5.સ્વાધ્યાય જવાબો – Playing with Fire

🙋 સ્વાધ્યાય જવાબો –
Playing with Fire

Q1. What does the word ‘Pyr’ mean?

A. The word ‘Pyr’ means Fire.

Q2. Why is the household match considered a special pyrotechnic device?

A. Because all pyrotechnic effects—heat, smoke, light, gas, and sound—are present in it.

Q3. Why did Roger Bacon write the formula in a code language?

A. Because he considered ‘black powder’ a dangerous substance.

Q4. What is the basic formula of ‘black powder’?

A. Potassium nitrate, charcoal, and sulphur in the ratio 75:15:10 by weight.

Q5. What is the principle behind any firework?

A. When heat is applied to fuel (gunpowder), it burns using oxygen.

Q6. Why do fire accidents take place in Sivakashi?

A. Because there are hardly any safety measures in force there.

Q7. Why are only a few reliable persons taught the art of manufacturing fireworks?

A. Because it is not considered safe to give everyone the details.

Q8. Which are the different pyrotechnic effects in the match?

A. Heat, smoke, light, gas, and sound.

Q9. Describe the development of black powder in India.

A. Some historians say it was invented in India. Shukranti has references to ancient projectile weapons like guns.

Q10. Who introduced black powder in the west? What was his opinion?

A. Roger Bacon, an English monk. He considered it dangerous and wrote about it in code language.

Q11. How have light and colour effects improved?

A. Aluminium, magnesium, and titanium burn at high temperatures and emit bright light, enhancing colour effects.

Q12. How is incandescent light produced?

A. It is produced when a substance is heated so much that it begins to glow.

Q13. What are the dangers of pyrotechnics?

A. The mixture is stable when cool and dry but may ignite due to heat, friction, spark, or impact.

Q14. Describe fireworks production in Sivakashi.

A. Fireworks are made in small units 3 months before Diwali and sent across India. But there are few quality checks or safety measures.