Q: What process, which results because of great pressure at the center of a star, causes stars to shine? Choices: - gravitational pull - electric fusion - energy fusion - nuclear fusion A:
nuclear fusion
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Q: How does the image focused by the eye travel to the brain? Choices: - the sensory nerve - the modulated nerve - the secondary nerve - the optic nerve A:
the optic nerve
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Q: What is the only way of transferring energy that doesn't require matter? Choices: - mutation - evaporation - convection - radiation A:
radiation
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Q: What happens to the mass number during a nuclear decay process by positron emission? Choices: - it rises - it decreases - it increases - remains unchanged A:
remains unchanged
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