P-2 Towards Green Energy — Science STD 10 — Question

Identify the type of disaster: Hepatitis.

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 : Gangue

Why is there a change in the direction of propagation of light when it passes obliquely from one transparent medium to another?

Name any two factors on which the strength of magnetic field produced by a current-carrying solenoid depends. How does it depend on these factors?

The gravitational force due to the earth also acts on the moon because of which it revolves around the earth. Similar situation exists for the artificial satellites orbiting the earth. The moon and the artificial satellites orbit the earth. The earth attracts them towards itself but unlike the falling apple, they do not fall on the earth, why?

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

Give one example each of the compounds having the following functional groups:

1. Aldehyde group.
2. Alcohol group.
3. Carboxylic acid group.
4. Halo group.

What happens when ethanoic acid is treated with sodium hydroxide? Write the balanced equation for the same.

Silver ornaments or idols exposed to air for a long time.