AFCAT EKT Computer Science Mock Test - 3 - Computer Science Engineering (CSE) MCQ

It is usually written as wavelength = c / frequency.

A Hamiltonian path in a graph is a path that visits every vertex exactly once.

J-K flip-flop will act as D flip-flop if we have inverter between J and K inputs.

Range queries are faster in B+ trees.

⊕ represents exclusive or in which output is high when either of inputs is high but not both inputs are high.

Truth table of A⊕B
So, 1⊕1 = 0
(A = 1; B = 1)

By definition of the absolute value function:

If x >= 0, then |x| = x.
If x < 0, then |x| = -x.

Left-hand limit (L):
As x approaches 0 from the left, |x| = -x, so L = 0.

Right-hand limit (R):
As x approaches 0 from the right, |x| = x, so R = 0.

Since L = R = f(0) = 0, the function f(x) = |x| is continuous at x = 0.

Using the definition of differentiation:
f'(x) = limit as h approaches 0 of [(f(h) - f(0)) / h].

Left-hand derivative (L'):
As h approaches 0 from the left, f'(x) = (-h - 0) / h = -1.

Right-hand derivative (R'):
As h approaches 0 from the right, f'(x) = (h - 0) / h = 1.

Since L' is not equal to R', the derivative does not exist, and f(x) = |x| is not differentiable at x = 0.

It is domain constraint because a condition will be applied on the definition of domain in table schema.

Y is dominant entity and X is subordinate entity that means existence of X depends on existence of Y. In other words, deletion of Y will cause deletion of X.

By using n' = (ν / (ν - νs)) ⇒ 2n = n(ν / (ν - νs)) ⇒ νs = ν / 2

In class B, 172.16.0.0 to 172.32.0.0 are reserved as private IP address.

A: 1010
B: 1011
1: 0001
2: 0010
3: 0011

Values:
010 → 2
101 → 5
011 → 3
000 → 0
100 → 4
100 → 4
011 → 3

A page fault is a type of interrupt, called trap, raised by computer hardware when a running program accesses a memory page that is mapped into the virtual address space, but not actually loaded into main memory. The hardware that detects a page fault is the processor's memory management unit (MMU), while the exception handling software that handles page faults is generally a part of the operating system kernel. When handling a page fault, the operating system generally tries to make the required page accessible at the location in physical memory, or terminates the program in case of an illegal memory access.

Step 1: write 7 in binary i.e 0111

For 1’s complement:

Reverse all the bits i.e 0 to 1 and 1 to 0.

For 2’s complement:

Starting from unit’s digit, whenever the 1^st ‘1’ is encountered write it as it is and then take reverse of the remaining bits. So, 0111 = 1001

If λ_₁, λ_₂, λ_₃ are the Eigenvalues of A, then the Eigenvalues of Adj(A) are:
|A| / λ_₁, |A| / λ_₂, |A| / λ_₃
= 24/4, 24/3, 24/2
= 6, 8, 12

A array is an ordered list of a finite number of homogenous data elements stored in a continuous memory location. It is called ordered because the elements of the array are arranged so that there is a first, second, third and so on.

Homogenous because it contains single type of data.

Doppler’s effect is applicable to both light and sound waves. According to Doppler’s effect, whenever there is a relative motion between a source of sound and listener, the apparent frequency of sound heard by the listener is different from the actual frequency of sound emitted by the source.
Apparent frequency,
v = ((ν + u₀) / (ν - uₛ)) v₀

Examples of optical storage are :

CD-ROM, DVD-ROM, CD-R, CD-RW, photo CD.

Signed Magnitude: +0 = 0000 and -0 = 1000

One’s Complement: +0 = 0000 and -0 = 1111

Two’s Complement: +0 = 0000 and -0 = 0000

Well known ports are those from O through 1023. 80 is the well known port for http used in the world wide web.

It states that the magnitude of emf induced in the coil is equal to the rate of change of flux that linkages with the coil. The flux linkage of the coil is the product of number of turns in the coil and flux associated with the coil.
Magnetic flux: ϕ_B = B A cosθ where θ is angle between B and the normal to the plane.
Induced EMF: E = dϕ / dt

Isothermal process {u = f(T) only}

As temperature is constant in isothermal process so the internal energy also remains constant.

That’s why in an isothermal process the heat transfer is equal to the work transfer.

Syntax

expression-1 ? expression-2 : expression-3

x = i then x = cos(π/2) + i sin(π/2) = e^(iπ/2)

∴ x^x = iⁱ = (e^(iπ/2))ⁱ = e^(-π/2)

In computing, a nibble is a four - bit aggregation or half an octet. It is also known as half - byte. In a networking or telecommunication context, the nibble is often called a semi - octet,[6] quadbit.

For balancing the bridge:

P/Q = R/S'
S' = R × Q/P = 4 × 11/9 = 44/9

1/S' = 1/r + 1/6
1/r = 9/44
r = 132/5 = 26.4 Ω

In Gray code representation of binary code, consecutive numbers differs by exactly 1 bit.To get gray code from decimal number keep the MSB same ,to get consecutive numbers XOR it with higher significant bit

0        1               1              1

0 (0 XOR 1) (1 XOR 1) (1 XOR 1)

0        1                0              0

Bridge operates on data link layer of OSI model, that is in order to determine how to transmit traffic between LANs they use a destination MAC address unlike routers which use ip address(network address) in order to transmit packets.

DBMS facilitates the processes of defining, constructing, manipulating and sharing databases among various users and applications.

Defining a database

Specify data types, structures and constraints
Stored in the form of a database catalog

Meta-data: information stored inside a catalog

Constructing a database:Storing data on a storage medium

Manipulating a database:Querying a database to retrieve specific data

Update database to reflect
mini-world changes

Sharing a database:Multiple users and programs access
concurrently, Application programs access the database, send queries

Transaction :An atomic unit of queries and updates that must be executed as a whole

In IEEE 802.5, the token passing scheme is used in place of CSMA/CD on a ring topology LAN.

Token Ring local area network (LAN) technology is a communications protocol for local area networks. It uses a special three-byte frame called a "token" that travels around a logical "ring" of workstations or servers. This token passing is a channel access method providing fair access for all stations, and eliminating the collisions of contention-based access methods.