Saturday, December 19, 2015

Apply Online for All India Pre-Medical/Pre-Dental Entrance Test (AIPMT) 2016



You can now apply for All India Pre-Medical/Pre-Dental Entrance Test (AIPMT) 2016.
Application for AIPMT 2016 can be submitted online only and the last date for submitting the application without late fee is 8th January 2016, if you pay the fee using e-challan.
Using other modes of payment you can submit the application without late fee up to 12th January 2016.
The last date for submitting the application with late fee is 6th February 2016, if you pay the fee using e-challan.
Using other modes of payment you can submit the application with late fee up to 10th February 2016.
    The Entrance Test which will be conducted from 10 am to 1 pm on 1st May, 2016 (Sunday) will have one paper with 180 objective type questions from Physics, Chemistry and Biology (Botany & Zoology).
You may visit the AIPMT site at http://aipmt.nic.in for all details.

You can access many old AIPMT questions (with solution) on this site by clicking on the label AIPMT below this post.

Saturday, November 21, 2015

Apply for JEE Main 2016



Joint Entrance Examination (Main) – 2016 [JEE Main 2016] will be conducted on April 3, 2016 (Sunday) (Pen & Paper Based Examination) and on April 9, 2016 (Saturday) & April 10, 2016 (Sunday) (Computer Based Examination).

The aspiring candidates have to apply online only through JEE (Main) website www.jeemain.nic.in.

The online application process will start on 1st December, 2015 and will end on 31st December, 2015.

You may visit the JEE Main site www.jeemain.nic.in for complete information.

Thursday, June 18, 2015

Digital Circuits - Two Questions on Logic Gates



“God used beautiful mathematics in creating the world.”
– P. A. M. Dirac




All India Pre-Medical/Pre-Dental Entrance Test (AIPMT) held on 3rd May, 2015 has been cancelled by the Supreme Court. A fresh test will be conducted by the Central Board of Secondary Examination (CBSE), in accordance with the Supreme Court Judgment of June 15.

            Today we shall discuss two questions on digital circuits. The first question appeared in the test paper of the cancelled AIPMT 2015. The second question is a variation of the first question. Both are single correct answer type multiple choice questions. Here are the questions:

(i) Which logic gate is represented by the following combination of logic gates?


(1) NAND

(2) AND

(3) NOR

(4) OR

Note that A and B are the inputs applied to two inverters (NOT gates) and Y1 and Y2 are their outputs.which are applied to the input side of a two input NOR gate. Y is the final output of the combination. You can easily solve this question by writing the truth table which is given below:

A    B     Y

0     0    0

0     1    0

1     0    0

1     1     1

The combination evidently implements AND operation. So the correct option is (2).

(ii) Which logic gate is represented by the following combination of logic gates?
(1) AND

(2) NAND

(3) NOR

(4) OR

As in question (i) A and B are the inputs applied to two inverters (NOT gates). Y1 and Y2 are their outputs which are applied to the input side of a two input NAND gate. The truth table for the combination is given below:

A     B     Y

0     0     0

0      1     1

1      0     1

1      1     1

The combination evidently implements OR operation. So the correct option is (4).