This quiz is designed for 7th-grade students with explanations to help reinforce learning:
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1 What is the force that pulls objects toward the Earth called?
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Magnetism
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Friction
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Gravity
Correct!Wrong!Explanation:
Gravity is the force that attracts objects toward the center of the Earth or any other massive body.
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2 What is the unit of measurement for force in the SI system?
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Joule
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Newton
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Watt
Correct!Wrong!Explanation:
The SI unit of force is the newton (N), named after Sir Isaac Newton, who formulated the laws of motion.
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3 Which of these is an example of kinetic energy?
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A book lying on a table
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A compressed spring
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A rolling ball
Correct!Wrong!Explanation:
Kinetic energy is the energy of motion. A rolling ball is moving, so it has kinetic energy.
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4 What type of energy is stored in a stretched rubber band?
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Potential Energy
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Kinetic Energy
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Thermal Energy
Correct!Wrong!Explanation:
A stretched rubber band has potential energy because energy is stored in it due to its stretched position.
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5 What is the speed of an object that travels 20 meters in 4 seconds?
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5 m/s
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10 m/s
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5 m/s
Correct!Wrong!Explanation:
Speed is calculated using the formula Speed= TimeDistance. So, Speed=204=5 m/stext{Speed} = frac{20}{4} = 5 , text{m/s}Speed=420=5m/s.
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6 What is the primary source of energy for life on Earth?
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Wind
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Water
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The Sun
Correct!Wrong!Explanation:
The Sun is the primary source of energy for most life on Earth, providing heat and light necessary for photosynthesis and warming the planet.
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7 What happens to the speed of an object when a constant force is applied?
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It slows down.
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It speeds up.
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It remains the same.
Correct!Wrong!Explanation:
When a constant force is applied, the object accelerates, increasing its speed over time.
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8 Which of these materials is a good conductor of electricity?
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Rubber
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Plastic
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Copper
Correct!Wrong!Explanation:
Copper is a good conductor of electricity because it allows electric current to flow through it easily.
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9 What causes a moving object to eventually stop if no force is applied?
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Gravity
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Friction
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Acceleration
Correct!Wrong!Explanation:
Friction is the force that opposes motion and causes a moving object to slow down and eventually stop. -
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10 Which of these is a non-renewable energy source?
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Solar Energy
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Wind Energy
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Coal
Correct!Wrong!Explanation:
Coal is a non-renewable energy source because it takes millions of years to form, and its supply is limited.
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