Q3.

Satellites used for telecommunication relay are kept in a geostationary orbit. A satellite is said to be on such an orbit when:

1. The orbit is geosynchronous.

2. The orbit is circular.

3. The orbit lies in the plane of the Earth's equator.

4. The orbit is at an altitude of 22,236 km.

Select the correct answer using the codes given below:

Q4.

India has experienced persistent and high food inflation in the recent past. What could be the reasons?

1. Due to a gradual switchover to the cultivation of commercial crops, the area under the cultivation of food grains has steadily decreased in the last five years by about 30.

2. As a consequence of increasing incomes, the consumption patterns of the people have undergone a significant change.

3. The food supply chain has structural constraints.

Which of the statements given above are correct?

Q5.

At present, scientists can determine the arrangement or relative positions of genes or DNA sequences on a chromosome. How does this knowledge benefit us?

1. It is possible to know the pedigree of livestock.

2. It is possible to understand the causes of all human diseases.

3. It is possible to develop disease-resistant animal breeds.

Which of the statements given below is/are correct?