A comprehensive collection of topical evaluation activities, guiding questions, and authentic Uganda National Examinations Board (UNEB PLE 2018–2024 & National Mock) past exam questions, complete with official examiners' marking schemes and candidate pitfall notes.
Question 1 • Section A [1 Mark]
P.6
The Respiratory System
📌 UNEB PLE 2024, Question 3
State any one function of the diaphragm during the process of breathing.
✅Official UNEB Marking Guide / Expected Answer:
The diaphragm changes the volume of the chest cavity to facilitate respiration (or: it contracts and relaxes to allow air in and out of the lungs).
Question 2 • Section A [1 Mark]
P.6
Classification of Animals
📌 UNEB PLE 2024, Question 5
The diagram below shows an animal in the group of invertebrates. (Snail diagram) Name the animal shown.
✅Official UNEB Marking Guide / Expected Answer:
A snail (or Garden snail / Water snail).
Question 3 • Section A [1 Mark]
P.6
Alcohol, Smoking and Drugs
📌 UNEB PLE 2024, Question 14
State any one way in which fermentation is important in our daily life.
✅Official UNEB Marking Guide / Expected Answer:
Fermentation is used in making local brews / alcohol, production of biogas, making yoghurt, cheese, and ghee, or bread baking.
Question 4 • Section A [1 Mark]
P.6
Classification of Animals
📌 Kolfram National Mock Championship 2024, Question 1
Name the part of an insect used for balancing during flight.
✅Official UNEB Marking Guide / Expected Answer:
Halteres.
Question 5 • Section A [1 Mark]
P.6
Sound Energy
📌 Kolfram National Mock Championship 2024, Question 11
Which part of the human body is affected by Otalgia?
✅Official UNEB Marking Guide / Expected Answer:
Human ears (specifically middle ear pain/earaches).
Question 6 • Section A [1 Mark]
P.6
Keeping Cattle
📌 National Pre-PLE Mock Championship 2025, Question 1
Name the part of a cow that changes the color when a cow is on heat.
✅Official UNEB Marking Guide / Expected Answer:
The vulva (it becomes swollen and red).
SECTION B: STRUCTURED QUESTIONS (4 Marks Each)
Question 7 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Name two methods of obtaining clean water for washing at home.
✅Official UNEB Marking Guide / Expected Answer:
Filtration
Decantation
Question 8 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
In which method of making water clean do you first allow the impurities to settle at the bottom of a container?
✅Official UNEB Marking Guide / Expected Answer:
Decantation (or Sedimentation).
Question 9 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
How does chlorine make water safe for drinking?
✅Official UNEB Marking Guide / Expected Answer:
Chlorine kills germs / pathogens in the water.
Question 10 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Why is water obtained by the distillation method not recommended for drinking at home?
✅Official UNEB Marking Guide / Expected Answer:
Distilled water lacks essential mineral salts required by the human body to stay healthy.
Question 11 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
How does boiling make water safe for drinking?
✅Official UNEB Marking Guide / Expected Answer:
The high temperature (100°C) denatures and kills all disease-causing germs in the water.
Question 12 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Mention one way in which you can prevent some clothes from staining others during washing.
✅Official UNEB Marking Guide / Expected Answer:
Sorting the clothes by color (separating whites from bleeding colored clothes) before washing.
Question 13 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Give any two examples of water impurities.
✅Official UNEB Marking Guide / Expected Answer:
Any two of: Silt/mud, human/animal wastes, agro-chemicals, industrial wastes, or rust.
Question 14 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
State any one danger of hanging colored clothes under direct sunshine for a long time to dry.
✅Official UNEB Marking Guide / Expected Answer:
Direct solar heat and ultraviolet (UV) rays cause the colors/dyes of the fabrics to fade.
Question 15 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
State any two ways in which washing clothes is important to human health.
✅Official UNEB Marking Guide / Expected Answer:
Any two of:
Prevents the spread of skin diseases (like scabies and ringworms).
Prevents the breeding of ectoparasites (like body lice, bedbugs, and mites).
Eliminates bad body odors.
Question 16 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
State the reason why woolen clothes should be dried flat without wringing (twisting).
✅Official UNEB Marking Guide / Expected Answer:
Twisting or wringing wool stretches, distorts, and breaks the delicate protein fibers, ruining the permanent shape of the garment.
