Full Test 4 - EKT CSE - AFCAT MCQ

A working diode means the diode is biased or connected with the DC source. When a diode is forward biased (+ve terminal to anode and -ve terminal to cathode), it provides a low resistance path because it helps the majority carrier to crossover the barrier potential and conduct the flow of current. When a diode is reversed biased (-ve terminal to anode and +ve terminal to cathode) it provide a high resistance path because the majority carriers are flows away from the junction and no current conduction takes place.

10 flip flop will count from 0 to 1023. Hence 11 flip flops are required to count from 0 to 1024.

If G₀G₁G₂G₃ is a gray code number then the BCD equivalent number B₀B₁B₂B₃ can be estimated using:
B₃ = G₃
B₂ = B₃ ⊕ G₂
B₁ = B₂ ⊕ G₁
B₀ = B₁ ⊕ G₀
So, using the above rules, the BCD equivalent of gray code number 1001 is 1110

Packet-switched describes the type of network in which relatively small units of data called packets are routed through a network based on the destination address contained within each packet. Breaking communication down into packets allows the same data path to be shared among many users in the network.

While in Circuit switching a dedicated communications channel (circuit) between communicating nodes is established through the network before the nodes may communicate. The circuit guarantees the full bandwidth of the channel and remains connected for the duration of the communication session. The circuit functions as if the nodes were physically connected as with an electrical circuit.

CRC stands for cyclic redundancy check it is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to raw data.

DLL is responsible for creating and recognizing frame boundaries

1) 2’s complement number of 11100111 = 0011001 = (−25)₁₀

2) 2’s complement number of 11100100 = 0011100 = (−28)₁₀

3) 2’s complement number of 11010111 = 0101001 = (−41)₁₀

4) 2’s complement number of 11011011 = 0100101 =(−37)₁₀

Divider,
2’s complement number of 11111011 = 0000101 = (−5)₁₀

Since -25 is divisible by -5, thus the number 11100111 is divisible by 11111011.

The given matrix is

The determinant is given as |A| = λ³ – 1 
If ⍴(A) is given as 2, then the determinant of A should be zero
⇒ |A| = 0 ⇒ λ³ – 1 = 0;
We get λ = 1  at which there are more than one 22 sub-matrices having non zero determinant
∴ value of λ is 1 for which rank of A is 2

Ethernet→data link layer
Internet Protocol→ network layer
Hyper text protocol→application layer

In 8085, there are eight pins dedicated to transmit the most significant 8 bits of the memory address. The 8085 has a 16 bit address transmission capability.

The half adder adds two single binary digits A and B. It has two outputs, sum (S) and carry (C). The carry signal represents an overflow into the next digit of a multi-digit addition. A half adder circuit is basically made up of an a AND gate with XOR gate.

Sum (S) = A⊕B
Carry (C) = AB

Given three symbols with probability of 0.25, 0.25 and 0.50 at the rate of 3000 symbols per second.

= 1.5
Rate of information = r.H
= 1.5× 3000
= 4500 bits/sec

In binary multiplication, we only need to remember the following rules:
0 x 0 = 0
0 x 1 = 0
1 x 0 = 0
1 x 1 = 1
So, by using above rules when we will multiply binary 1000 with binary 1111 we will get binary 11110000 as the product.

The determinant if matrix A is given as

Dimension of magnetic flux density is MT^-2I^-1

Kinetic energy represents energy the mass possesses by virtue of its motion. Likewise, potential energy (PE = mgh) represents energy the mass possesses by virtue of its position.

E = KE + PE

E is the total energy of the mass: i.e., the sum of its kinetic and potential energies. It is clear that E is a conserved quantity: i.e., although the kinetic and potential energies of the mass vary as it falls, its total energy remains the same and one form of energy is being converted into other form of energy.

(10001101011001)₂ = (0010 − 0011 − 0101 − 1001)₂ = (2359)H
Hexadecimal equivalent of binary number 10001101011001 is 2359

CMOS uses field effect transistors. It is a technology for constructing integrated circuits. CMOS technology is used in microprocessors, microcontrollers, static RAM, and other digital logic circuits.

When a positive voltage is applied to the N-type material and a negative voltage is applied to the P-type material, then a diode is connected in a reverse bias condition. In reserve bias the holes and electrons are attracted to the battery terminal and depletion region increased.

Conditional probability P(A|B):

For x = 3, (x² – 8) > 0 so |x² - 8| = x² – 8
f(x) = x + (x² – 8)
f’(x) = 1 + 2x
f’(3) = 1 + 2(3) = 7

Referential Integrity Constraint.
When a foreign key value is used it must reference a valid, existing primary key in the parent table. For instance, deleting a record that contains a value referred to by a foreign key in another table would break referential integrity.

Angle between two vectors:

θ = 60°

As there is cardinality mentioned as (1,6) in Employee side, so this implies that, Each employee is assigned at least one, but no more than 6 phones.

Similarly the cardinality (1,10) implies that, each phone is assigned to at least one, and may be assigned up to 10 employees.

There exists partial dependency : A → B
Hence it’s not in 2 NF

The initial phase of database design is to characterize fully the data needs of the prospective database user.The outcome of this phase is a specification of user requirements. Next, the designer chooses a data model and by applying the concepts of the chosen data model, translates these requirements into a conceptual schema of the database. The E-R model, is typically used to represent the conceptual design.

(i) Correct: A normalized database has fewer repeated values – redundancy is replaced with foreign-key references to the redundant data.

(ii) Incorrect:  Schema normalization tends to increase the number of joins required, as it creates new tables.

(iii) Correct: This is the main purpose of schema normalization.

Strict 2 PL is not dead lock – free