NIOS Class 12 Home Science Chapter 30 Maintenance of Primes

NIOS Class 12 Home Science Chapter 30 Maintenance of Primes Solutions to each chapter is provided in the list so that you can easily browse throughout different chapters NIOS Class 12 Home Science Chapter 30 Maintenance of Primes and select need one. NIOS Class 12 Home Science Chapter 30 Maintenance of Primes Question Answers Download PDF. NIOS Study Material of Class 12 Home Science Notes Paper 321.

NIOS Class 12 Home Science Chapter 30 Maintenance of Primes

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Also, you can read the NIOS book online in these sections Solutions by Expert Teachers as per National Institute of Open Schooling (NIOS) Book guidelines. These solutions are part of NIOS All Subject Solutions. Here we have given NIOS Class 12 Home Science Chapter 30 Maintenance of Primes, NIOS Senior Secondary Course Home Science Solutions for All Chapter, You can practice these here.

Maintenance of Primes

Chapter: 30




Q. 1. Radha is confused. Help her match the agents (given in column I) used to clean the following surfaces (given in column II).

Column IColumn II
(a) grease stains on glass(i) linseed oil
(b) water marks on wood(ii) kerosene oil
(c) linoleum(iii) soda and boiling water
(d) stubborn stains on plastic(iv) ammonia
(e) tea stains on silver(v) alkali
(vi) mild detergent


Column IColumn II
(a) grease stains on glass(iv) ammonia
(b) water marks on wood(i) linseed oil
(c) linoleum(vi) mild detergent
(d) stubborn stains on plastic(ii) kerosene oil
(e) tea stains on silver(iii) soda and boiling water

Q. 2. Sheela has the following problems in her house. Suggest ways to clean them.

(i) Dirt stains on wall. 

Ans: Wash with warm water and detergent with sponge from top to bottom. Rinse with clean water.

(ii) Turmeric stains on marble slab.

Ans: Clean with hot water and detergent. Rub lemon.

(iii) Grease stains on wallpaper. 

Ans: Apply any grease absorber (talcum powder, bran, etc.) brush off after a while.

(iv) Water marks on ceramic tiles.

Ans: Water and detergent, if needed along with sandpaper or mild acid. Rinse immediately.

(v) Heat marks on laminated table.

Ans: Rub a little metal polish. Wash with mild detergent.


Q. 1. Geeta finds following faults in her gadgets. Help her to identify the exact causes.

(a) Electricity fuse.

Ans: Wire in cut-out melts on passing heavy current.

(b) Noisy fan.

Ans: Bearings worm out.

(c) Fan rotates at extra speed.

Ans: Capacitor needs to be changed.

(d) Leaking tap.

Ans: Washer needs to be replaced.

(e) Ball valve in cistern does not rise with water level and water overflows.

Ans: Ball valve may have corroded/  punctured.


Q. 1. Give suggestions to maintain the following at home.

(a) Carpets.

Ans: Carpets: Carpet cleaning is a necessary process for cleaning the dust and debris from carpeting. There are many options available. Dealing with carpet stains is often the most challenging part of keeping your carpet clean. You need to effectively remove dust, dander and pollen from the carpeting. Vacuuming is a good first step, but deep cleaning and shampooing are also necessary on occasion.

(b) Wooden surface.

Ans: Wooden surface: The most basic guideline for furniture maintenance is very simple; before cleaning wood, decide whether the surface is stable enough to use a cleaning or polishing agent, the cleaning agent can damage some surfaces.

1. Wooden furniture should be cleaned only when there is a build up of wax or dirt. 

2. Unfinished wood, painted wood and wood with sturdy finish should be cleaned regularly.

3. dust can be easily removed with lint-free cloth by gently wipe the surface of the furniture with this cloth. Dust can be removed by wiping with a damp cloth. Dust can scratch the surface therefore work carefully. To dust carved surfaces use a soft natural bristle brush. Do not use a feather duster, as it will scratch the surface.

4. Wax, oil and other dirt, that has built up on the furniture can be removed by using mineral spirit, naphtha or paint thinner. You will have to find out which solvent removes the dirt. For this, dip cotton ball in the solvent and apply on a small area of the furniture that is not visible to the eye. If there is no damage to the surface then you can use the solvent. Use diluted solvent.

(c) Brass.

Ans: Brass: True brass is an alloy of copper and zinc. It tends to oxidise (tarnish) quickly when exposed to air, which is a major reason why most brass is given a clear coating of lacquer to prevent this condition. Polishes such as “Brasso,” etc. coat the raw metal with a thin film of oil and prevents future tarnishing. Additionally, most metal polishes contain solvents and detergents to remove the tarnish, mild abrasives to polish the metal, and oils to act as a barrier between the raw metal and air.

(d) Glass window.

Ans: Glass window: In cleaning glass windows to remove soil and grease use an alkali, such as ammonia or baking soda or washing soda. To remove hard water deposits and some soils, use a weak acid such as vinegar (a strong acid would etch the glass). Never combine an acid and an alkali to clean glass.

(e) Cane chair.

Ans: Cane chair: Maintenance of your cane furniture is fairly easy. You can just wipe it with a dry cloth to keep it in the best condition. Only use a slightly damp cloth to remove spillages. If your furniture is really dirty you can easily wash it, but make sure you dry your furniture properly.

(f) Coir flooring.

Ans: Coir flooring: Coir is a wonderful choice for matting; a waterproof backing allows it to deal with dusty, muddy or wet foot traffic without damage. The mat can easily be cleaned with a shaking or beating later. Maintenance of coir matting is easy, just vacuum regularly with a suction-brush attachment after shaking off large clumps of soil. Vacuum even when the mat does not look dirty daily is not too often. That’s because regular vacuuming pulls out invisible dirt and extends the life of the matting; it also helps it look better and keeps stains from forming.

One thing that can happen to your coir matting if you use it in a high traffic area is a curled edge. Fortunately, for even the highest traffic locations, this is easy to fix. Just dampen the part of your matting that has curled, and then weigh it down over night. Severely curled mats may need this treatment more than once to become flat enough.

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