Hazardous Materials

19 Grade 9 Pre-Technical Studies questions on Hazardous Materials, with worked marking schemes. 19 questions are available on this topic in full.

1. Question 1

   1 mark

   Which document gives detailed information on the hazards, safe handling and first-aid measures for a chemical product?

   A. The workshop timetable

   B. The tool inventory list

   C. The Safety Data Sheet (SDS)

   D. The delivery note

   (1 mark)

   Marking scheme for this question

   Create a free account to see it

2. Question 2

   1 mark

   After using a toxic solvent in the workshop, the empty container should be

   A. buried near the school garden

   B. disposed of safely according to the label instructions

   C. burnt in the open compound

   D. reused to store drinking water

   (1 mark)

   Marking scheme for this question

   Create a free account to see it

3. Question 3

   6 marks

   A learner is working in a workshop where paints, thinners and adhesives are stored. The teacher warns the class about handling hazardous materials.

   (a) Define a hazardous material. (2 marks)

   (b) Give TWO ways the learner can safely handle and store these materials in the workshop. (4 marks)

   (6 marks)

   Marking scheme

   (a) A hazardous material is any substance that can cause harm or injury to people, property or the environment because it is, for example, flammable, toxic (poisonous), corrosive, irritant or explosive. (2 marks) (b) Any TWO of (2 marks each): store the materials in clearly labelled, tightly closed containers; keep flammable materials (paints, thinners) away from heat, sparks and open flames; store in a cool, dry, well-ventilated place; wear protective equipment such as gloves, goggles and a mask when handling them; keep them out of reach of unauthorised persons; read and follow the safety/instruction label before use; dispose of waste and empty containers properly instead of pouring into drains. (Total 4 marks)

4. Question 4

   1 mark

   Which is the BEST way to store corrosive chemicals such as strong acids in a school workshop?

   A. Next to the fire exit in cardboard boxes

   B. Mixed together in one large drum to save space

   C. In open tins on an open shelf

   D. In clearly labelled, sealed containers in a cool, well-ventilated store away from other materials

   (1 mark)

   Marking scheme for this question

   Create a free account to see it

5. Question 5

   3 marks

   Outline three effects that improper handling of hazardous materials could have on people and the environment.

   (3 marks)

   Marking scheme for this question

   Create a free account to see it

6. Question 6

   4 marks

   A workshop stores paints, thinners and acids.

   (a) Identify two hazards these materials could pose.

   (b) State one precaution for each hazard.

   (4 marks)

   Marking scheme

   (a) Two hazards (1 each): thinners/paints are flammable (fire risk); acids are corrosive (burns to skin/eyes); toxic fumes can be inhaled. (b) Matching precautions (1 each): store flammables away from heat/flames and keep a fire extinguisher; wear gloves/goggles and store acids in sealed labelled containers; ensure ventilation/wear a respirator for fumes.

7. Question 7

   1 mark

   An oxidising material is dangerous mainly because it

   A. provides oxygen that helps other materials burn more fiercely

   B. freezes at room temperature

   C. is safe to eat in small amounts

   D. cannot react with any other substance

   (1 mark)

   Marking scheme for this question

   Create a free account to see it

8. Question 8

   1 mark

   Why should flammable liquids NOT be stored near an electric switch or open flame?

   A. Their vapours can ignite and cause a fire or explosion

   B. They will evaporate and become harmless

   C. They will lose colour in the light

   D. The switch will corrode quickly

   (1 mark)

   Marking scheme for this question

   Create a free account to see it

9. Question 9

   1 mark

   Which symbol on a container warns the user that the material inside can easily catch fire?

