# VLSI Questions and Answers – Design Using CIF Code

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This set of VLSI Multiple Choice Questions & Answers (MCQs) focuses on “Design Using CIF Code”.

1. Caltech intermediate form code is a
a) low-level graphic language
b) low-level textual language
c) high-level graphic language
d) high-level textual language

Explanation: Caltech intermediate form code is a low-level graphic language used to specify geometry of integrated circuits.

2. CIF generates code which are
a) high-level language
b) assembly level language
d) very high-level language

Explanation: CIF code is to communicate chip geometry in a standard machine readable form for mask-making.

3. CIF code is compatible with
a) low system geometry
b) large system geometry
c) both low and large system geometry
d) medium system geometry

Explanation: CIF code is reasonable compact and can cope with both low and large system geometry. It is easily readable.

4. Design through CIF is done using
a) color codes
b) geometric shapes
c) different layer thickness
d) transistors

Explanation: In Caltech intermediate form code, the design is given using geometric shapes. Boxes, polygons and wires are readily defined.

5. The CIF dimensions are given in the form of
a) X,Y coordinates
b) lambda form
c) millimeter form
d) alpha form

Explanation: The CIF dimensions and positions are given in X, Y coordinate form but are in absolute dimension units and not in lambda form.

6. Polygons in CIF are specified in terms of
a) length
b) width
c) vertices
d) angles

Explanation: In CIF, polygons(P) are specified in terms of vertices in order. An n-sided polygon needs n vertices and a connection between first and last.

7. Wires are specified in terms of
a) vertices
b) width
c) angles
d) lengths

Explanation: Wires(W) are specified in terms of their width followed by the center line’s coordinates of the wire’s path.

8. CIF can also accommodate rotations and translations.
a) true
b) false

Explanation: CIF also accommodates cells and rotations and translations etc along with geometrical shaped designs.

9. If vector coordinate is (1,0) it indicates that
a) length is parallel to y-axis
b) length is parallel to x-axis
c) width is parallel to y-axis
d) width is parallel to x-axis

Explanation: If the vector coordinate is (1,0), it denotes that the length will be parallel to the x-axis. The direction is always assumed parallel to the length.

10. In which layer the geometrical structures exist?
a) metal
b) silicon
c) silicide
d) diffusion 