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Physical Science

Physical Science. Write the letter to the your answer. A. 1. The diagram shows an electric field around a positively charged sphere. How should the letter D be positioned to show a place where the electric field is strongest?

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Physical Science

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  1. Physical Science Write the letter to the your answer.

  2. A 1. The diagram shows an electric field around a positively charged sphere. How should the letter D be positioned to show a place where the electric field is strongest? A at the end of an arrowB between points B and CC on top of point BD between point A and the sphere + B C

  3. 2. Which of the following is a form of electrical energy? A sunlightB a burning candle C a falling appleD lightning

  4. 3. Which of the following is required for an electric current to flow? A insulatorsB positive chargesC an electrical device D an unbroken circuit

  5. 4. Which of the following is the best model for the magnetic field of Earth? A. B. C.

  6. 5. Which of the following substances can be used to make a magnet? A magnesiumB lead C gold D iron

  7. 6. Study Magnet A. Where is the magnetic force the weakest on this bar magnet? A near the north pole of the magnetB near the middle of the magnetC at the magnet’s north and south poles D near the south pole of the magnet Magnet A

  8. 7. Which of the following best describes the direction of the force of friction being applied to the bottle by the horizontal surface? A  to the left B  downward C  upward D  to the right

  9. 8. What is produced around a wire when an electric current flows through the wire? A resistanceB electric chargesC a solenoidD a magnetic field

  10. 9. You are investigating the power of magnetism. How can you strengthen the magnetic field produced by an electric current? A turn the current off and on quickly B add loops or coils to the wireC change the direction of the current D place compasses around the wire

  11. 10. What question is best answered by the diagram below? A What is an AC generator?B What is an electric motor?C What is a step-up transformer?D What is a step-down transformer?

  12. 11. You are investigating the power of magnetism. You can increase the strength of an electromagnet by A  decreasing the current in the wire. B  decreasing the number of loops in the wire. C  using a stronger ferromagnetic material for the core. D  increasing the thickness of insulation on the wire.

  13. 12. What happens when a current-carrying wire is placed in a magnetic field? A  Electrical energy is converted to mechanical energy. B  Mechanical energy is converted to electrical energy. C  The wire becomes a permanent magnet. D  The current stops flowing.

  14. 13. While a train is moving forward, a 25,000-N force acts on the train inthe forward direction, and then an additional 26,000-N force acts in the opposite direction. What is the net force on the train? A  51,000 N forward B  25,500 N forward C  1,000 N backward D 25,500 N backward

  15. 14. You exert a force of 120 N to push a box down the hallway. Your friend helps by exerting a force of 150 N against the box in the same direction. Which net force do you and your friend exert on the box? A 30 N B 120 N C 150 N D 270 N

  16. Pair 1 Pair 2 • 15. The four balls of equal density in the diagram are made of the same material and are solid. Why is the force of gravity between the balls in Pair 1 weaker than the force of gravity between the balls in Pair 2? • A  The balls in Pair 2 are closer together than the balls in Pair 1. • B  The balls in Pair 2 have a greater mass than the balls in Pair 1. • C  The balls in Pair 1 have more rolling friction than the balls in Pair 2. • D  The balls in Pair 1 have more magnetic force than the balls in Pair 2.

  17. 16. A girl jumps forward off a boat. According to Newton’s third law of motion, what happens to the boat? A  The boat also moves forward. B  The boat remains motionless. C  The boat moves backward. D  The boat moves forward and then backward.

  18. What kind of wave is being generated? A  longitudinal wave B  surface wave C  transverse wave D  electromagnetic wave

  19. 18. In order for a wave to form, what must energy cause a medium to do?

  20. 19. By determining the number of waves that pass a certain point in a given amount of time, you know the wave’s.

  21. 20. Which of the following can you calculate by multiplying a wave’s frequency by its wavelength?

  22. A  Light travels at higher speed in the medium below the boundary. • B  Light travels at lower speed in the medium below the boundary. • C  The medium above the boundary causes regular reflection. • D  The medium below the boundary causes diffuse reflection. 21. The diagram of wave crests shows how light rays change direction when they travel from one medium into another medium. What causes this change in direction?

  23. 22. Which of the following questions is not a scientific question about light?

  24. 23. Which of the following statements about sound waves used as communication is true?

  25. 24. Which statement best describes how electromagnetic waves, such as light waves, differ from other types of waves, such as sound or water waves? A  They can travel in a straight line. B  They do not involve vibration. C  They do not transmit energy. D  They can travel through a vacuum.

  26. 25. One way to demonstrate the wave nature of light is to pass light through

  27. 26. The color of an opaque object is determined by the wavelengths of light the object

  28. 27. Electricity flows through a transformer with more loops of wire in the secondary coil than in the primary coil. How will the voltage in the two coils compare? A  The voltage will be higher in the primary coil. B  The voltage will be higher in the secondary coil. C  The current will be higher in the primary coil. D  The current will be higher in the secondary coil.

  29. 28. A student conducted an experiment where she measured the maximum distance between two magnets before they attracted each other. None of the results confirmed her hypothesis. What should she do?

  30. 29. Maria and Raoul are the same age and about the same size. They are each sitting on an inner tube in the middle of a swimming pool. If Maria pushes Raoul’s inner tube, what will happen? A  Maria will move away from Raoul and Raoul will not move. B  Maria will move away from Raoul and Raoul will move closer to Maria. C  Maria and Raoul will both move in opposite directions from each other. D  Neither Maria nor Raoul will move.

  31. 30. Which object’s surface exhibits regular reflection?

  32. 31. Visible light can be separated into the various colors of the visible spectrum by

  33. 32. Sara is wading through a shallow pond and collecting rock samples. Sara seesa rock, reaches into the water to pick it up, and finds that she has misjudged and picked up the wrong rock. What caused the apparent location of the rock to differ from its actual location?

  34. 33. The boy pulls on the rope to move the wagon. If he doubles the amount of force he applies, how does the speed of the cart change? A  The cart travels half the distance. B  The cart moves faster. C  The cart slows down to a stop. D  The motion of the cart is unchanged.

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