Work And Energy — Science STD 9 — Question

Epithelial tissue always has an exposed outer surface and an inner surface anchored to connective tissue by a thin, non- cellular structure called the:

Which one is made of dead cells:

A cell will swell up if:

The evaporation of water increases under the following conditions:

1. Increase in temperature, decrease in surface area.
2. Increase in surface area, decrease in temperature.
3. Increase in surface area, rise in temperature.
4. Increase in temperature, increase in surface area, addition of common salt.

Lipids and proteins constituting the cell membrane are synthesized at:

The main source of food is/ are:

A metal in which even iron can float is:

1. Sodium.
2. Magnesium.
3. Mercury.
4. Manganese.

Which of the following frequencies of sound elephants produce?

A satellite is launched in a circular orbit of radius R. Another satellite is also launched in an orbit of radius 1.1R. The period of the second satellite is larger than the first by approximately.