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RRB JE ECE (CBT II) Mock Test- 7 - Electronics and Communication Engineering (ECE) MCQ


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30 Questions MCQ Test RRB JE Mock Test Series for ECE 2025 - RRB JE ECE (CBT II) Mock Test- 7

RRB JE ECE (CBT II) Mock Test- 7 for Electronics and Communication Engineering (ECE) 2024 is part of RRB JE Mock Test Series for ECE 2025 preparation. The RRB JE ECE (CBT II) Mock Test- 7 questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The RRB JE ECE (CBT II) Mock Test- 7 MCQs are made for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for RRB JE ECE (CBT II) Mock Test- 7 below.
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RRB JE ECE (CBT II) Mock Test- 7 - Question 1

Which of the following characteristic is related to effectiveness of data communication system?

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 1

The effective of a data communications system depends on four fundamental characteristics:

delivery, accuracy. timeliness, and jitter.

  • Delivery: The system must deliver data to the correct destination; Data must be received by the intended device or user
  • Accuracy: The system must deliver the data accurately; Data that have been altered in transmission and left uncorrected are unusable
  • Timeliness: The system must deliver data in a timely manner; Data delivered late are useless
  • Jitter: Jitter refers to the variation in the packet arrival time; It is the uneven delay in the delivery of audio or video packets

RRB JE ECE (CBT II) Mock Test- 7 - Question 2

The strength of an electromagnet can be increased by introducing a soft iron core

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 2

The strength of an electromagnet can be increased by introducing a soft iron core inside the coil. We can make the electromagnet stronger by adding more turns to the coil.

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RRB JE ECE (CBT II) Mock Test- 7 - Question 3

Where will the deleted files be stored?

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 3

In computing, the Trash (also known as the Recycle Bin in Windows) is the temporary storage for files that have been deleted in a file manager by the user, but not yet permanently erased from the file system.

Typically, a recycle bin is presented as a special file directory to the user, allowing the user to browse deleted files, undelete those that were deleted by mistake, or delete them permanently (either one by one, or by the "Empty Trash" function).

RRB JE ECE (CBT II) Mock Test- 7 - Question 4

Which of the following statement is correct?

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 4

In Diamagnetic materials, a very weak form of magnetism that is non-permanent exists only while the external field is being applied

The relative permeability is small and less than unity

In paramagnetic materials, each atom possesses a permanent dipole moment by virtue of incomplete cancellation of electron spin and orbital magnetic moments

At the macroscopic level, these magnetic moments cancel out each other and there is no net magnetism in the absence of an electric field

RRB JE ECE (CBT II) Mock Test- 7 - Question 5

If the roots of the equation (x + 5) (x + 7) - 8 = 0 are a and b. Then the roots of the equation(x + a) (x + b) + 5 = 0 are?

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 5

as we know
αx² + βx + γ = 0
if C and D are roots of the above equation
C'D = γ/α
C + D = (-β/α)
Same can be applied for
(x + 5) (x + 7) - 8 = 0
x² + 12x + 27 = 0
the roots of above equation are a and b
ab = 27
a + b = -12
(x + a) (x + b) + 5 = 0
x² + x(a + b) + ab + 5 = 0
x² - 12x + 32 = 0
(x - 4) (x - 8) = 0
hence roots are 8 and 4

RRB JE ECE (CBT II) Mock Test- 7 - Question 6

Which of the following states of India is the folk dance Oyilattam associated with?

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 6

Oyilattam folk dance belongs to Madurai region of Tamil Nadu.

This dance is mainly performed at village festivals.

This dance highlights the epics of Ramayana and Mahabaratha.

RRB JE ECE (CBT II) Mock Test- 7 - Question 7

Which one of the following is NOT true for 8086?

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 7

Size:

8085 is 8-bit microprocessor

8086 is 16-bit microprocessor

Address Bus:

8085 has 16-bit address bus

8086 has 20-bit address bus

Memory:

8085 can access up to 64Kb

8086 can access up to 1 Mb of memory

Instruction:

8085 doesn’t have an instruction queue

8086 has an instruction queue

Pipelining:

8085 doesn’t support a pipelined architecture

8086 supports a pipelined architecture

I/O:

8085 can address 28 = 256 I/O's

8086 can access 216 = 65,536 I/O's.

RRB JE ECE (CBT II) Mock Test- 7 - Question 8

Satya Shodhak Samaj organized

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 8
  • Satyashodhak Samaj was a social reform society founded by Jyotirao Phule in Pune in 1873. Its purpose was to liberate the less privileged in society from exploitation and oppression.
  • A Pune-based newspaper, Deenbandhu, provided the voice for the views of the Samaj.

Hence, the correct option is (C)

RRB JE ECE (CBT II) Mock Test- 7 - Question 9

Which of the following companies has launched the educational app ‘JEE Ready’?

