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Primary 5 Science Materials Quiz
Free P5 Science Materials quiz, Ox Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.
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Answers
Primary 5 Science Quiz - Materials — Answer Key
Answer 1.
(2) Copper wire. Metals are good conductors of electricity; rubber, plastic and wood are insulators. [2]
Answer 2.
(2) It is waterproof, so it keeps the wearer dry. [2]
Answer 3.
(2) Poor conductors of heat, so the handle stays cooler and is safe to hold. [2]
Answer 4.
(3) Size. Only the type of paper towel may change; all other variables must be kept the same for a fair test. [2]
Answer 5.
(2) Strong and stiff, so it holds heavy books without bending or breaking. [2]
Answer 6.
- Conductors of electricity: iron nail, aluminium foil
- Non-conductors (insulators): rubber band, woollen glove [2]
Answer 7.
(i) Rubber is waterproof, so water does not leak out of the hose. (ii) Rubber is flexible, so the hose can bend easily without cracking. [2]
Answer 8.
Metal is a good conductor of heat, so heat passes quickly through the pot to cook the food evenly. Plastic is a poor conductor of heat and would melt over a flame, so it cannot be used. [2]
Answer 9.
- Hair tie (rubber): flexible
- Rain boots (rubber): waterproof [2]
Answer 10.
Metal is a good conductor of heat, so heat from the soup travelled up the metal spoon to its handle. Plastic is a poor conductor of heat, so little heat travelled up the plastic spoon and its handle stayed cool. [2]
Answer 11.
(a) The steel paper clip and the aluminium foil strip. Both are metals, so they complete the circuit and current flows to light the bulb. [1] (b) Plastic is a non-conductor (insulator) of electricity, so it does not allow current to flow through the gap. The circuit stays incomplete, so the bulb does not light up. [2]
Answer 12.
Choice: Umbrella A Reason 1: Water cannot pass through the plastic-coated fabric, so the user stays dry. Reason 2: It stays light and whole when wet, unlike B which becomes heavy and C which tears apart. [3]
Answer 13.
(a) The number of layers of wool wrapped around the beaker (1, 3, 5 layers). [1] (b) Any two of: volume of water (200 mL), starting temperature (80 °C), identical beakers, same type of wool, measurements taken at the same time intervals. [1] (c) Beaker C. Wool is a poor conductor of heat, and more layers trap heat better, so heat is lost most slowly from beaker C. [1]
Answer 14.
The styrofoam box. Styrofoam is the poorest conductor of heat of the three materials, so heat from the surroundings passes into the box most slowly. The ice cube gains heat at the slowest rate and stays solid the longest. [3]
Answer 15.
(a) Nylon, because it held the most marbles (40) before snapping. [1] (b) To ensure a fair test — only the type of string was changed while length and thickness were kept the same. [1] (c) Repeating the test and averaging reduces the effect of any unusual (anomalous) result or human error, so the results are more reliable. [1]
Answer 16.
- Bends easily: rubber hose, leather belt, sponge
- Does not bend easily: steel ruler, glass sheet, brick [3]
Answer 17.
Copper core: Copper is a good conductor of electricity, so it carries the electric current efficiently. Plastic covering: Plastic is an insulator (non-conductor) of electricity, so it protects users from electric shocks and prevents short circuits. [3]
Answer 18.
(a) Any two of:
- The volumes of water were different (300 mL vs 500 mL).
- The thicknesses of wrapping were different (thick wool vs thin cotton). [2] (b) Use the same volume of hot water in both bottles and wrap each bottle with the same thickness of material. [1]
Answer 19.
(a) Wool. [1] (b) From the graph, after 30 minutes the water wrapped in wool had the highest temperature (55 °C), compared with felt (48 °C) and thin cotton (38 °C). Its water lost heat most slowly, showing wool conducts heat away least well, so wool is the poorest conductor of heat. [2]
Answer 20.
Choice: Material P (Wood) Reason 1: Wood is strong enough to support pupils safely, whereas thin plastic breaks easily. Reason 2: At 20) and lighter than metal, making the chairs easier to move. [3]
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