Subject Knowledge Review - Science

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Subject Knowledge Review - Science - Quiz

The world is a combination of art and science. However, most of the things can be explained in both ways. Either way, the quiz below is set to test and upgrade you science general knowledge.


Questions and Answers
  • 1. 

    Which of the following correctly completes the sentence below? All living organisms:

    • A.

      Excrete, grow, move, reproduce, respire, think and are sensitive to their surroundings.

    • B.

      Excrete, feed, grow, move, reproduce, respire and are sensitive to their surroundings.

    • C.

      Excrete, grow, move, mutate, respire and are sensitive to their surroundings.

    • D.

      Excrete, feed, grow, reproduce, signal and are sensitive to their surroundings.

    Correct Answer
    B. Excrete, feed, grow, move, reproduce, respire and are sensitive to their surroundings.
    Explanation
    The correct answer is "Excrete, feed, grow, move, reproduce, respire and are sensitive to their surroundings." This answer includes all the essential characteristics of living organisms. Organisms excrete waste, feed to obtain energy, grow and develop, move to find resources or escape danger, reproduce to pass on their genetic material, respire to obtain energy, and are sensitive to their surroundings to respond to stimuli.

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  • 2. 

    Which of the following best describes the role of the circulatory system in humans? 1. Carries food to body cells. 2. Carries oxygen around the body. 3. Carries waste products.

    • A.

      1, 2 and 3

    • B.

      1 and 2 only

    • C.

      2 and 3 only

    • D.

      1 and 3 only

    Correct Answer
    A. 1, 2 and 3
    Explanation
    The circulatory system in humans plays a crucial role in carrying out various functions. It is responsible for carrying food to body cells, ensuring that they receive the necessary nutrients for energy and growth. Additionally, it carries oxygen around the body, which is essential for cellular respiration and the production of energy. Lastly, the circulatory system also carries waste products away from cells, helping to eliminate toxins and maintain overall health. Therefore, options 1, 2, and 3 accurately describe the role of the circulatory system.

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  • 3. 

    What name is given to a group of organisms, with similar characteristics, which can breed with each other to produce fertile offspring?

    • A.

      A clone

    • B.

      A family

    • C.

      A genus

    • D.

      A species

    Correct Answer
    D. A species
    Explanation
    A species is the correct answer because it refers to a group of organisms that share similar characteristics and are capable of interbreeding to produce fertile offspring. This is the fundamental concept in biology for categorizing and classifying living organisms. Clones, families, and genera are not specific enough to describe this particular characteristic of organisms.

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  • 4. 

    Illustrated below are some 2 spot ladybirds.  Which biologocal feature does this represent?

    • A.

      Growth

    • B.

      Reproduction

    • C.

      Selection

    • D.

      Variation

    Correct Answer
    D. Variation
    Explanation
    This represents the biological feature of variation. The presence of different patterns and colors on the ladybirds indicates genetic diversity within the species. Variation is an important aspect of evolution as it allows for adaptation to changing environments and increases the chances of survival for a species.

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  • 5. 

    For characteristics to be inherited by living organisms

    • A.

      Mutations occur within the cell of the organism

    • B.

      There has to be a mutation of genes within cells

    • C.

      Asexual reporoduction has to take place

    • D.

      Genetic material has to be passed from one generation to another

    Correct Answer
    D. Genetic material has to be passed from one generation to another
    Explanation
    In order for characteristics to be inherited by living organisms, genetic material must be passed from one generation to another. This is because genetic material contains the instructions for the traits and characteristics of an organism. Through processes like sexual reproduction, where genetic material from two parents combines to form offspring, or asexual reproduction, where genetic material is passed down from a single parent, the genetic material is transferred and inherited by the next generation. Mutations occurring within the cell or the occurrence of asexual reproduction are not necessary for inheritance to take place, but the passing of genetic material is essential.

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  • 6. 

    Which of the following results in the least variation among offspring?

    • A.

      Sexual reproduction

    • B.

      Asexual reproduction (cloning)

    • C.

      Mutation

    • D.

      Recombination of genentic material

    Correct Answer
    B. Asexual reproduction (cloning)
    Explanation
    Asexual reproduction (cloning) results in the least variation among offspring because it involves the production of genetically identical individuals. In this process, a single parent passes on its exact genetic material to its offspring, resulting in minimal or no genetic variation. On the other hand, sexual reproduction involves the combination of genetic material from two parents, leading to genetic recombination and increased variation among offspring. Mutation and recombination of genetic material can introduce new genetic variations, further increasing the variation among offspring.