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 9

Global e-commerce giant ‘Amazon’ has entered, into the ed tech space with the launch of its first ed tech app in India called ‘JEE Ready’ for IIT JEE.
Hence, the correct option is (B)

RRB JE ECE (CBT II) Mock Test- 7 - Question 10

Which one of the following Articles provides reservation of seats for the Scheduled Castes and Scheduled Tribes in the Panchayats ?

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 10

There is a provision for reservations in Scheduled Caste and Scheduled Tribe panchayats under Article 243 (D).
Hence, the correct option is (A)

RRB JE ECE (CBT II) Mock Test- 7 - Question 11

Which are the output function in C?

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 11

Input function in C: scanf(), getchar() and fscanf()
Output functionin C: printf(), putchar() and fprintf()
Hence, the correct option is (C)

RRB JE ECE (CBT II) Mock Test- 7 - Question 12

The minimum number of gates required to implement
X = AB + ABC + AB̅C̅ + AC̅
(Assume complement are not available and all gates are available)

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 12

X = AB + ABC + AB̅C̅ + AC̅
X = AB (1 + C) + AC̅ + (B̅ + 1)
X = AB + AC̅
X = A(B + C̅)

Hence no. of gates required 3.
1 and
1 OR
1 NOT
Hence, the correct option is (C)

RRB JE ECE (CBT II) Mock Test- 7 - Question 13

Piezo-electric transducers are

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 13

Inverse transducer is defined as a device which converts an electrical quantity into a non-electrical quantity.

A piezoelectric crystal acts as inverse transducer because when a voltage is applied across its surfaces, it changes its dimensions causing a mechanical displacement.
Hence, the correct option is (B)

RRB JE ECE (CBT II) Mock Test- 7 - Question 14

The transducers which requires an external power and their output is a measure of some variation such as resistance, inductance, capacitance etc., are called as

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 14

Active transducers are those which do not require any power source for their operation. They produce an electrical signal proportional to the input.

Passive transducers require an external power and their output is a measure of some variation such as resistance, inductance, capacitance etc.
Hence, the correct option is (C)

RRB JE ECE (CBT II) Mock Test- 7 - Question 15

Electron beam in oscilloscope is deflected in __________

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 15
  • The electron beam in an oscilloscope can be deflected in two directions.
  • One is horizontal (x-direction) and the second vertical (y-direction).
  • When two inputs are applied at horizontal and vertical plates, two dimensional displays are produced as a result.

Hence, the correct option is (D)

RRB JE ECE (CBT II) Mock Test- 7 - Question 16
Which of the following materials when used as the viewing surface of a CRO gives a reddish glow?
Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 16

The actual conversion of electrical to light energy takes place on the display screen when electrons strike a material known as a phosphor.

A phosphor is a chemical that glows when exposed to electrical energy. A commonly used phosphor is the compound zinc sulfide.

When pure zinc sulfide is struck by an electron beam, it gives off a greenish glow. The exact colour given off by a phosphor also depends on the presence of small amounts of impurities. For example, zinc sulfide with silver metal as an impurity gives off a bluish glow and with copper metal as an impurity, a greenish glow.

The phosphor known as yttrium oxide gives off a red glow when struck by electrons, and yttrium silicate gives off a purplish-blue glow.

RRB JE ECE (CBT II) Mock Test- 7 - Question 17
The ideal OP-AMP has the following characteristic
Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 17

Ideal Op-amp has the following specifications i.e.

  • Rin = ∞
  • Rout = 0 Ω
  • Gain A = ∞
  • Slew rate = ∞
  • CMRR = ∞
  • Band width = ∞

RRB JE ECE (CBT II) Mock Test- 7 - Question 18
Erlangs is the unit of
Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 18

  • Traffic intensity is a measure of the average occupancy of a server or resource during a specified period, normally a busy hour
  • It is measured in traffic units (erlangs) and defined as the ratio of the time during which a facility is cumulatively occupied to the time this facility is available for occupancy

RRB JE ECE (CBT II) Mock Test- 7 - Question 19
A microcontroller is a single chip _______
Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 19

An 8051 microcontroller is a mini computer in itself. It performs all the action of a computer on small scale. It has a CPU, memory (ROM/RAM) and I/O ports.

