JEE Main Paper 2A (B.Arch.): Mathematics, Aptitude and Drawing
JEE Main Paper 2A (B.Arch.) is the architecture route. It combines Mathematics and an Aptitude Test with a Drawing Test, so it rewards spatial visualization, visual memory and freehand drawing as well as calculation.
Structure and marking
Mathematics and Aptitude are objective sections with negative marking. The Drawing Test is a small number of questions (commonly two) where you produce sketches in the answer booklet. Drawing is judged on proportion, perspective, line quality, composition and adherence to the brief, not on artistic flourish alone. The Aptitude Test covers 3D perception, mirror/water images, rotations, paper folding, surface counting, architectural awareness and building materials.
Core concepts
Plan, elevation and section are different projections: a plan is a top view, an elevation is a front/side view, and a section is a cut view. Scale is a ratio; areas scale by the square of the linear scale factor. Perspective uses vanishing points; two-point perspective is standard for building corners. Architectural awareness includes famous monuments, their cities and styles.
Worked example
A room measures 8 cm × 6 cm on a 1:50 plan. Actual dimensions: 8×50=400 cm=4 m and 6×50=300 cm=3 m. Actual area = 4×3=12 m². Do not multiply the paper area by 50; the area factor is 50²=2500.
Traps that cost marks
Mixing up plan and elevation; applying the scale once to an area; drawing without faint construction lines; spending too long on one sketch; and guessing negative-marked aptitude questions. In mirror-image items, check whether the question asks for a mirror or a rotation.