Which of the following timbers is suitable for making sports goods ?
(A) mulberry
(B) mahogany
(C) sal
(D) deodar
The age of a tree can be known by examining_________________?
(A) cambium layer
(B) annular rings
(C) medullary rays
(D) heart wood
Crushing strength of a first class brick should not be less than_____________?
(A) 3.5 N/mm2
(B) 7.0 N/mm2
(C) 10.5 N/mm2
(D) 14.0 N/mm2
The practical limit of moisture content achieved in air drying of timber is________________?
(A) 5%
(B) 15%
(C) 25%
(D) 35%
The trunk of tree left after cutting all the branches is known as_______________?
(A) log
(B) batten
(C) plank
(D) baulk
Plywood is made by bonding together thin layers of wood in such a way that the angle between grains of any layer to grains of adjacent layers is_________________?
(A) 0°
(B) 30°
(C) 45°
(D) 90°
A first class brick when immersed in cold water for 24 hours should not absorb water more than______________?
(A) 15%
(B) 20%
(C) 22%
(D) 25%
The main function of alumina in brick earth is_______________?
(A) to impart plasticity
(B) to make the brick durable
(C) to prevent shrinkage
(D) to make the brick impermeable
First class timber has an average life of_____________?
(A) less than one year
(B) 1 to 5 years
(C) 5 to 10 years
(D) more than 10 years
The plywood______________?
(A) has good strength along the panel only
(B) can be spilt in the plane of the panel
(C) has greater impact resistance to blows than ordinary wood
(D) cannot be bent more easily than ordinary wood of same thickness