HOME SCIENCE PAPER 1 - KCSE 2019 STAREHE PRE MOCK EXAMINATION (WITH MARKING SCHEME)

SECTION A (40 marks)
Answer all the questions in this section.

Differentiate between indirect and semi-direct methods of lighting. (2mrks)
Give two reasons for serving soup to the sick. (2mrks)
Give two disadvantages of cross method of ventilating a room. (2mrks)
Identify two suitable methods of cooking for an invalid and give a reason for each. (4mrks)
Differentiate between renewable and non-renewable resource and give an example of each. (4mrks)
Outline three qualities of a well ventilated kitchen. (3mrks)
Give three advantages of using improvised fuel. (3mrks)
Give two disadvantages of relying on solar energy in the home. (2mrks)
Highlight three limitations of using candles for lighting a home. (3mrks)
Outlined three disadvantages of using fans. (3mrks)
State three dangers of using electricity at home. (3mrks)
Explain two effects of bright colours in a room. (2mrks)
Explain conditioning as used in flower arrangement. (2mrks)
Give two reasons for keeping potatoes in cold water as soon as they are peeled. (2mrks)
Give three disadvantages of blue plate service. (3mrks)

SECTION B: COMPULSORY (20 MARKS)
Answer all the questions in this section.

You have been left in charge of the house during mid-term break.
1. Explain how you would launder your mother’s silk dress. (10mrks)
2. Describe how you would clean a Formica topped kitchen table. (6mrks)
3. Explain how to improvise a broom to be used to sweep an earthen floor of the kitchen. (4mrks)

SECTION C (40 MARKS)
Answer any two questions in this section.

1. With the aid of three well labeled diagrams, describe the procedure of making an overlaid seam. (10mrks)
2. Outline the steps to follow when mending a gaping seam of an apron. (7mrks)
3. State three general rules to be followed when repairing clothes. (3mrks)

1. Explain six points to consider when selecting furniture for a family. (6mrks)
2. Mention three nutritional disorders that are associated with lifestyle. For each disorder mentioned, give a point on how to manage it (6mrks)
3. State three points on prevention and point on management of fractures. (6mrks)
4. Give two reasons for shaving pubic hair. (2mrks)

1. Outline six measures to take to prevent spread of infections when caring for the sick at home. (6mrks)
2. Give six factors to consider when choosing fabric for making curtains or soft furnishing. (6mrks)
3. State four important points a lactating mother should observe for successful breastfeeding.(4mrks)
4. State four reasons for softening water for laundry work. (4mrks)

MARKING SCHEME

SECTION A

Difference between indirect & semi-direct lighting:
- Indirect lighting is where the light is brown onto the ceiling and the rays are reflected distributed to the whole room. The source of light is hidden. 1mrk
- Semi-direct lighting is where the source of light is covered with a shade which is inverted to provide light in all directions. 1mrk

Reasons for serving soup to the sick:
- To replace water lost through sweating and urination.
- To replenish the loss of nutrients.
- To allow easy digestion. 2x1=2mrks

Disadvantages of cross method of ventilating a room:
- It introduces draught in a room which may cause discomfort.
- It can lead to damage and accidents due to banging of doors and windows.
- The room tends to be cold and chilly. 2x1=2mrks

Suitable methods of cooking for an invalid and their reasons:
- Steaming – the food is easy to digest.
- The food is tender.
- Nutrients are not lost; they are retained in the food.
- Boiling – the food becomes soft and very tender.
- There is no use of oil so food does not require a lot of energy to digest.
- The liquid can be used to make soup which is rich in nutrients.
  Methods=1x2mrks, Reasons =1x2mrks

Difference between renewable and non-renewable resource:
- A renewable resource can be recycled and cannot be depleted e.g. biogas. 2mrks
- A non-renewable resource that cannot be recycled and gets depleted e.g. gas, paraffin. 2mrks
Qualities of a well ventilated kitchen:
- The kitchen is free from odours.
- The kitchen does not have smoke.
- The room has cool air.
- The room is comfortable to work in.
- The kitchen is free from a lot of heat. 3x1=3mrks

Advantages of using improvised fuel:
- They are readily available.
- They are cheap sources of fuel.
- They are easy to use. 3x1=3mrks

Disadvantages of relying on solar energy in the home:
- Its uses are limited to lighting, ironing and operating electrical appliances.
- There is shortage of power in case of prolonged cloud cover.
- The battery requires frequent replacement and it can be expensive. 2x1=2mrks

Limitations of using candles for lighting at home:
- They do not give a lot of light.
- They drip thus dirtying the area.
- When not carefully placed they can easily cause accidents.
- It produces smoke. 3x1=3mrks

