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Bihar Board Class 10 · Science · 30 past questions

  1. Q1 2026
    Which gas is responsible for global warming ?
  2. Q2 2026
    Under whose leadership was the 'Chipko Movement' started ?
  3. Q3 2026
    Which of the following is a non-biodegradable substance ?
  4. Q4 2026
    Tiger is a consumer of
  5. Q5 2026
    Which of the following is a decomposer ?
  6. Q6 2025
    Which gas is responsible for global warming ?
  7. Q7 2025
    The chemical which shows biomagnification is
  8. Q8 2025
    Primary consumers are called
  9. Q9 2025
    CFC is widely used in
  10. Q10 2025
    What is the new concept of waste management ?
  11. Q11 2023
    Euro-II is related to
  12. Q12 2023
    Which is an example of a decomposer?
  13. Q13 2023
    Which is the main source of energy on earth?
  14. Q14 2023
    Which of the following is/are a part of environment?
  15. Q15 2023
    How many trophic levels are there in a forest ecosystem?
  16. Q16 2023
    The molecular formula of ozone is
  17. Q17 2023
    The flow of energy in an ecosystem is
  18. Q18 2023
    The tiger is a consumer of
  19. Q19 2022
    The source of energy in the ecosystem is
  20. Q20 2022
    What is the main cause of depletion of ozone layer ?
  21. Q21 2022
    The molecular formula of ozone is
  22. Q22 2022
    BS-IV is associated with
  23. Q23 2022
    Which type of ecosystem is a pond?
  24. Q24 2022
    Which of the following are present in maximum number in an ecosystem?
  25. Q25 2020
    Ultimate source of energy for all living organisms is
  26. Q26 2020
    In which direction does energy flow in an ecosystem?
  27. Q27 2020
    The ozone layer is found
  28. Q28 2018
    Which of the following constitutes a Food chain?
  29. Q29 2016
    The presence of CO$_2$ gas in atmosphere is
  30. Q30 2015
    Ozone layer is found in