List of top Questions asked in Bihar Board X - 2025

Write the names of endocrine glands found in humans.
Describe a method to find the focal length of a convex lens.
Why does the colour of the solution change when a piece of iron is added to copper sulphate solution?
Why is it necessary to keep the plaster of Paris away from moisture? Explain.
What are acids? Give any two examples. Explain the effect of an acid on an indicator.
Why is sodium metal kept immersed in kerosene?
Which metallic property does graphite exhibit despite being a non-metal?
What are aliphatic compounds?
What do you understand by homologous series? Write with examples.
Why does the coin placed in water appear raised?
How does an electromagnet work?
What is nuclear fusion?
What is electric current? Write its equation and unit.
What is fossil fuel? Write with example.
Describe Oersted's experiment to show that a magnetic field is produced around a current carrying conductor wire.
Which excretory substance is mainly released from acacia plants?
Which is the largest part of the human brain?
Testosterone is secreted by
Hormone that stops cell division in plants is called
The male reproductive organ of a flower is called
What is light beam? How many types of it are there?
How many pairs of respiratory pores are found in a cockroach?
The flow of blood in the heart is
Blood is
Which blood group is known as universal donor?