The sample questions for the MCA Entrance Test conducted by Jawaharlal Nehru University required for preparation purpose are as follows:

1 The inverse of a diagonal matrix is
1. a symmetric matrix
2. a skew–symmetric matrix
3. a diagonal matrix
4. None of these

2 Which one of the following operations cannot be overloaded?
1. Subscripting operator
2. Function call operator
3. Membership operator
4. Assignment operator

3 A survey shows that 63% of Indians like banana whereas 76% like apples. If x% of Indians like both banana and apples,
then
1. x = 39
2. x = 63
3. 39 ≤ x ≤63
4. None of these

4 If f(x) = ax + b and g(x) = cx + d, then f(g(x)) = g(f(x)) is equivalent to
1. f(a) = g(c)
2. f(b) = g(b)
3. f(d) = g(b)
4. f(c) = g(a)

5 What is s system call?
1. Interface between process and hardware
2. Interface between OS and hardware
3. Interface between process and OS
4. None of these

6 Which of the following is correct?
1. 1 + i > 2 – i
2. 2 + i > 1 + i
3. 2 – i > 1 + i
4. None of these

7 The encoding scheme that uses only both polarities to represent binary 1 and 0 is
1. bi–phase
2. bipolar
3. polar

8 The resultant of three equal like parallel forces acting at the vertices of a triangle acts at its
1. incentre
2. cirucmcentre
3. circumcentre
4. centroid

9 If the complex numbers sin x + icos2x and cosx – isin 2x are conjugate to each other, then x is equal to
1. nπ
2. (n + ½)π
3. 0
4. None of these

10 The number of ways in which n distinct objects can be put into two different boxes so that no box remains empty is
1. 2n – 1
2. n2 – 1
3. 2n – 2
4. n2 – 2

11 Which of the following process models will be used to develop a software product for which critical requirements are
poorly understood?
1. Waterfall
2. Throw–away Prototyping
3. Evolutionary Prototyping
4. Incremental

12 The coefficient of x99 in the expansion of (x – 1) (x – 2)…(x – 100) is equal to
1. 5050
2. 5000
3. – 5050
4. – 5000

13 Consider a relation R(P, Q, R, S) with the set of functional dependences F = {PQ R, R S, S P}. Which of the
following is a key of R?
1. PQ
2. QR
3. QS
4. All of the above

14
If sets A and B are defined as
A = {(x, y): y = ex, x ∈ R}
B = {(x, y): y = x, x ∈ R}
then
1. B ⊂ A
2. A ⊂ B
3. A ∩ B = φ
4. A ∪ B = A

15 In LRU page replacement algorithm, the pages to be replaced are taken from
1. the past knowledge
2. the future knowledge
3. the present knowledge
4. depends on the page size of the processes

16 The number of solutions of the equation 5x + 5–x = log1025, (x
1. 0
2. 1
3. 2
4. infinitely many

17 What is the checksum code for a block of 5 messages defined by codes 48H, 65H, 6CH, 70H, and 21H?
1. 276H
2. 1AOH
3. AAH
4. A1H

18 A system multiplexes 10 channels of capacity 128 kbps each into a channel of 1024 kbps capacity using synchronous
Time Division Multiplexing. The number of channels, system will be able to multiplex if it uses asynchronous time
division multiplexing is
1. 18
2. 10
3. 15
4. 22

19 The number of times the digit 3 will be written when listing the integers from 1 to 1 is
1. 269
2. 300
3. 271
4. 302

20 On your way to work, you have to drive through a busy junction where you may be stopped at traffic lights. The cycle of
the traffic light is 2 minutes of green followed by 3 minutes of red. What is the expected delay in the journey, if you arrive
at the junction at random time uniformly distributed over the whole 5 minute cycle is??
1. 9/10 minute
2. 3/5 minute
3. 1/5 minute
4. 3/2 minutes