Ch.10: Electricity - Pre-Mock Exam Points
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Questions and Answers

What is density defined as?

  • Volume per unit mass
  • Weight per unit length
  • Mass per unit area
  • Mass per unit volume (correct)
  • Which factor affects the density of an object if the volume remains the same?

  • Shape of the object
  • Temperature
  • Mass of the object (correct)
  • Material composition
  • How does the density of an object change when its mass increases?

  • Density becomes zero
  • Density remains constant
  • Density decreases
  • Density increases (correct)
  • In the context of irregular solids, how is the volume calculated?

    <p>By subtracting two volume readings from a measuring cylinder (D)</p> Signup and view all the answers

    Which precaution is taken to prevent parallax error when measuring liquid volume?

    <p>Looking perpendicular to the scale (B)</p> Signup and view all the answers

    What is the relationship between mass and density for the same material?

    <p>As mass increases, density increases (C)</p> Signup and view all the answers

    What is the SI unit for measuring speed?

    <p>Meter per second (m/s) (D)</p> Signup and view all the answers

    What symbol represents acceleration?

    <p>a (D)</p> Signup and view all the answers

    What does a negative acceleration value indicate?

    <p>The object is slowing down (D)</p> Signup and view all the answers

    What does a speed-time graph with a horizontal line represent?

    <p>Constant velocity (B)</p> Signup and view all the answers

    What is the SI unit for measuring force?

    <p>Newton (N) (B)</p> Signup and view all the answers

    What is the combined effect of several forces called?

    <p>Resultant force (D)</p> Signup and view all the answers

    What is the unit for measuring current?

    <p>Ampere (C)</p> Signup and view all the answers

    Which instrument is used to measure current in a circuit?

    <p>Ammeter (D)</p> Signup and view all the answers

    When an object gains electrons, what type of charge does it acquire?

    <p>Negative (C)</p> Signup and view all the answers

    What happens to the resistance of a wire if its length increases?

    <p>Resistance increases (B)</p> Signup and view all the answers

    Which component is connected in series to measure current in a circuit?

    <p>Ammeter (A)</p> Signup and view all the answers

    What type of current flows in only one direction at a constant value?

    <p>Direct current (D)</p> Signup and view all the answers

    What happens when a magnetic substance is placed near a south pole?

    <p>A north pole is induced on the magnetic substance (C)</p> Signup and view all the answers

    How can de-magnetization be achieved for a magnet?

    <p>Heating till red hot (D)</p> Signup and view all the answers

    What happens to the strength of the magnetic field as the current passing through a wire increases?

    <p>The strength of the field increases (C)</p> Signup and view all the answers

    What effect does placing a piece of steel inside a wire coil have on the magnetism?

    <p>Strengthens the magnetism of the coil and steel (C)</p> Signup and view all the answers

    Why does a piece of steel retain some magnetism even after the current is switched off?

    <p>Because steel is magnetically hard (A)</p> Signup and view all the answers

    What happens when a piece of iron is placed inside a wire coil?

    <p>It makes an even stronger magnet when current is switched on (A)</p> Signup and view all the answers

    What causes the Earth to have day and night?

    <p>Earth's rotation around its own axis (D)</p> Signup and view all the answers

    Which factor can make an electromagnet stronger?

    <p>Increasing the number of turns on the coil (A)</p> Signup and view all the answers

    What motion of the Earth causes the creation of different seasons?

    <p>Earth's axial tilt towards and away from the Sun (D)</p> Signup and view all the answers

    Why does the Moon appear to change shape?

    <p>Movement around the Earth (B)</p> Signup and view all the answers

    How can an electromagnet's polarity be reversed?

    <p>Reversing the battery to change the current direction (C)</p> Signup and view all the answers

    What is responsible for creating day and night on Earth?

    <p>Earth's rotation around its own axis (C)</p> Signup and view all the answers

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