Geography

The oldest mountains in India are the Aravalli Range, which are among the oldest mountain ranges in the world, formed over 1.8 billion years ago. The youngest major mountain range in the world is the Himalayas, which began forming about 40-50 million years ago. The Himalayas extend across several countries including India, Nepal, Bhutan, Pakistan, and China. Since the youngest mountains (the Himalayas) are present in multiple countries, none of the single options (Pakistan, China, India) alone fully represent the location of the youngest mountains. Therefore, the most accurate answer is 'None of these' (option D).

Changa Manga Forest covers approximately 46.6 square kilometers (10,000 acres), making option B the most accurate. The other options either overstate or understate the area slightly.

There are generally recognized to be 45 landlocked countries in the world. This number can vary slightly depending on definitions and political changes, but 45 is the most widely accepted count.

The Caspian Sea is the largest enclosed inland body of water on Earth, classified as the largest saltwater lake in the world due to its size and salinity. The other options are smaller lakes or reservoirs and do not surpass the Caspian Sea in size.

The Colorado River is a major river located in the United States, primarily flowing through the southwestern region. Therefore, the correct answer is USA.

Derawar Fort is located in the Cholistan Desert of Pakistan, making option A the correct answer. The Cholistan Desert is known for this historic fort, distinguishing it from the Thar and Thal deserts.

Sakaser is the highest peak in the Salt Range, reaching an elevation of about 1,522 meters. K-2 and Nanga Parbat are much higher peaks but located in the Karakoram and Himalayas, respectively, not in the Salt Range.

Derawar Fort is located in the Cholistan Desert in Pakistan. This desert is known for its arid climate and historical sites, including the Derawar Fort.

The Colorado River is primarily located in the USA, flowing through several states including Colorado, Utah, Arizona, Nevada, California, and into Mexico. Therefore, option A is correct.

Sakesar is the highest peak in the Salt Range of Pakistan, reaching an elevation of about 1,525 meters. K-2 and Nanga Parbat are much higher peaks but are located in the Karakoram and Himalaya ranges, respectively, not the Salt Range.