The purpose of providing frog in clay bricks is to: 

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DDA JE Civil 01 Apr 2023 Shift 2 Official Paper
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  1. form a reinforced cement column
  2. form a key for holding the mortar 
  3. circulate air in the brick wall
  4. drain out the moisture or water

Answer (Detailed Solution Below)

Option 2 : form a key for holding the mortar 
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Detailed Solution

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Explanation:

Frog is an indentation or depression on the top face of a brick made with the object of forming a key for the mortars. This reduces the weight of the brick also.

It is kept on the top face while constructing a wall so that mortar is filled properly in it.

Size of frog = 100mm × 40mm × 10mm

Depth of frog = 10mm to 20mm

Purpose of frog:

It will provide a key for holding mortar in brick masonry

It can is used for branding purpose

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