Gr 8 Natural Sciences Term Test 3
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Questions and Answers

What is responsible for the resistance against the movement of an object resulting from its contact with another object?

  • Neutrons
  • Protons
  • Friction (correct)
  • Electrons

    • What happens to an object when it loses electrons due to friction?

  • It becomes neutrally charged
  • It becomes positively charged (correct)
  • It remains unchanged
  • It becomes negatively charged

    • What is the normal state of an atom?

  • Neutrally charged (correct)
  • Unstable
  • Positively charged
  • Negatively charged

    • What is the result of two objects with opposite charges coming together?

    <p>They attract each other</p> Signup and view all the answers

    What is the charge of neutrons?

    <p>No charge</p> Signup and view all the answers

    What is the cause of static electricity?

    <p>Electrons transferring from one object to another</p> Signup and view all the answers

    What happens when two objects with the same charge interact?

    <p>They repel each other</p> Signup and view all the answers

    What is the result of combing your hair with a plastic comb?

    <p>Your hair stands on end and produces crackling sounds</p> Signup and view all the answers

    What is the primary function of a battery in a circuit?

    <p>To provide energy for the current</p> Signup and view all the answers

    What happens to the flow of current when a switch is open?

    <p>The current stops flowing</p> Signup and view all the answers

    What is the purpose of a light bulb in a circuit?

    <p>To act as a load and convert electrical energy into light energy</p> Signup and view all the answers

    What is the difference between a series circuit and a parallel circuit?

    <p>A series circuit has a single path, while a parallel circuit has multiple paths</p> Signup and view all the answers

    What is the purpose of a resistor in a circuit?

    <p>To convert electrical energy into heat energy</p> Signup and view all the answers

    What is represented by a pair of parallel lines in a circuit diagram?

    <p>A cell or battery</p> Signup and view all the answers

    What happens when a component fails in a series circuit?

    <p>The entire circuit is broken</p> Signup and view all the answers

    What is the function of wires in a circuit?

    <p>To conduct current between components</p> Signup and view all the answers

    What is the rating for AAA, AA, C, and D cells?

    <p>1.5V</p> Signup and view all the answers

    What is the unit of measurement for resistance?

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

    What is the purpose of electroplating?

    <p>To improve the appearance, durability, and resistance to corrosion of an object</p> Signup and view all the answers

    What is the characteristic of electric current in a series circuit?

    <p>Current is the same at all points in the circuit</p> Signup and view all the answers

    What happens when more resistors are added in series?

    <p>Total resistance of the circuit increases</p> Signup and view all the answers

    What is the unit of measurement for electric current?

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

    What is the purpose of an ammeter?

    <p>To measure the electric current in a circuit</p> Signup and view all the answers

    What happens when more cells are connected in series?

    <p>Total voltage increases</p> Signup and view all the answers

    What is the characteristic of a parallel circuit?

    <p>There are multiple pathways for the electric current to follow</p> Signup and view all the answers

    What is the result of closing a circuit?

    <p>Electrons start moving simultaneously</p> Signup and view all the answers

    What is the symbol for an ammeter in a circuit diagram?

    <p>A circle with the letter 'A' inside it</p> Signup and view all the answers

    Why does an ammeter have low resistance?

    <p>To not significantly affect the current flowing through the circuit</p> Signup and view all the answers

    What is common about the voltage across each component in a parallel circuit?

    <p>It is the same</p> Signup and view all the answers

    What happens to the total resistance of a circuit when more resistors are added in parallel?

    <p>It decreases</p> Signup and view all the answers

    What is the total current supplied by the battery in a parallel circuit?

    <p>The sum of the currents through each branch</p> Signup and view all the answers

    What is a characteristic of LEDs?

    <p>They do not have a filament and are energy efficient</p> Signup and view all the answers

    What is an application of LEDs?

    <p>Used in various electronic applications such as electronic timepieces, televisions, and home lighting</p> Signup and view all the answers

    What is the result of adding more cells in parallel?

    <p>The overall voltage of the circuit remains the same</p> Signup and view all the answers

    What is true about the current in parallel branches if they have identical components?

    <p>The current will divide equally among the branches</p> Signup and view all the answers

    What is the energy conversion process in LEDs?

    <p>Electrical energy is converted directly into light energy</p> Signup and view all the answers

    What is the primary benefit of LEDs over other light sources?

    <p>They provide more light per unit of electricity consumed.</p> Signup and view all the answers

    What is a difference between LEDs and incandescent light bulbs?

    <p>LEDs produce very little heat and consume less electricity than incandescent light bulbs</p> Signup and view all the answers

    What is an example of a luminous object?

    <p>The Sun</p> Signup and view all the answers

    Why are LEDs more efficient than incandescent light bulbs?

    <p>They convert a significant portion of electrical energy into light energy</p> Signup and view all the answers

    What is the term for the transfer of energy through space as electromagnetic waves?

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

    How does light travel through space?

    <p>In straight lines</p> Signup and view all the answers

    What is the purpose of the pinhole camera activity?

    <p>To understand how light travels</p> Signup and view all the answers

    What is the range of wavelengths of light that are visible to the human eye?

    <p>Visible spectrum</p> Signup and view all the answers

    What is the color with the longest wavelength and lowest frequency in the visible spectrum?

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

    What happens when the colors of the visible spectrum are combined?

    <p>They form white light</p> Signup and view all the answers

    What is the term for the process of separating a wave, such as light, into its constituent parts?

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

    What is the speed at which light travels?

    <p>300,000 kilometers per second</p> Signup and view all the answers

    What is the purpose of a sundial?

    <p>To tell time</p> Signup and view all the answers

    What happens when light hits an opaque object?

    <p>It casts a shadow</p> Signup and view all the answers

    What is the purpose of a filter?

    <p>To allow specific colors of light to pass through</p> Signup and view all the answers

    What is absorption of light?

