Building Materials
The main constituent of cement which is responsible for initial setting of cement is

dicalcium silicate
tricalcium silicate
tricalcium aluminate
All of these

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Building Materials
A queen closer is a

Brick laid with its length parallel to the face or direction of wall
Brick laid with its breadth parallel to the face or direction of wall
Brick having the same length and depth as the other bricks but half the breadth
Brick with half the width at one end and full width at the other

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