ISRO Computer Science (CSE) 2017 Question Paper & Solutions

Attempt the ISRO Computer Science (CSE) 2017 previous year paper in real CBT exam mode or practice mode with the official answer key. Step-by-step explanations are coming soon.

All ISRO Computer Science (CSE) papers

80 questions.

Question 1

ISRO Scientist/Engineer CS 2017, Question 1: see the question image.

Figure for question 1, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: C. Option C

Question 2

ISRO Scientist/Engineer CS 2017, Question 2: see the question image.

Figure for question 2, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: B. Option B

Question 3

ISRO Scientist/Engineer CS 2017, Question 3: see the question image.

Figure for question 3, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: A. Option A

Question 4

ISRO Scientist/Engineer CS 2017, Question 4: see the question image.

Figure for question 4, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: B. Option B

Question 5

ISRO Scientist/Engineer CS 2017, Question 5: see the question image.

Figure for question 5, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: A. Option A

Question 6

ISRO Scientist/Engineer CS 2017, Question 6: see the question image.

Figure for question 6, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: C. Option C

Question 7

ISRO Scientist/Engineer CS 2017, Question 7: see the question image.

Figure for question 7, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: A. Option A

Question 8

ISRO Scientist/Engineer CS 2017, Question 8: see the question image.

Figure for question 8, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: D. Option D

Question 9

ISRO Scientist/Engineer CS 2017, Question 9: see the question image.

Figure for question 9, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: B. Option B

Question 10

ISRO Scientist/Engineer CS 2017, Question 10: see the question image.

Figure for question 10, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: D. Option D

Question 11

ISRO Scientist/Engineer CS 2017, Question 11: see the question image.

Figure for question 11, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: D. Option D

Question 12

ISRO Scientist/Engineer CS 2017, Question 12: see the question image.

Figure for question 12, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: D. Option D

Question 13

ISRO Scientist/Engineer CS 2017, Question 13: see the question image.

Figure for question 13, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: A. Option A

Question 14

ISRO Scientist/Engineer CS 2017, Question 14: see the question image.

Figure for question 14, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: C. Option C

Question 15

ISRO Scientist/Engineer CS 2017, Question 15: see the question image.

Figure for question 15, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: B. Option B

Question 16

ISRO Scientist/Engineer CS 2017, Question 16: see the question image.

Figure for question 16, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: C. Option C

Question 17

ISRO Scientist/Engineer CS 2017, Question 17: see the question image.

Figure for question 17, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: B. Option B

Question 18

ISRO Scientist/Engineer CS 2017, Question 18: see the question image.

Figure for question 18, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: C. Option C

Question 19

ISRO Scientist/Engineer CS 2017, Question 19: see the question image.

Figure for question 19, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: D. Option D

Question 20

ISRO Scientist/Engineer CS 2017, Question 20: see the question image.

Figure for question 20, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: B. Option B

Question 21

ISRO Scientist/Engineer CS 2017, Question 21: see the question image.

Figure for question 21, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: D. Option D

Question 22

ISRO Scientist/Engineer CS 2017, Question 22: see the question image.

Figure for question 22, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: C. Option C

Question 23

ISRO Scientist/Engineer CS 2017, Question 23: see the question image.

Figure for question 23, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: D. Option D

Question 24

ISRO Scientist/Engineer CS 2017, Question 24: see the question image.

Figure for question 24, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: A. Option A

Question 25

ISRO Scientist/Engineer CS 2017, Question 25: see the question image.

Figure for question 25, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: D. Option D

Question 26

ISRO Scientist/Engineer CS 2017, Question 26: see the question image.

Figure for question 26, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: B. Option B

Question 27

ISRO Scientist/Engineer CS 2017, Question 27: see the question image.

Figure for question 27, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: A. Option A

Question 28

The number of structurally different possible binary trees with 4 nodes is

  • A. 14
  • B. 12
  • C. 336
  • D. 168

Answer: A. 14

Question 29

ISRO Scientist/Engineer CS 2017, Question 29: see the question image.

Figure for question 29, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: C. Option C

Question 30

Which of the following are used to generate a message digest by the network security protocols? (P) SHA-256 (Q) AES (R) DES (S) MD5

  • A. P and S only
  • B. P and Q only
  • C. R and S only
  • D. P and R only

Answer: A. P and S only

Question 31

ISRO Scientist/Engineer CS 2017, Question 31: see the question image.

Figure for question 31, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: D. Option D

Question 32

ISRO Scientist/Engineer CS 2017, Question 32: see the question image.

