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151.

According to Indian standard specifications, the concrete should be cured under a humidity of

A.	30%	B.	50%
C.	70%	D.	90%

152.

According to Indian standard specifications, the temperature for curing is

A.	5?C	B.	10?C
C.	27?C	D.	42?C

153.

The slump test of concrete is used to measure its

A.	consistency	B.	tensile and compressive strength
C.	impact value	D.	homogeneity

154.

The central part of a tree is called

A.	heart wood	B.	pith
C.	sap wood	D.	cambium layer

155.

The thin radial fibres extending from the pith to the cambium layer is called medullary rays.

Yes

156.

The defect caused due to over-maturity and unventilated storage of the wood during its transit, is called

A.	knot	B.	rind gall
C.	foxiness	D.	heart shake

157.

The defect caused by imperfect seasoning, is called

A.	wet rot	B.	dry rot
C.	honeycombing	D.	cup shake

158.

Seasoning of tunber

A.	increases the weight of timber	B.	improves strength properties of timber
C.	does not give dimensional stability	D.	all of these

159.

The purpose of seasoning of timber is to

A.	change the direction of grains	B.	remove voids
C.	reduce moisture content	D.	all of these

160.

The moisture content in timber for framework should not exceed

A.	5%	B.	10%
C.	15%	D.	20%