In 1831, electricity became viable for use in technology when Michael Faraday created the electric dynamo. The correct answer is (C) Michael Faraday. 

Faraday's work on electromagnetic induction laid the foundation for the development of electric generators and dynamos, which played a crucial role in the generation of electric power.

Lala Lajpat Rai was popularly known as "Punjab Kesari" or "Sher-e-Punjab".

Mount Everest, the highest peak in the world, is named after Sir George Everest, a Welsh geographer and surveyor general of India in the 19th century. Although Sir George Everest himself objected to having the mountain named after him, the proposal was accepted, and the mountain retained the name Everest. The naming was done by the Royal Geographical Society in 1865 to honor his contributions to the Great Trigonometrical Survey of India, which played a significant role in mapping the subcontinent.