Friction — Science STD 8 — Question

State whether the following statements are True or False:
Each sperm is a single cell.

Give two examples of Rabi crop.

State the age at which adolescence usually begins and the age up to which it lasts.

A purple coloured non-metal forms a brown solution in alcohol which is applied on wounds as an antiseptic. Name the nonmetal.

How much is the volume difference indicated between the two bigger marks (for example, between 10 mL and 20 mL)?

The underlined words in the following sentence have been jumbled up. Write them in their correct form. Nutsgilh is an example of inexhaustible natural resources.

Out of the three-a blosphere reserve, a National park or a wildlife sanctuary, which is the largest ?

Fill in the following blanks with suitable words: The cow is a ______________ animal whereas ostrich is an ______________ animal.

What does the working of a toy telephone tell us about sound?

On what factor does the pitch of a sound depend?