Disadvantages of using fans:
- It can blow dust and cause discomfort if the room is dusty.
- It does not remove stale air in the room.
- It can trigger attacks on people who suffer from asthma and bronchitis because of cold air and wind. 3x1=3mrks

Dangers of using electricity at home:
- It can easily lead to fires if the sockets are overloaded.
- It can easily cause electrocution if not handled carefully.
- If the electric appliances are not repaired in time it can cause electric shock.
- If handled with wet hands it can cause electrocution to the user. 3mrks

Effects of bright colours in a room:
- It makes a room appear larger and spacious.
- It creates a mood of entertainment.
- It enhances lighting in the room. 2x1=2mrks

Conditioning as used in flower arrangement:
- It is standing flowers in cold water for a period of time to prevent withering. 2mrks

Reasons for keeping peeled potatoes in cold water:
- To prevent a hard skin from forming which interferes with cooking.
- To prevent colour change due to oxidation.
- To prevent sticking of dirt. 2x1=2mrks

Disadvantages of blue plate service:
- Does not promote togetherness as people eat from their preferred venues.
- Wastes food as sometimes one may not finish the food served.
- Tiring to the person serving. 3x1=3mrks

SECTION B:

1. Laundering a silk dress:
  - Collect cleaning equipment and materials (½)
  - Do not soak to avoid damaging the fibres (½)
  - Wash by kneading & squeezing method (½) in warm (½) soapy (½) water.
  - Use mild (½) detergent as strong alkalis cause discolouration of white silk and fading in coloured ones (½)
  - Gently (½) rub collars and cuffs to remove dirt
  - Rinse (½) thoroughly in warm (½) water to remove dirt and soap.
  - Use cold water (½) for the final rinse to which methylated spirit (½) is added to give a crispy and lustrous finish.
  - Squeeze (½) excess water by hand to avoid damaging the fibres if twisted.
  - For light silk fold (½) it in a clean towel to squeeze out moisture before finishing.
  - Use a warm iron (½) while working fast before the fabric dries (½) in order to produce a smooth gloss finish (½).
  - Air (½) to dry completely.
  - Fold (½) and store in a clean and dry place (½) ½ x 20=10mrks
2. Cleaning Formica topped table:
  - Collect all equipment and materials (½)
  - Dust to remove loose dirt (½)
  - Clean by wiping (½) with a cloth wrung out of warm (½) soapy(½) water a portion at a time overlapping sections (½)
  - Rinse thoroughly with a cloth wrung out of warm (½) clean water.
  - Dry with a clean dry absorbent cloth (½)
  - Clean the legs and under parts appropriately (1mrk)
  - Buff to shine (½)
  - Clean and store the equipment and materials used (½) ½ x 12 = 6mrks
3. Improvising a broom at home:
  - Cut long green grass/reeds (1mrk)
  - Tie together a bunch of the grass or reeds securing them firmly with a string. (1mrk)
  - Fold or trim the upper end and tie if folded to produce a firm neat edge. (1mrk)
  - Trim the lower end evenly. (1mrk) total = 4mrks

1. Working and overlaid seam:
  - Fold the overlay seam allowance to the wrong side (W.S) along the fitting line and press (1mrk)
  - Matching the fitting lines, place the folded edge of the overlay over the fitting line of the underlay. (1mrk)
  - Pin and tack through all layers. (1mrk)
  - Remove pins and machine stitch on the right side of the garment (1mrk) close to the fold through the three layers of the fabric (½)
  - Remove tackings and press (½)
    Stitching close to the fold
  - Trim the raw edges on the WS to 1cm (½) and neaten the raw edges by using any of the following; overcastting, machine zigzag, binding, loop stitches or by hemming (1mrk)
  - Press the completed work on both RS and WS (½)
    Well labeled diagrams = 3mrks
    Total =10mrks
2. Mending a gaping seam:
  - Mend before washing (½)
  - Remove any removing threading in the areas to be mended (1mrk)
  - Hold with pins the old stitching line adding some extra un-gaped portion if possible to prevent further gaping (1mrk)
  - Press the seam (1mrk)
  - Tack the seam using temporary stitches (1mrk)
  - Remove pins (½)
  - Make permanent stitches (1mrk)
  - Remove the temporary stitches (½)
  - Press the seam (½) total =7mrks
3. Rules when repairing clothes:
  - Repair as soon as noticed.
  - Make the repair as inconspicuous as possible unless decorative.
  - Mend before washing to avoid enlarging the tear. However clothes for the sick are repaired after washing to avoid contamination if the sick is suffering form a contagious disease.
  - Repair should cover worn out areas and the adjacent area adequately. 3x1=3mrks

