The Lötschberg Base Tunnel in Switzerland is currently the world’s longest land tunnel (except for some metro tunnels) and accommodates passenger and freight trains. It runs between Frutigen, Berne and Raron, Valais. It is the third longest tunnel overall.

Correct Option: B

The Lötschberg Base Tunnel in Switzerland is currently the world’s longest land tunnel (except for some metro tunnels) and accommodates passenger and freight trains. It runs between Frutigen, Berne and Raron, Valais. It is the third longest tunnel overall.

Bamako is the capital and largest city of Mali. In 2006, it was estimated to be the fastest growing city in Africa and sixth-fastest in the world. It is the seventh-largest West African urban center after Lagos, Abidjan, Kano, Ibadan, Dakar, and Accra. It is located on the Niger River.

Correct Option: B

Bamako is the capital and largest city of Mali. In 2006, it was estimated to be the fastest growing city in Africa and sixth-fastest in the world. It is the seventh-largest West African urban center after Lagos, Abidjan, Kano, Ibadan, Dakar, and Accra. It is located on the Niger River.

The Nile, a major north-flowing river in northeastern Africa, is generally regarded as the longest river in the world. It is 6,853 km long. The Amazon (South America) and Yangtze of China are at second and third positions with a length of 6400 km and 6300 km respectively.

Correct Option: D

The Nile, a major north-flowing river in northeastern Africa, is generally regarded as the longest river in the world. It is 6,853 km long. The Amazon (South America) and Yangtze of China are at second and third positions with a length of 6400 km and 6300 km respectively.

Dekke Toba is an Indonesian fish found in the Lake Toba which is a volcanic lake in the middle of the northern part of the Sumatra island. It is the largest lake in Indonesia and the largest volcanic lake in the world.

Correct Option: D

Dekke Toba is an Indonesian fish found in the Lake Toba which is a volcanic lake in the middle of the northern part of the Sumatra island. It is the largest lake in Indonesia and the largest volcanic lake in the world.

The Sahara covers most of North Africa and extends over Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Western Sahara, Sudan and Tunisia. It covers about 1D 4 of the African continent.

Correct Option: C

The Sahara covers most of North Africa and extends over Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Western Sahara, Sudan and Tunisia. It covers about 1D 4 of the African continent.