Mary, while examining whether a boiled egg sinks or floats, found that it floats.But Vakula made it sink. How is it possible ? Guess and write it.

An iron nall sinks in water. While a large ship floats on the surface of water. Give reason.

Iron sinks in water, wood floats in water. If we tie an iron piece to the same volume of wood piece, and dropped it water, would it sink or float ? Make a guess and find out whether yours gucess is correct or wrong with an experiment. Give reasins.

How can you appreciate the technology of making ships float, using the material which sink in water ?

Place a fist full of Bengal gram (or any other seeds) seeds in a bowl of water. Do you find some seeds float while others sink? Which seeds do you think will not germinate and why?

A piece of wax floats in water but the same piece of wax sinks in a liquid say liquid 'X'. Will the relative density of liquid. 'X' be less than 1 or greater than 1 ? How can you say ?

We know that a ship, even though it is made up of tonnes of iron, floats on water. How do you feel about the scientists who found the scientific principles and efforts in making a ship?

Place a fist full of Bengal gram (or any other seeds) seeds in a bowl of water. Do you find some seeds float while others sink? Which seeds do you think farmers should use for sowing in the field.

Given are some materials. Predict them whether they float or sink. write your findings. Tomato, Brinjal, Potato, Iron nail, Sponge, Wood, Stone, leaf , Piece of chalk.