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  • 7. 

    Our current understanding of evolution is based on the idea that:

    • A.

      Changes which occur in living things are harmful to the species

    • B.

      Mutation of genes have led to beneficial changes

    • C.

      There are a fixed number of living organisms

    • D.

      Species which breed with other species produce new organisms

    Correct Answer
    B. Mutation of genes have led to beneficial changes
    Explanation
    Our current understanding of evolution is based on the idea that mutation of genes have led to beneficial changes. This means that changes in the genetic material of living organisms can result in advantageous traits or adaptations that improve their chances of survival and reproduction. These beneficial mutations can then be passed on to future generations, leading to the gradual accumulation of new traits and the formation of new species over time. This concept is supported by numerous scientific studies and observations in the field of evolutionary biology.

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  • 8. 

    Scientists classify all living things into which of these groups?

    • A.

      Plants and animals

    • B.

      Plants, animals and fungi

    • C.

      Plants, animals and bacteria

    • D.

      Plants, animals, fungi and bacteria

    Correct Answer
    D. Plants, animals, fungi and bacteria
    Explanation
    Scientists classify all living things into different groups based on their characteristics and evolutionary relationships. These groups are called kingdoms. The correct answer is "Plants, animals, fungi, and bacteria" because these are the four main kingdoms in which all living organisms are categorized. Plants are multicellular organisms that produce their own food through photosynthesis. Animals are multicellular organisms that consume other organisms for food. Fungi are multicellular or unicellular organisms that obtain nutrients by decomposing organic matter. Bacteria are unicellular organisms that can be found in various environments and have diverse metabolic capabilities.

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  • 9. 

    In an ecosystem there is interaction between all

    • A.

      Plants living in a habitat

    • B.

      Animals living in a habitat

    • C.

      Plants and animals living in a habitat

    • D.

      Plants and animals and their physical environment

    Correct Answer
    D. Plants and animals and their physical environment
    Explanation
    In an ecosystem, there is interaction between plants, animals, and their physical environment. This means that plants and animals depend on each other for survival, as well as on the non-living components of their environment such as air, water, soil, and sunlight. Plants provide oxygen and food for animals, while animals help in pollination and seed dispersal for plants. The physical environment provides the necessary resources and conditions for both plants and animals to thrive. This interdependence and interaction between all these components is crucial for maintaining the balance and functioning of the ecosystem.

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  • 10. 

    Which statement about bacteria is correct?

    • A.

      They always cause diseases

    • B.

      They are only found in living organisms

    • C.

      They are only found in dead organisms

    • D.

      They have a wide distribution

    Correct Answer
    D. They have a wide distribution
    Explanation
    Bacteria have a wide distribution because they can be found in various environments such as soil, water, and even in the human body. They are not limited to living or dead organisms, as they can exist in both. While some bacteria can cause diseases, not all bacteria are harmful, and many play important roles in various ecological processes. Therefore, the statement "They have a wide distribution" is correct.

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  • 11. 

    All materials are made up of elements.  Approximately how many elements are there?

    • A.

      10

    • B.

      20

    • C.

      50

    • D.

      100

    Correct Answer
    D. 100
    Explanation
    The question asks about the approximate number of elements that all materials are made up of. The correct answer is 100, which suggests that there are approximately 100 elements that make up all materials.

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  • 12. 

    The forces holding atoms together are best called:

    • A.

      Attachments

    • B.

      Bonds

    • C.

      Joins

    • D.

      Links

    Correct Answer
    B. Bonds
    Explanation
    The forces that hold atoms together are best described as "bonds". Bonds refer to the electrostatic forces of attraction between atoms, which can be covalent, ionic, or metallic in nature. These bonds are responsible for the formation of molecules and compounds, as they hold the atoms together in a stable arrangement. The terms "attachments," "joins," and "links" do not accurately describe the concept of the forces holding atoms together.

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  • 13. 

    Which of the following is an example of a chemical reaction?

    • A.

      Ice melting

    • B.

      Iron rusting

    • C.

      Salt dissolving in water

    • D.