RRB JE ECE (CBT II) Mock Test- 7 - Question 20
The Michelangelo Virus is:
Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 20

  • A computer virus is a type of malicious software that, when executed, replicates itself by modifying other computer programs and inserting its own code
  • When this replication succeeds, the affected areas are then said to be "infected" with a computer virus
  • Michelangelo is the best-known computer virus 
  • It is a boot sector virus; The only way you can get it is to boot your PC with an infected floppy disk

RRB JE ECE (CBT II) Mock Test- 7 - Question 21
In digital transmission, the modulation technique that requires the minimum bandwidth is:
Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 21

  • In PCM an analogue signal is sampled and encoded into different levels before transmission
  • The bandwidth of PCM depends on the number of levels
  • If each sample is encoded into n bits, then the bandwidth of PCM is nfs
  • The bandwidth of DPCM is same as that of PCM signal, the only difference between PCM and DPCM is that the dynamic range is reduced in the DPCM signal
  • However, in the case of Delta modulation, each sample is sent using only 1 bit which is +Δ or -Δ
  • Hence there is bandwidth saving in Delta modulation

RRB JE ECE (CBT II) Mock Test- 7 - Question 22
Who won the Europa League final?
Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 22

  • Chelsea got the better of its English Premier League rivals to win the Europa League final Wednesday, beating Arsenal 4-1 in the Baku Olympic Stadium.
  • Chelsea won their fifth major Uefa European competition final, with only Liverpool winning more among eight English clubs.

RRB JE ECE (CBT II) Mock Test- 7 - Question 23
Which of the following digital personal assistant used in Windows 10?
Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 23

Digital personal assistant:

  • A digital personal assistant is a software-based service that resides in the cloud, designed to help end users complete tasks online
  • In 2015 Microsoft released Windows 10, which came with Cortana, a digital personal assistant like Apple’s Siri
  • Alexa is a personal assistant developed by Amazon released in Nov 2017
  • The Google Assistant is personal assistant developed by Google that is primarily available on mobile and smart home devices; It was first debuted in May 2016

RRB JE ECE (CBT II) Mock Test- 7 - Question 24

State number of flip flops required to construct mod -64 counter. Find largest decimal number that can be stored in mod-64 counter.

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 24

To construct mod-m counter the number of flip flops required are given by:
n ≥ log2m
Thus, for mod 64 counter, number of flip flops required are:
n ≥ log264
n = 6
mod- n means counter counts n states which are from 0 to n-1
Thus mod 64 counter counts from: 0 to 63
Largest decimal number: 63

RRB JE ECE (CBT II) Mock Test- 7 - Question 25

Article 43 of the Indian Constitution deals with the ________.

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 25

RRB JE ECE (CBT II) Mock Test- 7 - Question 26

The value of voltage source required, so that current through the 60Ω Resistor is 2A is _________ Volts.

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 26

Apply KCL at node A
10 = 2 + i
i = 8 A

Apply KVL
+60 (2) – 8 (10) – V = 0
120 – 80 = V
V = 40 V

RRB JE ECE (CBT II) Mock Test- 7 - Question 27
Secondary cells _______
Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 27

A cell consists of a pair of metal strips called electrodes and dipped in a chemical solution called electrolyte.

Primary cells:

Primary cells are those which once fully used has to be thrown out or destroyed. This is because the electrodes and electrolyte used in this type of cells cannot be reused. Hence, primary cells are non-rechargeable cells.

Generally, the electrolyte used in primary cells is of paste form. Hence, these are called as dry cells. These are light in weight and have less cost.

Secondary cells:

Secondary cells are those which once used can be reused by charging them. Hence, secondary cells are rechargeable cells.

Generally, the electrolyte used in secondary cells is in liquid form. Hence, these are called as wet cells. These are heavy in weight and have a high initial cost.

RRB JE ECE (CBT II) Mock Test- 7 - Question 28

Where is the Headquarter of UNCTAD (United Nations Conference on trade and development)?

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 28

  • UNCTAD is the principal organ of the UN General Assembly dealing with trade, investment, and development issues.
  • The organization's goals are to  "maximize the trade, investment and development opportunities of developing countries and assist them in their efforts to integrate into the world economy on an equitable basis”.
  • The headquarters of the United Nations Conference on Trade and Development is located in the Palace of Nations (United Nations Office at Geneva, Switzerland).

RRB JE ECE (CBT II) Mock Test- 7 - Question 29

What is the 2’s complement of -21?

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 29

Step 1:

Find the binary representation of 21

Read the binary number form base:

21 in 2’s complement: 0001 0101

Step 2:

Find 1’s complement of 0001 0101

1’s complement of 0001 0101 is 1110 1010

Step 3:

Add 1 to find 2’s complement of the -21

1110 1010 + 1 = 1110 1011

∴ 2’s complement of -21 is 1110 1011

RRB JE ECE (CBT II) Mock Test- 7 - Question 30

A scheme in which several channels are interleaved and then transmitted together is known as

Detailed Solution for RRB JE ECE (CBT II) Mock Test- 7 - Question 30

A scheme in which several channels are interleaved and then transmitted together is known as Frequency division multiplexing.

In Frequency division multiplexing signals occupy a range of frequency and two adjacent signals are separated by guard band to prevent mixing.

All the multiplexed signals are then transmitted simultaneously

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