Question 17 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
State any one way in which the ironing of clothes is useful when cleaning clothes.
✅Official UNEB Marking Guide / Expected Answer:
Ironing removes wrinkles/creases to make them look smart, and the heat kills any remaining germs and parasite eggs hidden in the seams.
Question 18 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 UNEB PLE 2023, Question 14
State the scientific function of soap in cleaning clothes.
✅Official UNEB Marking Guide / Expected Answer:
Soap emulsifies grease/oil, lifts dirt, or weakens stains on fabrics.
Question 19 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
How is a burn different from a scald?
✅Official UNEB Marking Guide / Expected Answer:
A burn is a skin injury caused by dry heat (hot metals, flames, acid, or electricity), whereas a scald is caused by wet/moist heat (boiling water, steam, hot porridge, or soup).
Question 20 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Give any one reason why a burnt or scalded part of the skin is dipped in cold water immediately.
✅Official UNEB Marking Guide / Expected Answer:
Any one of:
To cool down the temperature around the skin tissue.
To reduce swelling and relieve severe pain.
To prevent the formation of blisters and further deep cell damage.
Question 21 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Why is it not advisable to burst blisters on a burnt part of the skin?
✅Official UNEB Marking Guide / Expected Answer:
Blisters act as a protective skin barrier; bursting them creates an open wound that exposes raw tissue to bacteria, causing infections.
Question 22 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
How is tepid sponging useful to a casualty with high fever?
✅Official UNEB Marking Guide / Expected Answer:
It cools down the high body temperature and opens sweat pores, helping release excess body heat to prevent convulsions.
Question 23 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
What kind of water is recommended for use during tepid sponging, and why should very cold water be avoided?
✅Official UNEB Marking Guide / Expected Answer:
Lukewarm water is used. Very cold water must be avoided because it causes shivering, which reflexively increases internal body heat production.
Question 24 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Why is it not advisable to give a convulsing or fainted person food to eat or water to drink?
✅Official UNEB Marking Guide / Expected Answer:
It can cause the food or drink to enter the windpipe (trachea) instead of the esophagus, leading to choking and sudden death.
Question 25 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Give a reason why a hard object (wrapped in a clean cloth) should be put in the mouth of a convulsing victim.
✅Official UNEB Marking Guide / Expected Answer:
To prevent the casualty from biting their tongue during violent, uncontrolled muscle shaking.
Question 26 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Why is it raised legs that are required when giving first aid to a person who has fainted?
✅Official UNEB Marking Guide / Expected Answer:
Elevating the legs uses gravity to allow the easy flow of oxygenated blood from the lower body back to the brain to restore consciousness.
Question 27 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Give one reason why a person who has fainted should be placed in a cool, open, and well-ventilated space.
✅Official UNEB Marking Guide / Expected Answer:
To ensure they get plenty of fresh air and oxygen to aid quick recovery.
Question 28 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Why does prolonged hunger sometimes lead to fainting?
✅Official UNEB Marking Guide / Expected Answer:
Prolonged hunger drops blood glucose levels, which reduces the supply of energy and oxygen reaching brain cells.
Question 29 • Section A [1 Mark]
P.6
Sanitation
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
State the scientific function of the screen (wire mesh) on top of the vent pipe of a VIP latrine.
✅Official UNEB Marking Guide / Expected Answer:
To trap houseflies and blowflies inside the vent pipe. They are attracted to the light at the top of the pipe, get trapped by the screen, and eventually starve to death, breaking their breeding cycle.
Question 30 • Section A [1 Mark]
P.6
Sanitation
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Why is the drop hole of a VIP latrine left open without a lid at all times?
✅Official UNEB Marking Guide / Expected Answer:
To allow fresh air to flow freely down into the pit and push smelly gases up and out through the vent pipe.
Question 31 • Section A [1 Mark]
P.6
Sanitation
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
How does the Ecosan latrine promote agricultural productivity?
✅Official UNEB Marking Guide / Expected Answer:
It separates and dehydrates feces using ash, converting human waste into safe, organic manure (fertilizer) to improve soil fertility in gardens.
Question 32 • Section A [1 Mark]
P.6
Sanitation
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
State the function of the U-trap in a water closet (flush toilet).
