Logic Gates And Circuits - Online Test

Test Difficulty Level: Easy

Syllabus of Test

Sample Question from this online test:

Question: A'+B'+C'=D represents a

Option A: NOR

Option B: NAND

Option C: Ex-OR

Option D: AND

To answer, click the "Start This Test" button below.

Start this Test


Ratul Chakraborty on 2009-09-30 19:10:57 wrote,

questions are too good for GATE ...

abhay srivastava on 2009-10-07 14:59:38 wrote,

please explain the answer of q. 19.

rahul gupta on 2009-10-20 10:44:42 wrote,

how 3 nor gates required to make a nand gate?

rafi md on 2009-11-13 23:20:51 wrote,

increase difficult level and include all sub

pravesh garg on 2009-11-22 15:40:52 wrote,

these question can be important for any competitive examination
.........really these are good question.............

b verma on 2010-01-07 20:07:31 wrote,

ye kaise hua??abhi to mere 50%se jyada qns sahi the??????

Manpreet Kaur on 2010-01-19 20:19:34 wrote,

please explain que no.15 .....its answer can be D too........

s vk on 2010-02-01 13:40:08 wrote,

questions are too good for GATE thanks

rajuuu rajuuu on 2010-02-09 19:16:23 wrote,

thanks for everything

jai ga on 2010-09-05 08:42:38 wrote,


mohan k on 2010-10-27 08:37:43 wrote,


panks paul on 2011-01-04 06:17:00 wrote,

very conceptual qstn.....thanx

tusar behera on 2011-01-06 11:45:05 wrote,

good questions......

need more questions

supriya sogalad on 2011-01-06 14:45:18 wrote,

I dint understand that why three nand gates ............?

harsha sharma on 2011-02-05 06:56:22 wrote,

not bad

vishal kumar on 2011-04-10 05:30:22 wrote,

good questions
but i think we can detect coincidance using ex-OR gate

Aparna hnath on 2011-05-26 13:27:48 wrote,


m b on 2011-05-28 07:08:23 wrote,

more interest on digital ckt ya its realy good comments i realy appreciate who did this i get a 80% on digital CKT From manju B ktcN3.

you ajay on 2011-06-03 09:08:07 wrote,


NITIN MAHAJAN on 2011-06-05 06:50:09 wrote,

x-or gate is anti coincedence detector because it work when both input are differ to each other


3 nand + one not gate = 1 nor gate
so we say 3 nand gate

nitin bsnl pkt

poo cha on 2011-06-13 17:28:57 wrote,

questions are easy......compared to gate

jeevitha sri on 2011-07-30 05:18:22 wrote,


Ramesh Sinha on 2011-08-04 08:48:20 wrote,

question no. 15 d is also a correct answer .

plz pay ur attention........

Amit Gupta on 2011-09-10 11:30:15 wrote,

YEAHHHHHHHHH i ACHIVED 90%...............

siva krishna yadav on 2011-12-17 11:02:23 wrote,

Great expee..

sharwari jadhav on 2012-01-14 06:27:23 wrote,

it's v gud experience.....

jagdish Tak on 2012-04-01 13:03:23 wrote,

question no 16 answer is wrong.please make sure your answer is correct.

Farhad Hossain on 2012-04-27 03:40:35 wrote,

want more question

Madhusudhan Goud on 2012-05-02 06:15:16 wrote,

Good questions but standards need to be improved... and and if possible give some questions from logic circuits

Renjini RV on 2012-05-02 13:32:44 wrote,

standard qns....but dont know the ans

stalin stalin on 2012-06-12 19:47:27 wrote,

perfect questions for gate exams

navneet kumar on 2012-07-23 04:05:09 wrote,

i don`t understand coincedence detector(q. no. 19)

kala tham on 2012-08-08 13:06:25 wrote,

i experience a lot nice

swarnim tripathi on 2012-08-11 13:19:17 wrote,

hmm without preparation...i feel its fine...next time i will prepare for it as welll.....bt for now i cn say its just satisfactory........an average!

navjot singh on 2012-08-29 14:58:52 wrote,

good questions

Sandip Padwal on 2012-10-25 13:37:15 wrote,

very very simple.....
try something tough

pattabi raman on 2012-10-30 13:03:10 wrote,

question are good

poonam kumari on 2012-12-14 13:06:56 wrote,

pls provide d explanations 4 each0 questions.... it was a good experiance

gopinath s on 2013-01-30 12:02:49 wrote,

very useful ...

MAHESH MANGAL on 2013-04-14 17:05:27 wrote,

I think the ans of q no 16 and 19 are not correct as for imp of nor with nand req not at i/ps and o/p so 2+1+1=4 is correct. and in 19 coincidence detector is Ex-Nor but not not present in options so ex-or is best suitable among present choices

pooja shelke on 2013-12-18 08:12:08 wrote,

interestig......to solve....