State one disadvantage of using coal as a source of power

Give a chemical test to distinguish between the following pairs of chemicals:

1. Lead nitrate solution and Zinc nitrate solution
2. Sodium chloride solution and Sodium nitrate solution

Carbon monoxide is dangerous when inhaled.

In the given figure AB = 9 cm, PA = 7.5 cm and PC = 5 cm. Chords AD and BC intersect at P.

Give two reasons to explain as to why the Tropical Evergreen Forests are difficult to exploit for commercial purpose.

The diagram shown below is the longitudinal section of a testis of man. Study it carefully and answer the questions that follow: 

1.  Label the parts numbered 1 to 3 in the diagram. 
2. In which part of the
...

Burning of ammonia in air.

Which one of the following is a Greenhouse gas

1. Oxygen
2. Methane
3. Sulphur dioxide
4. Nitrogen

1. What is an echo?
2. State two conditions for an echo to take place.

The individual flattened stacks of membranous structures inside the chloroplasts are known as:

1. Grana
2. Stroma
3. Thylakoids
4. Cristae

Explain any three political causes of the Revolt of 1857.

Given below are groups of terms. In each group the first pair indicates the relationship between the two terms. Rewrite and complete the second pair on a similar basis.

Example: Oxygen : Inspiration...

Write one advantage of connecting electrical appliances in parallel combination.

(i) With reference to the direction of action, how does a centripetal force differ from a centrifugal force during uniform circular motion?

(ii) Is centrifugal force the force of reaction of...

The energy released when an electron is added to a neutral gaseous isolated atom to form a negatively charged ion.

Differentiate between Surface water and Ground water.