Question

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

Answer 1

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.