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Verification Engineer Interview Questions

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You have 2 pieces of rope, each of which burns from one end to the other in 30 minutes (no matter which end is lit). If different pieces touch, the flame will transfer from one to the other. You cannot assume any rope properties that were not stated. Given only 1 match, can you time 45 minutes?

49 Answers

Take one rope (Rope A), place it down as a circle. Light match and start burning rope A at the tips that are touching. When the rope completely burns out, 15 minutes will have passed (since both ends are burning and being consumed at once). Hold the second rope (Rope B) straight and place one end so that it will immediately catch fire when the two burning points from (Rope A) finally touch and are just about to burn out. Thus 15 minutes on Rope A + 30 minutes on Rope B gives you 45 mins.

How about this: Fold the first rope double so the ends touch. Lay it down and lay the second rope so it touches the fold of the first rope. Light the ends of the first rope. After 15 minutes the second rope should ignite. Once second rope finishes burning it is 45 minutes. Same principle as above, I just don't want to sit there for 15 minutes in order to light the second rope.... :-)

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You have seven stones and a weighing scale. Six of the stones are equal in weight and one is lighter. How will you figure out which one is lighter ? Minimum tries required to do so ?

5 Answers

Create a 8 input AND gate using 3 4:1 muxes

7 Answers

Describe a circuit that implements the following truth table using only NAND gates. A B OUT 0 0 1 0 1 1 1 0 0 1 1 1

6 Answers

Describe a function to check if an integer is a power of 2.

5 Answers

how do you build a mux out of xor gates?

3 Answers

How would you turn a 2:1 MUX into an AND gate?

3 Answers

List an application (computer) where the properties of caching cannot be used.

2 Answers

What are the five stages of a classic RISC pipeline?

2 Answers

Write the base-11 representation of the decimal number 175.

4 Answers
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