Prepare effectively for Assam government competitive exams like APSC, ADRE, TET, B.Ed , and various other recruitment tests with the Top 50 Basic Science MCQs. This comprehensive collection covers Assam’s history all updated and curated to boost your exam success
1. The lightest gas known is:
Answer: c) Hydrogen
Explanation: Hydrogen is the lightest element and gas, with the lowest density among all gases.
2. Which element is commonly called ‘Quick Silver’?
Answer: a) Mercury
Explanation: Mercury is also known as Quick Silver due to its silvery appearance and liquid state at room temperature.
3. What is the chemical formula for washing soda?
Answer: a) Na₂CO₃
Explanation: Washing soda is sodium carbonate (Na₂CO₃), used as a cleaning agent.
4. Which acid is present in lemon?
Answer: a) Citric acid
Explanation: Lemon juice contains citric acid, giving it a sour taste.
5. Rusting of iron is an example of:
Answer: b) Redox reaction
Explanation: Rusting involves oxidation of iron and reduction of oxygen, making it a redox process.
6. Which metal is liquid at room temperature?
Answer: b) Mercury
Explanation: Mercury is the only metal that is liquid at standard room temperature.
7. Which gas is used in fire extinguishers?
Answer: c) Carbon dioxide
Explanation: CO₂ displaces oxygen and cools the fire, extinguishing it.
8. pH value of pure water at 25°C is:
Answer: b) 7
Explanation: Pure water is neutral at 25°C with a pH of 7.
9. Which chemical is used for artificial ripening of fruits?
Answer: a) Calcium carbide
Explanation: Calcium carbide releases acetylene, which accelerates ripening.
10. Which of the following is an alloy of copper and zinc?
Answer: b) Brass
Explanation: Brass is an alloy made by combining copper and zinc.
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