What is the SI unit of frequency?

Convex mirror is generally used in _____.

Which of the following micro-organism causes diseases like polio and chicken pox?

Which among the following is not a connective tissue?

Red rot is a disease caused to which of the following plant?

Soil having high content of aluminum and iron oxide is also known as _____.

Which of the following is the most abundant metal on Earth's crust?

The second Battle of Tarain was fought between __________.