21. Which one of the following statement is correct?
22. Middle region of flame having the colour.
23. Which of the following is used as a "morning after pill"?
24. Gasohol is a mixture of
25. The substances which vaporise during burning give
26. Consider the following statements.
Sodium silicate and sodium sulphate are mixed as detergents in washing powders so that
1. to maintain dryness of the powder.
2. to maintain the basicity of powder.
Which of the following statements is correct?
Sodium silicate and sodium sulphate are mixed as detergents in washing powders so that
1. to maintain dryness of the powder.
2. to maintain the basicity of powder.
Which of the following statements is correct?
27. Which one of the following is not a natural fibre?
28. Consider the following statements.
1. Fuels with low octane numbers are ideal for diesel engines.
2. Use of gasoline with low octane numbers may lead to the problem of engine knocking.
Which of the statement(s) given above is/are correct?
1. Fuels with low octane numbers are ideal for diesel engines.
2. Use of gasoline with low octane numbers may lead to the problem of engine knocking.
Which of the statement(s) given above is/are correct?
29. Match the following List I with List II.
List-I
List-II
a. NO
1. Insecticide
b. PAN
2. Primary pollutant
c. BHC
3. Herbicide
d. NaClO3
4. Secondary pollutant
| List-I | List-II |
| a. NO | 1. Insecticide |
| b. PAN | 2. Primary pollutant |
| c. BHC | 3. Herbicide |
| d. NaClO3 | 4. Secondary pollutant |
30. Soap helps in better cleaning of clothes because
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