Samacheer Kalvi 7th Science Term 3 Unit 4 Solutions

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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:

7th Science Subject 1 Mark and 2 Mark Solutions Guide PDF available below. Click the Download option to download the book back 1 Mark & 2 Mark questions and answers. Take the printout and use it for exam purposes.

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 ______

Answer:

  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

Answer:

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: CO2 , Methane, Chlorofluorocarbons

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

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

5. Name the unit in which the calorific value of a fuel is expressed.
Answer:
KJ/Kg.

6. How many types of combustion are there?
Answer:

  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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