Stair

Minimum slope of ramp

• 1 in 30
• 1 in 20
• 1 in 10
• 1 in 50

Number of rise in a stair will be

• 1 less than number of tread
• 1 more than number of tread
• Equal to number of tread
• Depends on height of stairs

The number of steps in a flight should not be greater than :

• 10
• 12
• 15
• 14

In the case of public building the minimum width of stair is

• 100 cm
• 80 cm
• 200 cm
• 150 cm

The number of steps in a flight should not be less than

• 12 Nos
• 3 Nos
• 2 Nos
• 5 Nos

Minimum headroom provided for a stair is :

• 2.01 m
• 2.70 m
• 2.20 m
• 1.80 m

In public building the maximum riser is limited to

• 20 cm
• 10 cm
• 18 cm
• 15 cm

The sum of going in cm + twice the rise in cm of a stair is kept as :

• 30 cm
• 20 cm
• 60 cm
• 70 cm

The slope of the stair should not be more than

• 30°
• 45°
• 60°
• 90°

The pitch of the stair should be limited to :

• 30° - 45°
• 20° - 25°
• 40° - 50°
• 30° - 60°