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WorksheetsDAY 31 WORKSHEET ITI (Floors )
Total questions: 15
Worksheet time: 10mins
In a framed (triple joist) timber floor, the primary load transfer path is —
Floor boards → Binders → Bridging joists → Girders
Floor boards → Girders → Binders → Bridging joists
Floor boards → Bridging joists → Binders → Girders
Floor boards → Bridging joists → Girders → Binders
In filler joist floors, the rolled steel joists primarily act in —
Compression only
Tension only
Composite bending (tension + compression)
Shear only
In jack arch floors, the spacing of mild steel joists (centre to centre) is generally —
200–300 mm
300–600 mm
800–1200 mm
1500–1800 mm
The structural glass tiles used in flooring generally have a thickness of —
2–6 mm
6–12 mm
12–30 mm
30–60 mm
In hollow block and rib floors, the minimum topping (flange) thickness at the top is generally —
20 mm
40 mm
60 mm
80 mm
True or false
In triple joist timber floors, the floor boards are laid perpendicular to the bridging joists (which generally means along the longer room direction).
True
False
True or false
In double flag-stone floor, the small rolled steel joists embedded in concrete act only as formwork and not as reinforcement.
True
False
Assertion (A): In hollow block and rib floors, hollow blocks are used mainly for reducing dead load. Reason (R): The hollow blocks act as the main compression members in flexure.
A true, R true and R is correct explanation
A true, R true but R not explanation
A true, R false
A false, R true
In single joist timber floor, when span exceeds 2.4 m, (a) is provided to strengthen the joists.
In jack arch flooring, the rise of the arch is kept as 100mm to 200 mm
True
False
Pugging plaster is a mixture of chopped (a)
The diameter of reinforcement bars in RCC floors is generally (a)
In concrete flooring, the nominal concrete mix is (a)
MATCH SET 1 — Timber Floors (Span / Support / Use)
A. Basement / Ground timber floor → 1. Spans above 7.5 m
B. Single joist timber floor → 2. Spans up to about 7.5 m
C. Double joist timber floor → 3. Supported on sleeper walls over ground
D. Triple joist timber floor → 4. Used up to ~3.6 m; provide herring-bone strutting beyond ~2.4 m
A–3, B–4, C–1, D–2
A–3, B–4, C–2, D–1
A–3, B–2, C–4, D–1
A–3, B–2, C–4, D–1
MATCH SET 2 — Composite / RCC Floors (Behavior)
A. Filler joist floor → 3. Monolithic concrete slab with steel bars
B. Jack arch floor → 4. Lightweight blocks between ribs; topping slab ≈ 50–60 mm (min)
C. RCC slab → 2. Brick arches springing between M.S. joists
D. Hollow block & rib floor → 1. Small R.S. joists encased in concrete; composite action
A–2, B–1, C–3, D–4
A–1, B–3, C–2, D–4
A–1, B–2, C–3, D–4
A–1, B–2, C–4, D–3
