Comprehension


Direction: Read the following passages carefully and answer the question that follows.
We know that gold and silver are elements. An element consists of atoms of only one kind, unlike water, which consists of both hydrogen and oxygen. Another element is radium. Radium is especially interesting, because it produces heat, When soil is carried by rivers down to the sea and falls to the bottom, it often carries radium in it. As more and more soil is washed down into the ocean. more and more radium is carried in it. There, as elsewhere, it constantly produces heat.

  1. This passage is mainly about ?









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    This passage is mainly about a heat-producing elements called radium which produces heat constantly.

    Correct Option: A

    This passage is mainly about a heat-producing elements called radium which produces heat constantly.


  1. Some heat on the ocean floor comes from ?









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    Some heat on the ocean floor comes from radium as more soil gets washed down into the ocean.

    Correct Option: B

    Some heat on the ocean floor comes from radium as more soil gets washed down into the ocean.



Direction: Read the following passages carefully and answer the question that follows.
An iron or steel bridge swells (gets larger) when warmed by the Sun and shrink (gets smaller) when it becomes colder. Heat makes everything expand and cold makes everything contract. Cold is the absence of heat. Metals change their size when heated or cooled and this change is noticeable in a bridge that is made of iron or steel. The builder of a bridge must leave empty spaces for the metal to expand into. Have you noticed that concrete sidewalks have cracks every few feet ? These cracks provide space for the concrete to expand into when heated.

  1. This passage is mainly about ?









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    This passage is mainly about the effect of heat on everything such as the heat on iron, steel, metals, etc.

    Correct Option: A

    This passage is mainly about the effect of heat on everything such as the heat on iron, steel, metals, etc.


  1. Another word for "swells" is ?









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    Another word for "swells" is expands. Because of the heat metals change their size, they expand.

    Correct Option: D

    Another word for "swells" is expands. Because of the heat metals change their size, they expand.



  1. Empty spaces allow room for a material to ?









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    Empty spaces allow room for a material to expand because when materials are heated or warmed they require space to expand.

    Correct Option: D

    Empty spaces allow room for a material to expand because when materials are heated or warmed they require space to expand.