      Sugar crystallising

    Correct Answer
    B. Iron rusting
    Explanation
    Iron rusting is an example of a chemical reaction because it involves a chemical change. When iron reacts with oxygen and moisture in the air, it forms iron oxide, commonly known as rust. This process alters the chemical composition of iron, resulting in a new substance with different properties. Unlike physical changes such as melting or dissolving, chemical reactions involve the breaking and forming of chemical bonds, resulting in the creation of new substances.

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  • 14. 

    Physical changes involve changes in the arrangements and spacing of particles but no new substances are formed.  Which of the following is an example of a physical change?

    • A.

      Baking a cake

    • B.

      Milk going sour

    • C.

      Petrol burning

    • D.

      Water evaporating

    Correct Answer
    D. Water evaporating
    Explanation
    Water evaporating is an example of a physical change because it involves a change in the arrangement and spacing of water particles without the formation of any new substances. During evaporation, water molecules gain enough energy to break their intermolecular bonds and escape into the air as water vapor. However, the chemical composition of water remains the same before and after evaporation. Therefore, no new substances are formed, making it a physical change.

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  • 15. 

    The table gives information about the melting points and boiling points of four substances.  Room temperature is about 20°C Substance Melting Point /°C Boiling Point / °C P -95 111 Q 17 118 R 114 183 S 1455 2835 Which statement is correct?

    • A.

      Substance P will freeze solid on a very cold day

    • B.

      Substance Q could be a liquid on some days and solid on others

    • C.

      Substance R never forms a liquid

    • D.

      Substance S cannot evaporate

    Correct Answer
    B. Substance Q could be a liquid on some days and solid on others
    Explanation
    Substance Q could be a liquid on some days and solid on others because its melting point is 17°C, which is close to room temperature (20°C). This means that on colder days, the substance could be in a solid state, while on warmer days, it could transition into a liquid state.

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  • 16. 

    A drop of water contains

    • A.

      One molecule of water

    • B.

      Hundreds of molecules of water

    • C.

      Thousands of molecules of water

    • D.

      Millions of molecules of water

    Correct Answer
    D. Millions of molecules of water
    Explanation
    A drop of water contains millions of molecules of water because water molecules are very small and compact. In a single drop of water, there are numerous water molecules tightly packed together. The exact number of molecules can vary depending on the size of the drop, but it is generally in the range of millions.

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  • 17. 

    A dish of warm water is left to evaporate.  Which of the following statements about evaporation is true?

    • A.

      A dish of cold water would evaporate more quickly

    • B.

      A liquid with a higher boiling point than average would evaporate more quickly

    • C.

      Molecules with higher than average energy escape from the surface

    • D.

      Warm water would evaporate more slowly on a windy day

    Correct Answer
    C. Molecules with higher than average energy escape from the surface
    Explanation
    Evaporation is the process by which molecules at the surface of a liquid gain enough energy to escape into the surrounding air as a gas. Molecules with higher than average energy have a greater chance of escaping from the surface, leading to evaporation. Therefore, the statement "Molecules with higher than average energy escape from the surface" is true.

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  • 18. 

    The reaction of hydrogen and iodine can be represented by: In this reaction

    • A.

      Bonds between hydrogen atoms are formed

    • B.

      Bonds between iodine atoms are formed

    • C.

      Bonds between hydrogen atoms and iodine atoms are formed

    • D.

      No bonds are broken or formed

    Correct Answer
    C. Bonds between hydrogen atoms and iodine atoms are formed
    Explanation
    In the reaction of hydrogen and iodine, new bonds are formed between hydrogen atoms and iodine atoms. This is because hydrogen and iodine atoms have a high tendency to form a covalent bond, where they share electrons to achieve a stable electron configuration. Therefore, the correct answer is that bonds between hydrogen atoms and iodine atoms are formed.

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  • 19. 

    A closed jar containing ice cubes is placed on a balance.  The reading is noted.  After an hour, the ice cubes have melted.  Which of these statements is correct?

    • A.

      The reading is more because ice cubes float

    • B.

      The reading is less because the volume of the ice cubes has decreased

    • C.

      The reading is less because water is less dense than ice

    • D.

      The reading stays the same because mass in neither lost or gained

    Correct Answer
    D. The reading stays the same because mass in neither lost or gained
    Explanation
    The reading on the balance stays the same because mass is neither lost nor gained. When the ice cubes melt, they transform from a solid state (ice) to a liquid state (water). However, the total mass of the system remains constant. The water that is formed from the melted ice has the same mass as the ice cubes, so there is no change in the reading on the balance.

