P-1 Chemical reactions and equations — Science STD 10 — Question

What is the relation between the focal length and radius of curvature of a spherical mirror (concave mirror or convex mirror)? Calculate the focal length of a spherical mirror whose radius of curvature is 25cm.

Define : Lens

Find the heat produced in joule if a current of 0.1 A is passed through a coil of resistance 25 Ω for one minute.

What type of oxides are formed when non-metals react with oxygen? Explain with an example.

Hydrogen is not a metal but still it has been assigned a place in the reactivity series of metals. Why?

How can the wastes such as paper, plastic and metal objects be disposed of?

Write names and formulae of hydrocarbons containing a single and a double bond (one example for each). Give one characteristic chemical property of each.

Read the following extract and answer the questions that follow:
A liberal view behind the concept of organ and body donation is that after death our body should be useful to other needful persons so that their miserable life would become comfortable. Awareness about these concepts is increasing in our country and people are voluntarily donating their bodies.
Life of many people can be saved by organ and body donation. Blinds can regain their vision. Life of many people can be rendered comfortable by donation of organs like liver, kidneys, heart, heart valves, skin, etc. Similarly, body can be made available for research in medical studies. Many government and social organizations are working towards increasing the awareness about body donation.
i. What is the liberal view behind the organ and body donation?
ii. Name any four organs that can be donated.