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Question

As the energy generation in a star stops, its temperature and pressure _______, thereby ________ the star.

A
decrease; expanding
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B
decrease; contracting
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C
increase; expanding
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D
increase; contracting
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Solution

The correct option is C increase; expanding
Once the primary fuel of the star is exhausted, the star starts burning higher elements like nitrogen formed in the thermonuclear fusion. This causes the temperature and pressure of the star increases. On doing so, the star expands into a red giant or a super red giant.

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