CBSE Class 10 Science MCQs: Physics, Chemistry, and Biology
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Questions and Answers

What is the key concept related to Electric Charges and Fields?

  • An electric field is created by charges and produces forces on other charges. (correct)
  • An electric field is created by sound waves and produces forces on molecules.
  • An electric field is created by magnets and produces forces on other magnets.
  • An electric field is created by light energy and produces forces on objects.

    • What happens to the brightness of other bulbs in a series circuit when the resistance of one bulb is increased?

  • Burn brighter
  • Turn off
  • Burn dimmer (correct)
  • Stay the same brightness

    • How many electrons are present in the first energy level of an atom?

  • 2 (correct)
  • 8
  • 0
  • 18

    • What forms between atoms when they share electrons?

    <p>Polar covalent bonds</p> Signup and view all the answers

    Which molecule has the largest molecular mass among N₂, O₂, and H₂S?

    <p>H₂S</p> Signup and view all the answers

    What type of reaction is represented by the equation: N₂(g) + 3H₂(g) ⇌ 2NH₃(g)?

    <p>Equilibrium reaction</p> Signup and view all the answers

    In which type of solution do solute particles have a fixed position in the solvent?

    <p>Homogeneous</p> Signup and view all the answers

    Which organelle converts light energy into chemical energy during photosynthesis?

    <p>Chloroplast</p> Signup and view all the answers

    Which organ is responsible for producing red blood cells?

    <p>Liver</p> Signup and view all the answers

    Which of the following is considered a biotic factor in an ecosystem?

    <p>Tiger</p> Signup and view all the answers

    Study Notes

    CBSE Class 10 Science MCQs: A Deep Dive into Physics, Chemistry, and Biology

    Preparing for the CBSE Class 10 Science exams is a thrilling journey through the world of Physics, Chemistry, and Biology. To make your revision more engaging and effective, let's dive into a few of the most fascinating topics covered in these subjects' MCQs.

    Physics

    1. Electric Charges and Fields

      • Key concept: An electric field is created by charges and produces forces on other charges.
      • Question: What is the direction of the electric field around a positively charged sphere?

    2. Electric Current and Circuits

      • Key concept: Electric current is the flow of electric charge, and components in a circuit allow current to flow.
      • Question: In a series circuit, increasing the resistance of one bulb will cause the other bulb(s) to:
        1. Burn brighter
        2. Burn dimmer
        3. Stay the same brightness

    3. Magnetic Effects of Currents

      • Key concept: A current-carrying wire creates a magnetic field around it.
      • Question: What is the direction of the magnetic field due to a straight wire carrying current?

    Chemistry

    1. Atomic Structure

      • Key concept: Atoms consist of a nucleus containing protons and neutrons, surrounded by electrons.
      • Question: How many electrons are present in the first energy level of an atom?

    2. Chemical Bonding and Molecular Structure

      • Key concept: Covalent bonds form between atoms when they share electrons.
      • Question: Which of the following has the largest molecular mass: N₂, O₂, or H₂S?

    3. Chemical Reactions

      • Key concept: Chemical reactions involve the breaking and formation of chemical bonds between atoms.
      • Question: What type of reaction is represented by the equation: N₂(g) + 3H₂(g) ⇌ 2NH₃(g)

    4. Solutions

      • Key concept: Solutions consist of solute particles dispersed in a solvent.
      • Question: In which type of solution, does the solute particles have a fixed position in the solvent:
        1. Homogeneous
        2. Heterogeneous

    Biology

    1. Cell Structure and Function

      • Key concept: Cells are the basic unit of life, consisting of organelles and structures.
      • Question: Which organelle is responsible for the conversion of light energy to chemical energy in photosynthesis?

    2. Human Physiology

      • Key concept: The human body is a system consisting of interconnected organs and systems.
      • Question: Which organ is responsible for making red blood cells:
        1. Kidney
        2. Liver
        3. Bone marrow

    3. Ecology and Environment

      • Key concept: Ecosystems consist of communities of organisms interacting with their environment.
      • Question: Which of the following is a biotic factor:
        1. Temperature
        2. Rainfall
        3. Tiger

    4. Genetics and Evolution

      • Key concept: Genes are segments of DNA that code for specific traits, and evolution is the process of change in traits over time.
      • Question: What is the difference between dominant and recessive alleles in genetics?

    With a little practice and the help of this article, you'll be able to confidently tackle the CBSE Class 10 Science Multiple Choice Questions in Physics, Chemistry, and Biology, and ultimately excel in your exams!

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    Prepare for the CBSE Class 10 Science exams with a deep dive into Physics, Chemistry, and Biology through multiple-choice questions. Topics include electric charges, atomic structure, cell function, and more. Enhance your revision and test your knowledge with engaging MCQs!

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