CRPF RADIO OPERATOR/ CIPHER/ RADIO FITTER COMPLETE MODEL PAPER 2025
Total Marks: 100 | Time: 2.5 Hours
PART 1: OBJECTIVE TYPE (75 Marks)
COMPUTER (30 Questions × 1 Mark = 30 Marks)
- What is the full form of RAM?
a) Random Access Memory
b) Read Access Memory
c) Random Alternate Memory
d) Read Alternate Memory - Which key combination is used for paste?
a) Ctrl+C
b) Ctrl+V
c) Ctrl+X
d) Ctrl+P - MS Excel is used for:
a) Word processing
b) Spreadsheet calculations
c) Presentation
d) Database management - The brain of computer is:
a) CPU
b) Monitor
c) Keyboard
d) Mouse - 1 GB = ______ MB
a) 1000
b) 1024
c) 1048
d) 1012 - Which is an output device?
a) Keyboard
b) Mouse
c) Printer
d) Scanner - Internet is an example of:
a) LAN
b) WAN
c) MAN
d) PAN - Which is not an operating system?
a) Windows
b) Linux
c) MS Word
d) Android - The extension .doc is used for:
a) Excel files
b) Word files
c) PowerPoint files
d) Image files - Which protocol is used for websites?
a) HTTP
b) FTP
c) SMTP
d) TCP - Which device connects multiple computers in a network?
a) Router
b) CPU
c) Monitor
d) Keyboard - What does CPU stand for?
a) Central Processing Unit
b) Computer Processing Unit
c) Central Program Unit
d) Computer Program Unit - Which software is used for creating presentations?
a) MS Word
b) MS Excel
c) MS PowerPoint
d) MS Access - What is the primary function of an operating system?
a) Manage hardware and software resources
b) Create documents
c) Browse internet
d) Play games - Which is a volatile memory?
a) RAM
b) ROM
c) Hard Disk
d) Pen Drive - What does URL stand for?
a) Uniform Resource Locator
b) Universal Resource Locator
c) Uniform Resource Link
d) Universal Resource Link - Which is an input device?
a) Printer
b) Monitor
c) Speaker
d) Scanner - What is the full form of PDF?
a) Portable Document Format
b) Personal Document Format
c) Portable Data Format
d) Personal Data Format - Which key is used to refresh a webpage?
a) F1
b) F5
c) F10
d) F12 - What does LAN stand for?
a) Local Area Network
b) Large Area Network
c) Local Access Network
d) Large Access Network - Which programming language is used for web development?
a) HTML
b) C++
c) Java
d) Python - What is the function of antivirus software?
a) Protect against viruses
b) Increase internet speed
c) Create documents
d) Manage files - Which is a storage device?
a) Hard Disk
b) Monitor
c) Keyboard
d) Mouse - What does BIOS stand for?
a) Basic Input Output System
b) Basic Input Operating System
c) Basic Internet Output System
d) Basic Internet Operating System - Which is a social media platform?
a) Facebook
b) MS Word
c) Windows
d) Excel - What is the full form of USB?
a) Universal Serial Bus
b) Universal System Bus
c) United Serial Bus
d) United System Bus - Which key is used for help?
a) F1
b) F2
c) F3
d) F4 - What does WWW stand for?
a) World Wide Web
b) World Web Wide
c) Wide World Web
d) Web World Wide - Which is a search engine?
a) Google
b) Windows
c) MS Office
d) Photoshop - What is the function of RAM?
a) Temporary storage
b) Permanent storage
c) Processing
d) Display
MATHEMATICS (20 Questions × 1 Mark = 20 Marks)
- 55 ÷ 5.5 – 0.5 = ?
a) 9.5
b) 10
c) 8.5
d) 10.5 - If 20% of a = 40% of b, then a:b = ?