1. Points to consider when selecting furniture for a family:
  - The size of the family in order to cater for every member of the family.
  - Durability – they should be well made with durable materials to avoid breaking.
  - The colour should blend well with the existing colour scheme of the house to enhance appearance.
  - The size of the room in order to avoid congestion or under congestion of a room.
  - It should be easy to care for to avoid expenses.
  - It should be easy to clean for hygienic purposes.
  - The design should match with the existing furniture.
  - It should be well constructed to last longer and to have a good finish and workmanship.
    6x1=6mrks
2. Lifestyle diseases and their management:
  - Gout (1mrk) – reduce intake of alcohol and roast meat
  - Give plenty of water to dilute uric acid. 1x1=1mrk
  - Exercise to reduce excess weight.
  - Give pain killers.
  - Obesity (1mrk) - Reduce intake of carbohydrates.
  - Avoid snacks.
  - Reduce fat intake.
  - Exercise the body regularly. 1x1=1mrk
  - Hypertensions (1mrk) – avoid and manage stress.
  - Reduce intake of salt.
  - Exercise the body to reduce weight.
  - Discontinue family planning methods which may cause high blood pressure. 1x1=1mrk
  - Anorexia-nervosa (1mrk) – take a balanced diet.
  - Seek guidance & counseling.
  - Take small quantities of food at regular intervals. 1x1=1mrk
  - Diabetes (1mrk) – limit the intake of carbohydrates and refined foods.
  - Increase intake of fluids and high fibre foods.
  - Check blood sugar levels regularly and take necessary action.
  - Do regular exercise.
  - Follow doctor’s dietary instructions.
  - Avoid sugary foods. 1x1=1mrk (total of 3 @ 2mrks each)=6mrks
3. 1. Prevention of fractures at home:
    - Repair floors and floor coverings as soon as possible.
    - Avoid spilling water and when it spills wipe immediately.
    - Ensure the furniture is in every room is well arranged.
    - Ensure that the houses are well lit.
    - Refuse should be appropriately disposed off especially in the kitchen and the compound.
    - Scrub the bathroom floors regularly to prevent floors being slippery.
      Any 3x1=3mrks
  2. Management of fractures:
    - Never push back a broken limb.
    - Incase of bleeding put a pad on it to apply pressure to stop the bleeding.
    - Do not massage a broken limb or attempt to set the bone.
    - Tie a sling on the arm for support if it is broken.
    - Give painkillers to relieve pain. 3x1=3mrks
4. Reasons for shaving pubic hair:
  - To reduce accumulation of dirt and perspiration.
  - To enhance the appearance of the body.
  - To prevent bad smell. 2x1=2mrks

1. Measures to prevent spread of infections when caring for the sick at home:
  - The person should wear appropriate protective clothing when attending the sick e.g. gloves, face masks and aprons.
  - The clothes of the sick should be well ventilated to curb accumulation of disease causing micro organisms.
  - Their feeding equipments and personal effects should be cleaned separately and disinfected.
  - By destroying agents and conditions that can aid in spread of diseases.
  - By isolating the patient in case the disease is highly contagious e.g. TB.
  - The person attending the sick should wash their hands and clothing thoroughly and disinfect them.
    6x1=6mrks
2. Points to consider when choosing fabric for curtains/soft furnishings:
  - The colour chosen should match the colour scheme of the room. It should blend well with the existing décor of the room.
  - The fabric should be long lasting to withstand wear and tear.
  - The fabric should be crease and shrink resistant to maintain size and shape.
  - The fabric should be fast coloured to avoid fading.
  - The fabric should have a good drape to enhance appearance.
  - The fabric should be attractive in design and colour to enhance appearance of the room.
  - The fabric should be easy to launder and resistant to abrasion.
  - The fabric should suit the area to be used to ensure good fit and serve its intended purpose.
    6x1=6mrks
3. Points on successful breastfeeding:
  - Take plenty of fluids such as milk, soup and porridge.
  - Take a balanced diet.
  - Maintain high standards of hygiene.
  - Position the baby properly on the breast to prevent breast feeding related problems.
  - Get enough sleep to relax mentally and physically.
  - Report any breastfeeding problems for the appropriate treatment.
    4x1=4mrks
4. Reasons for softening water for laundry:
  - To improve the lathering of soap.
  - To save on amount of detergent used.
  - To save time and energy when soft water is used for washing.
  - To avoid discolouration of clothes which is caused by scum formed in hard water.
  - To prevent formation of fur which block pipes and boilers.
  - To prevent roughness on user’s skin.
    4x1=4mrks