________ begins at the vortex of the spiral and concentrate on each component of the software as implemented in source code.
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Correct answer: (C) Unit testing
BEL PE · Topic-wise previous year questions
Computer Science Previous Year Questions
100 Computer Science questions asked in BEL PE previous year papers, each with the correct answer and explanation. Read them free on UTpaper, or attempt the full papers as timed online tests.
- 100 questions
- 6 topics
- Official answer key
- Free
Practise by topic
In context of Relational Algebra of Database Management System, SELECT operation is used to select a subset of the tuples from a relation that satisfy a __________.
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Correct answer: (B) Selection Criteria
Choose the CORRECT sequence of steps involved in machine learning cycle.
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Correct answer: (B) Data identification → Data preparation → Selection of machine learning algorithm → Train model → Evaluate the model → Deploy the model
Which of the following pair of Application layer protocol of OSI model and its services is CORRECT?
I. X.400 – Directory
II. X.500 – Electronic Mail protocol
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Correct answer: (D) Neither I nor II
Given an array X = (22, 33, 55, 88, 96) and key = 88
How many iterations are required to find the key using binary search?
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Correct answer: (D) 2
What is the approximate value of 149.832 ÷ 25.0138 + 7.10 × 2.008?
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Correct answer: (A) 20
Match the language with its machine format.
Language: I. Unrestricted language; II. Context sensitive language; III. Context free language; IV. Regular expression
Machine: 1. Finite automata; 2. Push down automata; 3. Linear bounded automata; 4. Turing machine
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Correct answer: (D) I – 4; II – 3; III – 2; IV – 1
Which of the following is the mostly used activation function in the area of deep learning?
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Correct answer: (D) Rectified linear unit function
Name the phase of the unified process model where customer communication and planning take place.
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Correct answer: (A) Inception phase
Which of the following is NOT a process state?
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Correct answer: (A) Start
What is the value of (21/46) ÷ (1/6) of (23/42) + (96/576) × (24/3) − ((88/56) × (7/9) ÷ (5/36))?
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Correct answer: (A) 9/2
Three unbiased dices are thrown, what is the probability of getting a sum of at least 11?
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Correct answer: (D) 11/36
Mixture of milk and water in three bottles of equal capacity is in the ratio 3 : 4, 1 : 2 and 9 : 5 respectively. These three bottles are emptied into a large bottle. What will be the ratio of milk and water respectively in the large bottle?
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Correct answer: (A) 59 : 67
Which view of the quality argues that quality is something you immediately recognize but cannot explicitly define according to David Galvin of the Harvard Business school?
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Correct answer: (A) Transcendental view
Which of the following formula is used to calculate the sensitivity of a model?
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Correct answer: (D) TP / (TP + FN)
Which of the following machine learning algorithm does NOT use clustering?
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Correct answer: (A) Linear Discriminant Analysis
Which of the following array representation is CORRECT for the max heap of the following data elements?
20, 30, 70, 10, 5, 50, 80
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Correct answer: (A) 80, 20, 70, 10, 5, 30, 50
Which of the following is NOT the action performed by a shift – reduce parser?
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Correct answer: (B) Debase
Which of the given option is CORRECT?
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Correct answer: (C) (17/27) < (15/22) < (13/17)
Which of the following is the single path shortest path algorithm?
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Correct answer: (D) Dijkstra's algorithm
In context of Database, which of the following is the CORRECT order for creating a database?
A → Defining its structure (scheme)
B → Entering data into the database
C → Designing forms (custom screens) for displaying and entering data
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Correct answer: (B) A → C → B
Parser is categorized into which type of context-free grammar?
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Correct answer: (A) Two
Consider the following queue of character, implemented using array of 7 memory,
Front = 3 Rear = 4 Queue: –, –, A, B, __, __, __, where '–' denotes empty memory cell. What is the value of front and rear after the following operation?
Enqueue C, D
Dequeue
Enqueue E, F
Dequeue
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Correct answer: (A) Front = 5 Rear = 1
10 + (1010)* [∧ + (1010)*] is equivalent to ______, where ∧ represents null.
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Correct answer: (A) 10 + (1010)*
In the push down automata, transitional function δ is in the form ______.
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Correct answer: (D) Q × (Σ ∪ {λ}) × Γ → (Q, Γ*)
Convert (1111)₂ into decimal equivalents.
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Correct answer: (D) 15
In any computer network, a communication protocol normally perform, which of the following functions for efficient and error free transmission of data?
I. Data Routing
II. Procedure and order of Transmission
III. Data security
IV. Data formatting
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Correct answer: (D) I, II, III and IV
Which of the following statement is CORRECT?
