SOF NATIONAL CYBER OLYMPIAD (NCO) CLASS 4 – PRACTICE PAPER (SET 1)
Download NCO Class 4 Practice Paper Set 1 with solved answers and explanations. Best free study material for SOF National Cyber Olympiad exam preparation.
■ SECTION 1: LOGICAL REASONING (Q1 – Q10) (1 Mark Each)
- Find the next number in the given series: 4, 8, 16, 32, ?
| A. 48 | B. 64 |
| C. 56 | D. 60 |
- If Varun is facing North and he takes a 3/4 turn clockwise, which direction will he be facing?
| A. East | B. South |
| C. West | D. North-East |
- Which of the following options shows the correct mirror image of the word ‘CYBER’ when the mirror is placed vertically on the right?
| A. ЯƎBYƆ | B. RƎBYC |
| C. ƆYBƎR | D. REBYC |
- Count the total number of triangles in a square divided into 4 equal quarters by its diagonals.
| A. 4 | B. 6 |
| C. 8 | D. 10 |
- Select the odd one out.
| A. Keyboard | B. Monitor |
| C. Mouse | D. Joystick |
- If ‘Red’ is called ‘Blue’, ‘Blue’ is called ‘Green’, and ‘Green’ is called ‘Yellow’, what is the color of clear sky?
| A. Blue | B. Green |
| C. Yellow | D. Red |
- Find the missing number in the pattern: 3, 7, 15, 31, ?
| A. 63 | B. 55 |
| C. 62 | D. 60 |
- Priya is 5th from the left end in a row of 12 students. What is her position from the right end?
| A. 7th | B. 8th |
| C. 9th | D. 6th |
- Which figure completes the pattern in 2×2 grid where top-left has 1 dot, top-right has 2 dots, bottom-left has 3 dots?
| A. 4 dots | B. 5 dots |
| C. 6 dots | D. 2 dots |
- How many lines of symmetry does a regular square have?
| A. 2 | B. 3 |
| C. 4 | D. 8 |
■ SECTION 2: COMPUTERS & INFORMATION TECHNOLOGY (Q11 – Q30) (1 Mark Each)
- Which shortcut key is used to paste copied text in MS-Word 2010?
| A. Ctrl + C | B. Ctrl + X |
| C. Ctrl + V | D. Ctrl + P |
- Which of the following is an input device used to scan barcodes on products in supermarkets?
| A. OMR | B. Barcode Reader |
| C. MICR | D. Plotter |
- Which generation of computers used Vacuum Tubes?
| A. First Generation | B. Second Generation |
| C. Third Generation | D. Fourth Generation |
- What type of tool in MS-Paint is used to pick a color from an existing drawing?
| A. Color Picker Tool | B. Fill with Color Tool |
| C. Brush Tool | D. Eyedropper |
- Which function key is used to view a document in full screen or start a slideshow?
| A. F1 | B. F5 |
| C. F11 | D. F12 |
- Which computer memory loses its data when power is switched off?
| A. ROM | B. RAM |
| C. Hard Disk | D. Flash Drive |
- What is the full form of URL in web browsing?
| A. Uniform Resource Locator | B. Universal Resource Link |
| C. Unified Resource Locator | D. Universal Record Locator |
- Which network spans across a whole city?
| A. LAN | B. PAN |
| C. MAN | D. WAN |
- Which tab in MS-Word 2010 contains ‘Spelling & Grammar’ tool?
| A. Home | B. Insert |
| C. Page Layout | D. Review |
- What is the capacity of 1 Gigabyte (GB) in Megabytes (MB)?
| A. 1000 MB | B. 1024 MB |
| C. 512 MB | D. 2048 MB |
- Which secondary storage device reads data sequentially?
| A. Hard Disk | B. Magnetic Tape |
| C. Pen Drive | D. DVD |
- Which software program protects a computer system from viruses?
| A. MS-Word | B. Antivirus |
| C. Operating System | D. Photoshop |
- Which device is specifically used to print high-quality large engineering drawings and vector graphics?
| A. Dot Matrix Printer | B. Plotter |
| C. Inkjet Printer | D. Laser Printer |
- Who among the following designed the Analytical Engine?
| A. Blaise Pascal | B. Charles Babbage |
| C. John Napier | D. Herman Hollerith |
- Which feature of Windows 7 allows you to minimize all open windows except the active one by shaking it?
| A. Aero Peek | B. Aero Shake |
| C. Aero Snap | D. Jump List |
- What does HTTP stand for?
| A. Hypertext Transfer Protocol | B. High Transfer Text Protocol |
| C. Hypertext Transmission Process | D. Hyper Terminal Transfer Protocol |
- Which formatting effect makes text appear slightly below the normal baseline (e.g., H₂O)?
| A. Superscript | B. Subscript |
| C. Strikethrough | D. Underline |
- Which component of CPU acts as a control unit managing data flow between parts?
| A. ALU | B. CU |
| C. MU | D. RAM |
- Which wireless technology is used for short-range communication like TV remote controls?
| A. Wi-Fi | B. Bluetooth |
| C. Infrared | D. Satellite |
- Which option in MS-Paint is used to flip an image vertically?
