1. During an earthquake, the velocity of the upper part of the waves will increase along with the increase in density which will propel the object passing through it.

2. Earthquake shock When seismic waves occur in a place with soft soil sediments, their propagation increases the natural period, which produces an echo.

The first Public Bicycle Sharing (PBS) system in India was launched in 2017 in Mysuru.

1. The longest coastline in India is along the state of Gujarat. Its length is approximately 1,600 kilometres. This coastline borders the Arabian Sea and includes many beautiful beaches, islands and ports.

2. Gujarat's coastline is important for India's economy and culture. It is an important centre for tourism, fishing and trade. Several important ports are also located on the coastline, such as Mundra, Kandla and Porbandar.

All the statements about Ahmedabad city are true.

1. The first mill in Ahmedabad was established on May 30, 1861.

2. Ahmedabad is located on the banks of the river Sabarmati.

3. Ahmedabad was often referred to as the ‘Manchester of India’.

4. Ahmedabad is situated very close to cotton-growing areas.