Sound — Science STD 8 — Question

State whether the following statements are True or False:
An embryo is made up of a single cell.

Which of the two has a lower ignition temperature: petrol or kerosene?

A nine-year-old boy is 120 cm tall. If the present height of boy is 75% of his full height, calculate the full height which the boy will eventually reach at the end of growth period.

When a plastic pen is rubbed in dry hair, it attracts tiny pieces of paper. Which force is involved in this process?

Write the full name of IRS.

What name is given to that part of the earth in which living organism exist (or which supports life)?

Define the calorific value of a fuel.

What is formed when two gametes involved?

How is sound produced?

What substance present in our body balances the atmospheric pressure acting on us?