9th Grade Physics Quiz
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1 What is the unit of force in the International System of Units (SI)?
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Joule
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Watt
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Newton
Correct!Wrong!Force is measured in newtons (N) in the SI system, named after Sir Isaac Newton for his work on the laws of motion.
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2 Which of the following describes Newton’s First Law of Motion?
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An object at rest stays at rest, and an object in motion stays in motion unless acted upon by an external force.
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Force equals mass times acceleration.
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For every action, there is an equal and opposite reaction.
Correct!Wrong!Newton’s First Law, also known as the Law of Inertia, states that an object will remain in its current state of motion unless a force causes a change.
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3 Which of the following is a scalar quantity?
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Velocity
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Speed
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Force
Correct!Wrong!Speed is a scalar quantity because it only has magnitude, not direction. Velocity, on the other hand, is a vector quantity because it includes both magnitude and direction.
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4 What happens to the potential energy of an object as it is lifted higher above the ground?
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It decreases.
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It increases.
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It remains the same.
Correct!Wrong!Potential energy increases with height because it is calculated as the product of mass, gravity, and height (PE=mgh). The higher the object, the greater its potential energy.
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5 What is the formula for calculating work done by a force?
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Work = Force × Velocity
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Work = Force × Distance
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Work = Mass × Acceleration
Correct!Wrong!Work is defined as the force applied to an object multiplied by the distance over which the force is applied in the direction of the force. -
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6 If a wave has a frequency of 500 Hz and a wavelength of 2 meters, what is the speed of the wave?
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250 m/s
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1000 m/s
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500 m/s
Correct!Wrong!The speed of a wave can be calculated using the formula
Speed=Frequency×Wavelength. Here, 500 Hz×2 m=1000
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7 Which type of energy is associated with the motion of an object?
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Potential Energy
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Thermal Energy
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Kinetic Energy
Correct!Wrong!Kinetic energy is the energy an object possesses due to its motion. It increases as the speed of the object increases.
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8 Which of the following statements is true about light and sound waves?
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Light waves can travel through a vacuum; sound waves cannot.
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Sound waves can travel through a vacuum; light waves cannot.
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Both light and sound waves require a medium to travel through.
Correct!Wrong!Light waves are electromagnetic and can travel through a vacuum, while sound waves are mechanical and require a medium (like air, water, or solids) to travel through.
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9 Which of the following best explains why an object sinks in water?
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Its density is greater than that of water.
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Its density is less than that of water.
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Its mass is greater than that of water.
Correct!Wrong!An object sinks in water if its density is greater than the density of water (1 g/cm³). Objects with a lower density will float.
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10 In a simple circuit, if the resistance increases while the voltage remains the same, what happens to the current?
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It increases.
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It decreases.
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It remains the same.
Correct!Wrong!According to Ohm’s Law (V=IR), if the resistance increases and the voltage remains constant, the current must decrease.
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