PRL Scientific Assistant Computer Science Previous Paper | Physical Research Laboratory Scientific Assistant CS/IT Paper 2019
Date of Exam – 10.02.2019
PRL Scientific Assistant CS Previous Paper 2019
DSSSB Delhi has published the Junior Scientific Assistant Recruitment 2026 in the discipline Biology, Ballistics, Quality Control, Photography, Cyber Forensic, Crime Scene, Mobile Forensic Unit, Finger Print and Physics. You can apply on or before 15th July 2026 throgh the official website https://dsssb.delhi.gov.in
Here, we are publishing the DSSSB Junior Scientific Assistant Model question paper, which will be helpful to you for the preparation of said examination.
| Sr. No. | Questions |
| 1 | Which of the following best describes UPS device function, |
(a) It increased the storage capacity of a computer system
(b) It increases the process speed
(c) It provides backup power in the event of a power cut
(d) None of the above
Ans –(c)2When an attempt is to make a machine or network resource unavailable to its intended users, the attack is called
(a) denial-of-service-attack
(b) slow read attack
(c) spear phishing attack
(d) vishing attack
Ans –(a)3In case of asymmetric encryption, which statement is true?
(a) Same key is used for encryption and decryption process
(b) Different keys are used encryption and decrypton process
(c) No key is requied for encryption and decryption process
(d) None of the above mentioned
Ans – (b)4Which one of the following is not an attack, but a search for vulnerable services to exploit?
(a) denial of service
(b) port scanning
(c) memory access violation
(d) dumpster diving
Ans –(b)5In OSI model of computer networking, which layer lies between transport layer and data link layer?
(a) physical
(b) Network
(c) Application
(d) Session
Ans –(b)6Which of the following keyword in C language is used within loops to abandon processing and leave the loop?
(a) do
(b) continue
(c) goto
(d) break
Ans-(d)7Which SQL query statement is used to remove a table and all its data from the database?
(a) Create table
(b) Alter table
(c) Drop table
(d) None of the above8What do you mean by broadcasting in Networking?
(a) It means addressing a packet to a particular machine only
(b) It means addressing a packet to some machines
(c) It means addressing a packet to all machines in given network
(d) None of the above
Ans – (c)9What is the typical range of Ephemeral ports?
(a) 1 to 80
(b) 1 to 1024
(c) 80 to 8080
(d) 1024 to 65535
Ans-(c)10Consider the following four RAID configuration oprations
(1) RAID 0
(2) RAID 1
(3) RAID 3
(4) RAID 5
Ans- (b)11Which of the following command will be used to change the mod of the directory named foo recursively to 744?
(a) Chmod-d 744 foo
(b) Chmod – R 744 foo
(c) Chmod – r 744 foo
(d) Chmod – D 744 foo
Ans – (b)12Which is a correct C language statement to output \n on the screen?
(a) printf(“\n”);
(b) printf(“\\\n”);
(c) printf(“\\n”);
(d) printf(“\/n”);
Ans – (c)13In computer science terminology, One kilo bits is equal to
(a) 1000 bits
(b) 1028 bits
(c) 1022 bits
(d) 1024 bits
Ans – (d)14The time for the disk arm to move the heads to the cylinder containing the desired sector is called
(a) Disk time
(b) Seek time
(c) Arm time
(d) Sector time
Ans – (b)15In computer networking what is the use of ping command?
(a) To test a device on the network is reachable
(b) To test a hard disk fault
(c) To test a bug in application
(d) To test a printer’s print quality
Ans – (a)16The DHCP server provides ________to the requesting client.
(a) Protocol
(b) IP address
(c) MAC address
(d) Hostname
Ans –(b)17_____ refers to the act of representing only essential features without including the background details
(a) Data hiding
(b) Data encapsulation
(c) Data abstraction
(d) None of these
Ans – (c)18Perform ‘ 213.23.48.37’ Logical AND ‘255.255.255.240’ what will be the result?
(a) 213.23.48.240
(b) 213.22.48.37
(c) 213.23.48.32
(d) 213.23.48.30
Ans –(c)19When a child class inherits traits from more than one parent class in C++, it is called ______ inheritance.
(a) Hierarchical
(b) Hybrid
(c) Multilevel
(d) Multiple
Ans –(d)20In C++ if base class has constructor with arguments, then it is _____ for the derived class to have constructor and pass the arguments to base class constructor.
(a) Optional
(b) Mandatory
(c) Complier dependent
(d) Error
Ans –(b)21Classes in C++ programming language are _____
(a) Derived data types
(b) User defined data types
(c) Built-in data types
(d) All of the above
Ans –(b)22Reusability of the code can be achieved in C++ programming language through _____
(a) Polymorphism
(b) Encapsulation
(c) Inheritance
(d) Both (a) and (c) options
Ans –(c)23A noiseless 3 KHz Channel transmits a signal with two signal levels. What is the maximum data rate?
(a) 30 Kbps
(b) 6 Kbps
(c) 3 Kbps
(d) 60 Kbps
Ans-(b)24Binary search can be categorized into which of the following?