✅Official UNEB Marking Guide / Expected Answer:
The U-trap holds a small pool of clean water which acts as a liquid barrier to prevent bad smells and foul sewer gases from entering the toilet room.
Question 33 • Section A [1 Mark]
P.6
Sanitation
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Why is it dangerous to pour highly acidic substances or strong chemical insecticides into a pit latrine?
✅Official UNEB Marking Guide / Expected Answer:
Strong acids and insecticides kill the useful putrefying bacteria responsible for decomposing organic waste, which would cause the latrine to fill up very quickly.
Candidate Pitfall / Examiner Note: "Abstaining from sex" is a practice, not a psychological life skill.
Question 40 • Section A [1 Mark]
P.6
The Reproductive System
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Why is a husband and his wife advised to go for treatment together when they contract gonorrhoea?
✅Official UNEB Marking Guide / Expected Answer:
To prevent re-infection between the partners.
Question 41 • Section A [1 Mark]
P.6
The Reproductive System
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
State the biological function of the ciliated cells lining the fallopian tubes.
✅Official UNEB Marking Guide / Expected Answer:
To sweep/move the passive, non-motile ovum toward the uterus.
Question 42 • Section A [1 Mark]
P.6
The Reproductive System
📌 UNEB PLE 2024, Question 34
Give any one example of an emotional change in adolescents.
✅Official UNEB Marking Guide / Expected Answer:
They develop mood swings, get more interested in members of the opposite sex, get disappointed easily, become rebellious, form peer groups, or become ambitious.
Question 43 • Section A [1 Mark]
P.5
Types of Changes in the Environment
📌 P.5 Science Coursebook (Term 3)
Name any one living thing that undergoes moulting in the environment.
✅Official UNEB Marking Guide / Expected Answer:
Snake OR Cockroach OR Grasshopper OR Crab OR Spider.
💡
Candidate Pitfall / Examiner Note: Accept any reptile or arthropod that sheds its outer skin/cuticle for growth.
Question 44 • Section A [1 Mark]
P.5
Types of Changes in the Environment
📌 P.5 Science Coursebook (Term 3)
Why is the burning of dry paper classified as a chemical change?
✅Official UNEB Marking Guide / Expected Answer:
Because it is irreversible AND forms completely new substances (charcoal, ash, and carbon dioxide).
💡
Candidate Pitfall / Examiner Note: Candidate must emphasize that a new substance is formed or that it cannot be turned back into paper.
Question 45 • Section A [1 Mark]
P.5
Types of Changes in the Environment
📌 P.5 Science Coursebook (Term 3)
State the role of anhydrous calcium chloride in the laboratory investigation of rusting.
✅Official UNEB Marking Guide / Expected Answer:
To absorb all moisture/water vapour from the air inside the test tube (keeps the air dry).
💡
Candidate Pitfall / Examiner Note: Keyword is 'absorbs moisture' or 'dries the air'.
Question 46 • Section A [1 Mark]
P.5
Types of Changes in the Environment
📌 UNEB PLE Science Past Papers
Give any one danger of rusting to a school farmer's tools.
✅Official UNEB Marking Guide / Expected Answer:
It makes sharp cutting tools blunt OR weakens hoes/pangas OR causes tools to break easily.
💡
Candidate Pitfall / Examiner Note: Award 1 mark for any mechanical damage or blunting of tools.
Question 47 • Section A [1 Mark]
P.5
Types of Changes in the Environment
📌 UNEB PLE Science Past Papers
What scientific term describes the direct change of a solid into a gas without melting into a liquid?
✅Official UNEB Marking Guide / Expected Answer:
Sublimation.
💡
Candidate Pitfall / Examiner Note: Check spelling of 'Sublimation'.
Question 48 • Section A [1 Mark]
P.5
Types of Changes in the Environment
📌 P.5 Science Coursebook (Term 3)
How does painting an iron gate prevent it from rusting?
✅Official UNEB Marking Guide / Expected Answer:
Painting covers the iron surface, preventing oxygen and moisture from coming into direct contact with the iron.
💡
Candidate Pitfall / Examiner Note: Must mention cutting off contact with oxygen and moisture.
Question 49 • Section A [1 Mark]
P.5
Keeping Goats, Sheep, and Pigs
📌 P.5 Science Coursebook (Term 3)
Name the female parent in goat farming.
