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Exam Cracker Science CBSE Question Bank For Class 10th

by Madhurima
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  • Q1
    Why should magnesium ribbon be cleaned before burning?
    A1

    To remove the layer of magnesium oxide, ensuring direct reaction with oxygen for a clean combustion experiment.

  • Q2
    Why does distilled water not conduct electricity?
    A2

    It lacks ions. Only water containing dissolved salts or acids provides ions for electrical conductivity.

  • Q3
    Why are covalent compounds generally poor conductors of electricity?
    A3

    They do not form ions or free electrons due to shared electrons, preventing electrical current flow.

  • Q4
    What is the role of auxin in plants?
    A4

    Auxin promotes cell elongation, helping plants grow towards light (phototropism) and away from gravity.

  • Q5
    Define vegetative propagation.
    A5

    It is a form of asexual reproduction where new plants grow from fragments like stems, roots, or leaves.

  • Q6
    State the two laws of reflection of light.
    A6

    Angle of incidence equals angle of reflection. Incident ray, reflected ray, and normal lie in the same plane.

  • Q7
    Why does the sky appear dark to an astronaut?
    A7

    In space, there is no atmosphere to scatter sunlight, so the sky appears dark instead of blue.

  • Q8
    How can you identify the poles of a solenoid?
    A8

    Use the clock rule or right-hand thumb rule; current direction determines the north and south poles.

  • Q9
    What is the function of a step-up transformer?
    A9

    It increases alternating voltage from primary to secondary coil while decreasing current proportionally.

  • Q10
    What is the role of decomposers in an ecosystem?
    A10

    They break down dead organic matter, releasing nutrients back into the soil for reuse by producers.

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Have Doubts Regarding This Product ? Ask Your Question

  • Q1
    Why should magnesium ribbon be cleaned before burning?
    A1

    To remove the layer of magnesium oxide, ensuring direct reaction with oxygen for a clean combustion experiment.

  • Q2
    Why does distilled water not conduct electricity?
    A2

    It lacks ions. Only water containing dissolved salts or acids provides ions for electrical conductivity.

  • Q3
    Why are covalent compounds generally poor conductors of electricity?
    A3

    They do not form ions or free electrons due to shared electrons, preventing electrical current flow.

  • Q4
    What is the role of auxin in plants?
    A4

    Auxin promotes cell elongation, helping plants grow towards light (phototropism) and away from gravity.

  • Q5
    Define vegetative propagation.
    A5

    It is a form of asexual reproduction where new plants grow from fragments like stems, roots, or leaves.

  • Q6
    State the two laws of reflection of light.
    A6

    Angle of incidence equals angle of reflection. Incident ray, reflected ray, and normal lie in the same plane.

  • Q7
    Why does the sky appear dark to an astronaut?
    A7

    In space, there is no atmosphere to scatter sunlight, so the sky appears dark instead of blue.

  • Q8
    How can you identify the poles of a solenoid?
    A8

    Use the clock rule or right-hand thumb rule; current direction determines the north and south poles.

  • Q9
    What is the function of a step-up transformer?
    A9

    It increases alternating voltage from primary to secondary coil while decreasing current proportionally.

  • Q10
    What is the role of decomposers in an ecosystem?
    A10

    They break down dead organic matter, releasing nutrients back into the soil for reuse by producers.

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