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UPSC Exam  >  UPSC Test  >  Electrical Engineering Optional Notes  >  Test: Counters - UPSC MCQ

Counters - Free MCQ Practice Test with solutions, UPSC Electrical Engineering


MCQ Practice Test & Solutions: Test: Counters (10 Questions)

You can prepare effectively for UPSC Electrical Engineering Optional Notes for UPSC with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Counters". These 10 questions have been designed by the experts with the latest curriculum of UPSC 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 10 minutes
  • - Number of Questions: 10

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Test: Counters - Question 1
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Consider the partial implementation of a 2-bit counter using T flip-flops following the sequence 0-2-3-1-0, as shown below 

To complete the circuit, the input X should be 

Detailed Solution: Question 1

From circuit we see 

T1=XQ1’+X’Q1—-(1) 

AND 

T2=(Q2 ? Q1)’—-(2) 

AND DESIRED OUTPUT IS 00->10->11->01->00 

SO X SHOULD BE Q1Q2’+Q1’Q2 SATISFYING 1 AND 2. 

SO ANS IS (D) PART. 

Test: Counters - Question 2
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The control signal functions of a 4-bit binary counter are given below (where X is “don’t care”)  The counter is connected as follows: 

Assume that the counter and gate delays are negligible. If the counter starts at 0, then it cycles through the following sequence: 

Detailed Solution: Question 2

Initially A1 A2 A3 A4 =0000 

Clr=A1 and A3 

So when A1 and A3 both are 1 it again goes to 0000 

Hence 0000(init.) -> 0001(A1 and A3=0)->0010 (A1 and A3=0) -> 0011(A1 and A3=0) -> 0100 (A1 and A3=1)[ clear condition satisfied] ->0000(init.) so it goes through 0->1->2->3->4 

Ans is (C) part. 

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Test: Counters - Question 3
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In digital logic, a counter is a device which ____________

Detailed Solution: Question 3

In digital logic and computing, a counter is a device which stores (and sometimes displays) the number of times a particular event or process has occurred, often in relationship to a clock signal.

Test: Counters - Question 4
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A counter circuit is usually constructed of ____________

Detailed Solution: Question 4

A counter circuit is usually constructed of a number of flip-flops connected in cascade. Preferably, JK Flip-flops are used to construct counters and registers.

Test: Counters - Question 5
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What is the maximum possible range of bit-count specifically in n-bit binary counter consisting of ‘n’ number of flip-flops?

Detailed Solution: Question 5

The maximum possible range of bit-count specifically in n-bit binary counter consisting of ‘n’ number of flip-flops is 0 to 2n-1. For say, there is a 2-bit counter, then it will count till 22-1 = 3. Thus, it will count from 0 to 3.

Test: Counters - Question 6
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How many types of the counter are there?

Detailed Solution: Question 6

Counters are of 3 types, namely, (i)asynchronous/synchronous, (ii)single and multi-mode & (iii)modulus counter. These further can be subdivided into Ring Counter, Johnson Counter, Cascade Counter, Up/Down Counter and such like.

Test: Counters - Question 7
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A decimal counter has ______ states.

Detailed Solution: Question 7

Decimal counter is also known as 10 stage counter. So, it has 10 states. It is also known as Decade Counter counting from 0 to 9.

Test: Counters - Question 8
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Ripple counters are also called ____________

Detailed Solution: Question 8

Ripple counters are also called asynchronous counter. In Asynchronous counters, only the first flip-flop is connected to an external clock while the rest of the flip-flops have their preceding flip-flop output as clock to them.

Test: Counters - Question 9
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Three decade counter would have ____________

Detailed Solution: Question 9

Three decade counter has 30 states and a BCD counter has 10 states. So, it would require 3 BCD counters. Thus, a three decade counter will count from 0 to 29.

Test: Counters - Question 10
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The parallel outputs of a counter circuit represent the _____________

Detailed Solution: Question 10

The parallel outputs of a counter circuit represent the clock count. A counter counts the number of times an event takes place in accordance to the clock pulse.

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About this UPSC Practice Test

This test contains 10 MCQs on Counters with detailed solutions for each question. It is part of the Electrical Engineering Optional Notes for UPSC course on EduRev, designed to align with the current UPSC syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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