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Explain the Secondary sex characteristics of Boys.
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Explain the Secondary sex characteristics of Girls.
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Differentiate Afforestation and Reforestation.
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Explain the significance of Afforestation.
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Match the following:
| A. | Granite | 1. | Bed rock |
| B. | Soil layer | 2. | Plutonic rock |
| C. | Barren island | 3. | Strip farming |
| D. | Soil conservation | 4. | Active Volcano |
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Which one the following system of units is the British System of unit?
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Name two instruments, which help to measure the pressure of a fluid.
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Why are heavy bags provided with broad straps?
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The imaginary line passing through the centre of curvature and pole of a spherical mirror is called
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If the image and object distance is same, then the object is placed at
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Numerical problem.
If two plane mirrors are inclined to each other at an angle of 45°, find the number of images formed.
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Identify the state of matter based on the arrangement of the molecules.
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A chemical reaction is a temporary reaction.
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Match the following.
| Spoilage | Decomposition |
| Ozone | Biocatalyst |
| Tarnishing | Oxygen |
| Yeast | Chemical reaction |
| Calcium oxide | Food |
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What happens when an iron nail is placed in copper sulphate solution?
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What is tarnishing? Give an example.
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Explain how food items are spoiled by chemical reactions?
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