Select the artwork(s) which is/are attributed to Leonardo Da Vinci: [Figure: see page 11 of source PDF]

All doctors have to have a good understanding of the human body. Vijay has a good understanding of the human body. So he must be a cardiologist. Which of the following options exhibit the exact same fallacy as the statement above.

Which of the following is a/are river(s):

Which of the figures given below is/are simple rotations of the figure above. [Figure: see page 11 of source PDF]

A square is cut into 7 pieces, as shown on the extreme left of the image. Identify which of the options can be made using all 7 pieces. [Figure: see page 12 of source PDF]

Identify which of the options given below can be folded to make the 3D object shown in the box. [Figure: see page 10 of source PDF]

Identify which of the options given below can be folded to make the 3D object in the picture shown on the left. [Figure: see page 12 of source PDF]

A recent survey among concertgoers found that smaller, older halls sound better for symphony orchestras, as compared to bigger, modern ones. What is/are the reason(s) for this?

Shown in the image are schematic diagrams of folding chair structures. If the black dots indicate a hinged joint, identify the structure(s) that will work as a folding chair. [Figure: see page 12 of source PDF]