Full Test 1 - EKT CSE - AFCAT MCQ

Gravitational force,

Special theory of relativity treats problems involving inertial frame of reference. 

The force exerted by charged particle is given by:

For F to be maximum, 

Heat released by sun Q₁ = σAT₁⁴

As the temperature is doubled, T₂ = 2T₁

So Q₂ = σAT₂⁴ = σA(2T₁)⁴ = 16Q₁

A dynamo converts mechanical energy to electrical energy, whereas an motor converts electrical energy into mechanical energy.

By conservation of momentum

 for constant G and M

= +2%

∴ The value of g increases by 2%

Here, _aμ_w = 1.33

∴ Refractive index of air w.r. to water,

_wμ_a = 1/ _aμ_w = 1/1.33 = 0.7518

When child sits on the rotating disc, his weight acts downwards and does not produce any torque. Hence the angular momentum of the system is conserved.

The Tesla (symbolized T) is the standard unit of magnetic flux density.

In stack organized architecture push and pop instruction is needs a address field to specify the location of data for pushing into the stack and destination location during pop operation but for logic and arithmetic operation the instruction does not need any address field as it operates on the top two data available in the stack.

In IEEE-754 double precision number representation, number of exponent and mantissa bits respectively are 11 and 52, and 1 bit is used to represent sign.

Option (A) is TRUE. Short Term Scheduler is faster than Long Term Scheduler.

Option (B) is TRUE. Medium term scheduling is part of the swapping. It removes the processes from the memory. It reduces the degree of multiprogramming. The medium term scheduler is in-charge of handling the swapped out-processes.

Option (C) is FALSE. Long Term Scheduler controls the degree of Multiprogramming. Short Term Scheduler provides lesser control over degree of Multiprogramming. Medium Scheduler reduces the Degree of Multiprogramming.

Option D is TRUE. Long Term Scheduler selects processes from the pool and loads them into memory for execution.

80386 processor has 32-bit address capacity hence it is capable of accessing 2³² = 2² × 2³⁰ = 4 GB = 4096 MB of main memory.

The reflected binary code (RBC), also known as Gray code after Frank Gray, is a binary numeral system where two successive values differ in only one bit. The reflected binary code was originally designed to prevent spurious output from electromechanical switches. Today, Gray codes are widely used to facilitate error correction in digital communications such as digital terrestrial television and some cable TV systems.

Conversion from Gray Code to Binary Code:

Let Gray Code be G3  G2  G1  G0 and Binary Code be B3 B2 B1 B0. Then the respective Grey Code can be obtained as follows:

Now, convert 14 in grey code:

Binary code of 14 ® 1110

Hence the grey code is: 1001.

In an electrical power transformer, there are primary, secondary and may be tertiary windings. The performance of a transformer mainly depends upon the flux linkages between these windings. For efficient flux linking between these windings, one low reluctance magnetic path common to all windings should be provided in the transformer. This low reluctance magnetic path in transformer is known as core of transformer.

As it as an array of pointers to struct type.

OPT is not achievable, requiring perfect knowledge of future use.

BIOS (basic input/output system) is the program a personal computer's microprocessor uses to get the computer system started after we turn it on. It also manages data flow between the computer's operating system and attached devices such as the hard disk, video adapter, keyboard, mouse and printer.

If we set input value of de-multiplexer to 1, it works as a decoder.
Hence decoder is a special case of a de-multiplexer.

X.25 is a standard for WAN communications that defines how connections between user devices and network devices are established and maintained. X.25 is designed to operate effectively regardless of the type of systems connected to the network. It is typically used in the packet-switched networks (PSNs) of common carriers, such as the telephone companies. Subscribers are charged based on their use of the network.

Loopback address is a special IP number (127.0.0.1) that is designated for the software loopback interface of a machine. The loopback interface has no hardware associated with it, and it is not physically connected to a network.

Address bus is unidirectional out of microprocessor it carries address which maps to a particular memory location.

Metadata is the data providing information about the other data.

8086 has 20 bits of address lines 

4 bits = 1 nibble

thus 20 bits = 5 nibble

8086 microprocessor can address 2²⁰ memory locations or 1 MB of memory.

Shortest job first (SJF) can be implemented in pre-emptive or non- preemptive manner But SRTN is the preemptive version of SJF in which the scheduler always dispatches the ready process which was the shortest expected time to completion.

Note: SRTF(Shortest Remaining Time First) is same as SRTN.

Decipherment in cryptography refers to decryption which converts ciphertext (Secret or coded text) into plaintext (original text).

A worm is a self-replicating malicious software that does not alter files but duplicates itself. It is common for worms to be noticed only when their uncontrolled replication consumes system resources, slowing or halting other tasks.

To delete a column in a table, use the following syntax (notice that some database systems don't allow deleting a column):
ALTER TABLE table_name
DROP COLUMN column_name;

The size of network number bit field for class A is 8. It is 16 for class B; 24 for class C whereas it is not defined for class D and class E.