   A. A skull and crossbones

   B. A flame symbol

   C. A pair of crossed hammers

   D. An exclamation mark in a triangle

   (1 mark)

   Marking scheme for this question

   Create a free account to see it

10. Question 10

    1 mark

    A learner finds a container of paint thinner in the workshop labelled with a flame symbol. Before using it, the learner should understand that this symbol warns that the material is:

    A. Corrosive to metals only

    B. Flammable and can easily catch fire

    C. Safe for skin contact

    D. Heavy and may cause injury if dropped

    (1 mark)

    Marking scheme for this question

    Create a free account to see it

11. Question 11

    1 mark

    A worker spills a corrosive liquid on the workshop floor. The FIRST correct action is to

    A. continue working and clean it later

    B. cover it with dry paper and ignore it

    C. wash it into the nearest drain immediately

    D. warn others, wear protective gear and contain the spill

    (1 mark)

    Marking scheme for this question

    Create a free account to see it

12. Question 12

    6 marks

    A learner notices a container of paint thinner in the workshop labelled with a flame symbol.

    (a) State what the flame symbol on the container warns the learner about. (2 marks)

    (b) State TWO safety practices the learner should follow when handling and storing this material. (4 marks)

    (6 marks)

    Marking scheme

    (a) The flame symbol warns that the material is flammable, that is, it can easily catch fire when exposed to heat, sparks or a naked flame. (2 marks) (b) Safety practices (any TWO, 2 marks each): - Keep the thinner away from naked flames, sparks and heat sources, and switch off any nearby ignition source. - Store it in a tightly closed, labelled container in a cool, well-ventilated area away from other chemicals and sources of heat. - Use it only in a well-ventilated room, wear protective gloves and avoid skin and eye contact, and keep a fire extinguisher nearby.

13. Question 13

    3 marks

    State three ways of safely handling hazardous materials in the workshop.

    (3 marks)

    Marking scheme

    Any three (1 mark each): read and follow the label/Safety Data Sheet instructions; wear appropriate PPE (gloves, goggles, apron, mask); store in labelled, sealed containers away from incompatible materials; keep flammables away from heat/sparks; ensure good ventilation; wash hands after handling; dispose of waste and containers safely.

14. Question 14

    1 mark

    During a practical lesson, a learner is required to handle a corrosive cleaning chemical. Which set of personal protective equipment (PPE) is most appropriate?

    A. Only a paper hat

    B. Gloves, goggles and an apron

    C. Open sandals and shorts

    D. A wristwatch and earrings

    (1 mark)

    Marking scheme for this question

    Create a free account to see it

15. Question 15

    1 mark

    After using a cleaning chemical that gives off strong fumes, a workshop assistant feels dizzy. The MOST appropriate immediate action is to:

    A. Continue working to finish the task

    B. Drink the chemical to test its strength

    C. Seal all windows and doors

    D. Move to an open area with fresh air and ventilate the workshop

    (1 mark)

    Marking scheme for this question

    Create a free account to see it

16. Question 16

    2 marks

    Explain the importance of labelling containers that hold hazardous materials.

    (2 marks)

    Marking scheme for this question

    Create a free account to see it

17. Question 17

    3 marks

    Describe three measures for the safe disposal of hazardous waste from a workshop.

    (3 marks)

    Marking scheme

    Any three (1 mark each): follow disposal instructions on the label/SDS; keep hazardous waste in clearly labelled, sealed containers; do not pour chemicals into drains or open ground; separate incompatible wastes; hand over to a licensed/authorised waste handler; never burn toxic materials in the open.

18. Question 18

    1 mark

    A learner finds containers of paint thinner and varnish stored next to a heater in the workshop store. The teacher asks the class to identify the main hazard these flammable liquids pose. Which statement best describes the correct precaution?

    A. They are safe near heat because the lids are tightly closed

    B. They should be poured into open trays to let fumes escape into the room

    C. They should be kept away from heat and naked flames in a cool, well-ventilated store

    D. They can be stored anywhere as long as they are labelled

    (1 mark)

    Marking scheme for this question

    Create a free account to see it

19. Question 19

    1 mark

    A pupil finds a bottle in the workshop labelled with a skull and crossbones. This symbol means the substance is

    A. radioactive

    B. poisonous/toxic

    C. flammable

    D. biodegradable

    (1 mark)

    Marking scheme for this question

    Create a free account to see it

20. 14 more marking schemes are on this page. A free account opens all of them, and lets you build your own paper on the topics you have actually taught, laid out in KNEC format with its full marking scheme.

    Create a free account

More Grade 9 Pre-Technical Studies topics