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7th Class Science Soil Question Bank Soil

  • question_answer
    DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 2 Weigh 100g of soil and place it on a newspaper in the sun to dry for about 2 hours. Do not allow any soil to spill from the newspaper. After drying it, weigh the soil and let the weight of soil (dry) is x g. What is the % age of moisture in this sample of soil?

    A) x%                              

    B) (100-x)%

    C)  \[\frac{100}{x}%\]                

    D)  \[\frac{x}{100}%\]

    Correct Answer: B

    Solution :

    Percentage of moisture in soil             \[=\frac{\text{weight of moisture}}{\text{original weight of soil}}\times 100\]             \[=\frac{(100-x)}{100}\times 100\]or \[(100-x)%\]


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