61. The most malleable metal is?
(A) Na2SiO3
(A) Einstein
(A) Argon
(A) Lead
(A) Rayon
(A) Felsper
(A) Steam over white hot coke
(A) Sodium
(A) Solder
77. The gas usually filled in electric bulb is?
(A) Hydrogen
79. Ascorbic acid is?
(A) Vitamin K
(A) Bees wax
(A) Silver
(B) Gold
(C) Aluminium
(C) Aluminium
(D) Sodium
(Answer : B)
62. Chemical formula of Water glass is?
62. Chemical formula of Water glass is?
(A) Na2SiO3
(B) Al2O3
(C) NaAlO2
(C) NaAlO2
(D) CaSiO3
(Answer : A)
63. Which type of fire extinguisher is used for petroleum fire?
63. Which type of fire extinguisher is used for petroleum fire?
(A) Foam type
(B) Soda acid type
(C) Powder type
(C) Powder type
(D) None of these
(Answer : C)
64. Photoelectric effect was discovered by?
64. Photoelectric effect was discovered by?
(A) Einstein
(B) Hertz
(C) Bohr
(C) Bohr
(D) Plank
(Answer : A)
65. Stainless steel is an alloy of?
(A) Iron, Carbon and Nickel
65. Stainless steel is an alloy of?
(A) Iron, Carbon and Nickel
(B) Iron and Manganese
(C) Iron, Chromium and Zinc
(C) Iron, Chromium and Zinc
(D) Iron, Chromium and Nickel
(Answer : D)
66. PVC is obtained by the polymerisation of?
(A) Propene
(Answer : D)
66. PVC is obtained by the polymerisation of?
(A) Propene
(B) Vinyl Chloride
(C) Styrene
(C) Styrene
(D) Acetylene
(Answer : B)
67. Rust is?
(Answer : B)
67. Rust is?
(A) A mixture of Fe2O3 and Fe(OH)2
(B) A mixture of FeO and Fe(OH)2
(C) FeO only
(C) FeO only
(D) A mixture of Fe2O3, 3H2O and FeO
(Answer : D)
68. Which of the following elements is obtained from sea weeds ?
(A) Argon
(B) Sulphur
(C) Vanadium
(C) Vanadium
(D) Iodine
(Answer : D)
69. Which of the following metals forms an amalgum with other metals?
69. Which of the following metals forms an amalgum with other metals?
(A) Lead
(B) Tin
(C) Zinc
(C) Zinc
(D) Mercury
(Answer : D)
70. Which of the following is commonly called a polyamide?
70. Which of the following is commonly called a polyamide?
(A) Rayon
(B) Orion
(C) Terylene
(C) Terylene
(D) Nylon
(Answer : D)
71. Which of the following is not an ore of Aluminium?
71. Which of the following is not an ore of Aluminium?
(A) Felsper
(B) Bauxite
(C) Cryolite
(C) Cryolite
(D) Azurite
(Answer : D)
72. Water gas is prepared by passing?
72. Water gas is prepared by passing?
(A) Steam over white hot coke
(B) Air over red hot coke
(C) Methane over red hot coke
(C) Methane over red hot coke
(D) Steam over heated sulphur
(Answer : A)
73. Which of the following metals react with nitrogen to form Nitride?
73. Which of the following metals react with nitrogen to form Nitride?
(A) Sodium
(B) Potassium
(C) Magnesium
(C) Magnesium
(D) None of these
(Answer : C)
74. An alloy used in making heating elements for electric heating devices is?
74. An alloy used in making heating elements for electric heating devices is?
(A) Solder
(B) Alloysteel
(C) Nichrome .
(C) Nichrome .
(D) German Silver
(Answer : C)
75. German Silver is an alloy of?
75. German Silver is an alloy of?
(A) Copper, Silver and Nickel
B) Silver, Copper and Aluminium
(C) Zinc, Copper and Nickel
(D) Silver, Zinc and Nickel
(Answer : C)
76. Which of the following substance is a bad conductor of electricity but a good conductor of heat?
76. Which of the following substance is a bad conductor of electricity but a good conductor of heat?
(A) Asbestos
(B) Celluloid
(C) Purspecks
(C) Purspecks
(D) Mica
(Answer : D)
77. The gas usually filled in electric bulb is?
(A) Hydrogen
(B) Oxygen
(C) Nitrogen
(C) Nitrogen
(D) Carbon di-oxide
(Answer : C)
78. Rubber is coagulated from latex by adding?
(A) Hydrochloric acid
(B) Acetic acid
(C) Sulphuric acid
(C) Sulphuric acid
(D) Carbonic acid
(Answer : B)
79. Ascorbic acid is?
(A) Vitamin K
(B) Vitamin B
(C) Vitamin A
(C) Vitamin A
(D) Vitamin C
(Answer : D)
80. Which of the following is the petroleum wax?
80. Which of the following is the petroleum wax?
(A) Bees wax
(B) Carnauba wax
(C) Paraffin wax
(C) Paraffin wax
(D) Jojoba wax
(Answer : C)
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