Central Board Of Secondary Education – ( CBSE )
Class – 7
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Recommended Question & Answers for Class 7
1.Find the breadth of a rectangular plot of land, if its area is 440 m2 and the length is 22 m. Also, find its perimeter ?
Given: Area = 440 m2
Length = 22 m
Breadth = Area Length =440m222m=20m
Perimeter = 2[l + b] = 2 [22 m + 20 m]
= 2 × 42 m = 84 m
2. Why do we often sneeze when we inhale a lot of dust-laden air?
We often sneeze when we inhale a lot of dust-laden air to expel out these foreign particles. These particles get past the hair in the nasal cavity and irritate the lining of the cavity which results in sneezing.
3. Is the distilled water acidic/basic/neutral? How would you verify it?
Distilled water will be neutral. We can verify it by showing that neither blue nor red litmus paper changes its color when dipped in it.