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Read the following statements. 1. Wat...

Read the following statements.
1. Water is the best extinguisher for fires involving inflammable materials
2. Carbon dioxide is used to extinguish fires involving oil and petrol
3. Water is not suitable for fires involving electrical equipments.
4. Fires caused by short-circuit should be immediately put off by sprinkling water on it.
Which alternative has the correct statements

A

2 and 3

B

3 and 4

C

1 and 2

D

2 and 4

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statements are correct regarding fire extinguishing methods, let's analyze each statement step by step. ### Step 1: Evaluate Statement 1 **Statement 1:** Water is the best extinguisher for fires involving inflammable materials. - **Analysis:** This statement is incorrect. Water is not suitable for extinguishing fires involving inflammable materials because these materials can catch fire very quickly. Instead, carbon dioxide (CO2) is preferred as it suffocates the fire by cutting off the oxygen supply. ### Step 2: Evaluate Statement 2 **Statement 2:** Carbon dioxide is used to extinguish fires involving oil and petrol. - **Analysis:** This statement is correct. CO2 is effective for extinguishing fires caused by oil and petrol because it forms a blanket over the fire, cutting off the oxygen and extinguishing the flames. ### Step 3: Evaluate Statement 3 **Statement 3:** Water is not suitable for fires involving electrical equipment. - **Analysis:** This statement is correct. Water is a good conductor of electricity, and using it on electrical fires can lead to electric shocks. Therefore, it is not safe to use water for such fires. ### Step 4: Evaluate Statement 4 **Statement 4:** Fires caused by short-circuit should be immediately put off by sprinkling water on it. - **Analysis:** This statement is incorrect. Sprinkling water on a fire caused by a short circuit is dangerous because it can lead to electric shocks. Therefore, this method is not advisable. ### Conclusion: - **Correct Statements:** - Statement 2 (Carbon dioxide is used to extinguish fires involving oil and petrol) is correct. - Statement 3 (Water is not suitable for fires involving electrical equipment) is also correct. - **Incorrect Statements:** - Statement 1 and Statement 4 are incorrect. ### Final Answer: The alternative with the correct statements is **Option 1**, which includes Statements 2 and 3. ---
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MTG IIT JEE FOUNDATION-COMBUSTION AND FLAME -EXERCISE (MULTIPLE CHOICE QUESTIONS) LEVEL 1
  1. Hydrogen satisfies the conditions of an ideal fuel but cannot be used ...

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  2. The hottest part of the Bunsen burner is

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  3. Read the following statements. 1. Water is the best extinguisher fo...

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  4. Flames of the mixture .......... are used for welding.

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  5. The formation of soot occurs when

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  6. The necessary conditions for combustion process to occur are 1. ava...

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  7. When you introduce a glass plate into the luminous zone of a candle fl...

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  8. Which of the following diagrams shows a non-luminous flame?

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  9. Students were carrying out an experiment in the laboratory, in which o...

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  10. What does this experiment show?

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  11. Which of the following is highly inflammable?

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  12. A spoon was kept in contact with ice cubes for some time. Later, the s...

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  13. When the matchstick strikes against the rubbing surface, what happens ...

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  14. Which statement best explains the spontaneous combustion?

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  15. State which of the following statements is false.

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  16. Identify the correct statements. (i) Carbon dioxide is used to exti...

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  17. Which of the following statements is/are correct? I. The flame of a ...

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  18. The different zones of a candle flame are marked by the letters A, B a...

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  19. The upper most part of match stick is made up of

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  20. Cheenu sets up an experiment as shown in the figure. What do you...

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