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  • 20. 

    Particles called electrons are present

    • A.

      In all forms of matter

    • B.

      Only in matter which conducts electricity

    • C.

      Only in liquid or solid matter

    • D.

      Only in matter which has a charge of electricity passing through it

    Correct Answer
    A. In all forms of matter
    Explanation
    Electrons are subatomic particles that are present in all forms of matter. They are negatively charged and are found orbiting around the nucleus of an atom. Electrons play a crucial role in determining the properties and behavior of matter. They are responsible for the flow of electricity in conductors, but their presence is not limited to conducting materials. Electrons are also found in non-conductive materials, such as liquids and solids. Additionally, electrons are present in matter even when there is no electrical charge passing through it. Therefore, the correct answer is that electrons are present in all forms of matter.

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  • 21. 

    Copper wire is a good electrical conductor because

    • A.

      Some electrons in the metal can move easily within the wire

    • B.

      The particles of copper can move easily within the wire

    • C.

      It is encased in plastic

    • D.

      Copper already contains electricity

    Correct Answer
    A. Some electrons in the metal can move easily within the wire
    Explanation
    Copper wire is a good electrical conductor because some electrons in the metal can move easily within the wire. In metals, such as copper, the outermost electrons of the atoms are loosely bound and can move freely. When a voltage is applied, these free electrons can easily flow through the wire, carrying electric current. This property of copper allows it to efficiently transmit electricity, making it a commonly used material in electrical wiring.

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  • 22. 

    The electrical resistance of a conductor is

    • A.

      The measure of the difficulty of the flow of electrons through the conductor

    • B.

      A measure of density of the conductor

    • C.

      A measure of the flow of electricity through the conductor

    • D.

      The measure of the voltage which has passed through the conductor

    Correct Answer
    A. The measure of the difficulty of the flow of electrons through the conductor
    Explanation
    The electrical resistance of a conductor is a measure of the difficulty of the flow of electrons through the conductor. Resistance is caused by collisions between electrons and atoms in the conductor, which impedes the flow of current. A higher resistance means a greater difficulty for electrons to pass through the conductor, resulting in a lower current flow. Conversely, a lower resistance allows for easier electron flow and a higher current. Therefore, the correct answer is that the electrical resistance of a conductor is the measure of the difficulty of the flow of electrons through the conductor.

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  • 23. 

    The batteries in a torch make the bulb light because they

    • A.

      Transmit electricity to the bulb through the air like radio waves

    • B.

      Give out chemicals which pass around the circuit and are used up

    • C.

      Push the electrons around the circuit in one direction

    • D.

      Make electrons flow outwards to the light bulb where they are used up

    Correct Answer
    C. Push the electrons around the circuit in one direction
    Explanation
    The batteries in a torch push the electrons around the circuit in one direction. This is known as a direct current, where the flow of electrons is consistent and in a single path. As the electrons move through the circuit, they encounter the filament of the bulb, which offers resistance. This resistance causes the filament to heat up and emit light. Therefore, the batteries are responsible for creating a continuous flow of electrons that ultimately powers the light bulb in the torch.

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  • 24. 

    In a complete circuit, the flow of electricity

    • A.

      Is the same through the switch, through the bulb and along the wire

    • B.

      Is greater through the wire in the bulb than elsewhere in the circuit

    • C.

      Is less through the wire in the bulb than elsewhere in the circuit

    • D.

      Is less at the end of its journey than at the beginning

    Correct Answer
    A. Is the same through the switch, through the bulb and along the wire
    Explanation
    In a complete circuit, the flow of electricity is the same through the switch, through the bulb, and along the wire. This is because in a series circuit, the current remains constant throughout the circuit. The switch, bulb, and wire are all connected in a series, so the current passing through them is the same.

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  • 25. 

    When this curcuit is complete

    • A.

      The bulb transfers power from the battery

    • B.

      The battery gains energy from the bulb and becomes warm

    • C.

      The bulb transfers the energy stored in the battery to light and heat

    • D.

