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TNPSC General Science - Important Questions & Answers (61-80)

61. The most malleable metal is?

(A) Silver 
(B) Gold
(C) Aluminium 
(D) Sodium

(Answer : B)

62. Chemical formula of Water glass is?

(A) Na2SiO3 
(B) Al2O3
(C) NaAlO2 
(D) CaSiO3 

(Answer : A)

63. Which type of fire extinguisher is used for petroleum fire?

(A) Foam type 
(B) Soda acid type
(C) Powder type 
(D) None of these 

(Answer : C)

64. Photoelectric effect was discovered by?

(A) Einstein 
(B) Hertz
(C) Bohr 
(D) Plank 

(Answer : A)

65. Stainless steel is an alloy of?

(A) Iron, Carbon and Nickel 
(B) Iron and Manganese
(C) Iron, Chromium and Zinc 
(D) Iron, Chromium and Nickel

(Answer : D)

66. PVC is obtained by the polymerisation of?

(A) Propene 
(B) Vinyl Chloride
(C) Styrene 
(D) Acetylene

(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 
(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 
(D) Iodine

(Answer : D)

69. Which of the following metals forms an amalgum with other metals?

(A) Lead 
(B) Tin
(C) Zinc 
(D) Mercury 

(Answer : D)

70. Which of the following is commonly called a polyamide?

(A) Rayon 
(B) Orion
(C) Terylene 
(D) Nylon 

(Answer : D)

71. Which of the following is not an ore of Aluminium?

(A) Felsper 
(B) Bauxite
(C) Cryolite 
(D) Azurite

(Answer : D)

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 
(D) Steam over heated sulphur 

(Answer : A)

73. Which of the following metals react with nitrogen to form Nitride?

(A) Sodium 
(B) Potassium
(C) Magnesium 
(D) None of these 

(Answer : C)

74. An alloy used in making heating elements for electric heating devices is?

(A) Solder 
(B) Alloysteel
(C) Nichrome .
(D) German Silver 

(Answer : C)

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?

(A) Asbestos 
(B) Celluloid
(C) Purspecks 
(D) Mica 

(Answer : D)

77. The gas usually filled in electric bulb is?

(A) Hydrogen 
(B) Oxygen
(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 
(D) Carbonic acid 

(Answer : B)

79. Ascorbic acid is?

(A) Vitamin K 
(B) Vitamin B
(C) Vitamin A 
(D) Vitamin C 

(Answer : D)

80. Which of the following is the petroleum wax?

(A) Bees wax 
(B) Carnauba wax
(C) Paraffin wax 
(D) Jojoba wax


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