    <p>The process by which a material takes in light energy</p> Signup and view all the answers

    Why do black surfaces become hotter than white surfaces when exposed to sunlight?

    <p>Because they absorb more light energy</p> Signup and view all the answers

    What happens to light when it hits a mirror?

    <p>It is reflected</p> Signup and view all the answers

    Why do ladybirds' black spots appear black?

    <p>Because they absorb all colors of light</p> Signup and view all the answers

    What is the purpose of a red filter?

    <p>To allow only red light to pass through</p> Signup and view all the answers

    Why do white objects appear white?

    <p>Because they reflect all colors of light</p> Signup and view all the answers

    What happens when light hits a translucent object?

    <p>It passes through partially</p> Signup and view all the answers

    What is the function of rods in the eye?

    <p>To detect light and dark changes</p> Signup and view all the answers

    What happens to light when it enters a different medium at an angle?

    <p>It changes direction</p> Signup and view all the answers

    What is the purpose of the optic nerve?

    <p>To transmit electrical impulses to the brain</p> Signup and view all the answers

    What is the term for the bending of light as it passes from one medium to another?

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

    What determines how much a medium slows down light?

    <p>Optical density</p> Signup and view all the answers

    What is the result of light traveling from a less dense medium to a denser medium?

    <p>It slows down</p> Signup and view all the answers

    What is the purpose of cone cells in the retina?

    <p>To detect color</p> Signup and view all the answers

    What happens to white light when it passes through a prism?

    <p>It is refracted and split into its component colors</p> Signup and view all the answers

    What is the purpose of the lens in the eye?

    <p>To focus light onto the retina</p> Signup and view all the answers

    What is the result of placing a straw in a glass of water?

    <p>It appears to be bent</p> Signup and view all the answers

    What happens when you rub a balloon on your hair?

    <p>Electrons transfer from your hair to the balloon, making your hair positively charged and the balloon negatively charged.</p> Signup and view all the answers

    What is the purpose of earthing?

    <p>To safely discharge extra electrons from an object into the Earth.</p> Signup and view all the answers

    What is an electric current?

    <p>The movement of electric charge through a closed, conducting circuit.</p> Signup and view all the answers

    What is the role of a conductor in an electric circuit?

    <p>To allow the flow of electric current.</p> Signup and view all the answers

    What is the function of a switch in an electric circuit?

    <p>To control the flow of electric current.</p> Signup and view all the answers

    What is the purpose of a resistor in an electric circuit?

    <p>To convert electrical energy into heat.</p> Signup and view all the answers

    What is the difference between a conductor and an insulator?

    <p>Conductors allow the flow of electric current, while insulators do not.</p> Signup and view all the answers

    What is the purpose of a Van de Graaff generator?

    <p>To generate a large electric charge on a metal dome.</p> Signup and view all the answers

    What is the purpose of an electroscope?

    <p>To detect the presence and type of charge on an object.</p> Signup and view all the answers

    What is a necessary component of an electric circuit?

    <p>A source of energy.</p> Signup and view all the answers

    What symbol is used to represent a battery in a circuit diagram?

    <p>Multiple sets of parallel lines</p> Signup and view all the answers

    What is the function of a fuse in an electrical circuit?

    <p>To protect the circuit from overheating</p> Signup and view all the answers

    What happens when an electric current flows through a resistor?

    <p>It converts electrical energy into heat</p> Signup and view all the answers

    What is the purpose of a circuit breaker in a modern home?

    <p>To protect the circuit from damage by stopping the current flow during overloads or short circuits</p> Signup and view all the answers

    What is the principle behind the operation of electromagnets?

    <p>The magnetic effect of electric current</p> Signup and view all the answers

    What is the result of electrolysis of copper chloride solution?

    <p>The separation of copper and chlorine</p> Signup and view all the answers

    What is the function of the filament in a light bulb?

    <p>To convert electrical energy into heat</p> Signup and view all the answers

    What is the purpose of the heating element in a kettle?

    <p>To convert electrical energy into heat</p> Signup and view all the answers

    What is represented by a circle with a cross inside in a circuit diagram?

    <p>A light bulb</p> Signup and view all the answers

    What is the effect of electric current on a solution during electrolysis?

    <p>It breaks down the solution into its component elements</p> Signup and view all the answers

    What occurs when light passes through a prism?

    <p>Light is split into its constituent colors</p> Signup and view all the answers

    What is the longest wavelength of visible light?

    <p>700 nanometers</p> Signup and view all the answers

    What type of light is used in forensics and to sterilize medical equipment?

    <p>Ultraviolet light</p> Signup and view all the answers

    What is the term for substances that do not transmit light?

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

    What happens to light when it hits an opaque surface?

    <p>It is reflected by the surface</p> Signup and view all the answers

    What is the frequency of a wave?

    <p>The number of waves that pass a point in one second</p> Signup and view all the answers

    What is the purpose of a prism in an experiment?

    <p>To split light into its constituent colors</p> Signup and view all the answers

    What type of light is felt as heat?

    <p>Infrared light</p> Signup and view all the answers

    What is the term for substances that transmit some light but not enough to see through clearly?

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

    What is the result of light passing through a transparent substance?

    <p>The light passes through the substance with little absorption or reflection</p> Signup and view all the answers

    What occurs when light enters a raindrop?

    <p>It is refracted and dispersed</p> Signup and view all the answers

    What is the purpose of a converging lens?

    <p>To focus light rays to a point</p> Signup and view all the answers

    What type of lens is used to correct near-sightedness?

    <p>Diverging lens (biconcave)</p> Signup and view all the answers

    What happens to light as it exits a raindrop?

    <p>It is refracted again</p> Signup and view all the answers

    What is the purpose of the normal line in understanding reflection?

    <p>To draw an imaginary line perpendicular to the surface at the point of incidence</p> Signup and view all the answers

    What is an application of lenses?

