Samacheer Kalvi 7th Science Term 3 Unit 4 Book Back Questions and Answers:
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Samacheer Kalvi 7th Science Book Back Chapter 4 Term 3 Solutions Guide PDF:
TN State Board Class 7th Science Subject Term 3 Unit 4 one mark and two mark solutions guide PDF available below.
Science – Term 3
Unit 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 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 a candle ______
(a) Blue
(b) Yellow
(c) Black
(d) Way part
Answer: (a) Blue
II. Fill in the blanks:
- Penicillin was first discovered by ______
- World ORS Day is ______
- Combustion is a chemical reaction in which and substance react with ______
- In the presence of water, the ignition temperature of paper is ______
- The fire produced by oil cannot be controlled by ______
Answer:
- Alexander Fleming
- July 29
- oxidizing agent
- not reached
- 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 do not work for viruses like cold and flu
2. Analgesics are substances that lower the temperature during a fever.
Answer: (False)
Correct statement: Antipyretics are substances that lower the temperature during a fever.
3. All fuels form a flame.
Answer: (False)
Correct statement: All fuels do not form a flame.
4. Oxygen is necessary for combustion.
Answer: True
5. Burning wood and coal causes the 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 – dioxide | This 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 problems. |
V. Analogy:
1. Inner zone of flame:: ______, outer zone of flame : : ________
Answer: Black, Blue
2. Tincture:: ______, Histamine : : _______
Answer: Antiseptic, Chemical messenger
VI. Very short answer :
1. First viral disease detected in human beings was: _____ (Yellow fever/dengue fever)
Answer: Yellow fever.
2. ______,:_______,:_______ are called greenhouse gases
Answer: CO2 , Methane, Chlorofluorocarbons
3. Name a substance that can be used as an antiseptic as well as a disinfectant.
Answer:
Garlic, Turmeric, Aloe vera.
4. What are the main constituents of Dettol?
Answer:
A mixture of chloroxylenol and terpineol
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:
- Rapid combustion
- Spontaneous combustion
- Explosion
7. What are the essential requirements for producing fire?
Answer: Fuel, Heat, and Oxygen.
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