Science

Science is the systematic study of the natural world through observation, experimentation, and analysis. It involves forming hypotheses, conducting experiments, collecting data, and analyzing results to develop conclusions and theories. The primary aim of science is to understand how the universe works, from the smallest particles to the vastness of space.

Science is divided into several branches:

  • Physical Sciences – These include physics, chemistry, astronomy, and geology, and they focus on understanding the laws of matter and energy.
  • Life Sciences –These focus on living organisms and include fields like biology, ecology, and medicine.
  • Social Sciences – These study human behavior and societies, such as psychology, sociology, and economics.
  • Environmental Science –The study of the environment and the impact of human activity on it.

Scientific discoveries and advancements often lead to new technologies that improve our quality of life. Science helps answer fundamental questions about existence, provides solutions to real-world problems, and drives progress in many areas of life.

List of Science Topics
Forces and Laws of MotionOur Environment
Magnetic Effects of Electric CurrentElectricity
The Human Eye and the Colourful WorldLight – Reflection and Refraction
HeredityHow do Organisms Reproduce?
Control and CoordinationLife Processes
Carbon and its CompoundsMetals and Non-metals
Acids, Bases and SaltsChemical Reactions and Equations
TissuesMotion and Time
Is Matter Around Us Pure ?Photosynthesis
Nutrition in Plants 

Question related to Science

  1. Which tissue makes up the husk of coconut?
  2. Which part of the brain maintains posture and equilibrium of the body?
  3. How does chemical coordination occur in plants?
  4. The human eye can focus on objects at different distances by adjusting the focal length of the eye lens. This is due to (a) presbyopia. (b) accommodation. (c) near-sightedness. (d) far-sightedness
  5. We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror? What is the nature of the image? Is the image larger or smaller than the object?
  6. An automobile vehicle has a mass of 1500 kg. What must be the force between the vehicle and road if the vehicle is to be stopped with a negative acceleration of 1.7 m s–2?
  7. When is the force experienced by a current-carrying conductor placed in magnetic field largest?
  8. Which gas is usually liberated when an acid reacts with a metal ? Illustrate with an example. How will you test for the presence of this gas ?
  9. What is the role of the split ring in an electric motor?
  10. No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be (a) only plane. (b) only concave. (c) only convex. (d) either plane or convex.
  11. Oil and fat containing food items are flushed with nitrogen. Why?
  12. List the factors on which the resistance of a conductor in the shape of a wire depends.
  13. Which metals do not corrode easily?
  14. What does an odometer measure?
  15. In Faradays experiment if instead of moving the magnet towards the coil we move the coil towards the magnet. Will there be any induced current? Justify your answer. Compare the two cases.
  16. Name the three common defects of vision. What are their causes? Name the type of lens used to correct each of them.
  17. What is the difference between a reflex action and walking?
  18. To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.
  19. Write the chemical formula of hydrated copper sulphate and anhydrous copper sulphate. Giving an activity illustrate how these two are interconvertible.
  20. Which signals will get disrupted in case of a spinal cord injury?
  21. You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.
  22. Name a device that you can use to maintain a potential difference between the ends of a conductor. Explain the process by which this device does so.
  23. The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object? (a) Between the principal focus and the centre of curvature (b) At the centre of curvature (c) Beyond the centre of curvature (d) Between the pole of the mirror and its principal focus.
  24. Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.
  25. How much energy is given to each coulomb of charge passing through a 6 V battery?
  26. How is the movement of leaves of the sensitive plant different from the movement of a shoot towards light?
  27. Why do we observe random wavering or flicking of the objects near a fire or on a very hot day?
  28. Describe the process of neutralisation with the help of an example.
  29. A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision?
  30. Differentiate between metal and non-metal on the basis of their chemical properties.