✅Official UNEB Marking Guide / Expected Answer:
Doe (or Nanny goat).
💡
Candidate Pitfall / Examiner Note: Accept either Doe or Nanny goat.
Question 50 • Section A [1 Mark]
P.5
Keeping Goats, Sheep, and Pigs
📌 P.5 Science Coursebook (Term 3)
State any one advantage of castrating male piglets not intended for breeding.
✅Official UNEB Marking Guide / Expected Answer:
It prevents indiscriminate breeding OR promotes faster growth/fattening OR removes boar taint from pork OR makes them docile.
💡
Candidate Pitfall / Examiner Note: Award 1 mark for any correct management or meat-quality reason.
Question 51 • Section A [1 Mark]
P.5
Keeping Goats, Sheep, and Pigs
📌 UNEB PLE Science Past Papers
Why is the floor of a modern pigsty built with a gentle slope towards the drainage channel?
✅Official UNEB Marking Guide / Expected Answer:
To allow easy and rapid drainage of urine and wash water, keeping the pen dry and hygienic.
💡
Candidate Pitfall / Examiner Note: Must mention drainage or keeping the sty dry.
Question 52 • Section A [1 Mark]
P.5
Keeping Goats, Sheep, and Pigs
📌 UNEB PLE Science Past Papers
Give any one reason why veterinary doctors advise farmers NEVER to open the carcass of an animal suspected to have died of Anthrax.
✅Official UNEB Marking Guide / Expected Answer:
Because exposing the bacteria to oxygen/air causes them to form dormant spores that contaminate pasture and soil for decades.
💡
Candidate Pitfall / Examiner Note: Award 1 mark for mentioning 'spore formation' or 'spreading fatal spores'.
Question 53 • Section A [1 Mark]
P.5
Keeping Goats, Sheep, and Pigs
📌 P.5 Science Coursebook (Term 3)
Name the farm structure used to hold cattle or goats firmly during hand spraying, drenching, or vaccination.
✅Official UNEB Marking Guide / Expected Answer:
Livestock Crush (or Crush).
💡
Candidate Pitfall / Examiner Note: Check spelling of 'Crush'.
Question 54 • Section A [1 Mark]
P.5
Keeping Goats, Sheep, and Pigs
📌 UNEB PLE Science Past Papers
What term refers to the meat obtained from an adult sheep?
✅Official UNEB Marking Guide / Expected Answer:
Mutton.
💡
Candidate Pitfall / Examiner Note: Must be Mutton (not lamb, as question specifies adult sheep).
Question 55 • Section A [1 Mark]
P.5
Food and Nutrition
📌 P.5 Science Coursebook (Term 3)
What is meant by the term balanced diet?
✅Official UNEB Marking Guide / Expected Answer:
A meal that contains all the essential food nutrients in their correct amounts and proportions to maintain good health.
💡
Candidate Pitfall / Examiner Note: Award 1 mark. Keywords: all essential nutrients in correct proportions.
Question 56 • Section A [1 Mark]
P.5
Food and Nutrition
📌 UNEB PLE Science Past Papers
State any one advantage of breast milk over commercial infant formula milk.
✅Official UNEB Marking Guide / Expected Answer:
Breast milk contains antibodies OR is always sterile/clean OR comes at the correct temperature OR is free of cost OR promotes mother-child bonding.
💡
Candidate Pitfall / Examiner Note: Award 1 mark for any valid biological or economic advantage.
Question 57 • Section A [1 Mark]
P.5
Food and Nutrition
📌 UNEB PLE Science Past Papers
Why is a pregnant mother advised to eat plenty of food rich in iron?
✅Official UNEB Marking Guide / Expected Answer:
To enable the body to make enough haemoglobin (red blood cells) and prevent maternal anaemia.
💡
Candidate Pitfall / Examiner Note: Accept 'to prevent anaemia' or 'to make red blood cells'.
Question 58 • Section A [1 Mark]
P.5
Food and Nutrition
📌 P.5 Science Coursebook (Term 3)
Name the deficiency disease caused by a severe lack of Vitamin C in the diet.
