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Worksheets06/01/2026 AE TIMBER-MARKET FORMS, CODES
Total questions: 10
Worksheet time: 5mins
A timber has an average service life of 9.5 years in ground contact. Its durability class under IS 399 is:
Low
Moderate
High
Depends on species
A timber beam is seasoned perfectly and preserved chemically, yet still shows excessive deflection under service load. The MOST probable cause is:
A) Low durability class
B) Poor seasoning method
C) Low Modulus of Elasticity
D) Incorrect preservative
Which engineered timber product becomes denser than water?
Impreg timber
Fibre board
Compreg timber
Particle board
Which property improvement is primarily responsible for plywood’s dimensional stability?
Resin type
Veneer thickness
Cross-graining
Number of plies
Particle board is preferred when:
Load-bearing capacity is critical
Cost outweighs strength and durability
Exposure to moisture is high
Thermal resistance is required
Consider the following:
A timber classified as Group A (IS 399) is always suitable for structural use.
Moisture content limits for beams are higher than for door/window frames.
Which is correct?
A) 1 only
2 only
Both
Neither
Statements: IS 1708 specifies laboratory testing of timber. IS 4970 helps identify timber species. Correct option:
1 only
2 only
Both
Neither
A timber specimen shows high initial stiffness but fails suddenly without large deformation. From an engineering design perspective, this behaviour is MOST critical when timber is classified based on:
A) Durability class
B) Availability group
C) Modulus of Elasticity group
D) Moisture content range
Which timber product is LEAST suitable for use as a load-bearing member, even if protected from moisture?
A) Glulam
B) Compreg timber
C) Plywood
D) Particle board
Consider the statements:
Increasing the number of veneers in plywood always increases bending strength.
Cross-lamination reduces anisotropy in timber products.
Which is correct?
A) 1 only
B) 2 only
C) Both 1 and 2
D) Neither
