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AP Physics 1 Unit 8: Fluids: Density, Buoyancy and Continuity — practice questions — page 3

Explore 93 free Unit 8: Fluids: Density, Buoyancy and Continuity questions in AP Physics 1 Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 8: Fluids: Density, Buoyancy and Continuity questions and exercises with answers

Showing questions 61–90 of 93.

A body covers equal distances in equal intervals of time. Its motion is:Read the answer and worked solution →A body falls freely under gravity. The acceleration due to gravity (g) is approximately:Read the answer and worked solution →Which of the following can be zero for a body that has moved a non-zero distance?Read the answer and worked solution →A body starts from rest and accelerates uniformly at 2 m per second squared for 5 seconds. Its final velocity is:Read the answer and worked solution →Which equation gives displacement in terms of initial velocity, acceleration and time?Read the answer and worked solution →On a displacement-time graph, what does the slope of the line represent?Read the answer and worked solution →A car decelerates uniformly from 20 m per second to rest in 4 seconds. The retardation is:Read the answer and worked solution →On a velocity-time graph, the area under the curve represents:Read the answer and worked solution →A stone is dropped from rest. After 2 seconds its velocity is approximately:Read the answer and worked solution →Sound CANNOT travel through:Read the answer and worked solution →In a sound wave, a region where the density of the medium is HIGHER than average is called a:Read the answer and worked solution →The human audible frequency range is approximately:Read the answer and worked solution →Calculate the time period of a sound of frequency 50 Hz:Read the answer and worked solution →A sonar pulse sent from a ship hits a submarine and returns after 0.90 s. Speed of sound in seawater is 1530 m/s. The distance to the submarine is:Read the answer and worked solution →An ultrasonic wave has a frequency of 50 kHz. If the speed of sound in air is 340 m/s, its wavelength is approximately:Read the answer and worked solution →In a longitudinal wave, particles vibrate:Read the answer and worked solution →A tuning fork produces sound by:Read the answer and worked solution →A region of HIGH air density in a sound wave is called a:Read the answer and worked solution →What does ν (the Greek letter nu) typically denote for a wave?Read the answer and worked solution →An echo is a:Read the answer and worked solution →Sound travels through a steel rail at 5000 m/s. A train signal sent through the rail reaches a distance of 1 km in:Read the answer and worked solution →Two friends push a heavy box from the same side, applying forces of 30 N and 40 N in the same direction. What is the net force on the box?Read the answer and worked solution →How is sound INTENSITY related to the SQUARE of the AMPLITUDE?Read the answer and worked solution →In which medium does sound travel FASTEST?Read the answer and worked solution →Sound waves are an example of:Read the answer and worked solution →Spot the odd sound frequencyRead the answer and worked solution →The minimum distance from a reflecting surface needed to hear a CLEAR echo (with speed of sound ≈ 340 m/s) is about:Read the answer and worked solution →The wavelength λ, frequency ν, and speed v of a wave are related by:Read the answer and worked solution →A whistle has a frequency of 1700 Hz. If the speed of sound in air is 340 m/s, the wavelength is:Read the answer and worked solution →What is the TIME PERIOD of a sound wave with frequency 100 Hz?Read the answer and worked solution →

Worked practice questions

A body covers equal distances in equal intervals of time. Its motion is:

  1. Variable
  2. Accelerated
  3. Uniform
  4. Random
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Correct answer: C. Uniform

1. Uniform motion means the body covers equal distances in equal intervals. 2. Speed and direction remain constant throughout the motion. 3. Variable motion would mean unequal distances in equal intervals. 4. So the described motion is uniform. _Source: Selina Concise Physics ICSE Class 9, Ch 2 'Motion in One Dimension' (aplustopper.com extract)_

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A body falls freely under gravity. The acceleration due to gravity (g) is approximately:

  1. 980 m per second squared
  2. 98 m per second squared
  3. 0.98 m per second squared
  4. 9.8 m per second squared
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Correct answer: D. 9.8 m per second squared

1. The average value of acceleration due to gravity near Earth's surface is about 9.8 metres per second squared. 2. For simpler problems the value 10 metres per second squared is also used. 3. Larger or smaller values change by factors of ten but do not match the textbook average. 4. So the correct value is 9.8 metres per second squared. _Source: Selina Concise Physics ICSE Class 9, Ch 2 'Motion in One Dimension' (aplustopper.com extract)_

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Which of the following can be zero for a body that has moved a non-zero distance?

  1. Displacement
  2. Path distance
  3. Average speed
  4. Elapsed time
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Correct answer: A. Displacement

1. Distance traced is always non-negative and adds up along the path. 2. Speed is non-negative as it is a scalar derived from distance. 3. Displacement is the straight-line vector from start to end. 4. If the body returns to its starting point, displacement is zero even though distance is positive. 5. Hence displacement can be zero for a non-zero distance. _Source: Selina Concise Physics ICSE Class 9, Ch 2 'Motion in One Dimension' (aplustopper.com extract)_

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More Physics topics

Unit 1B: Kinematics: 2D Motion & ProjectilesUnit 1C: Kinematics: Relative & Circular MotionUnit 2A: Newton's Laws and Translational EquilibriumUnit 2B: Friction, Gravitational and Normal ForcesUnit 3A: Work and Kinetic Energy TheoremUnit 3B: Potential Energy & Conservation of EnergyUnit 4A: Linear Momentum and ImpulseUnit 4B: Conservation of Linear Momentum & Collisions