Primary 5 Science Materials Quiz

TuitionGoWhere Primary School (AI)

Primary 5 Science - Materials

Quiz 01 | Answer Key

Section A: Multiple Choice Questions (2 marks each)

1. C) Copper

Metals like copper are good conductors of heat

2. B) Transparent

Transparent materials allow light to pass through completely

3. B) It is flexible

Rubber's flexibility allows tyres to absorb shocks and grip the road

4. B) They expand

Most materials, including metals, expand when heated

5. C) Metal (good conductor of heat)

Metal conducts heat well, allowing food to cook evenly

Section B: True or False (2 marks each)

6. F (False)

Only iron, steel, nickel, and cobalt are magnetic. Metals like aluminium and copper are not attracted to magnets.

7. T (True)

Water conducts heat better than air because water molecules are closer together.

8. T (True)

Rubber does not conduct electricity, making it an insulator.

9. F (False)

Glass is a man-made material, made from sand (silica) and other substances.

10. T (True)

Translucent materials allow some light to pass through but scatter it.

Section C: Short Answer Questions (4 marks each)

11. (a) Copper would be best for making electrical wires because it is a good conductor of electricity (allows electricity to flow through easily) and is not as expensive as silver. (2 marks)

(b) Pot handles are often made of plastic because plastic is a poor conductor of heat (heat insulator). This prevents heat from the pot from reaching our hands and burning us. (2 marks)

12. (a) Windows are made of glass because glass is transparent, allowing light to pass through so we can see outside and let natural light into the room. Wood is opaque and would block light. (2 marks)

(b) Electrical plugs have plastic casings to prevent electric shock since plastic is an insulator that does not conduct electricity. The metal pins conduct electricity to transfer power from the socket to the appliance. (2 marks)

13. (a) To keep constant:

• Size of ice cubes
• Amount/thickness of material used to wrap
• Starting temperature of ice
• Surrounding temperature/location (2 marks for any 2 correct answers)

(b) The ice cube wrapped in cotton or plastic will melt the slowest because they are poor conductors of heat (good insulators). They prevent heat from the surroundings from reaching the ice quickly. Aluminium foil is a good conductor, so heat will transfer quickly to the ice, causing it to melt faster. (2 marks)

Section D: Structured Questions (5 marks each)

14. (a) Conductors: Copper wire, Iron nail (1 mark) Insulators: Wooden spoon, Glass window, Rubber band (1 mark)

(b) Iron nail (1 mark)

Only iron is magnetic among the listed objects

(c) The copper wire is coated with plastic because:

• Plastic is an electrical insulator (1 mark)
• The plastic coating prevents electric shock when we touch the wire and prevents short circuits when wires come into contact with each other (1 mark)

15. (a) The inner container should be a poor conductor of heat / good heat insulator. (1 mark)

(b) A vacuum contains no air particles, so heat cannot be transferred by conduction or convection. This prevents heat from escaping from the hot drink or entering from outside, keeping the drink hot (or cold) for longer. (2 marks)

(c) The shiny/reflective inner surface reflects heat radiation back into the flask. This prevents heat loss through radiation, helping to keep the drink hot for longer. (2 marks)

Section E: Higher-Order Thinking (5 marks)

16. (a) Pan B (aluminium with wooden handle) would be the safest and most practical choice because:

• The aluminium base conducts heat well, allowing food to cook quickly and evenly (1 mark)
• The wooden handle is a poor conductor of heat, so it stays cool and prevents burns when holding the pan (1 mark)
• Pan A would have a hot handle that could burn the user; Pan C (ceramic) doesn't conduct heat as well and may crack with sudden temperature changes (1 mark)

(b) Non-stick coating prevents food from sticking to the pan, making cooking and cleaning easier. It also allows cooking with less oil. (1 mark)

(c) Aluminium is a metal and metals have free-moving electrons that transfer heat energy quickly. This means aluminium pans heat up faster and distribute heat more evenly, allowing food to cook faster and more uniformly. (1 mark)

Marking Scheme

End of Answer Key