      The potential energy is controlled by the length of the electrical wire

    Correct Answer
    C. The bulb transfers the energy stored in the battery to light and heat
    Explanation
    When the circuit is complete, the bulb acts as a load and converts the electrical energy stored in the battery into light and heat energy. This is possible because the bulb contains a filament that heats up when an electric current passes through it, producing light and heat as a result. The energy transfer occurs from the battery to the bulb, allowing the bulb to illuminate and generate heat. The potential energy in the circuit is not controlled by the length of the electrical wire, but rather by the voltage provided by the battery.

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  • 26. 

    A table lamp is designed to take a bulb of 100 watts maximum.  Watts are a measure of

    • A.

      The rate at which energy is transferred to the bulb

    • B.

      The current which flows through the bulb

    • C.

      The voltage needed to light the bulb

    • D.

      The size of the bulb

    Correct Answer
    A. The rate at which energy is transferred to the bulb
    Explanation
    The correct answer is "The rate at which energy is transferred to the bulb." Watts are a unit of power, which measures the rate at which energy is transferred or used. In this case, the table lamp is designed to handle a maximum of 100 watts, indicating that it can safely transfer energy to the bulb at a rate of up to 100 watts.

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  • 27. 

    What happens when electrons travel through the filament of a light bulb

    • A.

      They escape from the filament, glowing brightly

    • B.

      They cause friction which heats the filament and emits light

    • C.

      They collide with fixed atoms in the filament causing them to vibrate, get hot and emit light

    • D.

      They carry heat from the battery to light the filament

    Correct Answer
    C. They collide with fixed atoms in the filament causing them to vibrate, get hot and emit light
    Explanation
    When electrons travel through the filament of a light bulb, they collide with fixed atoms in the filament. This collision causes the atoms to vibrate, which in turn generates heat. As the temperature of the filament increases, it starts to emit light, resulting in the glow of the light bulb. Therefore, the correct answer is that the electrons collide with fixed atoms in the filament, causing them to vibrate, get hot, and emit light.

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  • 28. 

    Two small bar magnets are suspended by threads 10 cm apart.  Which one of these pictures shows how they will come to rest?

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    Correct Answer
    A. A
    Explanation
    In option A, the bar magnets are aligned in opposite directions, causing them to attract each other. This attraction will cause the magnets to come to rest with their north poles facing each other. In options B, C, and D, the magnets are either aligned in the same direction or at different angles, which will not result in them coming to rest. Therefore, option A is the correct answer.

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  • 29. 

    A wright lifter lifts a bar.  Which one of these statements is correct?

    • A.

      The weight lifter uses energy to exert a force on the bar

    • B.

      The force of the bar uses up the weight lifters energy

    • C.

      The weight lifter uses force to exert energy on the bar

    • D.

      The energy in the bar uses up the weight lifter's force

    Correct Answer
    A. The weight lifter uses energy to exert a force on the bar
    Explanation
    The correct answer is that the weight lifter uses energy to exert a force on the bar. This is because in order to lift the bar, the weight lifter needs to apply a force against the force of gravity. This force requires energy, which is provided by the weight lifter's muscles.

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  • 30. 

    Which of the following is not an example of energy transfer?

    • A.

      A book resting on a table

    • B.

      A candle burning

    • C.

      A person walking upstairs

    • D.

      A radio playing

    Correct Answer
    A. A book resting on a table
    Explanation
    A book resting on a table does not involve energy transfer because there is no movement or change in the book's position or state. Energy transfer occurs when there is a change in the form or location of energy. In the case of the other options, energy is being transformed or transferred. For example, in a candle burning, chemical energy is being converted into heat and light energy. In a person walking upstairs, mechanical energy is being transferred from the person's muscles to their movement. In a radio playing, electrical energy is being converted into sound energy.

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  • 31. 

    The diagrams show a space shuttle on its launch pad and then moving through space in a straight line. Which pair of statements about the forces acting on the shuttle are true?   On the launch pad, forces are: In space, the forces are: A Balanced Balanced B Balanced Unbalanced C Unbalanced Balanced D Unbalanced Unbalanced

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    Correct Answer
    A. A
    Explanation
    On the launch pad, forces are balanced because the shuttle is stationary and not moving. In space, the forces are also balanced because the shuttle is moving in a straight line at a constant speed.

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  • 32. 

    A child drops a ball Whcih diagram correctly shows the forces acting on the ball after it leaves their hand?

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    Correct Answer
    A. A
    Explanation
    Diagram A correctly shows the forces acting on the ball after it leaves the child's hand. The force of gravity is acting downwards, represented by the arrow pointing downwards. There is no other force acting on the ball, so there are no additional arrows in the diagram.

