Acids, Bases and Salts — Science STD 10 — Question

Describe the nature of image formed when the object is placed at a distance of 20cm from a concave mirror of focal length 10cm.

State two disadvantages of geothermal energy.

List four advantages of properly managed watershed management.

Explain how, harmful ultraviolet radiations of sunlight are prevented from reaching the earth’s surface.

Suggest any two ways by which the balance between the environment and industrial development is maintained so as to help undisturbed survival of the organisms on the Earth.

Name one metal and one non-metal that exist in liquid state at room temperature. Also name two metals having melting point less than 310K (37°C).

Define:

1. Principal focus of a concave mirror.
2. Focal length of a concave mirror.

What will happen if a solution of sodium hydrocarbonate is heated? Give the equation of the reaction involved.

How can we predict about the strength of a magnetic field in a space?

Draw a ray diagram showing how a concave mirror can be used to produce a real, inverted and diminished image of an object.