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  • B)

    equal to the weight of the other bucket.

  • C)

    more than the weight of the other bucket.

Answer: B

  • 24)

    If a battleship sinks in a canal lock, the water level in the lock will

    • A)

      rise.

    • B)

      fall.

    • C)

      remain unchanged.

Answer: B

  • 25)

    When a boat sails from fresh water to salt water, the boat will float

    • A)

      lower in the water.

    • B)

      higher in the water.

    • C)

      at the same water level.

Answer: B

26) A boat loaded with wood floats in a swimming pool. When the wood is thrown overboard, the pool level will

  • A)

    rise.

  • B)

    fall.

  • C)

    remain unchanged.

Answer: C

27) Two small objects are suspended from threads. When the objects are moved close together, they attract one another. Which of the following could produce this result?

  • A)

    One object is positively charged and the other is negatively charge.

  • B)

    One object is positively charged and the other is uncharged.

  • C)

    One object is negatively charged and the other is uncharged.

  • D)

    All of the above could result in such attraction.

Answer: D

28) Two point charges are 4 cm apart. They are moved to a new separation of 2 cm. By what factor does the resulting mutual force between them change?

  • A)

    1/2

  • B)

    2

  • C)

    1/4

  • D)

    4

Answer: D

29) Two identical blocks of iron, one at 10 degrees C and the other at 20 degrees C, are put in contact. Suppose the cooler block cools to 5 degrees C and the warmer block warms to 25 degrees C. This would violate the

  • A)

    1st law of thermodynamics.

  • B)

    2nd law of thermodynamics.

  • C)

    both of these

  • D)

    neither of these

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