What is the function of the Ctrl + C shortcut key?
Correct answer is: B. Copy
Ctrl + C copies the selected item to the clipboard.
Which of the following is an open-source operating system?
Correct answer is: C. Linux
Linux distributions are open-source operating systems.
Which is the most commonly used search engine?
Correct answer is: C. Google
Google is the most widely used web search engine globally.
What is the shortcut key to insert a hyperlink in many editors (e.g., Word, web editors)?
Correct answer is: C. Ctrl+K
Ctrl + K is the common shortcut to insert/edit hyperlinks in many apps/editors.
What is the smallest unit of memory in a computer?
Correct answer is: A. Bit
A bit (binary digit: 0 or 1) is the smallest unit of data in computing.
Which of the following is a popular cloud storage service?
Correct answer is: B. Dropbox
Dropbox (and Google Drive, OneDrive etc.) are popular cloud storage services (Dropbox is a classic example).
If X = 80% of Y and Z = 120% of X, the ratio X : Y : Z is:
Correct answer is: C. 20:25:24
Given X = 0.8Y and Z = 1.2X ⇒ X:Y:Z = 0.8Y:Y:0.96Y ⇒ multiply by 25 ⇒ 20:25:24 (solution shown in your notes).
A number multiplied by 3/4 of itself gives 10800. The number is:
Correct answer is: B. 120
Let number = x → x*(3/4)x = 10800 ⇒ (3/4)x² =10800 ⇒ x² =14400 ⇒ x = 120.
A cube has edge 18 cm. How many smaller cubes of edge 3 cm can be cut from it?
Correct answer is: A. 216
Each side: 18/3 = 6 small cubes per edge → total = 6³ = 216.
What is the complete square (perfect square form) of x² + 18x + 81?
Correct answer is: B. (x+9)²
x² + 18x + 81 = (x + 9)² (since 2*9 = 18 and 9² = 81).