Question 59 • Section A [1 Mark]
P.5
Food and Nutrition
📌 UNEB PLE Science Past Papers
State any one danger of bottle feeding to a four-month-old baby.
✅Official UNEB Marking Guide / Expected Answer:
High risk of bacterial infection causing diarrhea OR over-dilution leading to marasmus OR nipple confusion.
💡
Candidate Pitfall / Examiner Note: Award 1 mark for diarrhea, gastroenteritis, or marasmus.
Question 60 • Section A [1 Mark]
P.5
Food and Nutrition
📌 P.5 Science Coursebook (Term 3)
How does eating fresh oranges or lemons help prevent bleeding gums?
✅Official UNEB Marking Guide / Expected Answer:
They provide Vitamin C (Ascorbic acid) which strengthens gum blood capillaries and connective tissues.
💡
Candidate Pitfall / Examiner Note: Award 1 mark for mentioning Vitamin C.
Question 61 • Section A [1 Mark]
P.5
Primary Health Care (PHC)
📌 P.5 Science Coursebook (Term 3)
What is Primary Health Care (PHC)?
✅Official UNEB Marking Guide / Expected Answer:
Essential health care made universally accessible and affordable to individuals and families in the community through their full participation.
💡
Candidate Pitfall / Examiner Note: Award 1 mark for the standard Alma-Ata definition.
Question 62 • Section A [1 Mark]
P.5
Primary Health Care (PHC)
📌 UNEB PLE Science Past Papers
State any one element of Primary Health Care.
✅Official UNEB Marking Guide / Expected Answer:
Immunisation (EPI) OR Safe water and sanitation OR Maternal and child health OR Health education OR Food and nutrition OR Essential drugs OR Control of endemic diseases OR Treatment of common diseases.
💡
Candidate Pitfall / Examiner Note: Award 1 mark for any of the 8 elements.
Question 63 • Section A [1 Mark]
P.5
Primary Health Care (PHC)
📌 UNEB PLE Science Past Papers
Give any one reason why a residential living house should have large windows on opposite walls.
✅Official UNEB Marking Guide / Expected Answer:
To allow cross-ventilation (entry of fresh air and exit of stale air) to prevent respiratory infections.
💡
Candidate Pitfall / Examiner Note: Keyword: cross-ventilation or fresh air circulation.
Question 64 • Section A [1 Mark]
P.5
Primary Health Care (PHC)
📌 P.5 Science Coursebook (Term 3)
Why is it recommended to use clean wood ash at a tip-tap facility when soap is not available?
✅Official UNEB Marking Guide / Expected Answer:
Wood ash has alkaline antiseptic properties that destroy bacteria on hands.
💡
Candidate Pitfall / Examiner Note: Award 1 mark for 'kills germs' or 'acts like soap'.
Question 65 • Section A [1 Mark]
P.5
Primary Health Care (PHC)
📌 UNEB PLE Science Past Papers
State the minimum distance a pit latrine should be dug away from a domestic spring well or borehole.
Question 66 • Section A [1 Mark]
P.5
Primary Health Care (PHC)
📌 P.5 Science Coursebook (Term 3)
Name the community health workers who act as a frontline bridge between the village and health centres in Uganda.
✅Official UNEB Marking Guide / Expected Answer:
Village Health Teams (VHTs) / Community Health Workers.
💡
Candidate Pitfall / Examiner Note: Accept VHTs or Village Health Teams.
Question 67 • Section A [1 Mark]
P.7
The Muscular and Skeletal System
📌 PLE 2024 Section A
Name the disorder of the skeletal system where a bone moves away from its normal position at a joint.
✅Official UNEB Marking Guide / Expected Answer:
Dislocation (Reject: Fracture, Sprain, Strain)
💡
Candidate Pitfall / Examiner Note: Examiners strictly distinguish dislocation (displacement of bone from joint) from fractures (cracked/broken bone) and sprains (ligament damage).
Question 68 • Section A [1 Mark]
P.7
The Muscular and Skeletal System
📌 National Curriculum Guide
Give the scientific meaning of the term skeleton.
✅Official UNEB Marking Guide / Expected Answer:
A skeleton is the supporting structure of the body of an organism.
💡
Candidate Pitfall / Examiner Note: Reject 'A framework of bones in the body' because insects and soft-bodied animals have cuticles and hydrostatic skeletons without bones.
