6 Discrete Mathematics (Computer Science) questions asked in BPSC TRE previous year papers, each with the correct answer and explanation. Read them free on UTpaper, or attempt the full papers as timed online tests.
What is the scope of the variable declared in the user-defined function?
AWhole program
BOnly inside the { } block
CInside the main function
DMore than one of the above
ENone of the above
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Correct answer: (B) Only inside the { } block
Explanation
A variable declared inside a function is local and visible only within that function's { } block.
Q2BPSC TRE 3.0 (2024) Computer Science Class 11-12
Which of the following is error detection code used in digital logic?
AHamming code
BCyclic redundancy check (CRC)
CChecksum
DMore than one of the above
ENone of the above
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Correct answer: (D) More than one of the above
Explanation
Hamming code, CRC and checksum are all codes for detecting errors (Hamming can also correct them), so more than one option is correct.
Q3BPSC TRE 3.0 (2024) Computer Science Class 11-12
What is the purpose of the “don’t care” condition in digital logic?
ATo indicate that the value of a variable does not affect the output
BTo prioritize certain inputs over others
CTo ensure that all possible input combinations are covered in truth tables
DMore than one of the above
ENone of the above
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Correct answer: (A) To indicate that the value of a variable does not affect the output
Explanation
A don't-care condition marks an input combination whose output value does not matter, so it can be taken as 0 or 1 to simplify a K-map.
Q4BPSC TRE 1.0 (2023) Computer Science Class 11-12
Which of the following is not a valid aggregate function?
ACOUNT
BCOMPUTE
CSUM
DMore than one of the above
ENone of the above
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Correct answer: (B) COMPUTE
Explanation
COUNT, SUM, AVG, MIN and MAX are aggregate functions. COMPUTE is not a standard SQL aggregate function.
Q5BPSC TRE 1.0 (2023) Computer Science Class 11-12
The matrix contains m rows and n columns. The matrix is called Sparse Matrix if
Atotal number of zero elements > (m × n)/2
Btotal number of zero elements = m + n
Ctotal number of zero elements = m / n
DMore than one of the above
ENone of the above
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Correct answer: (A) total number of zero elements > (m × n)/2
Explanation
A matrix is sparse when most of its elements are zero, meaning more than half of the m × n elements.
Q6BPSC TRE 2.0 (2023) Computer Science Class 11-12
The _____ measures the number of lost or garbled messages as a fraction of the total sent in the sampling period.
Aresidual error rate
Btransfer failure probability
Cconnection release failure probability
DMore than one of the above
ENone of the above
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Correct answer: (A) residual error rate
Explanation
Residual error rate is the transport-layer QoS parameter for the fraction of messages lost or garbled out of all messages sent in the sampling period.
How to use these BPSC TRE Computer Science questions
Every question here was asked in a real BPSC TRE 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 BPSC TRE papers as timed tests to check your speed under exam conditions.