a) 2:3
b) 3:2
c) 1:3
d) 2:1 - The average of even numbers from 1 to 20 is:
a) 12
b) 11
c) 10
d) 110 - A sum of money doubles itself in 8 years at simple interest. Rate of interest is:
a) 12.5%
b) 12.8%
c) 12.9%
d) 13% - A train 270 m long passes a standing man in 24 seconds. Speed of train is:
a) 45 km/h
b) 40.5 km/h
c) 20 km/h
d) 20.5 km/h - If length of rectangle is increased by 40% and breadth reduced by 20%, area changes by:
a) increased by 8%
b) increased by 20%
c) increased by 12%
d) increased by 16% - The average of 5 consecutive even numbers is 52. Product of 2nd and 5th number is:
a) 2916
b) 2988
c) 3000
d) 2800 - A person crosses 400m long street in 8 minutes. Speed in km/h is:
a) 5
b) 0.6
c) 3.2
d) 3 - 71% of a number is more than its 46% by 120. 30% of that number is:
a) 160
b) 150
c) 144
d) 148 - Least number to be added to 3986 to make it perfect square is:
a) 118
b) 95
c) 110
d) 100 - 26 × 2³ ÷ 2⁴ = 2ˣ then x is equal to:
a) 2
b) 3
c) 5
d) 7 - 15 years hence, Priya will be four times as old as she was 15 years ago. Her present age is:
a) 25 years
b) 15 years
c) 40 years
d) 35 years - Rajan and Sajan started business with Rs. 14200 and Rs. 15600. Total profit Rs. 74500. Rajan’s share is:
a) Rs. 39000
b) Rs. 39600
c) Rs. 35000
d) Rs. 35500 - A and B take Rs. 660 for work. Working alone 6 days and 5 days respectively. A’s share is:
a) Rs. 400
b) Rs. 420
c) Rs. 300
d) Rs. 560 - In how much time will a man cover 4500 m with speed of 15 km/h?
a) 10 min
b) 18 min
c) 24 min
d) 16 min - Mohan bought cycle for Rs. 475 and sold at loss of 8%. Selling price is:
a) Rs. 453
b) Rs. 419
c) Rs. 441
d) Rs. 437 - Point (-10,0) lies:
a) on negative direction of x-axis
b) on negative direction of y-axis
c) in third quadrant
d) in fourth quadrant - A box contains 3 blue, 2 white and 4 red marbles. Probability of drawing blue marble is:
a) 1/3
b) 1/2
c) 2/3
d) 1 - Simple interest on Rs. 18440 at 15% for 4 years is:
a) Rs. 11075
b) Rs. 12205
c) Rs. 11500
d) Rs. 11064 - Sum of 15% and 10% of a number is 70. Twice of that number is:
a) 440
b) 280
c) 560
d) 140
PHYSICS (20 Questions × 1 Mark = 20 Marks)
- In case of short circuit, ______ current flows:
a) Zero
b) Very low
c) Infinite
d) Normal - Ohm is unit of:
a) Resistance
b) Voltage
c) Current
d) Capacitance - If 100W bulb is ON for 10 hours, consumed electricity is:
a) 100 watts
b) 100 watts per hour
c) 1000 watts
d) 1 kWh - Working principle of transformer is:
a) Newton’s first law
b) Electromagnetic induction
c) Kirchhoff’s law
d) Thermodynamics - As per Ohm’s Law:
a) V = I × R
b) I = R/V
c) V = I/R
d) R = V × I - X-Ray, Radio wave & Microwave are examples of:
a) Electromagnetic waves
b) Longitudinal waves
c) Transverse waves
d) Mechanical waves - LED stands for:
a) Light Emitting Display
b) Light Emitting Detector
c) Light Emitting Diode
d) Light Energy Display - Three terminals of transistor are:
a) Collector, Blas, Ammeter
b) Collector, Base, Case
c) Collector, Blas, Emitter
d) Collector, Base, Emitter - With rise in temperature, resistance of semiconductor:
a) Decreases
b) Remains constant
c) Increases
d) First increases then decreases - Which converts AC to DC?
