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Applied Chemistry
Samacheer Book Back Questions And Answers For Science Standard 9 “Applied Chemistry“
I. Choose the correct answer:
1. One Nanometre is
(a) 10-7 metre
(b) 10-8 metre
(c) 10-6 metre
(d) 10-9 metre
2. The antibiotic Penicillin is obtained from _____.
(a) plant
(b) microorganism
(c) animal
(d) sunlight
3. 1% solution of Iodoform is used as
(a) antipyretic
(b) antimalarial
(c) antiseptic
(d) antacid
4. The cathode of an electrochemical reaction involves _____.
(a) oxidation
(b) reduction
(c) neutralisation
(d) catenation
5. The age of a dead animal can be determined by using an isotope of _____.
(a) carbon
(b) iodine
(c) phosphorous
(d) oxygen
6. Which of the following does not contain natural dyes?
(a) Potato
(b) Beetroot
(c) Carrot
(d) Turmeric
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7. This type of food protect us from deficiency diseases.
(a) Carbohydrates
(b) Vitamins
(c) Proteins
(d) Fats
8. Radiochemistry deals with
(a) oxidants
(b) batteries
(c) isotopes
(d) nanoparticles
9. The groups responsible for the colour of an organic compound is called
(a) isotopes
(b) auxochrome
(c) chromogen
(d) chromophore
10. Chlorinated hydrocarbons are used as
(a) fertilizers
(b) pesticides
(c) food colourants
(d) preservatives
II. Fill in the blanks:
1. _____ is an electrochemical cell which converts electrical energy into chemical change (Reaction).
2. Painkiller drugs are called _____.
3. Indigo is a _____ dye.
4. _____, _____ & _____ are macro nutrients required for plant growth.
5. _____ is a chemical used in fingerprint analysis.
Answers:
1. Electrolytic cell
2. Analgesics
3. Vat
4. Nitrogen, Phosphorous and Potassium
5. Ninhydrin
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III. Match the following:
1. Antipyretics A. Large surface area
2. Corrosion prevention B. Iodine-131
3. Hyperthyroidism C. Fever
4. Nanoparticle D. Body building
5. Proteins E. Electroplating
Answers:
1. C
2. E
3. B
4. A
5. D
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