I. An input device is an electromechanical device that accepts data from the outside world and translates it into a form a computer can interpret.
II. An output device is an electromechanical device that accepts data from a computer and translates them into a form suitable for use by outside world.
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Correct answer: (B) Both I and II
Which of the following change brought about by the iterative waterfall model to the classical waterfall model?
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Correct answer: (D) Addition of feedback paths
Which derivation is also known as canonical derivations?
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Correct answer: (D) Right most derivation
Sort the following list using radix sort:
429, 557, 757, 939, 536, 820, 455
What is the output of the algorithm after the first pass?
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Correct answer: (B) 820, 455, 536, 557, 757, 429, 939
Match the following network diagram with the correct topology.
Network diagram: I. Four computers, each connected directly to one central host; II. Computers connected to one another in a closed loop; III. Computers attached to a single communication line.
Topology: 1. Ring network; 2. Bus network; 3. Star network
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Correct answer: (C) I – 3; II – 1; III – 2
What is the decimal conversion of (630.4)₈?
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Correct answer: (D) 408.5
Full-Subtractor has ______ inputs and ______ outputs.
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Correct answer: (D) 3; 2
K-Nearest Neighbours algorithm is a ________ classification algorithm that classifies new data point based on the nearest data point.
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Correct answer: (C) Supervised
Which of the following is NOT the part of the organization of C programming language Activation Record?
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Correct answer: (D) Formal parameters
The following C function is an example of what type of recursion?
int f(int n)
{
if(n==1)
return 1;
else if(n==0)
return 0;
else
return(f(n-1)+f(n-2));
}
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Correct answer: (B) Binary
Which of the following statement is CORRECT about software testing?
I. White box testing is performed early in the testing phase.
II. Black box testing tends to be applied during later stages of testing.
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Correct answer: (B) Both I and II
Which of the following identities of regular expression is NOT correct?
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Correct answer: (D) φR = R
Match the component of software architecture with its roles.
Component: I. Control component; II. Problem domain component; III. Infrastructure component
Role: 1. That implements a complete or partial function i.e. required by the customer; 2. Responsible for function that support the processing required in the problem domain; 3. Co-ordinate the invocation of all other problem domain components
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Correct answer: (C) I – 3; II – 1; III – 2
A process is ________, if it cannot affect or be affected by the other processes executing in the system.
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Correct answer: (A) independent
How many steps are required to construct a string abbbb from the grammar given by using right most derivation?
S → aAB
A → bBb
B → A | ε
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Correct answer: (A) 5
Consider a hash table with 10 slots. What is the sequence of the following elements in a hash table if hash function is k mod 10 and the collision is resolved using linear probing?
44, 26, 12, 93, 80, 57, 56, 23, 46, 36
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Correct answer: (D) 80, 36, 12, 93, 44, 23, 26, 57, 56, 46
How many distinct binary trees are constructed using 5 nodes?
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Correct answer: (A) 42
Which of the following statement is CORRECT regarding FLIP-FLOPS?
I. A FLIP-FLOP circuit can maintain a binary state indefinitely (as long as power is applied) until directed by an input signal to switch states.
II. The major differences among various types of FLIP-FLOPS are in the number of inputs they possess and in the manner in which the inputs affect the binary state.
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Correct answer: (A) Both I and II
Identify the category of the multithreading which allow a program to continue running even if part of it is blocked or is performing a lengthy operation.
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Correct answer: (A) Responsiveness
Which of the following is the type of parallel processor system as per Flynn's taxonomy?
I. Single instruction, single data (SISD) stream
II. Single instruction, multiple data (SIMD) stream
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Correct answer: (D) Both I and II
In First-Come-First-Served CPU scheduling algorithm when all the other processes wait for one big process to get off the CPU is known as ________.
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Correct answer: (C) Convoy effect
In context of computer networks, based on data transmission speed which of the following are the bases categories of communication channels (paths)?
I. Narrow band
II. Voice band
III. Broad band
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Correct answer: (D) I, II and III
Consider 2 dimensional array A[10][15]. Assume that each element takes one memory location and base address of array A is 100. Consider the lower bound of row and column as 0. What is the address of A[i][j] if array A is stored in row major form?
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Correct answer: (C) 15i + j + 100
How to use these BEL PE Computer Science questions
Every question here was asked in a real BEL PE paper; the paper and shift are shown on the card, and the number opens the question on its own page. Try each one before tapping Show answer, then attempt the full BEL PE papers as timed tests to check your speed under exam conditions.