Friday, February 28, 2020

WBCS Polity and Constitution MCQs Prelims and Mains

class 10 Chemistry mcq questions pdf For UPSC | SSC | Rail | RRB | State PSC P18

Chemistry - 18

86. The most malleable metal is
(A) Iron
(B) Gold
(C) Platinum
(D) Silver

Correct Answer: [B] Gold.
87. The white vitriol is
(A) MgSO4 , 7H2O
(B) CuSO4 , 5H2O
(C) FeSO4 , 7H2O
(D) ZnSO4 , 7H2O

Correct Answer: [D] ZnSO4 , 7H2O.
88. Rate of radiation of heat from a body is the highest if its surface is
(A) Smooth but black
(B) Rough but black
(C) White
(D) Smooth

Correct Answer: [A] Smooth but black.
89. Galvanization is deposition of
(A) tin on iron
(B) copper on iron
(C) zinc on iron
(D) aluminum on iron

Correct Answer: [C] zinc on iron.
90. How many grams of NaOH are needed to make 100 ml. of a 0.5 M solution of NaOH (Atomic weight : Na = 23, O=16, H=1)
(A) 4
(B) 1
(C) 2
(D) 20

Correct Answer: [C] 2.


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