Practice Chemistry MCQs for BPSC General Posts (Balochistan) Everyday Science — topic-wise sets with solved answers.
Q1. The most abundant element in the Earth's crust is:
Answer: Oxygen
Explanation: Oxygen is the most abundant element in the Earth's crust by mass, making up about 46% of crustal weight, primarily in the form of oxides and silicates.
Q2. Which of the following is an organic molecule needed by the body in small amounts?
Answer: Vitamin C
Explanation: Vitamins are organic micronutrients required in small amounts for normal metabolic function; Vitamin C (ascorbic acid) is a classic example of such an organic molecule.
Q3. Existence of an element in more than one form in the same physical state is called:
Answer: Allotropy
Explanation: Allotropy is the scientifically accurate choice. The concept tested here is core everyday science for MDCAT, ECAT, and general ability papers.
Q4. What is the subatomic particle detected for the first time in 2015 by the European Organization for Nuclear Research?
Answer: Pentaquark
Explanation: In July 2015, CERN's LHCb experiment announced the discovery of pentaquarks - exotic hadrons composed of five quarks - not previously observed as a stable particle state.
Q5. Which of the following elements is not present abundantly in the Earth's crust?
Answer: Radium
Explanation: Radium is an extremely rare radioactive element with a crustal abundance of only about 1 part per trillion, far less abundant than silicon, aluminum, or carbon.
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