MCQs on Form Work
Questions 1–6 — Tap an option to check your answer.
Q1: The minimum stripping time of soffit formwork to beams (props to be refixed immediately after removal of formwork) is:
Difficulty: Easy
Correct Answer: B. 7 daysSolution:As per IS 456:2000, the minimum stripping time for soffit formwork to beams (with props refixed immediately) is 7 days when using Ordinary Portland Cement.
Q2: What is the minimum period before striking the formwork to RCC slabs (with props to be refixed immediately after removal of formwork)?
Difficulty: Easy
Correct Answer: A. 3 daysSolution:As per IS 456:2000, soffit formwork to slabs may be removed after just 3 days when using OPC, provided props are refixed immediately after removing the formwork. The slab is relatively thin and lightly loaded compared to beams, so concrete gains enough strength in 3 days to hold itself between the refixed props.
Q3: Under normal conditions using an ordinary cement the period of removal of the form work is:
Difficulty: Medium
Correct Answer: D. All options are correctSolution:All three statements correctly describe IS 456:2000 minimum stripping times for OPC: (A) 7 days for beam soffits with props refixed; (B) 14 days for props to slabs spanning over 4.5 m (4.6 m falls in this category); (C) 21 days for props to beams and arches spanning over 6 m.
Q4: The shuttering of a hall measuring 4 m x 5 m, can be removed after:
Difficulty: Medium
Correct Answer: B. 7 daysSolution:The governing (controlling) span for a slab is its shorter dimension. Here the shorter span is 4 m, which is less than 4.5 m. Per IS 456:2000, props to slabs spanning up to 4.5 m may be removed after 7 days.
Q5: For walls, columns and vertical faces of all the structural members, the form work is generally removed after:
Difficulty: Easy
Correct Answer: A. 24 to 48 hoursSolution:Vertical formwork (shuttering on the sides of walls, columns, and vertical faces of beams) carries no significant load once concrete begins to set. It only holds the fresh concrete in shape. Once the concrete stiffens (16-24 hours per current IS 456, or 24-48 hours per earlier SSC JE standard), this formwork can be safely stripped. Of the options given, (a) 24 to 48 hours is the closest correct answer.
Q6: Concrete is generally placed on a:
Difficulty: Easy
Correct Answer: A. Form workSolution:Formwork (also called shuttering) is the temporary structure or mould used to contain and support freshly placed concrete until it gains sufficient strength to be self-supporting. It defines the shape of the finished concrete member. Formwork typically accounts for 20-25% of the total concrete construction cost.