Here are the most frequently asked general science questions in General knowledge section of exams. The general science questions include Physics, Chemistry and Biology. These questions will be useful for your practice for TNPSC exams, UPSC exams, state PSC exams, entrance exams, bank exams, NEET exam (National Eligibility and Entrance Test) or any other competitive exams

1. Which of the following is the lightest metal?

(A) Mercury (B) Silver

(C) Lithium (D) Lead (Ans: C)

2. The most important ore of Aluminium is–

(A) Bauxite (B) Calamine

(C) Calcite (D) Galena (Ans: A)

3. The element present in the largest amount in rocks and minerals is–

(A) Carbon (B) Silicon

(C) Hydrogen (D) Aluminium (Ans: B)

4. The chemical name of Uria is–

(A) Aneurin (B) Chloroethane

(C) Carbamide (D) None of these (Ans: C)

5. Permanent hardness of water can be removed by adding–

(A) Potassium Permanganate (B) Chlorine

(C) Bleaching Powder (D) Washing Soda (Ans: D)

6. The formula of Plaster of Paris is–

(A) CaSO4 (B) CaSO4, 2H2O

(C) 2CaSO4, 4H2O (D) 2CaSO4, H2O (Ans : D)

7. Liquefied Petroleum gas (LPG) consists of mainly–

(A) Methane, Ethane and Hexane (B) Ethane, Hexane and Nonane

(C) Methane, Butane and Propane (D) Methane, Hexane and Nonane (Ans: C)

8. The metal that is present in Photo Films is–

(A) Mercury (B) Platinium

(C) Magnesium (D) Silver (Ans: D)

9. Which of the following is in liquid form at room temperature?

(A) Cerium (B) Sodium

(C) Francium (D) Lithium (Ans: C)

10. The property of a substance to absorb moisture from the air on exposure is called–

(A) Osmosis (B) Desiccation

(C) Efflorescence (D) Deliquescence (Ans: D)

11. Brass gets discoloured in air due to the presence of which gas in air–

(A) Carbon dioxide (B) Oxygen

(C) Hydrogen Sulphide (D) Nitrogen (Ans: C)

12. Quartz crystals normally used in quartz clocks etc. is chemically–

(A) Sodium Silicate (B) Silicon dioxide

(C) Germanium dioxide (D) A mixture of (B) and (C) (Ans: B)

13. Which of the following elements is non-radioactive?

(A) Uranium (B) Thorium

(C) Plutonium (D) Zirconium (Ans: D)

14. According to Dalton’s atomic theory, the smallest particle which can exist independently is–

(A) An atom (B) A molecule

(C) A cation (D) An anion (Ans: A)

15. The recent atomic weight scale is based on–

(A) 1H1 (B) 1H2

(C) 6C12 (D) 8O16 (Ans : C)

16. The major ingredient of leather is–

(A) Carbohydrate (B) Collagen

(C) Polymer (D) Nucleic acid (Ans: B)

17. Glass is made from the mixture of–

(A) Quartz and mica (B) Sand and salt

(C) Sand and silicates (D) None of these (Ans: C)

18. Epoxy resins is used as–

(A) Moth repellents (B) Insecticides

(C) Detergents (D) Adhesives (Ans: D)

19. One fathom is equal to–

(A) 6 metres (B) 6 feet

(C) 60 feet (D) 60 cms (Ans: B)

20. What is the unit for measuring the pitch or frequency of sound?

(A) Coulomb (B) Hum

(C) Cycles (D) Decibel (Ans: D)

21. The fastest acting enzyme in the biological kingdom is–

(A) lipase (B) amylase

(C) carboxypeptidase (D) carbonic anhydrase (Ans: D)

22. Lightning cause rainfall because–

(A) It cause combination of oxygen and nitrogen (B) Some of the gas molecules become bigger

(C) It activate H2O molecule (D) Photo-electricity reaction starts (Ans: C)

23. Nitrification means–

(A) Liquefaction of nitrogen (B) Converts the atmospheric nitrogen to effective nitrogen compound.

(C) Production of nitrogen from air (D) Conversion of nitrogen to nitric acid. (Ans: B)

24. Cell membrane is–

(A) permeable (B) selectively permeable

(C) semipermeable (D) impermeable (Ans: C)

25. Polythene is industrially prepared by the polymerization of–

(A) methane (B) styrene

(C) acetylene (D) ethylene (Ans : D)

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