Electricity — Science STD 10 — Question

How has the traditional use of energy of flowing water been modified for our convenience?

A student noticed that an organism by mistake was cut into parts. After some time, both developed into new individuals.

1. Name the mode of reproduction followed by the organism.
2. Give an example or organism which multiply by this process.

Why is the folding up of the leaves of a sensitive plant on touching with a finger not a tropism?

In the following set of elements, one element does not belong to the set. Select this element and state why it does not belong:
Oxygen, Nitrogen, Carbon, Chlorine, Fluorine.

Write some of the important uses of electromagnets.

What is observed when a solution of sodium sulphate is added to a solution of barium chloride taken in a test tube? Write equation for the chemical reaction involved and name the type of reaction in this case.

Draw ray diagrams showing the image formation by a convex lens when an object is placed:
At the focus of the lens.

List two reasons to show that the existence of decomposers is essential in an ecosystem.

Explain why, graphite can be used as a lubricant but diamond cannot.

An object is placed at a distance of 15 cm. from a convex lens of focal length 20 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.