    <p>Correcting vision and magnifying images</p> Signup and view all the answers

    What is the law of reflection?

    <p>The angle of incidence is equal to the angle of reflection</p> Signup and view all the answers

    What is the result of refraction and dispersion in a raindrop?

    <p>A rainbow</p> Signup and view all the answers

    What is the function of the cornea in the eye?

    <p>To focus light</p> Signup and view all the answers

    What is the process of light entering the eye?

    <p>Light entry</p> Signup and view all the answers

    What is the function of photoreceptor cells in the retina?

    <p>To detect light</p> Signup and view all the answers

    What is the result of light reflecting off a smooth surface?

    <p>A clear and focused image</p> Signup and view all the answers

    What is the function of the iris in the eye?

    <p>To change the pupil's size</p> Signup and view all the answers

    What is the angle between the incident ray and the normal line?

    <p>Angle of incidence</p> Signup and view all the answers

    What is the result of light reflecting off a rough surface?

    <p>A diffuse and unclear reflection</p> Signup and view all the answers

    What is the purpose of the lens in the eye?

    <p>To focus light</p> Signup and view all the answers

    When a comb is dragged through hair, what happens to the electrons?

    <p>They move from the hair to the comb</p> Signup and view all the answers

    What is the result of an object gaining more electrons than protons?

    <p>The object becomes negatively charged</p> Signup and view all the answers

    Why do objects with the same charge repel each other?

    <p>Because they have the same type of charge</p> Signup and view all the answers

    What is the term for the resistance against the movement of an object resulting from its contact with another object?

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

    What happens when two objects with opposite charges interact?

    <p>They attract each other</p> Signup and view all the answers

    What is the normal state of an atom?

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

    What is the result of combing your hair with a plastic comb?

    <p>Your hair becomes negatively charged</p> Signup and view all the answers

    What is the purpose of friction in the context of static electricity?

    <p>To transfer electrons</p> Signup and view all the answers

    What happens when there is a significant build-up of charge on an object?

    <p>A spark is produced through contact or across an air gap.</p> Signup and view all the answers

    What is the purpose of earthing an object?

    <p>To safely discharge extra electrons from the object.</p> Signup and view all the answers

    What is an electric current?

    <p>The movement of electric charge through a closed, conducting circuit.</p> Signup and view all the answers

    What is the function of a conductor in a circuit?

    <p>To allow the flow of electric current.</p> Signup and view all the answers

    What is the purpose of a switch in a circuit?

    <p>To control the flow of current in the circuit.</p> Signup and view all the answers

    What is the purpose of a load in a circuit?

    <p>To use the electrical energy.</p> Signup and view all the answers

    What is a characteristic of metals?

    <p>Electrons are free to move and are not bound to any specific atom.</p> Signup and view all the answers

    What is the function of an electroscope?

    <p>To detect the presence and type of charge on an object.</p> Signup and view all the answers

    What is a Van de Graaff generator used for?

    <p>To generate a large electric charge on a metal dome.</p> Signup and view all the answers

    What is required for an electric current to flow?

    <p>A closed, conducting circuit.</p> Signup and view all the answers

    What is the main purpose of electroplating?

    <p>To improve the appearance and durability of a metal object</p> Signup and view all the answers

    In a series circuit, what happens to the total resistance when more resistors are added?

    <p>It increases</p> Signup and view all the answers

    What is the function of an ammeter in a circuit?

    <p>To measure the current of a circuit</p> Signup and view all the answers

    In a parallel circuit, what is true about the voltage across each component?

    <p>It is the same for each component</p> Signup and view all the answers

    What happens to the current in a series circuit when more resistors are added?

    <p>It decreases</p> Signup and view all the answers

    What is the characteristic of electric current in a series circuit?

    <p>It has a single pathway</p> Signup and view all the answers

    What is the purpose of connecting cells in series?

    <p>To increase the total voltage</p> Signup and view all the answers

    Why does an ammeter have low resistance?

    <p>So it can measure current accurately</p> Signup and view all the answers

    What is the main difference between a series circuit and a parallel circuit?

    <p>The pathway of the electric current in the circuit</p> Signup and view all the answers

    What happens when a component fails in a series circuit?

    <p>The entire circuit is affected</p> Signup and view all the answers

    What is the primary benefit of LEDs over other light sources?

    <p>They provide more light per unit of electricity consumed and generate less heat</p> Signup and view all the answers

    What is the term for objects that emit light?

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

    How does light travel through space?

    <p>In straight lines</p> Signup and view all the answers

    What is the range of wavelengths of light that are visible to the human eye?

    <p>Visible spectrum</p> Signup and view all the answers

    What is the color with the longest wavelength and lowest frequency in the visible spectrum?

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

    What happens when the colors of the visible spectrum are combined?

    <p>They form white light</p> Signup and view all the answers

    What is the term for the process of separating a wave, such as light, into its constituent parts?

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

    What is the speed at which light travels?

    <p>300,000 kilometers per second</p> Signup and view all the answers

    What is the purpose of the pinhole camera activity?

    <p>To understand how light travels in straight lines</p> Signup and view all the answers

    What is an example of a luminous object?

    <p>All of the above</p> Signup and view all the answers

    What is the function of the cornea in the human eye?

    <p>To focus light onto the retina</p> Signup and view all the answers

    What is the law of reflection?

    <p>The angle of incidence is equal to the angle of reflection</p> Signup and view all the answers

    What is the purpose of the normal line in understanding reflection?

    <p>To draw an imaginary line perpendicular to the surface at the point of incidence</p> Signup and view all the answers

    What is the term for the light-sensitive cells in the retina?

    <p>Photoreceptor cells</p> Signup and view all the answers

    What is the function of the pupil in the human eye?

    <p>To open and close to regulate light entry</p> Signup and view all the answers

    What is the characteristic of a smooth surface in terms of reflection?

