Answer: B) 2/3 Explanation: Total coins 30 In that, 1 rupee coins 20 50 paise coins 10Probability of total 1 rupee coins =  20C11 Probability that 11 coins are picked = 30C11 Required probability of a coin now picked from the box is 1 rupee = 20C11/30C11 = 2/3.

1. Simlipal Bio-Reserve (Sanctuary) is located in Orissa.

2. The biosphere reserve has the largest area of sal in the whole of India. Furthermore, the tropical monsoon climate provides ideal conditions for the development of a distinctive biodiversity, highlighted by 1,076 species of vascular plants.

3. These include 93 species of orchids, 300 species of medicinal plants and 52 species of endangered flora. The two endemic species of orchid are Eria meghasaniensis and Taenia hookeriana.

4. Notable botanical species in the sanctuary include Callicarpa arborea (a species of beautyberry), Bombax ceiba (cotton tree) and Madhuca longifolia (manhua).

The invention of the railway engine is credited to George Stephenson. The correct answer is (D) George Stephenson. George Stephenson, an English engineer, is known for developing the first practical steam locomotive, named "The Rocket," which played a crucial role in the early development of railways.