Subject :NSO Class : Class 7
Subject :NSO Class : Class 6
The length of a pencil is measured using a ruler as shown in the given figure. What is the apparent length of the pencil seen by the observer and the actual length of the pencil?
| Apparent length | Actual length | |
|---|---|---|
| A | 42 mm | 40 mm |
| B | 5 mm | 10 mm |
| C | 38 mm | 30 mm |
| D | 38 mm | 40 mm |
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Subject :NSO Class : Class 7
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Subject :NSO Class : Class 2
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Subject :NSO Class : Class 8
Identify the salts W, X, Y and Z from their uses.
W : Used in medicines and fire extinguishers
X : Used in purification of water
Y : Used in fireworks
Z : Used as a fungicide
| W | X | Y | Z | |
|---|---|---|---|---|
| A | Sodium carbonate |
Potash alum |
Copper sulphate |
Sodium nitrate |
| B | Potassium chloride |
Silver nitrate |
Sodium bicarbonate |
Potassium sulphate |
| C | Potassium nitrate |
Sodium carbonate |
Potash alum |
Sodium chloride |
| D | Sodium bicarbonate |
Potash alum |
Potassium nitrate |
Copper sulphate |
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Subject :NSO Class : Class 8
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Subject :NSO Class : Class 7
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Subject :NSO Class : Class 6