Everyday Science » Exercise – 1
1. Which of the following is used in pencils ?
(a) Graphite
(b) Silicon
(c) Charcoal
(d) Phosphorous
2. The chemical (ethyl merceptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of :
(a) bromine
(b) fluorine
(c) chlorine
(d) sulphur
3. Non stick cooking utensils are coated with :
(a) Teflon
(b) PVC
(c) black paint
(d) polystyrene
4. The filament of an electric bulb is made of :
(a) tungsten
(b) nichrome
(c) graphite
(d) None of these
5. Potassium Permanganate is used for purifying drinking water, because :
(a) it is a sterilising agent
(b) it dissolves the impurities of water
(c) it is a reducing agent
(d) it is an oxidising agent
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Everyday Science » Exercise - 1 2. The chemical (ethyl merceptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of : (a) bromine (b) fluorine (c) chlorine (d) sulphur- Everyday Science » Exercise - 1 5. Potassium Permanganate is used for purifying drinking water, because : (a) it is a sterilising agent (b) it dissolves the impurities of water (c) it is a reducing agent (d) it is an oxidising agent
- Everyday Science » Exercise - 1 1. Which of the following is used in pencils ? (a) Graphite (b) Silicon (c) Charcoal (d) Phosphorous
- Everyday Science » Exercise - 1 4. The filament of an electric bulb is made of : (a) tungsten (b) nichrome (c) graphite (d) None of these
- Everyday Science » Exercise - 1 3. Non stick cooking utensils are coated with : (a) Teflon (b) PVC (c) black paint (d) polystyrene