Question

FORMB
Q1.Write the chemical formula of Sodium oxide. (1)
Q2.A boy walks to his school with a constant speed of 4km/h and reaches
there in 15 minutes.Calculate the distance covered by the boy in 15 minutes. (2)
Q3. Give reasons for the following
a)All alkalis are bases but all bases are not alkalis.
b) Tea or coffee pots are often made shining bright.
c)Bacteria are present in caecum of ruminants
(3)
Q4(a) Draw a neat well labelled diagram of the human respiratory system.
(b) Describe the changes that take place around the rib cage and diaphragm
during inspiration.State the effect of these changes.
(2+2)​

Answer 1

Answer:

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Explanation:

vhhbbvvvvvvvvv