Figure for question 32, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: A. Option A

Question 33

Assume that Source S and Destination D are connected through an intermediate router R. How many times a packet has to visit the network layer and data link layer during a transmission from S to D?

  • A. Network layer - 4 times, Data link layer - 4 times
  • B. Network layer - 4 times, Data link layer - 6 times
  • C. Network layer - 2 times, Data link layer - 4 times
  • D. Network layer - 3 times, Data link layer - 4 times

Answer: D. Network layer - 3 times, Data link layer - 4 times

Question 34

Generally TCP is reliable and UDP is not reliable. DNS which has to be reliable uses UDP because

  • A. UDP is slower
  • B. DNS servers has to keep connections
  • C. DNS requests are generally very small and fit well within UDP segments
  • D. None of these

Answer: C. DNS requests are generally very small and fit well within UDP segments

Question 35

ISRO Scientist/Engineer CS 2017, Question 35: see the question image.

Figure for question 35, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: C. Option C

Question 36

ISRO Scientist/Engineer CS 2017, Question 36: see the question image.

Figure for question 36, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: B. Option B

Question 37

A two way set associative cache memory unit with a capacity of 16 KB is built using a block size of 8 words. The word length is 32 bits. The physical address space is 4 GB. The number of bits in the TAG, SET fields are

  • A. 20, 7
  • B. 19, 8
  • C. 20, 8
  • D. 21, 9

Answer: B. 19, 8

Question 38

ISRO Scientist/Engineer CS 2017, Question 38: see the question image.

Figure for question 38, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: A. Option A

Question 39

ISRO Scientist/Engineer CS 2017, Question 39: see the question image.

Figure for question 39, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: C. Option C

Question 40

ISRO Scientist/Engineer CS 2017, Question 40: see the question image.

Figure for question 40, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: A. Option A

Question 41

ISRO Scientist/Engineer CS 2017, Question 41: see the question image.

Figure for question 41, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: D. Option D

Question 42

ISRO Scientist/Engineer CS 2017, Question 42: see the question image.

Figure for question 42, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: A. Option A

Question 43

Consider an instruction of the type LW R1, 20(R2) which during execution reads a 32 bit word from memory and stores it in a 32 bit register R1. The effective address of the memory location is obtained by adding a constant 20 and contents of R2. Which one best reflects the source operand

  • A. Immediate addressing
  • B. Register addressing
  • C. Register Indirect addressing
  • D. Indexed addressing

Answer: C. Register Indirect addressing

Question 44

ISRO Scientist/Engineer CS 2017, Question 44: see the question image.

Figure for question 44, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: C. Option C

Question 45

ISRO Scientist/Engineer CS 2017, Question 45: see the question image.

Figure for question 45, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: D. Option D

Question 46

ISRO Scientist/Engineer CS 2017, Question 46: see the question image.

Figure for question 46, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: B. Option B

Question 47

ISRO Scientist/Engineer CS 2017, Question 47: see the question image.

Figure for question 47, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: C. Option C

Question 48

ISRO Scientist/Engineer CS 2017, Question 48: see the question image.

Figure for question 48, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: A. Option A

Question 49

ISRO Scientist/Engineer CS 2017, Question 49: see the question image.

Figure for question 49, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: D. Option D

Question 50

ISRO Scientist/Engineer CS 2017, Question 50: see the question image.

Figure for question 50, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: C. Option C

Question 51

ISRO Scientist/Engineer CS 2017, Question 51: see the question image.

Figure for question 51, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: D. Option D

Question 52

ISRO Scientist/Engineer CS 2017, Question 52: see the question image.

Figure for question 52, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: D. Option D

Question 53

The minimum number of stacks needed to implement a queue is

  • A. 3
  • B. 1
  • C. 2
  • D. 4

Answer: C. 2

Question 54

A strictly binary tree with 10 leaves

  • A. cannot have more than 19 nodes
  • B. has exactly 19 nodes
  • C. has exactly 17 nodes
  • D. has exactly 20 nodes

Answer: B. has exactly 19 nodes

Question 55

What is the maximum height of any AVL tree with 7 nodes? Assume that height of tree with single node is 0.

  • A. 2
  • B. 3
  • C. 4
  • D. 5

Answer: B. 3

Question 56

ISRO Scientist/Engineer CS 2017, Question 56: see the question image.

Figure for question 56, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: A. Option A

Question 57

The in-order and pre-order traversal of a binary tree are d b e a f c g and a b d e c f g respectively. The post order traversal of a binary tree is

  • A. e d b g f c a
  • B. e d b f g c a
  • C. d e b f g c a
  • D. d e f g b c a

Answer: C. d e b f g c a

Question 58

ISRO Scientist/Engineer CS 2017, Question 58: see the question image.

