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

Write about five important sexually transmitted diseases, their causal pathogens, and symptoms.
What is glycolysis?
Define nutrition.
What is the role of petals in flowers?
What is environment?
What is hormone?
DNA is the basis of heredity. How?
Define pollination. Write the effect of rainfall on pollination.
What is sinoauricular node?
Why does the aqueous solution of an acid conduct electricity?
What is ozone? Explain its importance.
Briefly describe the benefits of rainwater harvesting.
Why is it necessary to balance a chemical equation?
What is covalent bond? Give two examples of it.
What is an ore?
What is corrosion? Explain with example.
Write the steps involved in the extraction of metals from ores.
Explain scattering of light.
How is the concentration of OH\(^-\) ion affected on adding a base in excess to sodium hydroxide solution?
Mention two reactions that displace chlorine from bleaching powder by giving equations.
How does the eye control the amount of light entering into it?
Prove for a concave mirror \[ \frac{1}{v} + \frac{1}{u} = \frac{1}{f} \]
What is the source of energy of the sun? Explain.
What is a non-renewable source of energy? Give two examples of it.
Which quantity remains constant in Ohm's law, when temperature is constant? Explain.