Practice questions without fighting the page.

<b>Explanation</b> <ul> <li><b>Correct answer: C</b> Henri Becquerel discovered radioactivity in 1896 by observing spontaneous emission from uranium salts.</li> <li><b>Key concept:</b> Radioactivity is the spontaneous emission of radiation from unstable atomic nuclei.</li> <li><b>Why others are incorrect:</b> Marie Curie and Pierre Curie identified radioactive elements (polonium, radium) but did not discover the phenomenon. J J Thomson discovered the electron, not radioactivity.</li> <li><b>Tip:</b> Remember Becquerel’s discovery preceded the Curie’s work on isolating radioactive elements.</li> </ul>

In Quantum computing, "Qubits" are used to represent data as they can exist in multiple states simultaneously due to the principles of quantum superposition.

<b>Correct answer: D</b> <ul> <li><b>Why it’s correct:</b> Normal human blood pH is tightly regulated around 7.4 (slightly basic). The body maintains this via buffering systems and organ regulation.</li> <li>

<ul> <li><b>Correct answer: A – Wrist</b></li> <li><b>Explanation:</b> Carpal bones form the carpal (wrist) region, comprising eight small bones arranged in two rows. They connect the forearm to the hand and allow wrist movements.</li> <li><b>Key concept:</b> Anatomy of the upper limb; carpal bones = wrist bones.</li> <li><b>Why others are wrong:</b> Femur = thigh bone; Neck = part of the vertebral column or bone region; None of these = incorrect since wrist is correct.</li> <li><b>Exam tip:</b> Remember “carpal” sounds like “carpenter’s” work at the wrist; helps recall location.</li> </ul>