Exploring the Investigative World of Science — Science STD 8 — Question

Fill in the blanks. Microorganisms can be seen with the help of a _________.

In a mixture of sawdust or sand in water, which mixture is called a solution? In which case, the so-added substance will float or sink?

Fruits detached from a tree fall down due to force of gravity. We know that a force arises due to interaction between two objects. Name the objects interacting in this case.

Light travels fastest in vacuum. Why?

Name the smallest unit of life.

If an object is touched with the metal top of an electroscope its aluminium leaves diverge, then what conclusion do we get from this observation?

What causes antibiotic resistance?

Give a suitable word for each of the following statements. Chemicals which control changes at adolescence stage.

State the puberty age in human females.

How does a sound making object differ from one that is silent?