are 18 questions in this worksheet. All questions are compulsory.
2. 2Each question has four options (A), (B), (C) and (D). Exactly one option is correct.
3. 3Questions 1–15 carry 1 mark each. Questions 16–18 (Achievers Section) carry 3 marks each.
4. 4There is no negative marking. Study every diagram and table carefully.

Sample questions from this worksheet

A preview of what's inside Materials Separation and Changes (Class 6) — the PDF has the full set, and every question comes with a worked solution like these.

1. 1. The property by which a metal can be beaten into thin sheets is called _______.

   • ADuctility
   • BMalleabilitycorrect
   • CSolubility
   • DLustre
   Solution: Malleability is the property of being beaten into sheets — gold and aluminium are highly malleable. Ductility is the property of being drawn into wires.

2. 2. Why does a burning candle show both a physical and a chemical change?

   • AThe wax melts (physical) and the wax burns to form new gases (chemical)correct
   • BOnly the wick burns
   • CThe candle only melts
   • DThe candle only changes shape
   Solution: Near the flame the solid wax melts and can set again — a physical change. At the flame itself the wax vapour burns, forming carbon dioxide and water vapour — a chemical change that cannot be reversed.

3. 3. Consider the following statements.(i) In a physical change, no new substance is formed.(ii) All metals are good conductors of heat and electricity.(iii) A mixture always has a fixed composition.Which of the statements is/are correct?

   • A(i) and (ii) onlycorrect
   • B(ii) and (iii) only
   • C(i) and (iii) only
   • DAll three
   Solution: Statement (i) is true. Statement (ii) is true as a general rule for metals. Statement (iii) is false; it is a compound that has a fixed composition, while a mixture can be made in any proportion — sugar solution can be weak or strong. Hence (i) and (ii).