Question 69 • Section A [1 Mark]
P.7
The Muscular and Skeletal System
📌 PLE 2023 Section A
State the function of a ligament at a movable joint.
✅Official UNEB Marking Guide / Expected Answer:
It joins / attaches a bone to another bone at a joint. // Holds articulating bones in place to prevent dislocation.
💡
Candidate Pitfall / Examiner Note: Always mention 'at a joint'. Candidates who write 'joins bones together' without mentioning the joint lose the mark.
Question 70 • Section A [1 Mark]
P.7
The Muscular and Skeletal System
📌 P.7 Pre-PLE Mock Series
Name the longest and strongest bone found in the human body.
✅Official UNEB Marking Guide / Expected Answer:
Femur (or Thigh bone).
💡
Candidate Pitfall / Examiner Note: Ensure spelling is correct: Femur. The humerus is the longest in the arm, but the femur is the longest in the whole body.
Question 71 • Section A [1 Mark]
P.7
The Muscular and Skeletal System
📌 National Science Panel
Identify one airborne bacterial disease that affects the human skeleton.
✅Official UNEB Marking Guide / Expected Answer:
Tuberculosis of the spine / bones (or Spinal Tuberculosis / Pott's disease).
💡
Candidate Pitfall / Examiner Note: Do NOT write 'Tuberculosis' alone. In human skeleton questions, examiners require 'Tuberculosis of the spine / bones'.
Question 72 • Section A [1 Mark]
P.7
The Muscular and Skeletal System
📌 PLE Prep Guide
Why is an insect compelled to shed its outer covering periodically during growth?
✅Official UNEB Marking Guide / Expected Answer:
Because its exoskeleton is rigid / cannot stretch or expand to allow body growth.
💡
Candidate Pitfall / Examiner Note: Must link the non-stretching nature of the chitinous cuticle to the necessity of body expansion.
Question 73 • Section A [1 Mark]
P.7
Electricity
📌 PLE 2023 Item 12
State the fundamental law of electrostatics concerning like and unlike charges.
✅Official UNEB Marking Guide / Expected Answer:
Like electric charges repel each other, while unlike electric charges attract each other.
💡
Candidate Pitfall / Examiner Note: State both parts clearly: like charges repel, unlike charges attract.
Question 74 • Section A [1 Mark]
P.7
Electricity
📌 PLE 2022 Item 18
Give one reason why copper is the preferred metal for manufacturing electrical conducting cables in domestic installations.
✅Official UNEB Marking Guide / Expected Answer:
Copper is a very good conductor of electricity with low electrical resistance (and it is ductile and relatively affordable).
💡
Candidate Pitfall / Examiner Note: Highlight low electrical resistance or high conductivity.
Question 75 • Section A [1 Mark]
P.7
Electricity
📌 PLE 2021 Item 22
Why is an electric fuse constructed using a wire with a low melting point?
✅Official UNEB Marking Guide / Expected Answer:
So that it melts and breaks the circuit easily when excessive or dangerous electric current surges through.
💡
Candidate Pitfall / Examiner Note: Mention melting to break the circuit upon overcurrent.
Question 76 • Section A [1 Mark]
P.7
Electricity
📌 Mukono Mocks Item 15
Identify the chemical substance used as a depolarizer in a standard dry Leclanché cell.
✅Official UNEB Marking Guide / Expected Answer:
Manganese dioxide ($MnO_2$).
💡
Candidate Pitfall / Examiner Note: Manganese dioxide oxidizes hydrogen gas into water.
Question 77 • Section A [1 Mark]
P.7
Electricity
📌 NCDC P.7 Unit Test
In an electric circuit diagram, which instrument is always connected in series to measure electric current?
✅Official UNEB Marking Guide / Expected Answer:
An Ammeter.
💡
Candidate Pitfall / Examiner Note: Ammeters connect in series; voltmeters connect in parallel.
Question 78 • Section A [1 Mark]
P.7
Electricity
📌 Candidate Master Series
What is the color code of the earth wire in a modern standard three-pin plug?
✅Official UNEB Marking Guide / Expected Answer:
Green with yellow stripes (or solid green).
💡
Candidate Pitfall / Examiner Note: Brown = Live, Blue = Neutral, Green/Yellow = Earth.