AFCAT EKT Computer Science Mock Test - 1 - Computer Science Engineering (CSE) MCQ

In order to schedule processes fairly, a round-robin scheduler generally employs time-sharing, giving each job a time slot or quantum (its allowance of CPU time), and interrupting the job if it is not completed by then. It is designed especially for time-sharing systems.

Full adder, full subtractor and half adder are combinational circuits.

JK flip flop and counter are sequential circuits.

Range of unsigned int is 0 to 65535 after this, its value becomes 0 again and this loop never ends.

Banker’s algorithm is a Deadlock avoidance algorithm, it doesn’t detect or prevent deadlock, it acquires prior knowledge of all the currently executing processes, so that it can help to avoid deadlock.

In circuit switching entire channel capacity is used for single communication.

Two types of switched services are used in Wide Area Network:

(1). Circuit Switching: In circuit switching, a dedicated channel, called circuit, is set up between two stations for the duration of the transmission.The circuit must be established to make a complete end-to-end  connection before any data transmission.The whole bandwidth is dedicated to to this connection even if no data is being transferred.

(2). Packet Switching: In packet switching there is no dedicated circuit between any two end nodes, links can be dynamically shared among several communications over time. To provide the link sharing, user data must be segmented into discrete, variable length units called packets.

Tesla (T) is a measure of magnetic flux density.

Electrical potential measures in volts (V).

When J=1 and K=1 then the race condition is occurs that means both output wants to be HIGH, it is called toggling.

A full adder can be realized by using two half adders and one OR gate.

A socket address is the combination of an IP address and a port number.

A network socket is an endpoint of a connection across a computer network.

The current at a point in the circuit is the amount of charge that passes that point in one second. A current of 1 A is flowing in a circuit if a charge of 1 coulomb passes any point in the circuit every second.

Long term scheduler is also called job scheduler. Long term scheduler determines which programs are admitted to the system for processing. Job scheduler selects processes from the process queue and loads them into memory for execution (new to ready state). The primary objective of the job scheduler is to provide a balanced mix of jobs, such as I/O bound and processor bound. It also controls the degree of multiprogramming. If the degree of multiprogramming is stable, then the average rate of process creation must be equal to the average departure rate of processes leaving the system.

As weak entity can be identified by using partial key + key of owner entity, the relationship set needs to be total participation.

RAM(Random access memory) is volatile while ROM(Read only memory), PROM(programmable read only memory) and EPROM(Erasable programmable read only memory) are non-volatile memories means their data will be retained even when the power is turned off.

Main task of Memory management module is to protect the space of one process from another.

Magnitude of resultant Forces F₁ and F₂ is:

F₁ and F₂ = P

When x is 45 degrees sinx + cosx attains maxima.

Twisted-pair wire has slowest transmission speed while fibre-optic cable has highest transmission speed.

We know that P(X U Y)= P(X) + P(Y) - P(X∩Y)
Given that both X and Y are independent hence P(X∩Y) =  P(X).P(Y)
So 0.8 = P(X)+ 0.5- 0.5 x P(X)
0.3 = 0.5P (X)
P (X) = 3/5 = 0.6 

Bridge works at data link layer, it transmits frames from one LAN to another.

+++ has 1 post increment operator and 1 sum operator, sum will be performed immediately.

Conservative two phase locking protocol requires a transaction to lock all the items it accesses before the transaction begins execution.

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

If transaction T1 fails, then the read of T2 will be a dirty read.

Optical fibre works on the principle of total internal reflection. Here light is used to transmit information from one place to another.

61 = 63-2, as 63 is represented by 111111, subtracting 2 will give 111101.

ASCII stands for American Standard Code for Information Interchange is a character encoding standard for electronic communication. ASCII characters are represented by seven bits. ASCII codes are of two types- ASCII-7 and ASCII-8. ​The standard ASCII character has 7 bits and the basic set ranges from 0 to 127.​ The extended ASCII character has 8 bits and the basic set ranges from 0 to 255.

The below truth table is for OR gate.

From the above truth table we can say that if one of the input is high, the output will be high.

The below truth table is for AND gate.

From the above truth table we can say that if one of the input is low, the output will be high.

Converting in decimal we have

Let the side of the square is x
Now, the area of square is, A = x²
Given that area of the square increased by 69%, the area will be 1.69 A
Let the increased side of the square is nx
⇒ (nx)² = 1.69x²
⇒ n = 1.3
Hence the side of the square increases by 30%

X->Y to be Trivial Y should be subset of X