ICT Revision MCQ Series | OL ICT | First Term Test 2025 Grade 10

Valuable information should be understandable and reduce uncertainty, not be unnecessarily complex.

Manual record-keeping does not involve ICT, whereas e-government, precision farming, and telemedicine rely heavily on ICT.

Efficiency reduces resource usage, accuracy ensures error-free results, speed enables faster processing, and scalability allows growth.

An information system processes raw data into meaningful information using input, processing, and output components.

First-generation computers used vacuum tubes, second-generation used transistors, third-generation used integrated circuits, and fourth-generation used microprocessors.

Integrated circuits were introduced in the third generation, not the fourth.

Data validation ensures data quality before processing. "Data processing" itself is not a validation method.

ICT is widely used in agriculture, healthcare, and education, but manual methods are not always superior to ICT.

OMR reads marked areas, OCR reads printed characters, MICR reads magnetic ink characters, and Barcode Readers read barcodes.

Explanation:
Step 1: Convert the octal number 753₈ to binary.
Each octal digit is represented by 3 bits in binary:

• 7₈ = 111₂
• 5₈ = 101₂
• 3₈ = 011₂
  So, 753₈ = 111101011₂.

Step 2: Group the binary number into sets of 4 bits (starting from the right):
111101011₂ becomes 0001 1110 0111₂.

Step 3: Convert each group of 4 bits into hexadecimal:

• 0001₂ = 1₁₆
• 1110₂ = E₁₆
• 0111₂ = 7₁₆

Thus, 753₈ = 1E7₁₆.

Binary uses 0 and 1, decimal uses 0-9, hexadecimal uses 0-9 and A-F, and octal uses 0-7.

The correct order is Bit < Byte < Kilobyte < Megabyte < Gigabyte < Terabyte.

JPEG is an image compression format, not a coding system for text.

Step 1: Group the binary digits into sets of three (from right to left)

Since octal is base 8 and each octal digit corresponds to 3 binary bits, we group the binary number into sets of 3 bits, padding with zeros on the left if necessary.

Binary:
1110110111101111

Pad with zeros to make it a multiple of 3 (we need 2 more bits):
001 110 110 111 101 111

Now group:

• 001

• 110

• 110

• 111

• 101

• 111

Step 2: Convert each group of 3 binary digits to its octal equivalent

Step 3: Write the final octal number

Putting it all together:
001110110111101111₂ = 166757₈

Step 1: Group the binary digits into sets of four (from right to left)

Since hexadecimal is base 16, and each hexadecimal digit corresponds to 4 binary bits, we group the binary number into 4-bit sections.

Binary:
1110110111101111

Group into 4 bits (no need to add zeros because it's already a multiple of 4):
1110 1101 1110 1111

Step 2: Convert each 4-bit group to a hexadecimal digit

Step 3: Write the final hexadecimal number

Putting it together:
1110110111101111₂ = EDEF₁₆

101101 in binary is 55 in octal (101 = 5, 101 = 5).

Step 1: Group the binary digits into sets of three (from right to left)

Binary:
101101

Grouped into 3-bit sections:
101 101

Step 2: Convert each 3-bit group to its octal equivalent

Step 3: Write the octal number

101101₂ = 55₈

Binary uses base 2, octal uses base 8, hexadecimal uses base 16, and decimal uses base 10.

Computers use digital systems, which rely on binary, decimal, and hexadecimal representations, not analog.

Step 1: Group the binary digits into sets of four (from right to left)

Each hexadecimal digit corresponds to 4 binary bits.

Binary number:
101101101101

Group from right to left in 4 bits:
10 1101 1011 01

Now, add leading zeros to make full 4-bit groups:

→ Add two leading zeros:
0010 1101 1011 1101

Now the groups are:

• 0010

• 1101

• 1011

• 1101

Step 2: Convert each 4-bit group to its hexadecimal value

Step 3: Combine the hex digits

101101101101₂ = 2DBD₁₆

• In BCD, each decimal digit is represented as a 4-bit binary number, making it easy to encode but less efficient in terms of storage compared to pure binary.
• Option (a) is incorrect because BCD typically uses more bits than pure binary.
• Option (c) is incorrect because BCD can represent numbers greater than 99 by extending the number of digits.
• Option (d) is incorrect because BCD encodes each digit separately, unlike pure binary, which converts the entire number into binary.

Thus, the correct answer is (b) BCD represents each decimal digit as a 4-bit binary number.

1024 Gigabytes equals 1 Terabyte, which is larger than 1024 Megabytes or 1024 Kilobytes.

Binary is base 2, decimal is base 10, hexadecimal is base 16, and octal is base 8.

Cache memory has the smallest capacity compared to RAM, hard disks, and USB drives.

11011011 in binary is DB in hexadecimal (D = 13, B = 11).

Step 1: Group the binary digits into sets of four (from right to left)

Binary:
11011011

Grouped into 4 bits:
1101 1011

Step 2: Convert each 4-bit group to its hexadecimal equivalent

Step 3: Write the hexadecimal number

11011011₂ = DB₁₆

Explanation:
In BCD (Binary-Coded Decimal), each decimal digit is represented by a 4-bit binary equivalent.

• The decimal number 102 has three digits: 1, 0, and 2.
• Convert each digit to its 4-bit binary form:
  • 1 = 0001
  • 0 = 0000
  • 2 = 0010
• Combine the binary representations for each digit: 0001 0000 0010.

Thus, the correct answer is (a) 0001 0000 0010.

Binary is fundamental in computers, and hexadecimal simplifies binary. Octal is less common, and decimal is not the only system used in programming.

A pixel is a unit of display resolution, not data storage.

Explanation:
To convert the string "CAB" into binary using ASCII codes:

1. Find the ASCII values of each character:
   • 'C' = 67, 'A' = 65, 'B' = 66.
2. Convert each ASCII value to binary:
   • 67 in binary = 01000011,
   • 65 in binary = 01000001,
   • 66 in binary = 01000010.
3. Combine the binary values in the order of the string "CAB":
   • 01000011 01000001 01000010.

Thus, the correct answer is (a) 01000011 01000001 01000010.

Unicode supports over a million characters, far more than ASCII, EBCDIC, or BCD.

Hertz is a unit of frequency, not data storage.

255 in decimal is FF in hexadecimal (15?16 + 15?1 = 255).

Step 1: Divide the number by 16 repeatedly and record the remainders

Step 2: Convert the remainders to hexadecimal digits

• 15 in hex = F

So:

• First remainder (15) → F

• Second remainder (15) → F

Step 3: Write the hexadecimal number (read remainders from bottom to top)

255₁₀ = FF₁₆

An information system processes raw data into meaningful information using input, processing, and output components.

Data validation ensures data quality before processing. "Data processing" itself is not a validation method.

First-generation computers used vacuum tubes, second-generation used transistors, third-generation used integrated circuits, and fourth-generation used microprocessors.

Efficiency reduces resource usage, accuracy ensures error-free results, speed enables faster processing, and scalability allows growth.

Data is first inputted, validated for accuracy, processed, and then outputted as meaningful information.

Input devices send data to the computer, and processing converts raw data into meaningful information. Output devices display results, and storage devices can store data permanently.

The keyboard inputs text, the mouse points and clicks, the monitor displays output, and the system unit processes data.

Manual record-keeping does not involve ICT, whereas e-government, precision farming, and telemedicine rely heavily on ICT.