Figure for question 58, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: B. Option B

Question 59

ISRO Scientist/Engineer CS 2017, Question 59: see the question image.

Figure for question 59, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: C. Option C

Question 60

ISRO Scientist/Engineer CS 2017, Question 60: see the question image.

Figure for question 60, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: D. Option D

Question 61

Consider the following scheduling : Matching the table in the order A, B, C gives

Figure for question 61, ISRO Computer Science (CSE) 2017

  • A. t, u, s
  • B. s, t, u
  • C. u, s, t
  • D. u, t, s

Answer: A. t, u, s

Question 62

A system uses FIFO policy for page replacement. It has 4 page frames with no pages loaded to begin with. The system first accesses 50 distinct pages in some order and then accesses the same 50 pages in reverse order. How many page faults will occur?

  • A. 96
  • B. 100
  • C. 97
  • D. 92

Answer: A. 96

Question 63

ISRO Scientist/Engineer CS 2017, Question 63: see the question image.

Figure for question 63, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: D. Option D

Question 64

ISRO Scientist/Engineer CS 2017, Question 64: see the question image.

Figure for question 64, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: A. Option A

Question 65

ISRO Scientist/Engineer CS 2017, Question 65: see the question image.

Figure for question 65, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: C. Option C

Question 66

Which languages necessarily need heap allocation in the run time environment?

  • A. Those that support recursion
  • B. Those that use dynamic scoping
  • C. Those that use global variables
  • D. Those that allow dynamic data structures

Answer: D. Those that allow dynamic data structures

Question 67

ISRO Scientist/Engineer CS 2017, Question 67: see the question image.

Figure for question 67, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: D. Option D

Question 68

Consider the following table : Matching A, B, C, D in the same order gives :

Figure for question 68, ISRO Computer Science (CSE) 2017

  • A. p, q, r, s
  • B. q, r, s, p
  • C. r, s, q, p
  • D. r, s, p, q

Answer: C. r, s, q, p

Question 69

Consider a disk sequence with 100 cylinders. The request to access the cylinder occur in the following sequence : 4, 34, 10, 7, 19, 73, 2, 15, 6, 20 Assuming that the head is currently at cylinder 50, what is the time taken to satisfy all requests if it takes 2 ms to move from one cylinder to adjacent one and shortest seek time first policy is used?

  • A. 190
  • B. 238
  • C. 233
  • D. 276

Answer: B. 238

Question 70

ISRO Scientist/Engineer CS 2017, Question 70: see the question image.

Figure for question 70, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: B. Option B

Question 71

ISRO Scientist/Engineer CS 2017, Question 71: see the question image.

Figure for question 71, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: B. Option B

Question 72

ISRO Scientist/Engineer CS 2017, Question 72: see the question image.

Figure for question 72, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: C. Option C

Question 73

ISRO Scientist/Engineer CS 2017, Question 73: see the question image.

Figure for question 73, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: C. Option C

Question 74

ISRO Scientist/Engineer CS 2017, Question 74: see the question image.

Figure for question 74, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: A. Option A

Question 75

In IEEE floating point representation, the hexadecimal number 0xC0000000 corresponds to

  • A. -3.0
  • B. -1.0
  • C. -4.0
  • D. -2.0

Answer: D. -2.0

Question 76

Which of the following set of components is sufficient to implement any arbitrary Boolean function?

  • A. XOR gates, NOT gates
  • B. AND gates, XOR gates and 1
  • C. 2 to 1 multiplexer
  • D. Three input gates that output (A.B) + C for the inputs A, B, C

Answer: B. AND gates, XOR gates and 1

Question 77

Consider the following : Matching A, B, C, D in the same order gives.

Figure for question 77, ISRO Computer Science (CSE) 2017

  • A. r, p, s, q
  • B. p, r, q, s
  • C. s, r, q, p
  • D. q, r, s, p

Answer: A. r, p, s, q

Question 78

ISRO Scientist/Engineer CS 2017, Question 78: see the question image.

Figure for question 78, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: B. Option B

Question 79

ISRO Scientist/Engineer CS 2017, Question 79: see the question image.

Figure for question 79, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: C. Option C

Question 80

ISRO Scientist/Engineer CS 2017, Question 80: see the question image.

Figure for question 80, ISRO Computer Science (CSE) 2017

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Answer: D. Option D

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