The power of a lens is -5D.

1. Find its focal length.
2. Name the type of lens.

Explain why it is preferable to use a number of graphite electrodes as anode instead of a single electrode, during the above electrolysis.

A satellite revolves around a planet in a circular orbit. What is the work done by the satellite at any instant? Give a reason.

Name the tree: The stilt roots are underwater during high tide.

Give one Geographical reason: Canal irrigation is more suitable in the Northern Plains

1. State and define the S.I. unit of power?
2. How is the unit horse power related to the S.I. unit of power?

The diagram given below is that of a structure present in a human kidney.
Study the same and answer the questions that follow:

1. Name the structure represented in the diagram.
2. What is the liquid
...

Mention one advantage of the use of natural gas over coal or petroleum.

The layer of the eyeball that forms the transparent Cornea

Find the value of k for which the following equation has equal roots.

$x^2 + 4kx + (k^2 - k + 2) = 0$

From the top of a cliff, the angle of depression of the top and bottom of a tower are observed to be 45 and 60° respectively. If the height of the tower is 20 m. Find:

1. the height of the cliff
2. the
...

Write three differences between summer monsoon season and retreating monsoon season.

The metal whose oxide, which is amphoteric, is reduced to metal by carbon reduction ____ . (Fe / Mg / Pb / Al)

Study the flow chart given and give balanced equations to represent the reactions A, B and C:

Which wire in a power circuit is connected to the metallic body of the appliance?

What is meant by the term quorum?