JKSSB Science MCQs with PDF Download Here Free
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These are most important mcqs on general science asked by JKSSB,UPSC, ssc and in multiple exams. You can revise the mcq of general science for Various exams like FAA, vlw, junior assistant etc. For download ebook you can request to author for the pdf of this article.
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CHEMISTRY
31. What happens when a copper rod is dipped in iron sulphate solution?
A. No reaction takes place
B. Blue color of copper sulphate solution is obtained
C. Copper displaces iron
D. Reaction is exothermic
Answer: A – No reaction takes place
32. Combination of phosphorus and oxygen is an example of:
A. Oxidation
B. Reduction
C. Rancidity
D. None of these
Answer: A – Oxidation
33. _________ elements are non-metal.
A. Electro-positive
B. Electro-negative
C. Neutral
D. None of these
Answer: B – Electro-negative
34. The Chemical name of ‘Washing Soda’ is ______.
A. Sodium bicarbonate
B. Sodium oxide
C. Sodium carbonate
D. Sodium hydroxyl
Answer: C – Sodium carbonate
35. The composition of Aspirin is:
A. Diacetylsalicyclic acid
B. Acetylsalicyclic acid
C. Triacetyldisalicyclic acid
D. Acetyldisalicyclic acid
Answer: B- Acetylsalicyclic acid
36. What is the chemical name of Plaster of Paris?
A. Calcium oxide
B. Calcium sulphate
C. Calcium dioxide
D. Calcium nitrate
Answer: B – Calcium sulphate
37. In an oxidation process _________ happens.
A. Gain of electrons
B. Loss of electrons
C. No change in electrons
D. Gain or loss of electrons
Answer: B – Loss of electrons
38. Aluminium is extracted from which ore?
A. Magnetite
B. Bauxite
C. Siderite
D. Haematite
Answer: B – Bauxite
39. Which of the following pairs will give dis-placement reactions?
A. FeSO4 solution and copper metal
B. AgNO3 solution and copper metal
C. CuSO4 solution and silver metal
D. NaCl solution and copper metal
Answer: B – AgNO3 solution and copper metal
40. If the dispersed phase is a liquid and the dispersion medium is solid, the colloid is known as
A. Foam
B. Sol
C. Emulsion
D. Gel
Answer: D -Gel
41. When a catalyst is added to the system, the:
A. Equilibrium concentrations are increased
B. Equilibrium concentrations are unchanged
C. The rate of forward reaction is increased and that of backward reaction is decreases
D. Value of the equilibrium constant is decreased
Answer: B – Equilibrium concentrations are unchanged
42. Which of the following properties is generally not shown by metals?
A. Electrical conduction
B. Sonorous in nature
C. Dullness
D. Ductility
Answer: C- Dullness
43. The ability of metals to be drawn into thin wire is known as:
A. Ductility
B. Malleability
C. Sonorousity
D. Conductivity
Answer: A – Ductility
44. Which one of the following metals do not react with cold as well as hot water?
A. Na
B. Ca
C. Mg
D. Fe
Answer: D – Fe
45. Silver articles become black on prolonged exposure to air. This is due to the formation of:
A. Ag3N
B. Ag2O
C. Ag2S
D. Ag2S and Ag3N
Answer: C – Ag2S
46. Blood contains:
A.Positively charged particles
B. Negatively charged particles
C. Neutral particles
D. Negatively as well as positively charged particles
Answer: B – Negatively charged particles
47. In stainless steel, iron is mixed with
A. Ni and Cr
B. Cu and Cr
C. Ni and Cu
D. Cu and Au
Answer: A. Ni and Cr
48. Which one of the following metals is found in liquid state at room temperature?
A. Na
B. Fe
C. Cr
D. Hg
Answer: A – Na
49.Which of the following non-metal is lustrous?
A. Sulphur
B. Oxygen
C. Nitrogen
D. Iodine
Answer: D.- Iodine
50. Which among the following alloys contain non-metal as one of its constituents?
A. Brass
B. Bronze
C. Amalgam
D. Steel
Answer: D- Steel
51. Although metals form basic oxides, which of the following metals form an amphoteric oxide?
A. Na
B. Ca
C. Al
D. Cu
Answer: C – Al
52. Which of the following non-metals is a liquid?
A. Carbon
B. Bromine
C. Phosphorus
D. Sulphur
Answer: B – Bromine
53. Which of the following can undergo a chemical reaction?
A. MgSO4 + Fe
B. ZnSO4 + Fe
C. MgSO4 + Pb
D. CuSO4 + Fe
Answer: D – CuSO4 + Fe
54. Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is
A. 1:1
B. 2:1
C. 4:1
D. 1:2
Answer: B – 2:1
55. Which of the following are exothermic processes?
(i) Reaction of water with quicklime
(ii) Dilution of an acid
iii) Evaporation of water
(iv) Sublimation of camphor (crystals)
A. (i) and (ii)
B. (ii) and (iii)
C. (i) and (iv)
D. (iii) and (iv)
Answer: A – (i) and (ii)
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