1. Eka boron : Scandium :: Eka Aluminum : _________
Ans: Eka boron : Scandium :: Eka Aluminum : Gallium
2. Mendeleev’s periodic table : atomic mass :: Modem periodic table : _________
Ans: Mendeleev’s periodic table : Atomic mass :: Modem periodic table : Atomic number
3. Group 1 and 2 : s block :: group 13 and 18 : _________
Ans: Group 1 and 2 : s block :: group 13 and 18 : p Block
4. Group 13 to 18 : p block :: _________ d block
Ans: Group 13 to 18 : p block :: Group 3 to 12 : d block
5. Two elements in the same position : demerit of Newland’s octaves :: place for Isotopes : _________
Ans: Two elements in the same position : demerit of Newland’s octaves :: place for Isotopes : Demerits of Mendeleev’s periodic table
6. Beryllium : alkaline earth metal:: sodium: _________
Ans: Beryllium : alkaline earth metal :: sodium: Alkali metal
7. Cl: halogen group :: Ar : _________
Ans: Cl : halogen group :: Ar : zero group
8. Iodine : solid :: bromine : _________
Ans: Iodine : solid :: bromine : liquid
9. Electric motor : converts electrical energy into mechanical energy :: Electric generator: _________
Ans: Electric motor : converts electrical energy into mechanical energy :: Electric generator : converts mechanical energy into electrical energy
10. Fleming’s left hand rule : electric current :: Fleming’s right hand rule : _________
Ans: Fleming’s left hand rule : electric current :: Fleming’s right hand rule : direction of induced current
11. Alternating current: oscillatory :: Direct current: _________
Ans: Alternating current: oscillatory :: Direct current: non-oscillatory
12. When ice is converted into water : constant temperature :: before the water boils : _________
Ans: When ice is converted into water : constant temperature :: before the water boils : temperature is increasing
13. Relative humidity greater than 60% : humid air :: relative humidity less than 60% : _________
Ans: Relative humidity greater than 60% : humid air :: relative humidity less than 60% : dry air
14. While studying anomalous behaviour of water in Hope’s apparatus, the upper temperature of the thermometer : 0 °C :: lower temperature of the thermometer :_________
Ans: While studying anomalous behaviour of water in Hope’s apparatus, the upper temperature of the thermometer : 0 °C :: lower temperature of the thermometer : 4 °C
15. The density of water is high at 4 °C : anomalous behaviour of water :: shredded ice converted into solid ice balls : _________
Ans: The density of water is high at 4 °C : anomalous behaviour of water :: shredded ice converted into solid ice balls : Regelation
16. Specific latent heat of vaporisation : J/kg :: specific heat: _________
Ans: Specific latent heat of vaporisation : J/kg :: specific heat: J/kg °C
17. 2n1: Refractive index of medium 2 with respect to medium 1 :: 1n2 : _________
Ans: 2n1: Refractive index of medium 2 with respect to medium 1 :: 1n2 : Refractive index of medium 1 with respect to medium 2
18. Refractive index of air : 1.0003 :: refractive index of water : ________
Ans: Refractive index of air : 1.0003 :: refractive index of water : 1.33
19. Convex lens : converging :: concave lens : ________
Ans: Convex lens : converging :: concave lens : diverging
20. Nearsightedness: elongated eyeball:: farsightedness: ________
Ans: Nearsightedness: elongated eyeball :: farsightedness: flattening of eye ball
21. Object at 2F1 of a convex lens : Image at 2F2:: Object at F1 :________
Ans: Object at 2F1 of a convex lens : Image at 2F2 :: Object at F1 : Image at infinity
22. Nearsightedness : concave lens :: farsightedness : ________
Ans: Nearsightedness : concave lens :: farsightedness : convex lens
23. Simple microscope : Number of convex lens one :: compound microscope : ________
Ans: Simple microscope : Number of convex lens one :: compound microscope : Number of convex lenses two
24. Focal length : metre :: power of lens : ________
Ans: Focal length : metre :: power of lens : diopter
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27. Stainless steel: Iron, chromium and carbon : : Bronze : _______
Ans: Stainless steel: Iron, chromium and carbon :: Bronze : Copper and tin
28. Pressure cooker : Anodizing : : Silver plated spoons : _______
Ans: Pressure cooker : Anodizing : : Silver plated spoons : Electroplating
29. In Electrolytic reduction of alumina, Anode : _______ :: Cathode : Graphite lining
Ans: In Electrolytic reduction of alumina, Anode : Set of carbon (graphite) rods :: Cathode : Graphite lining
30. Sulphide ores : Roasting : : Carbonate ores : _______
Ans: Sulphide ores : Roasting : : Carbonate ores : Calcination
31. Bauxite : Aluminium ore : : Cassiterite : _______
Ans: Bauxite : Aluminium ore : : Cassiterite : Tin
32. Metal sheets : Malleable : : Electric wires : _______
Ans: Metal sheets : Malleable : : Electric wires : Ductile
33. Zinc sulphide : Roasting : : zinc carbonate : _______
Ans: Zinc sulphide : Roasting : : zinc carbonate : calcination
34. Rusting of iron : Fe2O3 : : corrosion of copper : _______
Ans: Rusting of iron : Fe2O3 : : corrosion of copper : CuCO3
35. Diamond : electric insulator :: _______ : electric conductor
Ans: Diamond : electric insulator :: graphite : electric conductor
36. Soft metal : Na : : hard metal : _______
Ans: Soft metal: Na : : hard metal: Tungsten
37. Aluminium: _______ : gold : : electric insulator
Ans: Aluminium: electric conductor : gold : : electric insulator
38. Bronze : _______ :: Stainless steel: Fe + Cr + C
Ans: Bronze : Cu + Sn :: Stainless steel: Fe + Cr + C
39. Solid : iodine :: _______ : bromine
Ans: Solid : iodine :: liquid : bromine
40. CH3-CH2-CHO : propanal:: CH3-COOH : _______
Ans: CH3-CH2-CHO : propanal :: CH3-COOH : ethanoic acid
41. Ketone :-CO- :: Ester : _______
Ans: Ketone : -CO- :: Ester : -COO-
42. Cyclohexane : Cyclic hydrocarbon :: Isobutylene :_______
Ans: Cyclohexane : Cyclic hydrocarbon :: Isobutylene : Branched hydrocarbon
43. Saturated hydrocarbon : Single bond :: Unsaturated hydrocarbon : _______
Ans: Saturated hydrocarbon : Single bond :: Unsaturated hydrocarbon : Double and/or triple bond
44. Saturated carbon compounds : blue flame :: Unsaturated carbon compounds : _______
Ans: Saturated carbon compounds : blue flame :: Unsaturated carbon compounds : Yellow flame