154) The effective height of free standing nonload bearing wall and column respectively will be [where H is the height of wall or column between centers of supports.]

155) If H is the height of wall between centers of supports, then the effective height of wall where concrete floors have a bearing on wall irrespective of the direction of span will be

156) The thickness of each leaf of a cavity wall shall not be less than

157) If the horizontal cross-sectional area of a wall is 1200 cm2, then the basic stress shall be multiplied by a reduction factor equal to

158) A free standing brick wall 20 cm thick is subjected to a wind pressure of 75kg/m2. The maximum height of wall from stability consideration is