a) Rectifier
b) Transformer
c) Resistor
d) Transistor - Cathode rays carry:
a) Negative charge
b) Positive charge
c) Both positive & negative
d) Neutral - To pass current through ammeter, it should be connected:
a) Parallel
b) Series
c) Both
d) Any connection - Which cannot be fabricated on IC?
a) Transistors
b) Diodes
c) Resistors
d) Transformers - In house wiring, appliances are connected in:
a) Series
b) Parallel
c) Both
d) Any connection - Temperature, Time, Pressure are:
a) Digital quantities
b) Analog quantities
c) Negative quantities
d) Single quantities - To reduce eddy current, which technique is used?
a) Electroplated core
b) Laminated core
c) Thermal core
d) Optical core - To make amplifier, which component is used?
a) Diode
b) Inductor
c) Transistor
d) Optics - Two resistances 4kΩ & 6kΩ in series with 10V battery. Voltage across each is:
a) 4V & 6V
b) 2V & 3V
c) 5V & 12V
d) 6V & 10V - Connecting wire from negative to positive terminal produces:
a) High resistive circuit
b) Short circuit
c) Schmitt circuit
d) Open circuit - 1200 mV equals:
a) 1.2 V
b) 12 V
c) 0.12 V
d) None
CHEMISTRY (5 Questions × 1 Mark = 5 Marks)
- Charge of electron is:
a) +1.6 × 10⁻¹⁹ C
b) -1.6 × 10⁻¹⁹ C
c) Neutral
d) +1 C - pH of pure water is:
a) 0
b) 7
c) 14
d) 1 - Which is noble gas?
a) Oxygen
b) Nitrogen
c) Argon
d) Chlorine - Chemical symbol for gold is:
a) Ag
b) Au
c) Fe
d) Cu - Which metal is liquid at room temperature?
a) Iron
b) Mercury
c) Copper
d) Aluminum
PART 2: SUBJECTIVE TYPE (25 Marks)
Q1. Read the passage and answer questions: (5 Marks)
Passage:
“In the 21st century, communication technology has revolutionized security operations. The CRPF now uses advanced digital systems, encrypted radios, and satellite networks for instant communication across long distances. Modern technology saves time and reduces confusion during emergencies. However, human discipline and alertness remain equally important as machines.”
Questions:
- What has revolutionized security operations?
- What equipment does CRPF use for communication?
- What are the benefits of modern technology?
- What remains equally important as machines?
- Find word from passage that means “changed completely”.
Word Meanings:
a) Worldwide
b) Harmful
c) Spread
d) Knowledge
e) Progress
Q2. Write an essay on any one topic: (10 Marks)
a) Importance of Cybersecurity in Modern India
b) Role of Discipline in Soldier’s Life
c) Youth and National Integration
Q3. Do as directed: (10 Marks)
- He said, “I am a teacher.” (Change to indirect speech)
- She completed the project on time. (Begin with “The project…”)
- They would play every evening. (Use “used to”)
- When the officer arrived, the meeting started. (Use “No sooner…than”)
- “The message was received.” (Identify voice)
- He is ______ boy in class. (Fill with smart/smarter/smartest)
- It was Sunday, so school was closed. (Use “because”)
- The guard caught the thief. (Change to past perfect)
- Technology has changed our life. (Change voice)
- She is ______ honest officer. (Fill article)
CRPF RADIO OPERATOR/ CIPHER/ RADIO FITTER MODEL PAPER 2025 – ANSWER KEY
PART 1: OBJECTIVE TYPE (75 Marks)
COMPUTER ANSWERS (30 Marks)
- a) Random Access Memory
Explanation: RAM stands for Random Access Memory, a volatile memory used for temporary data storage. - b) Ctrl+V
