Samacheer Kalvi 7th Science Term 3 Unit 4 Solutions

Samacheer Kalvi 7th Science Term 3 Unit 4 Book Back Question and Answers/Solutions:

Samacheer Kalvi Class 7th Std Science Book Back 1 Mark and 2 Mark Question & Answers PDF uploaded and available below. Class 7th Standard New Syllabus 2022 to 2023 Book Back Question & Answer solutions available for both English and Tamil Medium. Class 7 New Science Book Term 3 Unit 4 – Chemistry in Daily Life Answers/Solutions Guide are provided on this page. 7th Std Science Book is of 1st Term consists of 7 units, 2nd and 3rd Term consists of 6 units. All Units/Chapters of Term 1st, 2nd, 3rd Science Book Back One, and Two Mark Solutions are given below.

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Samacheer Kalvi 7th Science Book Back Chapter 3 Term 3 Answers/Solutions Guide PDF:

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7th Science – Term 3 Chapter 4

Chemistry in Daily Life


I. Choose the correct answers :

1. A drug effective in the treatment of pneumonia, and bronchitis, is ______
(a) Streptomycin
(b) Chloramphenicol
(c) Penicillin
(d) Sulphaguanidine
Answer: (c) Penicillin

2. Aspirin is ______
(a) Antibiotic
(b) Antipyretic
(c) Sedative
(d) Psychedelic
Answer: (b) Antipyretic

3. ______ are that neutralize stomach acid.
(a) Antacid
(b) Antipyretic
(c) Analgesic
(d) Antihistanics
Answer: (a) Antacid

4. The lowest temperature at which a substance catch the fire is called its ______
(a) Boiling point
(b) Melting point
(c) Critical temperature
(d) Ignition temperature
Answer: (d) Ignition temperature

5. Which is the hottest part in the flame of candle ______
(a) Blue
(b) Yellow
(c) Black
(d) Way part
Answer: (a) Blue

II. Fill in the blanks :

  1. Penicillin was first discovered by ______
  2. World ORS Day is ______
  3. Combustion is a chemical reaction in which and substance react with ______
  4. In the presence of water, the ignition temperature of paper is ______
  5. Fire produced by oil cannot be controlled by ______


  1. Alexander Fleming
  2. July 29
  3. oxidizing agent
  4. not reached
  5. water

III. True or False – If False, give the correct answer :

1. Antibiotics does work for viruses like cold and
Answer: (False)
Correct statement: Antibiotics does not work for viruses like cold and flu

2. Analgesics are the substances that lower the temperature during fever.
Answer: (False)
Correct statement : Antipyretic are the substances that lower the temperature during fever.

3. All fuels form flame.
Answer: (False)
Correct statement: All fuels do not form flame.

4. Oxygen is necessary for combustion.
Answer: True

5. Burning wood and coal causes pollution of air.
Answer: True

IV. Match the following :

Question 1.

1. Antipyretic Reduce pain
2. Analgesic Reduce body temperature
3. Antacid Spontaneous combustion
4. Phosphorus ORS Solution
5. Carbon – di – oxide Leads to respiratory problem


1. Antipyretic Reduce body temperature
2. Analgesic Reduce pain
3. Antacid ORS Solution
4. Phosphorus Spontaneous combustion
5. Carbon – di – oxide Leads to respiratory problem.

V. Analogy:

1. Inner zone of flame:: ______, outer zone of flame : : ________
Anwer: Black, Blue

2. Tincture:: ______, Histamine : : _______
Answer: Antiseptic, Chemical messenger

VI. Very short answer :

1. First viral disease detected in human being was : _____ (Yellow fever / dengue fever)
Answer: Yellow fever.

2. ______,:_______,:_______ are called green house gases
Answer: CO, Methane, Chlorofluorocarbons

3. Name a substance which can be used as an antiseptic as well as disinfectant.
Garlic, Turmeric, Aloe vera.

4. What are the main constituents of dettol?
Mixture of chloroxylenol and terpincol

5. Name the unit in which the calorific value of a fuel is expressed.

6. How many types of combustion are there?

  1. Rapid combustion
  2. Spontaneous combustion
  3. Explosion

7. What are the essential requirements for producing fire?
Answer: Fuel, Heat and Oxygen.

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