WB JECA MCA 2024 Previous Year Questions (PYQs) – Page 3 of 8
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Showing 78 questions
In DMA transfers, the required signals and addresses are given by the ____.
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Solution
Solution: In Direct Memory Access (DMA), the DMA controller takes over bus control to put
addresses/control signals on the bus, freeing the CPU.
Answer: (C) DMA controllers
Answer: (C) DMA controllers
What is the output of following C code? int main(){ int x=2, y=1; x *= x + y; printf("%d", x); }
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Solution
Solution:
Answer: (D) 6
x *= x + y means x = x * (x + y) ⇒ 2 * (2 + 1) = 6.Answer: (D) 6
Which among the following can’t be used for polymorphism?
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Solution
Solution: Static member functions cannot be virtual; hence they don’t participate in runtime polymorphism.
Overloading (functions/operators/constructors) supports polymorphism.
Answer: (A) Static member functions
Answer: (A) Static member functions
If there are 32 segments each of size 1K bytes, then the logical address should have
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Solution
Solution: 32 segments ⇒ segment bits = $\log_2 32 = 5$. Size = 1 KB ⇒ offset bits = $\log_2 1024 = 10$.
Total address bits $= 5 + 10 = \boxed{15}$.
Answer: (D) 15 bits
Total address bits $= 5 + 10 = \boxed{15}$.
Answer: (D) 15 bits
In software engineering the tester does not know the internal designs of the software application in case of _____ testing.
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Solution
Solution: Black-box testing validates functionality without knowledge of internal code/design.
Answer: (B) Black Box
Answer: (B) Black Box
What is the output of the following code snippet? #include int main(){ int x; x = 5 > 8 ? 10 : 1 != 2 < 5 ? 20 : 30; printf("%d", x); return 0; }
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Solution
Solution:
Relational before != :
Answer: (D) 30
5>8 is false ⇒ evaluate 1 != 2 < 5 ? 20 : 30.Relational before != :
2<5 ⇒ 1. Then 1 != 1 ⇒ false ⇒ choose 30.Answer: (D) 30
_____ is a measure of the degree of interdependence between modules.
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Solution
Solution: Coupling measures interdependence between modules; cohesion measures internal relatedness within a module.
Answer: (B) Coupling
Answer: (B) Coupling
The permission -rwx r-- r-- represented in octal expression will be
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Solution
Solution: Owner rwx = 7, group r-- = 4, others r-- = 4 ⇒ 744.
Answer: (B) 744
Answer: (B) 744
What will be the output of the C code? #include int main(){ int a=1; if(a--) printf("True"); if(a++) printf("False"); }
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Solution
Solution: First
Second
Answer: (A) True
if(a--) uses 1 (true) then decrements to 0 ⇒ prints "True".Second
if(a++) tests 0 (false) then increments to 1 ⇒ no print.Answer: (A) True
Which command changes a file's group owner?
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Solution
Solution: The Unix command to change a file's group is
Answer: (D) chgrp
chgrp (change group).Answer: (D) chgrp
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