The circuit shown in the figure is:

This question was previously asked in
ESE Electronics 2014 Paper 2: Official Paper
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  1. OR gate 
  2. NOR gate 
  3. NAND gate 
  4. AND gate 

Answer (Detailed Solution Below)

Option 3 : NAND gate 
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ST 1: UPSC ESE (IES) Civil - Building Materials
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Detailed Solution

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Concept:

MOS logic circuit consists of two network transistors, a pull-down network (PDN) and a Pull-up Network (PUN) as shown:

The PDN and PUN are connected in parallel to form OR logic function and they are connected in series to form AND logic as shown:

 

Application:

Since we have the two MOS transistors connected in series, the resultant output will be the AND operation, with inverted output, i.e.

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