    <p>It reflects light uniformly, creating a clear image</p> Signup and view all the answers

    What is the purpose of the retina in the human eye?

    <p>To convert light into electrical signals</p> Signup and view all the answers

    What is the angle of incidence?

    <p>The angle between the incident ray and the normal line</p> Signup and view all the answers

    What is the result of reflection off a rough surface?

    <p>A diffuse and unclear reflection</p> Signup and view all the answers

    What is the term for the process of light entering the eye?

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

    What occurs when light enters a raindrop, creating a rainbow?

    <p>Dispersion and reflection</p> Signup and view all the answers

    What is the purpose of a converging lens?

    <p>To focus light rays to a point</p> Signup and view all the answers

    What is used to correct near-sightedness?

    <p>Diverging lenses</p> Signup and view all the answers

    What is the main application of lenses?

    <p>To correct vision and magnify images</p> Signup and view all the answers

    What type of lens is used to correct far-sightedness?

    <p>Converging lens</p> Signup and view all the answers

    What is the process by which light is separated into its constituent parts?

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

    What is the primary function of a switch in a circuit?

    <p>To control the flow of current</p> Signup and view all the answers

    What happens when a circuit is broken?

    <p>The current stops flowing through the circuit</p> Signup and view all the answers

    What is the purpose of building a simple circuit?

    <p>To demonstrate the concept of open and closed circuits</p> Signup and view all the answers

    What is the difference between a cell and a battery?

    <p>A battery is a group of cells connected together</p> Signup and view all the answers

    What is the purpose of a resistor in a circuit?

    <p>To convert electrical energy into heat energy</p> Signup and view all the answers

    What is the characteristic of a series circuit?

    <p>A single path for the current to flow</p> Signup and view all the answers

    What happens when a component fails in a parallel circuit?

    <p>The current flows through the other paths</p> Signup and view all the answers

    What is the purpose of wires in a circuit?

    <p>To conduct the current between components</p> Signup and view all the answers

    What is the result of closing a circuit?

    <p>The light bulb lights up</p> Signup and view all the answers

    What is the primary benefit of understanding electric circuits?

    <p>To explore more complex electrical systems and practical applications</p> Signup and view all the answers

    What is the main characteristic of a parallel circuit?

    <p>Components are connected across common points or junctions, creating multiple paths for the current.</p> Signup and view all the answers

    What happens to the total resistance of a circuit when more resistors are added in parallel?

    <p>The total resistance decreases.</p> Signup and view all the answers

    What is the relationship between the total current and branch currents in a parallel circuit?

    <p>A1 = A2 + A3</p> Signup and view all the answers

    What is a characteristic of LEDs?

    <p>They emit light through electroluminescence.</p> Signup and view all the answers

    What happens to the current in parallel branches if they have identical components?

    <p>The current will divide equally among the branches.</p> Signup and view all the answers

    What is the purpose of a light bulb in a circuit?

    <p>To convert electrical energy into light energy.</p> Signup and view all the answers

    What is the result of adding more cells in parallel?

    <p>The total current of the circuit remains the same.</p> Signup and view all the answers

    What is the energy conversion process in LEDs?

    <p>Electrical energy → Light energy</p> Signup and view all the answers

    What is the primary benefit of LEDs over other light sources?

    <p>They consume less electricity.</p> Signup and view all the answers

    What is a difference between LEDs and incandescent light bulbs?

    <p>Incandescent bulbs have a filament, while LEDs do not.</p> Signup and view all the answers

    What is the primary reason why we see a rainbow when light passes through raindrops in the atmosphere?

    <p>Different wavelengths of light bend by different amounts</p> Signup and view all the answers

    What is the term for the distance between two corresponding points on consecutive waves of light?

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

    What type of electromagnetic wave has a shorter wavelength and higher frequency than visible light?

    <p>Ultraviolet (UV) Light</p> Signup and view all the answers

    What is the term for substances that do not transmit light, and instead reflect or absorb it?

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

    What happens when light hits a transparent substance?

    <p>It passes through the substance with little absorption or reflection</p> Signup and view all the answers

    What is an example of a translucent substance?

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

    What is the term for the process of separating a wave, such as light, into its constituent parts?

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

    What is the range of wavelengths of light that are visible to the human eye?

    <p>400-700 nanometers</p> Signup and view all the answers

    What is the color with the shortest wavelength and highest frequency in the visible spectrum?

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

    What is the result of combining the colors of the visible spectrum?

    <p>White light</p> Signup and view all the answers

    What is the function of a fuse in an electrical circuit?

    <p>To protect electrical circuits from overheating</p> Signup and view all the answers

    What is the symbol for a resistor in a circuit diagram?

    <p>A zigzag line</p> Signup and view all the answers

    What is the purpose of a variable resistor in a circuit?

    <p>To increase or decrease the current in a circuit</p> Signup and view all the answers

    What happens when an electric current flows through a resistor?

    <p>The resistor converts electrical energy into heat</p> Signup and view all the answers

    What is the term for the process of passing an electric current through a liquid or solution to break it down into its component elements?

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

    What is the purpose of a circuit breaker in an electrical circuit?

    <p>To protect electrical circuits from damage by stopping the current flow during overloads or short circuits</p> Signup and view all the answers

    What is the effect of an electric current on the filament in a light bulb?

    <p>It causes the filament to heat up and emit light</p> Signup and view all the answers

    What is the function of an electromagnet in a device such as an electric bell?

    <p>To create a magnetic field that vibrates a diaphragm to produce sound</p> Signup and view all the answers

    What is the result of the heating effect of an electric current?

    <p>The conversion of electrical energy into heat</p> Signup and view all the answers

    What is the purpose of a switch in an electrical circuit?

    <p>To control the flow of current in a circuit</p> Signup and view all the answers

    What is the primary purpose of using a transparent object as a filter?

    <p>To allow specific colors of light to pass through</p> Signup and view all the answers

    What happens when light hits an object with a transparent surface?

