# Match the following types of formworks with their minimum required striking period. a. 16-24 hours 1. Soffit formwork to slabs b. 7 days 2. Props to b

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Match the following types of formworks with their minimum required striking period.

 a. 16-24 hours 1 Soffit formwork to slabs b. 7 days 2 Props to beams and arches spanning up to 6 m c. 14 days 3 Vertical formwork to columns, walls, and beams d. 3 days 4 Props for slabs spanning up to 4.5 m

1. a - 3, b - 2, c - 4, d - 1
2. a - 4, b - 3, c - 2, d - 1
3. a - 3, b - 4, c - 2, d - 1
4. a - 3, b - 4, c - 1, d - 2

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Correct Answer - Option 3 : a - 3, b - 4, c - 2, d - 1

Concept:

As per IS 456:2000, the minimum period before striking formwork is as follows:

 Type of Formwork Minimum Period Before Striking Formwork Vertical formwork to columns, walls, beams. 16 - 24 h (1 Day) Soffit formwork to slabs 3 days Soffit formwork to beams 7 days Props to slabs a. Spanning up to 4.5 m b. Spanning over 4.5 m 7 days 14 days Props to beams and arches a. Spanning up to 6 m b. Spanning over 6 m 14 days 21 days

Hence, Option C is correct.