(a) Brute force technique
(b) Divide and conquer
(c) Greedy algorithm
(d) Dynamic programming
Ans – (b)25Which of the following is/are true about constructors in Java?
(1) Constructor name should be same as class name
(2) If you don’t define a constructor for a class, a default parameter less constructor is automatically created by the compiler
(3) The default constructor calls super () and initializes all variables to default value like 0, NULL
(4) If we want to call parent class constructor, it must be called in first line of constructor.
(a) Only 1
(b) Only 1 and 2
(c) Only 1,2 and 3
(d) All 1, 2, 3 and 4
Ans –(d)26In binary search algorithm, if given an input array = { 2, 5, 7, 99, 899}; key =899; what is the level of recursion?
(a) 5
(b) 2
(c) 3
(d) 4
Ans –(c)27In linked list each node contain minimum of two fields. One field is data field to store the date second field is?
(a) Pointer to character
(b) Pointer to integer
(c) Pointer to node
(d) Node
Ans –(c)28Assuming data type integer (int) is of 4 bytes, then size of int arr[15] would be _____
(a) 15 bytes
(b) 19 bytes
(c) 11 bytes
(d) 60 bytes
Ans –(d)29In the following shell script, how many times will the date commond run?
For I in a i b; do date; done
(a) 0
(b) 1
(c) 2
(d) 3
Ans – (d)30In fiber optics communications the signal source is ______ waves.
(a) Radio
(b) Infrared
(c) Light
(d) Gamma
Ans – (c)31In context of Linux base OS, How can you append the output of a command to a file?
(a) Command >> file
(b) Command < file
(c) Command << file
(d) Command > file
Ans – (a)32How many case entries will be there in the truth table of 3 input NAND gate?
(a) 8
(b) 3
(c) 7
(d) 9
Ans –(a)33The 1st permanent Research Station established in South Polar Region (Antractica) by India is
(a) Maîtri
(b) Dakshin Gangotri
(c) Himadri
(d) Bharti
Ans –(b)34Days and Nights are equal throughout the globe when the Sun is above
(a) Equator
(b) Poles
(c) Topic of Cancer
(d) Topic of Capricorn
Ans –(a)35The currency, which is neither issued by Mint nor by Central Bank, but accepted in the trading as virtual currency is called
(a) Bytecoin
(b) Bitcoin
(c) e-Coin
(d) cryptocoin
Ans –(b)36If purple is called blue, blue is called green, green is called white, white is called orange, then what is the colour of salt as per above coding?
(a) White
(b) Green
(c) Orange
(d) Blue
Ans –(c)37If 2 12 15 1 20 stands for ‘BLOAT’, what does 20 23 9 19 20 stands for ?
(a) TWILT
(b) TWINE
(c) TWINT
(d) TWIST
Ans – (d)38In an examination, a student was asked to find 3/14 of a certain number. By mistake, he found ¾ of that number. His answer was 150 more than the correct answer. Find the given number
(a) 190
(b) 250
(c) 280
(d) 350
Ans –(c)39The cricket ball is lighter than the hockey ball and volleyball is lighter than the football. Hockey ball is lighter than the football but heavier than the tennis ball. Which of the following is the heaviest?
(a) Hockey ball
(b) Cricket ball
(c) Volley ball
(d) Foot ball
Ans –(d)40Change the given sentence into passive voice
Who killed the snake?
(a) Who was killed by the snake?
(b) By whom was the snake killed?
(c) The snake was being killed
(d) By whom is the snake killed?
Ans –(b)41Arrange the following in a meaningful sequential order :
Doctor, Fever, Medicine, Medical Shop
(a) Medical shop, medicine, fever, doctor
(b) Fever, Doctor, Medical shop, Medicine
(c) Doctor, Medical shop, medicine , fever
(d) Medicine , Doctor, Medical shop, Fever
Ans – (b)42Most appropriate synonym of word ‘Tenacity’
(a) Ingratitude
(b) Decimation
(c) Splendor
(d) Perseverance
Ans –(d)43A train covers a distance of 60 km between station A & B in 45 minutes. If its speed is reduced by 5 km/hr, how much time in minutes will it take to cover the same distance?
(a) 80
(b) 42
(c) 48
(d) 50
Ans – (c)44A certain amount of money has to be divided amongst P, Q and R in the ratio 3 : 5 : 6. If R receives Rs. 400 more than Q, then by how much money would P and Q differ in their shares?
(a) Rs. 1200
(b) Rs. 800
(c) Rs. 1600
(d) Data inadequate
Ans –(b)45In a barrack of soldiers there was stock of food for 190 days for 4000 soldiers. After 30 days, 800 soldiers left the barrack. For how many days shall the leftover food last for the remaining soldiers?
(a) 225 days
(b) 200 days
(c) 175 days
(d) 250 days
Ans-(b)
Data Collected By – K. Jeyanthi
Published On – 4th May 2020
Last Updated On – 4th May 2023
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