    <p>The light passes through the object</p> Signup and view all the answers

    What is the main difference between a black object and a white object?

    <p>Black objects absorb all colors of light, while white objects reflect all colors of light</p> Signup and view all the answers

    Why do black clothes make you feel hotter on a sunny day?

    <p>Because black clothes absorb more light and convert it into heat</p> Signup and view all the answers

    What is the purpose of using a red filter in photography?

    <p>To absorb all colors of light except red</p> Signup and view all the answers

    What is the result of an object absorbing all colors of light?

    <p>The object appears black</p> Signup and view all the answers

    What is the principle behind the use of shadows to tell time with a sundial?

    <p>The shadow of the sundial's gnomon moves across its marked surface as the Sun moves across the sky</p> Signup and view all the answers

    What is the function of a mirror?

    <p>To reflect light with minimal absorption</p> Signup and view all the answers

    Why are solar panels usually black?

    <p>Because black surfaces absorb the maximum amount of light</p> Signup and view all the answers

    What is the result of light hitting a translucent substance?

    <p>The light passes through the substance, but is scattered</p> Signup and view all the answers

    What type of photoreceptor cells are sensitive to shape, movement, and light and dark changes?

    <p>Rod cells</p> Signup and view all the answers

    What happens to light when it travels from one medium to another?

    <p>It changes direction</p> Signup and view all the answers

    What is the purpose of the lens in the eye?

    <p>To focus light onto the retina</p> Signup and view all the answers

    What is the name of the process by which light is separated into its component colors?

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

    What determines how much a medium slows down light?

    <p>Optical density</p> Signup and view all the answers

    What appears to happen to a straw in a glass of water?

    <p>It appears bent</p> Signup and view all the answers

    What is the function of the optic nerve?

    <p>To transmit signals to the brain</p> Signup and view all the answers

    What is the term for the bending of light as it passes from one medium to another?

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

    What determines the color of an object?

    <p>The wavelength of light it reflects</p> Signup and view all the answers

    What happens to light when it enters a different medium at an angle?

    <p>It changes direction</p> Signup and view all the answers

    What occurs when an object gains electrons due to friction?

    <p>The object becomes negatively charged.</p> Signup and view all the answers

    What is the result of two objects with the same charge interacting?

    <p>They repel each other.</p> Signup and view all the answers

    What causes an atom to be neutral?

    <p>An equal number of protons and electrons.</p> Signup and view all the answers

    What is the purpose of friction in the context of static electricity?

    <p>To transfer electrons between objects.</p> Signup and view all the answers

    What is the term for the forces that hold the nucleus of an atom together?

    <p>Strong forces.</p> Signup and view all the answers

    What is the net result of combing your hair with a plastic comb?

    <p>Electrons are transferred from the hair to the comb.</p> Signup and view all the answers

    What is the characteristic of an object that has more protons than electrons?

    <p>It is positively charged.</p> Signup and view all the answers

    What is the reason behind the attraction between two objects with opposite charges?

    <p>Opposite charges attract each other.</p> Signup and view all the answers

    What is the primary function of a fuse in an electrical circuit?

    <p>To protect the circuit from overheating</p> Signup and view all the answers

    What is the effect of electric current on a resistor?

    <p>It converts electrical energy into heat</p> Signup and view all the answers

    What is the purpose of electrolysis in electroplating?

    <p>To purify metals</p> Signup and view all the answers

    What is the effect of an electric current on a light bulb?

    <p>It converts electrical energy into light</p> Signup and view all the answers

    What is the purpose of a circuit breaker in an electrical circuit?

    <p>To protect the circuit from overheating</p> Signup and view all the answers

    What is the effect of electric current on a kettle?

    <p>It converts electrical energy into heat</p> Signup and view all the answers

    What is the purpose of a resistor in a circuit diagram?

    <p>To represent a resistor or resistance in the circuit</p> Signup and view all the answers

    What is the effect of electric current on a magnet?

    <p>It creates a magnetic field around the magnet</p> Signup and view all the answers

    What is the purpose of a variable resistor in a circuit?

    <p>To vary the resistance in the circuit</p> Signup and view all the answers

    What is the effect of electric current on a solution?

    <p>It causes a chemical reaction in the solution</p> Signup and view all the answers

    What is the primary reason why shadows are created?

    <p>Because light cannot pass through opaque objects</p> Signup and view all the answers

    What is the purpose of using a red filter in photography?

    <p>To transmit only red light and absorb other colors</p> Signup and view all the answers

    What happens to light energy when it hits a black object?

    <p>It is absorbed and converted into heat</p> Signup and view all the answers

    What is the reason why solar panels are usually black?

    <p>Because black surfaces absorb the maximum amount of light</p> Signup and view all the answers

    What is the difference between a blackboard and a whiteboard?

    <p>A blackboard absorbs most of the light, while a whiteboard reflects most of the light</p> Signup and view all the answers

    What is the characteristic of light that allows us to see objects and create mirror images?

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

    What is the reason why wearing black clothes on a sunny day can make you feel hotter?

    <p>Because black clothes absorb most of the sunlight</p> Signup and view all the answers

    What is the term for the process by which a material takes in light energy?

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

    What is the characteristic of light that allows it to travel through space?

    <p>Traveling in straight lines</p> Signup and view all the answers

    What is the purpose of using a sundial?

    <p>To tell time</p> Signup and view all the answers

    What is the primary function of the normal line in the context of reflection?

    <p>To draw a perpendicular line to the surface at the point of incidence</p> Signup and view all the answers

    What type of surface would produce a diffuse reflection?

    <p>Rough surface</p> Signup and view all the answers

    What is the term for the bending of light as it passes from one medium to another?

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

    What is the primary function of the lens in the eye?

    <p>To focus light</p> Signup and view all the answers

    What is the term for the light-sensitive cells in the retina?

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

    What is the result of the law of reflection?

