131. The commonly used color pigment in paints, is
132. The rocks having alumina or clay as their major constituents are known as
133. The harmonious mixing of the clay ingredients, is known as
134. The basic purpose of a retarder in concrete is
135. Rocks formed due to alteration of original structure due to heat and excessive pressure are called
136. Which of the following is the purest form of iron?
137. The most common admixture which is used to accelerate the initial set of concrete is
138. Proper amount of entrained air in concrete results in
(i) Better workability
(ii) Better resistance to freezing and thawing
(iii) Lesser workability
(iv) Less resistance to freezing and thawing
(i) Better workability
(ii) Better resistance to freezing and thawing
(iii) Lesser workability
(iv) Less resistance to freezing and thawing
139. Fibre glass
140. The base material for distemper, is
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