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  • 33. 

    The engine of a moving boat is turned off.  Which two forces cause the boat to slow down and stop?

    • A.

      Air resistance and weight resistance

    • B.

      Air resistance and water resistance

    • C.

      Upthrust and water resistance

    • D.

      Weight resistance and water resistance

    Correct Answer
    B. Air resistance and water resistance
    Explanation
    When the engine of a moving boat is turned off, the boat slows down and stops due to the forces of air resistance and water resistance. Air resistance is the force exerted by the air on the boat as it moves through the atmosphere, which opposes its motion and causes it to slow down. Water resistance is the force exerted by the water on the boat, which also opposes its motion and further contributes to its deceleration. Together, these two forces act against the boat's forward motion, eventually bringing it to a stop.

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  • 34. 

    The mass of an object is:

    • A.

      The amount of space it takes up, measured in meters cubed

    • B.

      The amount of matter in it, measured in kilograms

    • C.

      Its capacity, measured in litres

    • D.

      Its density, measured in kilograms per meters cubed

    Correct Answer
    B. The amount of matter in it, measured in kilograms
    Explanation
    The mass of an object refers to the amount of matter it contains, which is measured in kilograms. Mass is a fundamental property of an object and is independent of its size or shape. It is different from volume (amount of space it takes up), capacity (measured in liters), or density (measured in kilograms per meters cubed). Mass can be thought of as a measure of the inertia of an object, determining how it responds to external forces.

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  • 35. 

    Whcih pair of statements is correct?   Gravitational attraction exists between: The size of pull: A Planets and objects close to them only Depends on mass of objects B Objects which are very close together only Does not depend on mass of objects C Earth and objects near its surface Does not depend on mass of objects or the distance they are apart D All objects of any mass Depends on mass of objects and the distance they are apart

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    Correct Answer
    D. D
    Explanation
    Gravitational attraction exists between all objects of any mass and depends on the mass of the objects and the distance they are apart. This means that the gravitational pull between two objects will be stronger if they have a larger mass and if they are closer together. Therefore, option D is the correct pair of statements.

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  • 36. 

    A piece of rock is brought back to Earth from the Moon.  What happens to its mass and the amount of matter it contains?   Mass Amount of matter A Decreases Decreases B Decreases Stays the same C Stays the same Stays the same D Stays the same Decreases

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    Correct Answer
    C. C
    Explanation
    When a piece of rock is brought back to Earth from the Moon, its mass stays the same. Mass is a measure of the amount of matter in an object, and it remains constant regardless of the location. Similarly, the amount of matter the rock contains also stays the same because matter cannot be created or destroyed. Therefore, the correct answer is C - Stays the same.

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  • 37. 

    An astronaut standing on the Moon dropped a hammer and a feather together from the same height.  There is no air resistance on the Moon.  What happened?

    • A.

      The hammer landed first

    • B.

      The hammer and the feather landed at the same time

    • C.

      The hammer and the feather did not move

    • D.

      The feather landed first

    Correct Answer
    B. The hammer and the feather landed at the same time
    Explanation
    In the absence of air resistance on the Moon, both the hammer and the feather experience only the force of gravity. Since they are dropped from the same height, they will both fall with the same acceleration due to gravity. Therefore, they will both land at the same time.

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  • 38. 

    A torch shines on a screen.  A solid ball is put in the way.  Whcih diagram shows how the shadow is formed?

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    Correct Answer
    B. B
    Explanation
    The correct answer is B because it shows that when the solid ball is placed in the way of the torch's light, a shadow is formed on the screen behind the ball. This is because the ball blocks the light from reaching the screen, creating a dark area behind it.

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  • 39. 

    Mirrors are able to form a clear image because light is

    • A.

      Transmitted from the mirror

    • B.

      Absorbed by the morror

    • C.

      Reflected by the mirror

    • D.

      Scattered by the mirror

    Correct Answer
    C. Reflected by the mirror
    Explanation
    Mirrors are able to form a clear image because light is reflected by the mirror. When light hits a mirror, it bounces off the smooth surface of the mirror and creates a reflection. This reflection allows the light to maintain its original properties, such as direction and intensity, resulting in a clear image being formed.

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  • 40. 

