P-2 Animal Classification — Science STD 10 — Question

5 cm high object is placed at a distance of 10 cm from a converging lens of focal length of 20 cm. Determine the position, size and type of the image.

An object placed 4cm in front of a converging lens produces a real image 12cm from the lens.

1. What is the magnification of the image?
2. What is the focal length of the lens?
3. Draw a ray diagram to show the formation of image. Mark clearly F and 2F in the diagram.

A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggested that the genetic make up (or genotype) of the tall parent can be depicted as:

1. TTWW
2. TTww
3. TtWW
4. TtWw

Give reason for your choice.

Explain the following with the help of a diagram :
Hypermetropia or Farsightedness

State the following factors on which the strength of the magnetic field of a circular loop depends?

Explain the following with the help of a diagram :
Myopia or Nearsightedness

Why does human being have an important place in the environment?

Explain with diagram step-by-step energy conversion in Power plant based on wind energy.

What is the cartesian sign convention used for spherical mirrors?

State any five steps to reduce the consumption of coal and petroleum products.