Which of the following represents a metamorphic rock? (1) slate (2) shale (3) quartzite . The correct answer is___________?

A. only (3)
B. both (1) and (3)
C. both (2) and (3)
D. all (1), (2) and (3)

Plywood has the advantage of_____________?

A. greater tensile strength in longer direction
B. greater tensile strength in shorter direction
C. same tensile strength in all directions
D. none of the above

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

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 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

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%

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°

The trunk of tree left after cutting all the branches is known as_______________?

A. log
B. batten
C. plank
D. baulk

The practical limit of moisture content achieved in air drying of timber is________________?

A. 5%
B. 15%
C. 25%
D. 35%

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