List of top Science Questions asked in Bihar Board Class X Exam

Why does the colour of the solution change when a piece of iron is added to copper sulphate solution?
What do you understand by homologous series? Write with examples.
What are acids? Give any two examples. Explain the effect of an acid on an indicator.
Why is sodium metal kept immersed in kerosene?
Describe a method to find the focal length of a convex lens.
Describe Oersted's experiment to show that a magnetic field is produced around a current carrying conductor wire.
What is nuclear fusion?
What is fossil fuel? Write with example.
How does an electromagnet work?
What is electric current? Write its equation and unit.
Why does the coin placed in water appear raised?
Testosterone is secreted by
The male reproductive organ of a flower is called
Which is the largest part of the human brain?
What is light beam? How many types of it are there?
Hormone that stops cell division in plants is called
Which excretory substance is mainly released from acacia plants?
The flow of blood in the heart is
Blood is
How many pairs of respiratory pores are found in a cockroach?
The process of purification of blood by dialysis machine is called
How do protozoans expel excretory substances?
Which blood group is known as universal donor?
The length of the small intestine in herbivorous animals is
Which of the following is the commercial unit of electrical energy?