Geography

The Vatican City is the smallest republic in the world by both area and population. Nauru is a small island country but larger than the Vatican. Indonesia is a large country, and "None of these" is incorrect.

Pakistan has four famous ports: Karachi Port, Port Qasim, Gwadar Port, and Keti Bandar. Therefore, option B (4) is correct.

An ocean is the largest body of water compared to lakes, rivers, and seas. Oceans cover the greatest area on Earth's surface, making them the biggest among the options.

Vatican City is the smallest country in the world by land area, covering about 44 hectares (110 acres). The UK and USA are much larger countries, and 'None of these' is incorrect since Vatican City is listed.

Changa Manga is a large man-made forest located near Kasur, Punjab, which is not part of Lahore, Karachi, or Quetta. Therefore, none of the cities listed in options A, B, or C is correct, making 'None of these' the correct answer.

The road connecting Pakistan and China is known as the Karakoram Highway, which is a major trade route and one of the highest paved international roads in the world.

The Colorado River is a major river located in the United States, flowing through several states including Colorado, Utah, Arizona, Nevada, and California. Therefore, the correct answer is USA.

Hub Dam is located on the Hub River, which flows near Karachi in Pakistan. Therefore, the correct answer is Hub River.

Derawar Fort is located in the Cholistan Desert of Pakistan. It is a prominent historical fort situated in this desert region, making option A the correct answer.

Soan Sakaser is the highest peak in the Salt Range, located in Pakistan. Nanga Parbat and K2 are much higher peaks but are part of the Himalayas and Karakoram ranges, not the Salt Range.