Cell Structure and Functions — Science STD 8 — Question

On what factor does the pitch of a sound depend?

How is heat produced in our body ?

Some grass is growing in a wheat field. What will it be known as?

Fill in the blanks with suitable words. Loudness is determined by the ________ of vibration.

What are metals and non-metals?

A chapati maker is a machine which converts balls of dough into chapati’s. What effect of force comes into play in this process?

Explain why, the soles of our shoes wear out gradually.

Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.

Can the Moon be seen during the day?

An archer stretches her bow while taking aim at the target. She then releases the arrow, which begins to move towards the target. Based on this information fill up the gaps in the following statements using the following terms. muscular, contact, non-contact, gravity, friction, shape, attraction. The type of force responsible for a change in the state of motion of the arrow is an example of a _______ force.