    A green t-shirt looks green when viewed in white light because

    • A.

      It absorbs green light only

    • B.

      It scatters green light, but absorbs other colours

    • C.

      No light is scattered

    • D.

      Is scatters all the colour in white light

    Correct Answer
    B. It scatters green light, but absorbs other colours
    Explanation
    When white light falls on a green t-shirt, the t-shirt appears green because it scatters green light. The molecules in the fabric absorb all the other colors present in white light, but reflect or scatter the green light back to our eyes. This selective scattering of green light is what gives the t-shirt its green appearance.

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  • 41. 

    We are able to see a book because

    • A.

      Light is scattered by the book and enters our eyes

    • B.

      Our eyes reflect light from the book

    • C.

      Light is absorbed by the book

    • D.

      The book transmits light rays to our eyes

    Correct Answer
    A. Light is scattered by the book and enters our eyes
    Explanation
    When light falls on an object like a book, it interacts with the surface of the book. The molecules in the book scatter the light in different directions. Some of this scattered light enters our eyes and reaches the retina. The retina then sends signals to the brain, which interprets these signals as the image of the book. Therefore, we are able to see a book because light is scattered by the book and enters our eyes.

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  • 42. 

    If we alter the frequency of a sound, we change its

    • A.

      Loudness

    • B.

      Pitch

    • C.

      Speed

    • D.

      Amplitude

    Correct Answer
    B. Pitch
    Explanation
    When we alter the frequency of a sound, we change its pitch. Pitch refers to the perceived highness or lowness of a sound. The frequency of a sound wave determines its pitch, with higher frequencies corresponding to higher pitches and lower frequencies corresponding to lower pitches. Therefore, altering the frequency of a sound will result in a change in its perceived pitch.

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  • 43. 

    Sounds are heard when vibrations from an object...

    • A.

      Enter the ear and travel along tubes into the brain

    • B.

      Echo close to the eardrums causing impulses to be carried by nerves to the brain

    • C.

      Cause the eardrums to vibrate and impulses to be carried by nerves to the brain

    • D.

      Are reflected by the eardrums causing impulses to be carried by nerves to the brain

    Correct Answer
    C. Cause the eardrums to vibrate and impulses to be carried by nerves to the brain
    Explanation
    When sounds are produced, they cause the eardrums to vibrate. These vibrations are then transmitted through the middle ear bones to the inner ear. In the inner ear, the vibrations are converted into electrical impulses by the hair cells. These impulses are then carried by the auditory nerve to the brain, where they are processed and interpreted as sound.

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  • 44. 

    The planets, in order of distance from the Sun are

    • A.

      Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto

    • B.

      Earth, Mercury, Venus, Saturn, Mars, Jupiter, Uranus, Pluto and Neptune

    • C.

      Mercury, Mars, Jupiter, Earth, Saturn, Neptune, Pluto, Uranus and Venus

    • D.

      Venus, Earth, Mercury, Mars, Saturn, Jupiter, Pluto, Uranus and Neptune

    Correct Answer
    A. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto
    Explanation
    The correct answer is the first option: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. This answer lists the planets in the correct order of their distance from the Sun, starting with the closest planet (Mercury) and ending with the farthest planet (Pluto).

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  • 45. 

    At different times of the month, the Moon looks a different shape.  This is because

    • A.

      The Earth casts a shadow on the Moon

    • B.

      Clouds hide part of the Moon

    • C.

      The Moon passes behind a planet

    • D.

      Half the Moon is lit by the Sun but we see it from a different angle

    Correct Answer
    D. Half the Moon is lit by the Sun but we see it from a different angle
    Explanation
    The correct answer is that half the Moon is lit by the Sun but we see it from a different angle. This is because the Moon orbits around the Earth, and as it does so, the angle at which we see the illuminated portion of the Moon changes. This causes different shapes or phases of the Moon to be visible from Earth at different times of the month.

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  • 46. 

    Day and night occur because the

    • A.

      Sun rotates

    • B.

      Earth rotates

    • C.

      Sun goes around the Earth

    • D.

      Earth goes around the Sun

    Correct Answer
    B. Earth rotates
    Explanation
    Day and night occur because the Earth rotates on its axis. As the Earth spins, different parts of it are exposed to the Sun's light, creating daytime, while other parts are in shadow, creating nighttime. This rotation causes the cycle of day and night that we experience on Earth.

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