CBSE Class 7 Science The World of Metals and Non metals (Class 7 NCERT New) Quiz 1

1. Activity 4.1 asks you to place items like a piece of copper, a piece of aluminium, and an iron nail on a hard surface and beat them with a hammer. What do you think generally happens to a metal piece when hammered this way?

A It becomes slightly flattened into a thin sheet B It breaks into small pieces C It remains completely unchanged D It melts into a liquid

2. Holistic Lens asks: What could be a potential reason it is generally considered that copper was discovered earlier than iron?

A Copper can occur in a usable form and requires lower temperatures to work with than iron B Iron is found pure and is easier to extract than copper C Copper is far rarer than iron, so people valued it more D People in early times disliked using iron for tools

3. According to Section 4.1.2, which statement about coal and sulfur is correct regarding wire-making?

A They are not ductile and cannot be drawn into wires B They can be drawn into strong, long wires like metals C They make better wires than copper and aluminium D They are ductile only when heated mildly

4. Section 4.1.3 asks you to compare sounds made by different materials when dropped. What sound is typically produced when a metal spoon or coin is dropped on the floor, compared with a piece of coal or wood dropped from the same height?

A A clear ringing sound, louder and more sonorous than coal or wood B No sound at all C A dull thud identical to coal or wood D A crackling sound that indicates breaking

5. Activity 4.2 suggests dropping several objects from a certain height. Which object is most likely to produce a louder, ringing sound on impact?

A A metal spoon or metal coin B A piece of coal C A block of wood D A dry sponge

6. In an activity, a metal spoon and a wooden spoon of similar size and thickness are immersed together in hot water and the upper ends are touched after a few minutes. Which spoon gets hotter at the upper end?

A The metal spoon B The wooden spoon C Both get equally hot D Neither gets hot

7. Based on the hot-water spoon activity, what does the observation about the hotter upper end tell us about heat transfer along the two spoons?

A Heat conducts well through metal and poorly through wood B Heat conducts well through wood and poorly through metal C Both metal and wood conduct heat equally well D Heat cannot travel through solids

8. Why are screwdriver handles commonly made of materials like plastic or rubber?

A They are poor conductors of electricity and help prevent electric shock B They make the screwdriver heavier for stability C They are shiny and improve the tool’s appearance D They conduct electricity well for testing live wires

9. Electricians often wear rubber gloves and shoes while working. What is the main reason for this practice?

A Rubber is a poor conductor of electricity and reduces the risk of electric shock B Rubber keeps hands and feet warm in cold weather C Rubber makes it easier to grip tools tightly D Rubber conducts electricity away from the body

10. In a tester-circuit activity, various objects are inserted one at a time: a piece of aluminium foil, an iron nail, a lump of sulfur, a copper wire, a piece of coal, a piece of dry wood, a stone, an eraser made of rubber, and a piece of nylon rope. What pattern is observed regarding which objects make the bulb glow?

A Objects that are metals make the bulb glow; non-metal objects listed do not B All objects make the bulb glow equally well C Only objects that are soft or light make the bulb glow D Objects that contain carbon make the bulb glow while others do not