Which of the following is a hot waterfall?

Who makes the law in the state?
In a state, laws are primarily made by the Legislative Assembly (Vidhan Sabha).
The correct option is (A).

Who administers oath to the President?
The Chief Justice of India administers the oath of office to the President of India.
The correct option is (C).

How many houses are there in the Indian Parliament?
The Indian Parliament has two houses: the Lok Sabha (House of the People) and the Rajya Sabha (Council of States).
The correct option is (B).

In which article is the right to vote given?
The right to vote (universal adult franchise) is enshrined in Article 326 of the Indian Constitution. None of the given options (Article-12, Article-15, Article-19, Article-21) directly refer to the right to vote.
Since I must choose an option, and none are correct, I will state the correct article.
The correct article is Article 326.

What is the minimum age to become a member of the Lok Sabha?
The minimum age required to become a member of the Lok Sabha is 25 years.
The correct option is (C).

What is India's position in the world in terms of area?
India is the 7th largest country in the world by area.
The correct option is (A).

What is the difference in degree between the latitudinal and longitudinal expansions of India?
The latitudinal extent of India is approximately $29^\circ 2'$ ($37^\circ 6' \text{ N} - 8^\circ 4' \text{ N}$).
The longitudinal extent of India is approximately $29^\circ 18'$ ($97^\circ 25' \text{ E} - 68^\circ 7' \text{ E}$).
The difference between these two expansions is very small, approximately $16'$. However, the options provided are large values. In the context of such questions, it is often implied to ask for the approximate value of either the latitudinal or longitudinal extent, both of which are close to $30^\circ$.
The correct option is (C).

Which of the following peaks is not in India?
Mount Everest is located in Nepal and China, not in India. K2 is in the Karakoram range, on the border of Pakistan and China, in a region claimed by India but not administered by it. Kamet and Nanda Devi are in India. Mount Everest is unequivocally outside India.
The correct option is (C).

The height of the Saddle peak is?
Saddle Peak, the highest point in the Andaman and Nicobar Islands, has a height of approximately 732 meters or 738 meters depending on the source.
The correct option is (D).

The state having the longest coastline is?
Gujarat has the longest coastline among the Indian states.
The correct option is (A).

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).

Which of the following is a hot waterfall?
Brahmakund is a well-known hot spring in India. While the question asks for a "hot waterfall," which is rare, among the given options, Brahmakund is the only one associated with hot water (as a hot spring). Kakolat, Garsoppa (Jog Falls), and Shivasamudram are cold waterfalls.
The correct option is (C).