Explanation: Ctrl+V is the standard keyboard shortcut for paste operation. - b) Spreadsheet calculations
Explanation: MS Excel is primarily used for spreadsheet calculations and data analysis. - a) CPU
Explanation: CPU (Central Processing Unit) is considered the brain of the computer. - b) 1024
*Explanation: 1 GB = 1024 MB in binary system.* - c) Printer
Explanation: Printer is an output device that produces hard copies. - b) WAN
Explanation: Internet is an example of Wide Area Network (WAN). - c) MS Word
Explanation: MS Word is application software, not an operating system. - b) Word files
Explanation: .doc extension is used for Microsoft Word documents. - a) HTTP
Explanation: HTTP (HyperText Transfer Protocol) is used for websites. - a) Router
Explanation: Router connects multiple computers in a network. - a) Central Processing Unit
Explanation: CPU stands for Central Processing Unit. - c) MS PowerPoint
Explanation: MS PowerPoint is used for creating presentations. - a) Manage hardware and software resources
Explanation: OS manages hardware and software resources. - a) RAM
Explanation: RAM is volatile memory that loses data when power is off. - a) Uniform Resource Locator
Explanation: URL stands for Uniform Resource Locator. - d) Scanner
Explanation: Scanner is an input device. - a) Portable Document Format
Explanation: PDF stands for Portable Document Format. - b) F5
Explanation: F5 key is used to refresh webpage. - a) Local Area Network
Explanation: LAN stands for Local Area Network. - a) HTML
Explanation: HTML is used for web development. - a) Protect against viruses
Explanation: Antivirus software protects against viruses. - a) Hard Disk
Explanation: Hard Disk is a storage device. - a) Basic Input Output System
Explanation: BIOS stands for Basic Input Output System. - a) Facebook
Explanation: Facebook is a social media platform. - a) Universal Serial Bus
Explanation: USB stands for Universal Serial Bus. - a) F1
Explanation: F1 key is used for help. - a) World Wide Web
Explanation: WWW stands for World Wide Web. - a) Google
Explanation: Google is a search engine. - a) Temporary storage
Explanation: RAM provides temporary storage.
MATHEMATICS ANSWERS (20 Marks)
- a) 9.5
*Explanation: 55 ÷ 5.5 = 10, 10 – 0.5 = 9.5* - d) 2:1
*Explanation: 0.2a = 0.4b ⇒ a/b = 2 ⇒ a:b = 2:1* - b) 11
*Explanation: Even numbers 2,4,6,…,20, Average = (2+20)/2 = 11* - a) 12.5%
*Explanation: SI = P, P = (P×R×8)/100 ⇒ R = 100/8 = 12.5%* - b) 40.5 km/h
*Explanation: Speed = 270/24 = 11.25 m/s = 11.25×18/5 = 40.5 km/h* - c) increased by 12%
*Explanation: New area = 1.4L × 0.8B = 1.12LB ⇒ 12% increase* - d) 2800
*Explanation: Numbers: 48,50,52,54,56, B=50, E=56, Product=2800* - d) 3
*Explanation: Speed=400/8=50 m/min=50×60/1000=3 km/h* - c) 144
*Explanation: 0.71x – 0.46x = 120 ⇒ 0.25x=120 ⇒ x=480, 30% of 480=144* - c) 110
*Explanation: 63²=3969, 64²=4096, Difference=4096-3986=110* - c) 5
*Explanation: 2⁶ × 2³ ÷ 2⁴ = 2⁶⁺³⁻⁴ = 2⁵ ⇒ x=5* - a) 25 years
*Explanation: x+15=4(x-15) ⇒ x+15=4x-60 ⇒ 75=3x ⇒ x=25* - d) Rs. 35500
*Explanation: Ratio=14200:15600=71:78, Rajan’s share=(71/149)×74500=35500* - c) Rs. 300
*Explanation: Work ratio=1/6:1/5=5:6, A’s share=(5/11)×660=300* - b) 18 min
*Explanation: Speed=15 km/h=250 m/min, Time=4500/250=18 min* - d) Rs. 437
*Explanation: Loss=8% of 475=38, SP=475-38=437* - a) on negative direction of x-axis
