Work And Energy — Science STD 9 — Question

Causes of water pollution are:

1. Inorganic.
2. Organic.
3. Biological.
4. All of these.

An organism having some characteristics of plant and animal kingdom is:

The phylum of sedentary animals is:

1. Mollusca.
2. Echinodermata.
3. Porifera.
4. Both (a) and (b).

The best way to recover sugar form an aqueous sugar solution is:

1. Evaporation to dryness.
2. Distillation.
3. Filtration.
4. Crytallisation.

Which wave property determines the loudness of sound?

Natural system of classification employs:

1. Compleify of cell structure.
2. Complexity of body structure.
3. Organisation.
4. All the above.

The botanical name of Egyptian clover is:

Which of the following statement is correct?

Why is atom electrically neutral:

Particles P and Q are undergoing uniform horizontal circular motions along concentric circles of different radii in clockwise sense P completes each round in 2min while Q does it is 5min time required by Q to make one revolution around P is.