Is Matter Around Us Pure ? — Science STD 9 — Question

Which of the following class of forces is different from others?

Which one of the following is not the unit of energy?

1. Joule.
2. Newton-metre.
3. Kilowatt.
4. Kilowatt-hour.

The relative densities of four liquids P, Q, R and S are 1.26, 1.0, 0.84 and 13.6 respectively. An object is floated in all these liquids, one by one. In which liquid the object will float with its maximum volume submerged under the liquid?

1. P
2. Q
3. R
4. S

The idea ‘omins cellula e cellula’ which means that all living cells arise from preecisting cells was given by:

1. Robery Brown
2. Purkinje
3. Rudolf Virchow
4. Schleiden

Dermal tissue is derived from:

The cation of an element has:

Action and reaction:

Forest destruction results in:

1. Loss of wild life.
2. Floods and drought.
3. Soil erosion.
4. All of these.

Acceleration is always in the direction:

A body is said to be under balanced forces when the resultant force acting on the body is: