2nd Year Chemistry 4th Quarter Book Paper

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

1. Which two gases primarily cause acid rain when released into the atmosphere?

   1. Carbon dioxide and Oxygen

   2. Sulphur oxides and Nitrogen oxides

   3. Hydrogen and Helium

   4. Ammonia and Methane

2. Which level of water treatment is specifically responsible for the removal of physical debris?

   1. Primary treatment

   2. Secondary treatment

   3. Tertiary treatment

   4. Advanced treatment

3. Opiates trigger a neurochemical reaction specifically in which functional center of the brain?

   1. Auditory center

   2. Visual cortex

   3. Reward center

   4. Cerebellum coordination center

4. During eutrophication, what is the direct physical consequence of the rapid growth of algae?

   1. It warms the water currents

   2. It blocks sunlight and reduces oxygen levels in the water

   3. It introduces toxic heavy metal salts

   4. It speeds up the natural water cycle

5. Limestone is highly abundant in Sindh and the Salt Range, providing a source of:

   1. Sodium chloride

   2. Calcium carbonate for cement

   3. Pure elemental sulphur

   4. Methane gas

6. What are the major sources of pesticides and herbicides polluting water systems?

   1. Industrial chimneys and mining

   2. Agricultural runoff and domestic gardening

   3. Hospital waste and urban sewage

   4. Electrical transformers only

7. What is the typical pH range of the highly acidic environment inside the stomach?

   1. 0.5–1.0

   2. 1.5–3.5

   3. 4.0–6.0

   4. 7.3–7.4

8. The formation of hydrogen bonds among water molecules is a direct result of what feature?

   1. High density

   2. Neutral pH

   3. Polarity of the water molecule

   4. High heat of vapourisation

9. What does the acronym PPE stand for in workplace safety guidelines?

   1. Primary Physical Elements

   2. Personal Protective Equipment

   3. Pipeline Protection Engineering

   4. Permanent Partial Exposure

10. Continuous water quality monitoring is crucial because it directly enables:

    1. Reduction of water usage charges

    2. Expansion of industrial land area

    3. Elimination of natural organic matter

    4. None of these

11. Which of the following groups contains only primary macronutrients needed in large quantities?

    1. Boron, Iron, and Nickel

    2. Nitrogen, Phosphorus, and Potassium

    3. Carbon, Hydrogen, and Oxygen

    4. Calcium, Magnesium, and Sulphur

12. Into how many types are the sources of water pollution divided?

    1. One

    2. Two

    3. Three

    4. Four