9th Class Chemistry 3rd Quarter Book Paper

Q1. Multiple choice questions (Attempt all · 12 × 1 = 12)

1. Meat and fish provide:
   1. Carbohydrates
   2. Proteins
   3. Lipids
   4. Sugar
2. Which is/are responsible for acid rain?
   1. SO₂
   2. NO₂
   3. Both NO₂ and SO₂
   4. O₃
3. What is eutrophication caused by?
   1. low phosphate concentration
   2. high concentration
   3. increase water flow
   4. improved water clarity
4. Combustion of methane produces:
   1. Carbon dioxide
   2. Water
   3. Heat
   4. All of these
5. CH3–CH2–CH3 is the chemical formula for:
   1. Ethane
   2. Propane
   3. Butane
   4. Pentane
6. Which foods are rich in fats?
   1. Rice & maize
   2. Pulses & wheat
   3. Milk, egg & beans
   4. Cheese, butter & oil
7. The normal rain has pH:
   1. 5.6
   2. 6.5
   3. 4.6
   4. 4.2
8. What is a commonly application of tap water in a chemistry laboratory?
   1. preparing chemical reagents
   2. calibration of sensors
   3. cleaning glasswater
   4. measuring pH level
9. Reduction of chloromethane gives:
   1. Hydrogen
   2. Chlorine
   3. Methane
   4. All of these
10. Condensed structural formula for butane is:
    1. CH₃–CH₂–CH₃
    2. CH₃–CH₂–CH₂–CH₃
    3. CH₃–CH₂–CH₂–CH₂–CH₃
    4. CH₃–CH₃
11. Disorder NOT caused by protein deficiency:
    1. Weight loss
    2. Muscle fatigue
    3. Loss of strength
    4. Constipation
12. What air pollution is released by forest fires and storms?
    1. Smoke
    2. Ash
    3. Methane
    4. Nitrogen oxides