Mention two characteristics of the Indian monsoon.

How is the Speaker of the Lok Sabha elected?

State your observations when ammonium hydroxide solution is added drop by drop and then in excess to each of the following solutions:

1. copper sulphate solution
2. zinc sulphate solution.

Colour blindness is more common in men than in women.

Give scientific reason.

Two metallic blocks P and Q having masses in ratio 2:1 are supplied with the same amount of heat. If their temperatures rise by same degree, compare their specific heat capacities.

A man observes the angle of elevation of the top of the tower to be 45^o. He walks towards it in a horizontal line through its base. On covering 20 m the angle of elevation changes to 60^o. Find the...

Conductivity of dilute hydrochloric acid is greater than that of acetic acid

If the 6th term of an A.P. is equal to four times its first term and the sum of first six terms is 75, find the first term and the common difference.

The Second half of the 19th century witnessed the growth of a strong feeling of Nationalism. With reference to the statement, answer the following: State any three ways in which the Press played an...

1. Name the waves used for echo depth sounding.
2. Give one reason for their use for the above purpose.
3. Why are the waves mentioned by you not audible to us?

Complete stoppage of menstrual cycle in females.

Give the Biological / technical term

Name two water harvesting systems practised in India.

Name a manufacturing centre for each of the following industries:

1. Aircraft
2. HMT
3. Railway coaches

Briefly answer: Why is petroleum often referred to as "liquid gold"

State the characteristics required of a good thermion emitter

Give reasons for the following: During the day:

1. Clouds appear white.
2. Sky appears blue.