*Explanation: y=0, x=-10 ⇒ on x-axis left of origin* - a) 1/3
*Explanation: Total=9, Blue=3, Probability=3/9=1/3* - d) Rs. 11064
*Explanation: SI=(18440×15×4)/100=18440×0.6=11064* - c) 560
*Explanation: 0.15x+0.10x=70 ⇒ 0.25x=70 ⇒ x=280, Twice=560*
PHYSICS ANSWERS (20 Marks)
- c) Infinite
Explanation: Short circuit has almost zero resistance, so current becomes very high. - a) Resistance
Explanation: Ohm (Ω) is unit of electrical resistance. - d) 1 kWh
*Explanation: Energy=Power×Time=100W×10h=1000Wh=1kWh* - b) Electromagnetic induction
Explanation: Transformer works on principle of electromagnetic induction. - a) V = I × R
Explanation: Ohm’s Law states Voltage = Current × Resistance. - a) Electromagnetic waves
Explanation: X-ray, radio wave, microwave are electromagnetic waves. - c) Light Emitting Diode
Explanation: LED stands for Light Emitting Diode. - d) Collector, Base, Emitter
Explanation: Three terminals of transistor are Collector, Base, Emitter. - a) Decreases
Explanation: Semiconductors have negative temperature coefficient. - a) Rectifier
Explanation: Rectifier converts AC to DC. - a) Negative charge
Explanation: Cathode rays are streams of electrons (negative charge). - b) Series
Explanation: Ammeter must be connected in series to measure current. - d) Transformers
Explanation: Transformers cannot be fabricated on IC due to size. - b) Parallel
Explanation: House wiring uses parallel connection. - b) Analog quantities
Explanation: These are continuous physical quantities. - b) Laminated core
Explanation: Laminated core reduces eddy currents. - c) Transistor
Explanation: Transistor is used to make amplifiers. - a) 4V & 6V
*Explanation: Total R=10kΩ, I=1mA, V1=4V, V2=6V* - b) Short circuit
Explanation: Direct connection creates short circuit. - a) 1.2 V
*Explanation: 1200 mV = 1200/1000 V = 1.2 V*
CHEMISTRY ANSWERS (5 Marks)
- b) -1.6 × 10⁻¹⁹ C
Explanation: Electron carries negative charge of 1.6×10⁻¹⁹ Coulomb. - b) 7
Explanation: Pure water is neutral with pH 7. - c) Argon
Explanation: Argon is noble gas from Group 18. - b) Au
Explanation: Chemical symbol for gold is Au (from Latin aurum). - b) Mercury
Explanation: Mercury is only metal liquid at room temperature.
PART 2: SUBJECTIVE TYPE (25 Marks)
Q1. Passage Answers (5 Marks)
Answers:
- Communication technology has revolutionized security operations.
- Advanced digital systems, encrypted radios, and satellite networks.
- Saves time and reduces confusion during emergencies.
- Human discipline and alertness remain equally important.
- Revolutionized
Word Meanings:
a) Global
b) Harmful
c) Spread
d) Awareness
e) Progress
Q2. Essay (10 Marks)
Sample Essay Outline – “Importance of Cybersecurity”:
- Introduction: Digital era and cyber threats
- Body: Types of cyber crimes, need for protection, role of awareness
- Conclusion: Importance for national security
Q3. Grammar (10 Marks)
- He said that he was a teacher.
- The project was completed on time by her.
- They used to play every evening.
- No sooner did the officer arrive than the meeting started.
- Passive voice
- Smartest
- School was closed because it was Sunday.
- The guard had caught the thief.
- Our life has been changed by technology.
- an
TOTAL SCORE CALCULATION:
- Part 1: 75 marks (Objective)
- Part 2: 25 marks (Subjective)
GRAND TOTAL: 100 MARKS
Good collection sir