General Science important questions and answers (2023)

1. From which mineral is radium obtained–
(A) Limestone (B) Haematitie
(C) Pitchblende (D) Rutile (Ans : C)

2. What is laughing gas ?
(A) Carbon dioxide (B) Sulphur dioxide
(C) Nitrogen Dioxide (D) Nitrous oxide (Ans : D)

3. Which of the following is used as a material for making protective windows in space probes ?
(A) Steel (B) Graphite
(C) Tungsten (D) Diamond (Ans : D)

4. The gases used in different types of welding would include–
(A) Oxygen and Hydrogen (B) Oxygen, acetylene and argon
(C) Oxygen and acetylene (D) Oxygen, hydrogen and nitrogen (Ans : C)

5. Which of the following alloys is used for making magnets ?
(A) Duralumin (B) Stainless Steel
(C) Alnico (D) Magnelium (Ans : C)

6. Parmanent hardness of water may be removed by the addition of–
(A) Alum (B) Sodium Carbonate
(C) Lime (D) Potassium Permanganate (Ans : B)

7. Which of the following is the most stable element?
(A) Uranium (B) Hydrogen
(C) Oxygen (D) Lead (Ans : D)

8. Find the odd one ?
(A) Marble (B) Chalk
(C) Lime Stone (D) Slaked Lime (Ans : D)

9. Diamond is harder than graphite because of–
(A) Difference of layers of atoms (B) Tetrahedral structure of diamonds
(C) Difference of crystaline structures (D) None of these (Ans : C)

10. Which of the following has least penetrating power?
(A) Alpha particles (B) Beta particles
(C) Gamma particles (D) All have same power (Ans : A)

11. What is increasing order of the wave lengths of the following colours–
1. Orange 2. Indigo 3. Yellow 4. Violet
(A) 1, 2, 3, 4 (B) 3, 4, 1, 2
(C) 4, 3, 2, 1 (D) 4, 2, 3, 1 (Ans : D)

12. Atoms are composed of–
(A) Electrons only (B) Protons only
(C) Electrons and Protons (D) Electrons and Nuclei (Ans : D)

13. Paper is manufactured by–
(A) Wood and resin (B) Wood, Sodium and Bleaching powder
(C) Wood and bleaching powder (D) Wood, Calcium, hydrogen sulphate and resin (Ans : D)

14. Which synthetic fibre is known as artificial silk ?
(A) Cotton (B) Rayon
(C) Terylene (D) Nylon (Ans : B)

15. Deep blue colour is imparted to glass by the presence of–
(A) Iron oxide (B) Cupric oxide
(C) Nickel oxide (D) Cobalt oxide (Ans : D)

16. Which of the following gases is obtained by the reaction of water with Calcium Carbide ?
(A) Acetylene (B) Ethylene
(C) Methane (D) Water gas (Ans : C)

17. The gas liberated during the reaction of copper with dilute nitric acid is–
(A) NO₂ (B) N₂O₅
(C) O₂ (D) NO (Ans : D)

18. Which of following substances undergoes chemical change on heating ?
(A) Sodium Chloride (B) Silica
(C) Lead Nitrate (D) Platinum wire (Ans : C)

19. Starch hydrolysing enzyme is–
(A) sucrose (B) invertase
(C) amylase (D) cellulase (Ans : C)

20. The enzyme used for the formation of RNA on DNA is–
(A) DNA polymerase (B) endonuclease
(C) topoisomerase (D) RNA polymerase (Ans : D)

21. The term ‘enzyme’ was coined by–
(A) de Duve (B) Kunhe
(C) C. Darwin (D) de Candolle (Ans : B)

22. A plant cell differs from an animal cell in the absence of–
(A) mitochondria (B) centrioles
(C) ribosomes (D) endoplasmic reticulum (Ans : B)

23. A Vitamin, the absence of which leads to sterility in both males and females is–
(A) Vitamin K (B) Vitamin C or ascorbic acid
(C) Vitamin D or calciferol (D) Vitamin E or tocopherol (Ans : D)

24. Anaemia is caused in man due to the deficiency of–
(A) folic acid (B) vitamin A
(C) vitamin B₁₂ (D) none (Ans : A)

25. Rusting of iron involves–
(A) oxidation (B) reduction
(C) decomposition (D) displacement (Ans : A)

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