How do Organisms Reproduce? — Science STD 10 — Question

Identify the device used as a spherical mirror or lens in following cases, when the image formed is virtual and erect in each case.Object is placed between the focus and device, image formed is enlarged and on the same side as that of the object.

At what distance from a converging lens of focal length 12cm must an object be placed in order that an image of magnification 1 will be produced?

A lens has power 4D. Find the focal length that lens.

In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?

Name the process by which an amoeba reproduces. Draw the various stages of its reproduction in a proper sequence.

State and explain the laws of refraction of light with the help of a labelled diagram.

Lithium, sodium and potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements? Explain your answer.

Define "Nutrition" Why is nutrition necessary for an organism?

What happens to the eye when you enter a darkened cinema hall from bright sunshine? Give reason for your answer.

State one practical application the use of such a lens with the object in position (i) and (ii).