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Everyday Science – 1 – 1

1. Which of the following is used in pencils ?

(a) Graphite
(b) Silicon
(c) Charcoal
(d) Phosphorous

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

3. Non stick cooking utensils are coated with :

(a) Teflon
(b) PVC
(c) black paint
(d) polystyrene

ANSWER

EXPLANATION

4. The filament of an electric bulb is made of :

(a) tungsten
(b) nichrome
(c) graphite
(d) None of these

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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