Applied Chemistry Book Back Questions 9th Science Lesson 16

9th Science Lesson 16

16] Applied Chemistry

Book Back Questions with Answer and Do You Know Box Content

Do You Know?

Uranium in the ground can decay into radon gas which can be dangerous to humans. It is thought to be the second leading isotope to cause lung cancer.

40% of today’s global population works in agriculture, making it the single largest employment in the world.

Choose the best answers:

1. One Nanometre is

(a) 10^-7 metre

(b) 10^-8 metre

(c) 10^-6 metre

(d) 10^-9 metre

2. The antibiotic Pencillin 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 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

7. This type of food protect us from deficiency diseases.

(a) Carbohydrates

(b) Vitamins

(c) Proteins

(d) Fats

8. Radio chemistry deals with

(a) Oxidants

(b) Batteries

(c) Isotopes

(d) Nano-particles

9. The group 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

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. ___________, ____________ and _____________ are macronutrients required for plant growth.

5. __________ is a chemical used in finger print analysis.

Match the following:

1. Antipyretics – large surface area

2. Corrosion prevention – Iodine – 131

3. Hyperthyroidism – fever

4. Nanoparticle – body building

5. Proteins – electroplating

Answers:

Choose the best answers:

1. 10^-9 metre 2. Microorganism 3. Antiseptic 4. Reduction 5. Carbon 6. Potato 7. Vitamins 8. isotopes 9. Chromophore 10. Pesticides

Fill in the blanks:

1. Electrolytic cell 2. Analgesic 3. Analgesics 4. Nitrogen, Phosphorous, Potassium 5. Ninhydrin

Match the following:

1.Antipyretics – Fever

2.Corrosion prevention – Electroplating

3.Hyperthyroidism- Iodine- 131

4.Nanoparticle- large surface area

5.Proteins- Cancer cell identification