    <p>The angle of incidence is equal to the angle of reflection</p> Signup and view all the answers

    What is the primary function of the cornea?

    <p>To focus light</p> Signup and view all the answers

    What is the purpose of the pupil?

    <p>To regulate the amount of light that enters the eye</p> Signup and view all the answers

    What is the term for the process of light entering the eye?

    <p>Light entry</p> Signup and view all the answers

    What is the primary function of the retina?

    <p>To convert light into electrical signals</p> Signup and view all the answers

    What occurs when light enters a raindrop?

    <p>It refracts and is split into its component colors.</p> Signup and view all the answers

    What is the purpose of a converging lens?

    <p>To bend light rays inward to a focal point.</p> Signup and view all the answers

    What type of lens is used to correct near-sightedness?

    <p>Diverging lens (biconcave)</p> Signup and view all the answers

    What happens to light as it exits a raindrop?

    <p>It refracts and is split into its component colors.</p> Signup and view all the answers

    What is the main application of lenses?

    <p>To correct vision and magnify images.</p> Signup and view all the answers

    What is the result of the refraction and reflection of light in a raindrop?

    <p>A rainbow with its component colors.</p> Signup and view all the answers

    What is the primary function of a closed circuit?

    <p>To enable the flow of electric current.</p> Signup and view all the answers

    What is the effect on a parallel circuit if one component fails?

    <p>The current can still flow through the other paths.</p> Signup and view all the answers

    What is the purpose of a switch in a circuit?

    <p>To control the flow of current.</p> Signup and view all the answers

    What is the advantage of using a variable resistor?

    <p>It enables the dynamic control of current flow.</p> Signup and view all the answers

    What is the function of wires in a circuit?

    <p>To conduct the current between the components.</p> Signup and view all the answers

    What is true about the flow of current in a series circuit?

    <p>It is affected by the resistance of each component.</p> Signup and view all the answers

    What is the effect of connecting more cells in series?

    <p>The total voltage increases.</p> Signup and view all the answers

    What is true about the current in a parallel circuit?

    <p>It is not affected by the failure of one component.</p> Signup and view all the answers

    What is the purpose of a resistor in a circuit?

    <p>To oppose the flow of electric current.</p> Signup and view all the answers

    What is the effect of adding more resistors in parallel?

    <p>The total resistance decreases.</p> Signup and view all the answers

    In a parallel circuit, what is the relationship between the total current and the current through each branch?

    <p>The total current is the sum of the currents through each branch.</p> Signup and view all the answers

    What is the primary benefit of using LEDs over incandescent light bulbs?

    <p>LEDs are more efficient and produce less heat.</p> Signup and view all the answers

    What is the primary reason for electroplating a metal object?

    <p>To improve the object's appearance, durability, and resistance to corrosion</p> Signup and view all the answers

    What happens to the total resistance of a circuit when more resistors are added in parallel?

    <p>The total resistance decreases.</p> Signup and view all the answers

    What is the key difference between a series circuit and a parallel circuit?

    <p>The pathway of electric current in the circuit</p> Signup and view all the answers

    What is the characteristic of electric current in a parallel circuit?

    <p>The current through each branch is the same.</p> Signup and view all the answers

    What is the term for the process of converting electrical energy directly into light energy in LEDs?

    <p>Electroluminescence.</p> Signup and view all the answers

    What happens to the total resistance of a series circuit when more resistors are added?

    <p>It increases</p> Signup and view all the answers

    What is the purpose of an ammeter in a circuit?

    <p>To measure the electric current in the circuit</p> Signup and view all the answers

    What happens to the current strength when more cells are added in parallel?

    <p>The current strength remains the same.</p> Signup and view all the answers

    What is the result of adding more resistors in parallel to a circuit?

    <p>The total current increases.</p> Signup and view all the answers

    What happens to the electric current in a series circuit when more cells are added?

    <p>It increases, provided the total resistance remains constant</p> Signup and view all the answers

    What is the characteristic of the voltage across each component in a parallel circuit?

    <p>The voltage across each component is the same.</p> Signup and view all the answers

    What is a characteristic of electron movement in a conductor?

    <p>Electrons move freely within the metal</p> Signup and view all the answers

    What is the symbol for an ammeter in a circuit diagram?

    <p>A circle with the letter 'A' inside</p> Signup and view all the answers

    What is the benefit of using parallel circuits over series circuits?

    <p>Parallel circuits are less prone to component failure.</p> Signup and view all the answers

    Why does an ammeter have low resistance?

    <p>So that it does not significantly affect the current flowing through the circuit</p> Signup and view all the answers

    What is the purpose of using multiple exits in a school hall?

    <p>To allow students to exit more quickly and efficiently.</p> Signup and view all the answers

    What is a characteristic of a parallel circuit?

    <p>There is more than one pathway for electric current</p> Signup and view all the answers

    What happens when a component fails in a series circuit?

    <p>The circuit is broken and the current stops flowing</p> Signup and view all the answers

    What is the primary reason for the separation of colors when light passes through a prism?

    <p>Due to the difference in the wavelengths of the colors</p> Signup and view all the answers

    What is the primary reason why LEDs are preferred in many applications?

    <p>They provide more light per unit of electricity consumed and generate less heat</p> Signup and view all the answers

    What type of waves are used in forensics and to sterilize medical equipment?

    <p>Ultraviolet (UV) light</p> Signup and view all the answers

    What happens to light when it hits a translucent substance?

    <p>It is scattered in different directions</p> Signup and view all the answers

    What is the term for objects that emit light?

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

    What is the process of separating a wave, such as light, into its constituent parts?

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

    What is the shortest wavelength and highest frequency light in the visible spectrum?

    <p>Violet light</p> Signup and view all the answers

    What is the purpose of the activity involving a prism and a light source?

    <p>To investigate the visible spectrum</p> Signup and view all the answers

    What is the color with the shortest wavelength and highest frequency in the visible spectrum?

