Which of the following is a hot waterfall?

Step 1: Answer Question 42. What is the difference in degree between the latitudinal and longitudinal expansions of India? The latitudinal extent of India is approximately $29^\circ 2'$ ($37^\circ 6' N - 8^\circ 4' \text{ N}$). The longitudinal extent of India is approximately $29^\circ 18'$ ($97^\circ 25' E - 68^\circ 7' \text{ E}$). Both are approximately $30^\circ$. The question asks for the approximate value of these expansions. The correct option is (C). $\boxed{*(C) 30°*}$

Step 2: Answer Question 43. Which of the following peaks is not in India? Mount Everest is located in Nepal and China, not in India. K2 is in a region claimed by India but not administered by it. Kamet and Nanda Devi are in India. The correct option is (C). $\boxed{*(C) Mount Everest*}$

Step 3: Answer Question 44. The height of the Saddle peak is? Saddle Peak, the highest point in the Andaman and Nicobar Islands, has a height of approximately 738 meters. The correct option is (D). $\boxed{*(D) 738 m*}$

Step 4: Answer Question 45. The state having the longest coastline is? Gujarat has the longest coastline among the Indian states. The correct option is (A). $\boxed{*(A) Gujarat*}$

Step 5: Answer Question 46. Which of the following is a saline lake? Sambhar Lake in Rajasthan is India's largest inland salt lake. Wular Lake and Dal Lake are freshwater lakes, and Govind Sagar is a reservoir. The correct option is (C). $\boxed{*(C) Sambhar Lake*}$

Step 6: Answer Question 47. Which of the following is a hot waterfall? Brahmakund is a well-known hot spring in India. While not a traditional waterfall, it is the only option associated with hot water. Kakolat, Garsoppa (Jog Falls), and Shivasamudram are cold waterfalls. The correct option is (C). $\boxed{*(C) Brahmakund*}$