| A. Rotate 90° | B. Flip Vertical |
| C. Flip Horizontal | D. Skew |
■ SECTION 3: ACHIEVERS SECTION (Q31 – Q35) (2 Marks Each)
- Match Column-I with Column-II regarding Computer History:
Column-I:
(a) Abacus (b) Pascaline (c) ENIAC
Column-II:
(i) First electronic computer (ii) Wooden frame with rods (iii) First mechanical calculator
| A. (a)-(ii), (b)-(iii), (c)-(i) | B. (a)-(i), (b)-(ii), (c)-(iii) |
| C. (a)-(iii), (b)-(i), (c)-(ii) | D. (a)-(ii), (b)-(i), (c)-(iii) |
- Read the statements:
Statement 1: RAM is permanent and non-volatile memory.
Statement 2: Hard Disk data remains intact when computer is turned off.
| A. Both statements are true | B. Both statements are false |
| C. Statement 1 is true, Statement 2 is false | D. Statement 1 is false, Statement 2 is true |
- What will happen if you press ‘Ctrl + Shift + >’ keys in MS-Word 2010 after selecting text?
| A. Font size decreases | B. Font size increases |
| C. Text becomes superscript | D. Text becomes subscript |
- Which sequence of operations in MS-Paint will invert a square drawing upside down?
| A. Rotate 180° | B. Flip Horizontal |
| C. Skew 45° | D. Zoom In |
- Identify the network type: ‘A doctor monitoring patient health parameters via wearable devices in a room.’
| A. WAN | B. MAN |
| C. BAN / PAN | D. CAN |
ANSWER KEY & DETAILED EXPLANATIONS
| Q. No. | Correct Option | Explanation / Reason |
| 1 | B | The series doubles each time: 4×2=8, 8×2=16, 16×2=32, 32×2=64. |
| 2 | C | Facing North, 1/4 turn clockwise = East, 1/2 turn = South, 3/4 turn = West. |
| 3 | A | In vertical mirror reflection, characters invert horizontally from right to left. |
| 4 | C | 4 small triangles + 4 large composite triangles formed by diagonals = 8 triangles. |
| 5 | B | Monitor is an output device, while Keyboard, Mouse, and Joystick are input devices. |
| 6 | B | Clear sky is Blue. Since ‘Blue’ is called ‘Green’, the answer is Green. |
| 7 | A | Pattern is (Previous × 2) + 1: 3×2+1=7, 7×2+1=15, 15×2+1=31, 31×2+1=63. |
| 8 | B | Position from right = (Total – Position from left) + 1 = (12 – 5) + 1 = 8th. |
| 9 | A | Dots increase sequentially by 1 in clockwise order: 1, 2, 3, so next is 4 dots. |
| 10 | C | A square has 4 lines of symmetry (2 diagonals + 2 midpoints of opposite sides). |
| 11 | C | Ctrl + V is the standard shortcut key for Paste. |
| 12 | B | Barcode Reader scans black-and-white lines (barcodes) printed on products. |
| 13 | A | First-generation computers (1940-1956) used vacuum tubes. |
| 14 | A | Color Picker / Eyedropper tool allows picking exact colors from canvas. |
| 15 | C | F11 is used for Full Screen mode in MS-Paint / Web browsers. |
| 16 | B | RAM (Random Access Memory) is volatile memory that loses data without power. |
| 17 | A | URL stands for Uniform Resource Locator. |
| 18 | C | MAN (Metropolitan Area Network) covers a city-wide geographic area. |
| 19 | D | Spelling & Grammar tool is located under the Review tab in MS-Word. |
| 20 | B | 1 GB = 1024 MB in binary measurement system. |
| 21 | B | Magnetic tapes read and write data in sequential order. |
| 22 | B | Antivirus software detects and removes malicious software/viruses. |
| 23 | B | Plotters use pens to draw continuous high-precision vector lines for blueprints. |
| 24 | B | Charles Babbage designed the Analytical Engine in 1837. |
| 25 | B | Aero Shake minimizes all inactive windows when you shake the active title bar. |
| 26 | A | HTTP stands for Hypertext Transfer Protocol. |
| 27 | B | Subscript places text lower than normal baseline (e.g., H₂O). |
| 28 | B | CU (Control Unit) manages and coordinates all operations of the computer. |
| 29 | C | Infrared signals are short-range line-of-sight wireless waves used in remote controls. |
| 30 | B | Flip Vertical flips the image along its horizontal axis (upside down). |
| 31 | A | Abacus uses wooden frame with rods (a-ii); Pascaline is 1st mechanical calculator (b-iii); ENIAC is 1st electronic computer (c-i). |
| 32 | D | Statement 1 is false (RAM is volatile). Statement 2 is true (Hard disk is non-volatile permanent storage). |
| 33 | B | Ctrl + Shift + > increases the font size of selected text in MS-Word. |
| 34 | A | Rotating by 180° turns an image complete upside down. |
| 35 | C | BAN (Body Area Network) / PAN (Personal Area Network) covers short-range personal device networks. |
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