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

    What is the term for the distance between two corresponding points on consecutive waves?

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

    What is the approximate time it takes for light to travel from the Sun to the Earth?

    <p>8 minutes</p> Signup and view all the answers

    What is the purpose of lining the inside of the pinhole camera box with black paper?

    <p>To minimize reflections</p> Signup and view all the answers

    What type of electromagnetic waves are used for cooking and satellite transmissions?

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

    What is the characteristic of light when it passes through a transparent substance?

    <p>It passes through with little absorption or reflection</p> Signup and view all the answers

    What is the result of combining the colors of the visible spectrum?

    <p>White light</p> Signup and view all the answers

    What is the term for the movement of light through space?

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

    What is the process of separating a wave, such as light, into its constituent parts?

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

    What is the speed at which light travels?

    <p>300,000 kilometers per second</p> Signup and view all the answers

    What happens when light hits an opaque substance?

    <p>It is absorbed or reflected</p> Signup and view all the answers

    What is the term for objects that do not emit their own light?

    <p>Non-Luminous</p> Signup and view all the answers

    What is the primary reason for the buildup of charge on an object through friction?

    <p>The transfer of electrons from one object to another</p> Signup and view all the answers

    What is the purpose of earthing an object?

    <p>To safely discharge excess electrons from the object</p> Signup and view all the answers

    What is the function of a Van de Graaff generator?

    <p>To generate a large electric charge on a metal dome</p> Signup and view all the answers

    What is the characteristic of electric current in a metal?

    <p>The flow of electric charge is carried by delocalized electrons</p> Signup and view all the answers

    What is the purpose of a conductor in an electric circuit?

    <p>To allow the flow of electric current through the circuit</p> Signup and view all the answers

    What is the result of connecting a load to a circuit?

    <p>The circuit becomes closed and current can flow</p> Signup and view all the answers

    What is the primary function of a switch in an electric circuit?

    <p>To control the flow of current through the circuit</p> Signup and view all the answers

    What is the difference between a conductor and an insulator?

    <p>A conductor allows the flow of electric current, while an insulator does not</p> Signup and view all the answers

    What is the purpose of a simple circuit diagram?

    <p>To visualize the components and their connections in the circuit</p> Signup and view all the answers

    What is the result of combing your hair with a plastic comb?

    <p>Your hair becomes positively charged</p> Signup and view all the answers

    What is the main function of rods in the human eye?

    <p>To detect light and dark changes, shapes, and movement</p> Signup and view all the answers

    Which structure in the eye controls the amount of light that enters?

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

    What is the process by which light bends as it passes from one medium to another?

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

    Why does light refract when it passes from one medium to another?

    <p>Because of the change in speed</p> Signup and view all the answers

    What is the term for a measure of how much a medium can slow down light?

    <p>Optical density</p> Signup and view all the answers

    What is the result of refraction in a prism?

    <p>Dispersion of light</p> Signup and view all the answers

    What is the purpose of the optic nerve in the process of vision?

    <p>To transmit electrical signals from the eye to the brain</p> Signup and view all the answers

    What is the function of cone cells in the retina?

    <p>To detect different wavelengths of light</p> Signup and view all the answers

    What is the result of placing a straw in a glass of water?

    <p>The straw appears bent</p> Signup and view all the answers

    What is the term for the process of interpreting electrical signals as visual images?

    <p>Brain interpretation</p> Signup and view all the answers

    What is the process that splits white light into its component colors, creating a rainbow?

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

    What type of lens is used to correct near-sightedness?

    <p>Diverging lens</p> Signup and view all the answers

    What is the function of a converging lens?

    <p>To focus light rays to a single point</p> Signup and view all the answers

    What is the purpose of corrective lenses in glasses?

    <p>To correct vision</p> Signup and view all the answers

    What occurs when light enters a raindrop?

    <p>It is refracted</p> Signup and view all the answers

    What is the term for the bending of light as it passes from one medium to another?

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

    What is the result of light being refracted through a triangular prism?

    <p>The light is dispersed into its component colors</p> Signup and view all the answers

    What is the term for the separation of light into its component colors?

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

    What is the purpose of a converging lens in a microscope?

    <p>To focus light rays</p> Signup and view all the answers

    What is the result of light being reflected off the back of a raindrop?

    <p>The light is transmitted back out of the raindrop</p> Signup and view all the answers

    What is the process responsible for creating a rainbow?

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

    What is the function of a converging lens?

    <p>To bend light rays inward</p> Signup and view all the answers

    What type of lens is used to correct near-sightedness?

    <p>Diverging lens</p> Signup and view all the answers

    What is the result of light refraction as it enters a raindrop?

    <p>It is split into its component colors</p> Signup and view all the answers

    What is the purpose of lenses in optical devices?

    <p>All of the above</p> Signup and view all the answers

    What happens to light as it exits a raindrop?

    <p>It is refracted again</p> Signup and view all the answers

    What type of lens is used to correct far-sightedness?

    <p>Converging lens</p> Signup and view all the answers

    What is the result of dispersion in a rainbow?

    <p>Component colors are separated</p> Signup and view all the answers

    What is the purpose of a diverging lens?

    <p>To spread light rays apart</p> Signup and view all the answers

    What is the application of lenses in microscopes?

    <p>To magnify images</p> Signup and view all the answers

    What is the primary reason why rainbows appear in the sky?

    <p>Light from the Sun refracts as it enters a raindrop and reflects off the back of the drop</p> Signup and view all the answers

    What is the main function of a converging lens?

    <p>To bend light rays inward to a focal point</p> Signup and view all the answers

    What type of lens is used to correct near-sightedness?

    <p>Diverging lens (biconcave)</p> Signup and view all the answers

    What is the process by which white light is split into its component colors?

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

    What is the shape of the lenses used to correct far-sightedness?

