Explore topic-wise MCQs in Bachelor of Computer Applications (BCA).

This section includes 27 Mcqs, each offering curated multiple-choice questions to sharpen your Bachelor of Computer Applications (BCA) knowledge and support exam preparation. Choose a topic below to get started.

1.

If memory access takes 20 ns with cache and 110 ns without it, then the ratio (cache uses a 10 ns memory) is _____.

A. 93%
B. 90%
C. 88%
D. 87%
Answer» C. 88%
Discussion
2.

_________ register keeps track of the instructions stored in program stored in memory.

A. AR (Address Register)
B. XR (Index Register)
C. PC (Program Counter)
D. AC (Accumulator)
Answer» D. AC (Accumulator)
Discussion
3.

The average time required to reach a storage location in memory and obtain its contents is called the _____.

A. seek time
B. turnaround time
C. access time
D. transfer time
Answer» D. transfer time
Discussion
4.

What characteristic of RAM memory makes it not suitable for permanent storage?

A. too slow
B. unreliable
C. it is volatile
D. too bulky
Answer» D. too bulky
Discussion
5.

In signed-magnitude binary division, if the dividend is (11100)2 and divisor is (10011)2 then the result is ______.

A. (00100)2
B. (10100)2
C. (11001)2
D. (01100)2
Answer» C. (11001)2
Discussion
6.

Write Through technique is used in which memory for updating the data _____.

A. Virtual memory
B. Main memory
C. Auxiliary memory
D. Cache memory
Answer» E.
Discussion
7.

If the main memory is of 8K bytes and the cache memory is of 2K words. It uses associative mapping. Then each word of cache memory shall be_____.

A. 11 bits
B. 21 bits
C. 16 bits
D. 20 bits
Answer» D. 20 bits
Discussion
8.

Self-contained sequence of instructions that performs a given computational task is called

A. Function
B. Procedure
C. Subroutine
D. Routine
Answer» B. Procedure
Discussion
9.

The communication between the components in a microcomputer takes place via the address and

A. I/O bus
B. Data bus
C. Address bus
D. Control lines
Answer» C. Address bus
Discussion
10.

n bits in operation code imply that there are ___________ possible distinct operators.

A. 2n
B. 2n
C. n/2
D. n2
Answer» C. n/2
Discussion
11.

A device/circuit that goes through a predefined sequence of states upon the application of input pulses is called

A. register
B. flip-flop
C. transistor.
D. counter.
Answer» E.
Discussion
12.

If the value V(x) of the target operand is contained in the address field itself, the addressing mode is

A. immediate.
B. direct.
C. indirect.
D. implied.
Answer» C. indirect.
Discussion
13.

The maximum addressing capacity of a micro processor which uses 16 bit database & 32 bit address base is

A. 64 K.
B. 4 GB.
C. both (A) & (B) .
D. None of these.
Answer» C. both (A) & (B) .
Discussion
14.

A group of bits that tell the computer to perform a specific operation is known as____.

A. Instruction code
B. Micro-operation
C. Accumulator
D. Register
Answer» B. Micro-operation
Discussion
15.

The average time required to reach a storage location in memory and obtain its contents is called_____.

A. Latency time.
B. Access time.
C. Turnaround time.
D. Response time.
Answer» C. Turnaround time.
Discussion
16.

When CPU is executing a Program that is part of the Operating System, it is said to be in _____.

A. Interrupt mode
B. System mode
C. Half mode
D. Simplex mode
Answer» C. Half mode
Discussion
17.

An interface that provides I/O transfer of data directly to and form the memory unit and peripheral is termed as

A. DDA.
B. Serial interface.
C. BR.
D. DMA.
Answer» E.
Discussion
18.

The average time required to reach a storage location in memory and obtain its contents is called

A. Latency time.
B. Access time.
C. Turnaround time.
D. Response time.
Answer» C. Turnaround time.
Discussion
19.

A combinational logic circuit which sends data coming from a single source to two or more separate destinations is

A. Decoder.
B. Encoder.
C. Multiplexer.
D. Demultiplexer.
Answer» E.
Discussion
20.

The instructions which copy information from one location to another either in the processor s internal register set or in the external main memory are called

A. Data transfer instructions.
B. Program control instructions.
C. Input-output instructions.
D. Logical instructions.
Answer» B. Program control instructions.
Discussion
21.

The load instruction is mostly used to designate a transfer from memory to a processor register known as____.

A. Accumulator
B. Instruction Register
C. Program counter
D. Memory address Register
Answer» B. Instruction Register
Discussion
22.

_________ register keeps tracks of the instructions stored in program stored in memory.

A. AR (Address Register)
B. XR (Index Register)
C. PC (Program Counter)
D. AC (Accumulator)
Answer» D. AC (Accumulator)
Discussion
23.

A floating point number that has a O in the MSB of mantissa is said to have_____.

A. Overflow
B. Underflow
C. Important number
D. Undefined
Answer» C. Important number
Discussion
24.

The multiplicand register & multiplier register of a hardware circuit implementing booth's algorithm have (11101) & (1100). The result shall be ______.

A. (812)10
B. (-12)10
C. (12)10
D. (-812)10
Answer» B. (-12)10
Discussion
25.

An interface that provides a method for transferring binary information between internal storage and external devices is called

A. I/O interface
B. Input interface
C. Output interface
D. I/O bus
Answer» B. Input interface
Discussion
26.

Generally Dynamic RAM is used as main memory in a computer system as it______.

A. Consumes less power
B. has higher speed
C. has lower cell density
D. needs refreshing circuitry
Answer» C. has lower cell density
Discussion
27.

In Assembly language programming, minimum number of operands required for an instruction is/are

A. Zero.
B. One.
C. Two.
D. Both (B) & (C) .
Answer» B. One.
Discussion