CBSE Class 10 · Science

Science essentials

29 practice questions, each with the answer and an explanation.

Practise Science essentials now

Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 29 questions

  1. Which gas is evolved when a metal reacts with a dilute acid?
  2. What is the pH of a neutral solution at 25 °C?
  3. Which type of lens is used to correct myopia (short-sightedness)?
  4. What is the SI unit of electric current?
  5. The reaction Fe + CuSO₄ → FeSO₄ + Cu is an example of a
  6. Which non-metal is a liquid at room temperature?
  7. How many chambers does the human heart have?
  8. Which gas is released during photosynthesis?
  9. Which gas turns lime water milky?
  10. Mendel performed his experiments on
  11. Which part of a neuron receives information from other neurons?
  12. Which hormone regulates the level of sugar in the blood?
  13. Which of these is a renewable source of energy?
  14. The ozone layer protects living things from
  15. What is the atomic number of carbon?
  16. How many carbon atoms are there in a molecule of butane?
  17. Which functional group is present in ethanol?
  18. Increasing the length of a wire, keeping other factors constant, its resistance
  19. A potential difference of is applied across a resistor of . What is the current (in A)?
  20. A potential difference of is applied across a resistor of . What is the current (in A)?
  21. A potential difference of is applied across a resistor of . What is the current (in A)?
  22. A potential difference of is applied across a resistor of . What is the current (in A)?
  23. A potential difference of is applied across a resistor of . What is the current (in A)?
  24. What is the focal length (in cm) of a concave mirror whose radius of curvature is ?
  25. What is the focal length (in cm) of a concave mirror whose radius of curvature is ?
  26. What is the focal length (in cm) of a concave mirror whose radius of curvature is ?
  27. What is the power (in dioptres) of a convex lens of focal length ?
  28. What is the power (in dioptres) of a convex lens of focal length ?
  29. What is the power (in dioptres) of a convex lens of focal length ?

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