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

    What is the purpose of lenses in optical devices such as glasses and microscopes?

    <p>To correct vision and magnify images</p> Signup and view all the answers

    What happens to light when it enters a raindrop?

    <p>It refracts and changes direction</p> Signup and view all the answers

    What is the result of the process of refraction and dispersion in a rainbow?

    <p>A range of colors is produced with different wavelengths</p> Signup and view all the answers

    What is the main difference between a converging lens and a diverging lens?

    <p>The direction of bending of light rays</p> Signup and view all the answers

    What is the purpose of a diverging lens?

    <p>To disperse light rays outward</p> Signup and view all the answers

    What is the main reason why rainbows display a band of colors?

    <p>Light is refracted and dispersed as it passes through the raindrop</p> Signup and view all the answers

    What is the purpose of a converging lens?

    <p>To bend light rays inward to a focal point</p> Signup and view all the answers

    What type of lens is used to correct near-sightedness?

    <p>Diverging lens</p> Signup and view all the answers

    What is the result of light refracting through a prism?

    <p>Light is split into its component colors</p> Signup and view all the answers

    What is the purpose of a diverging lens?

    <p>To spread light rays apart</p> Signup and view all the answers

    What is the application of lenses in corrective eyewear?

    <p>To correct vision</p> Signup and view all the answers

    What is the result of light reflecting off the back of a raindrop?

    <p>Light is reflected back</p> Signup and view all the answers

    What is the term for the bending of light as it passes from one medium to another?

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

    What is the purpose of a lens in a microscope?

    <p>To magnify objects</p> Signup and view all the answers

    What is the result of light passing through a converging lens?

    <p>Light is focused to a point</p> Signup and view all the answers

    What is the primary mechanism responsible for the formation of a rainbow?

    <p>Refraction and dispersion</p> Signup and view all the answers

    What is the function of a converging lens?

    <p>To focus light rays to a point</p> Signup and view all the answers

    What type of lens is used to correct near-sightedness?

    <p>Diverging lens</p> Signup and view all the answers

    What is the result of light passing through a triangular prism?

    <p>It is refracted and dispersed</p> Signup and view all the answers

    What is the purpose of lenses in optical devices such as microscopes and telescopes?

    <p>To focus and magnify images</p> Signup and view all the answers

    What is the term for the process of bending light rays?

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

    What is the result of light reflecting off the back of a raindrop?

    <p>It is refracted again</p> Signup and view all the answers

    What type of lens is used to correct far-sightedness?

    <p>Converging lens</p> Signup and view all the answers

    What is the purpose of glasses?

    <p>To correct vision</p> Signup and view all the answers

    What is the result of light passing through a raindrop?

    <p>It is refracted and dispersed</p> Signup and view all the answers

    What is responsible for creating a rainbow?

    <p>All of the above</p> Signup and view all the answers

    What type of lens is used to correct near-sightedness?

    <p>Diverging lens (biconcave)</p> Signup and view all the answers

    What is the primary function of lenses in optical devices?

    <p>To focus or disperse light</p> Signup and view all the answers

    What happens to light as it enters a raindrop?

    <p>It refracts and splits into its component colors</p> Signup and view all the answers

    What type of lens is used to correct far-sightedness?

    <p>Converging lens (biconvex)</p> Signup and view all the answers

    What is the term for the process of separating a wave, such as light, into its constituent parts?

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

    What is the purpose of converging lenses in optical devices?

    <p>To focus light rays to a point</p> Signup and view all the answers

    What is the result of light refraction through a triangular prism?

    <p>The light is separated into its component colors</p> Signup and view all the answers

    What is the application of lenses in devices such as microscopes and telescopes?

    <p>To magnify images</p> Signup and view all the answers

    What is responsible for the separation of light into its component colors in a rainbow?

    <p>All of the above</p> Signup and view all the answers

    What occurs when light from the Sun enters a raindrop?

    <p>It is refracted and split into its component colors</p> Signup and view all the answers

    What is the purpose of a converging lens?

    <p>To bend light rays inward, focusing them to a point</p> Signup and view all the answers

    Which type of lens is used to correct near-sightedness?

    <p>Diverging lens</p> Signup and view all the answers

    What is the result of light refracting through a prism?

    <p>The light is split into its component colors</p> Signup and view all the answers

    What is the primary function of lenses in optical devices?

    <p>To correct vision and magnify images</p> Signup and view all the answers

    What is the term for the process of bending light around a corner or through a small opening?

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

    What occurs when light hits the back of a raindrop?

    <p>It is reflected back into the air</p> Signup and view all the answers

    Which type of lens is used to correct far-sightedness?

    <p>Converging lens</p> Signup and view all the answers

    What is the result of light refracting through a converging lens?

    <p>The light is focused to a point</p> Signup and view all the answers

    What is the purpose of a diverging lens?

    <p>To bend light rays outward, making them spread apart</p> Signup and view all the answers

    What is the main reason for the formation of a rainbow?

    <p>All of the above</p> Signup and view all the answers

    What is the purpose of a converging lens?

    <p>To bend light rays inward to a focal point</p> Signup and view all the answers

    What is the correction for near-sightedness?

    <p>Diverging lens (biconcave)</p> Signup and view all the answers

    What is the term for the process of light bending as it passes from one medium to another?

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

    What is the main application of lenses?

    <p>To correct vision and magnify images</p> Signup and view all the answers

    What happens to light as it exits a raindrop?

    <p>It is refracted again</p> Signup and view all the answers

    What is the main characteristic of a diverging lens?

    <p>It bends light rays outward, making them spread apart</p> Signup and view all the answers

    What is the process of separating a wave, such as light, into its constituent parts?

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

    What is the main difference between converging and diverging lenses?

    <p>The direction of light bending</p> Signup and view all the answers

    What is the result of the refraction, reflection, and dispersion of light in a raindrop?

    <p>A rainbow</p> Signup and view all the answers

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