OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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Prepare for the OCR GCSE Biology Exam with our comprehensive study resources. Practice with quizzes, flashcards, and detailed explanations to enhance your understanding. Ace your exam and secure your academic success!

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What is the size of nanoparticles?

1x10^-6 meters
1x10^-9 meters
1x10^-12 meters
1x10^-3 meters

The correct answer is: 1x10^-9 meters

Nanoparticles are defined as particles that have at least one dimension in the size range of 1 to 100 nanometers (1x10^-9 meters to 1x10^-7 meters). The correct answer of 1x10^-9 meters signifies the upper limit of this size range, placing it well within the category of nanoparticles. This size range is significant as it imparts unique physical and chemical properties compared to larger particles, leading to different behaviors in applications such as medicine, electronics, and materials science. Nanoparticles often exhibit phenomena such as increased reactivity and specific optical properties due to their small size, which can differ dramatically from bulk materials composed of the same substance. In contrast, the other options refer to dimensions that fall outside the established range for nanoparticles, either being too large or too small.