12 29. Which of the following elevents her four electron shells? C (}_{15)P D. (}_{5)B Use this information to answer questions 30 to replace a 20 W bulb with a 50 W bulb. 30. The unit inscribed on the bulb measures its A. workdone. electricity. C. power. D. energy. 31. The SOW bulb is likely to 1. increase the brightness in the room. II. increase the amount of electricity consumed. III. destroy the habitat of pestx A. I and II only I and III only B. 1. II and III D. II and III only 32. Two unknown solutions labelled A and B were brought to a JHS 3 class. It was observed that in solutio red litmus paper changed colour to blue, whiles in solution B, red litmus paper retained its colour, Mr could be the content of solution A? A. Car battery fluid B. Salt solution C. Orange juice D. Baking soda 33. Which of the following nursery beds is suitable for a flood prone area? A. Flat bed B. Sunken bed C. Plain bed D. Raised bed 34. The portion of air which acts as a solvent is A. an inert gas. B. carbon (IV) oxide. C. oxygen. D. nitrogen. 35. Which of the following pairs of energy sources is environmentally friendly? A. Biogas and thermal energy B. Wind and biogas C Coal and thermal energy D. Wind and coal

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$12 29. Which of the following elevents her four electron shells? C (}_{15)P D. (}_{5)B Use this information to answer questions 30 to replace a 20 W bulb with a 50 W bulb. 30. The unit inscribed on the bulb measures its A. workdone. electricity. C. power. D. energy. 31. The SOW bulb is likely to 1. increase the brightness in the room. II. increase the amount of electricity consumed. III. destroy the habitat of pestx A. I and II only I and III only B. 1. II and III D. II and III only 32. Two unknown solutions labelled A and B were brought to a JHS 3 class. It was observed that in solutio red litmus paper changed colour to blue, whiles in solution B, red litmus paper retained its colour, Mr could be the content of solution A? A. Car battery fluid B. Salt solution C. Orange juice D. Baking soda 33. Which of the following nursery beds is suitable for a flood prone area? A. Flat bed B. Sunken bed C. Plain bed D. Raised bed 34. The portion of air which acts as a solvent is A. an inert gas. B. carbon (IV) oxide. C. oxygen. D. nitrogen. 35. Which of the following pairs of energy sources is environmentally friendly? A. Biogas and thermal energy B. Wind and biogas C Coal and thermal energy D. Wind and coal$

12 29. Which of the following elevents her four electron shells? C (}_{15)P D. (}_{5)B Use this information to answer questions 30 to replace a 20 W bulb with a 50 W bulb. 30. The unit inscribed on the bulb measures its A. workdone. electricity. C. power. D. energy. 31. The SOW bulb is likely to 1. increase the brightness in the room. II. increase the amount of electricity consumed. III. destroy the habitat of pestx A. I and II only I and III only B. 1. II and III D. II and III only 32. Two unknown solutions labelled A and B were brought to a JHS 3 class. It was observed that in solutio red litmus paper changed colour to blue, whiles in solution B, red litmus paper retained its colour, Mr could be the content of solution A? A. Car battery fluid B. Salt solution C. Orange juice D. Baking soda 33. Which of the following nursery beds is suitable for a flood prone area? A. Flat bed B. Sunken bed C. Plain bed D. Raised bed 34. The portion of air which acts as a solvent is A. an inert gas. B. carbon (IV) oxide. C. oxygen. D. nitrogen. 35. Which of the following pairs of energy sources is environmentally friendly? A. Biogas and thermal energy B. Wind and biogas C Coal and thermal energy D. Wind and coal

Answer 1

### 29) A. $\mathrm{K}$ ### 30) C. power ### 31) A. I and II only ### 32) D. Baking soda ### 33) D. Raised bed ### 34) D. nitrogen ### 35) B. Wind and biogas

Answer 2

## Step 1: Identify the element with four electron shells ### Elements with four electron shells are in the fourth period of the periodic table. Potassium (K) is in the fourth period. ## Step 2: Determine the unit inscribed on the bulb ### The unit inscribed on the bulb measures power, which is the rate at which energy is used. ## Step 3: Analyze the effects of a 50 W bulb ### A 50 W bulb will increase brightness and electricity consumption. ## Step 4: Identify the content of solution A ### Solution A turns red litmus paper blue, indicating it is a base. Baking soda is a base. ## Step 5: Choose a suitable nursery bed for a flood-prone area ### A raised bed is suitable for flood-prone areas as it prevents waterlogging. ## Step 6: Determine the portion of air acting as a solvent ### Nitrogen is the major component of air and acts as a solvent. ## Step 7: Identify environmentally friendly energy sources ### Wind and biogas are environmentally friendly energy sources.

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