Tissues — Science STD 9 — Question

Mark the correct statement(s).

To which height is ozonosphere present over the equator:

1. 11–16km
2. 23–25km
3. 16–20km
4. 10–12km

Which one of the following statements about power stations is not true?

1. Hydroelectric power stations use water to drive turbines.
2. In a power station, turbines drive generators.
3. Electricity from thermal power stations differs from that produced in hydroelectric power stations.
4. In hydroelectric power stations and thermal power stations, alternators produce electricity.

When a net force acts on an object, then the object will accelerate in the direction of force with an acceleration proportional to the

The ratio of the radii of the atom to the nucleus is:

The property/ properties which enable copper metal to be used for making electric wires is/ are:

Lysosome arises from:

Which of the following is the exception of cell theory?

Give reason as to why relative density has no unit:

The covering tissue of external and internal surfaces of animals is: