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

Differentiate between metals and non-metals on the basis of physical and chemical properties.
What is called absolute refractive index ?

The changes that occur during adolescence are called
 

Explain recycling of waste materials with examples.
What is photosynthesis ? Describe it with a suitable diagram.
What is the difference between xylem and phloem ?
What is phototropism ?
What is excretion ? Write the names of its two main parts.
Define respiration.
Write the names of four organelles of a cell.
What is pollination ?
What are the harmful effects of aerosol chemicals ?
How is DNA the basis of heredity ?
What is an indicator ? Write the name of an indicator.
What do you understand by short and long periods of periodic table ?
What is the difference between an atom and an ion ?
What is energy crisis ? Mention the measures to resolve it.
Define ores.
Why have detergents replaced soap ?
What are fossil fuels ?
What is called the best source of energy ?
Why is an aqueous solution of sodium carbonate alkaline ?
Describe the structure and working method of a biogas plant.
Why is inert gas filled in electric bulb ?
What are defects of vision ? What are their types ? How are the defects resolved ?