Science Exam Questions And Answers

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Science Exam Questions And Answers - Quiz

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Questions and Answers
  • 1. 

    In the water cycle, water returns to the Earth as CONDENSATION usually in form of rain or snow

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Water returns to the Earth as precipitation, which includes rain, snow, sleet, or hail. Condensation is actually a step in the water cycle where water vapor cools and turns back into liquid water, forming clouds. These clouds eventually release their moisture as precipitation, which then falls back to the Earth. Therefore, the statement that water returns to the Earth as condensation is incorrect.

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  • 2. 

    Water vapor in the atmosphere condenses to form CLOUDS.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Water vapor in the atmosphere condenses to form clouds. This is true because when warm air rises, it expands and cools. As the air cools, it reaches its dew point, which is the temperature at which the air is saturated and cannot hold any more water vapor. At this point, the water vapor condenses into tiny water droplets or ice crystals, forming clouds. These clouds can then lead to precipitation such as rain, snow, or hail. So, the statement is correct.

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  • 3. 

    The sour of almost all fresh water  on Earth's surface is the PRECIPITATION

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Precipitation refers to the process by which water vapor in the atmosphere condenses and falls to the Earth's surface as rain, snow, sleet, or hail. It is the primary source of fresh water on Earth. Therefore, the statement that the source of almost all fresh water on Earth's surface is precipitation is true.

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  • 4. 

    The three states of the water are: LIQUID/ GAS / SOLID

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Water can exist in three states: liquid, gas, and solid. In the liquid state, water is in its typical form that we see and use every day. In the gas state, water vaporizes and becomes invisible, such as when it evaporates from a boiling pot. In the solid state, water freezes and becomes ice. These three states are well-known and scientifically proven, making the statement "The three states of water are liquid, gas, and solid" true.

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  • 5. 

    A ball rolling on the ground slows down and finally stops because

    • A.

      Force

    • B.

      Less force applied

    • C.

      Friction

    • D.

      None of the above

    Correct Answer
    C. Friction
    Explanation
    The correct answer is friction. Friction is the force that opposes the motion of objects in contact with each other. In the case of a ball rolling on the ground, as it moves, there is friction between the ball and the ground. This friction gradually slows down the ball's motion until it eventually comes to a stop. Without friction, the ball would continue rolling indefinitely.

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  • 6. 

    Which of the following is an example of a non-contact force?

    • A.

      The force exerted by magnets

    • B.

      The force exerted by us to lift a bucket

    • C.

      Push a stationary car

    • D.

       Force due to friction

    Correct Answer
    A. The force exerted by magnets
    Explanation
    The force exerted by magnets is an example of a non-contact force because it can act on objects without physically touching them. Magnets have a magnetic field that can attract or repel other magnetic objects from a distance. This force can be observed when two magnets are brought near each other and they either attract or repel each other without any direct contact. Therefore, the force exerted by magnets is a non-contact force.

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  • 7. 

    Which one of the following forces is a contact force?

    • A.

      Force of gravity

    • B.

      Magnetic force

    • C.

      Electrostatic force

    • D.

      Force of friction

    Correct Answer
    D. Force of friction
    Explanation
    The force of friction is a contact force because it occurs when two surfaces are in contact with each other and it opposes the motion or tendency of motion between them. It is caused by the irregularities in the surfaces and the interlocking of the microscopic bumps and ridges on the surfaces. This force is experienced in everyday situations such as walking, driving a car, or sliding objects on a table.

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  • 8. 

    An irregular surface will have

    • A.

      Greater friction

    • B.

      Zero Friction

    • C.

      Lesser friction

    • D.

      Lubrication

    Correct Answer
    A. Greater friction
    Explanation
    An irregular surface will have greater friction because irregularities in the surface create more points of contact between the objects in contact. This increased contact leads to more resistance to motion, resulting in greater friction.

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  • 9. 

    Force of friction depends on (a) Smoothness of the surface

    • A.

      Roughness of the surface

    • B.

      Inclination of the surface

    • C.

      Smoothness of the surface

    • D.

       All the above

    Correct Answer
    D.  All the above
    Explanation
    The force of friction depends on the smoothness of the surface because a smoother surface allows for less friction. It also depends on the roughness of the surface because a rougher surface creates more friction. Additionally, the force of friction is influenced by the inclination of the surface because a steeper incline increases friction. Therefore, all of the given options affect the force of friction.

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  • Current Version
  • Mar 19, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 22, 2021
    Quiz Created by
    Themes
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