Tag: science & technology

Quizzes (551) Questions (11015)

Questions Related to science & technology

Multiple choice general knowledge science & technology

Which of the statements is NOT correct?

  1. The velocity of sound in air increases with the increase of temperature

  2. The velocity of sound in air is independent of pressure

  3. The velocity of sound in air decreased as humidity increases

  4. The velocity of sound in air is not affected by the change in amplitude and frequency
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sound actually travels FASTER in humid air because water vapor is less dense than dry air (the molecular weight of H₂O is 18 vs N₂=28, O₂=32). Lower density means faster sound propagation, making statement C the incorrect one.

Multiple choice general knowledge science & technology

Which one of the following is a vector?

  1. Kinetic energy

  2. Pressure

  3. Rate of change of momentum

  4. Density
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The rate of change of momentum is force (F = dp/dt), and force is a vector quantity having both magnitude and direction. Kinetic energy, pressure, and density are all scalar quantities with only magnitude, no direction.

Multiple choice general knowledge science & technology

A falling drop of rain water acquires the spherical shape due to

  1. Surface Tension

  2. Gravitational force

  3. Atmospheric pressure

  4. Viscosity
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Surface tension minimizes surface area for a given volume, causing falling raindrops to become spherical. Gravity would elongate the drop, atmospheric pressure compresses uniformly, and viscosity resists motion but doesn't determine shape.

Multiple choice general knowledge science & technology

To rename object

  1. F1

  2. F2

  3. F3

  4. F4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In Windows Explorer and most file management systems, F2 is the standard keyboard shortcut to rename a selected file or folder. F1 typically opens Help, F3 is for Search, and F4 has various uses depending on context (often address bar in Explorer). This is a basic computer operation that every user should know.

Multiple choice general knowledge science & technology

open the properties of selected object

  1. ALT+SHIFT

  2. CTRL+SHIFT

  3. ALT+ENTER

  4. CTRL+ENTER
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

ALT+ENTER is the standard keyboard shortcut to open the Properties dialog for a selected file or folder in Windows Explorer. ALT+SHIFT and CTRL+SHIFT are used for various other functions but not properties. CTRL+ENTER is typically used for 'Open' or in browsers for auto-complete URLs. This is a fundamental Windows keyboard shortcut.

Multiple choice general knowledge science & technology

Find all files

  1. F3

  2. F1

  3. F9

  4. F8
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

F3 is the standard keyboard shortcut to open the Search/Find dialog in Windows Explorer and most file managers. F1 opens Help, F9/F8 have various uses depending on context (F9 refreshes in some applications). The Find Files function is essential for locating documents and is tested in basic computer literacy exams.

Multiple choice general knowledge science & technology

BACKSPACE does

  1. delete the current folder

  2. rename the current folder

  3. delete all sub folders

  4. switch to parent folder
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In Windows Explorer and file managers, BACKSPACE is the keyboard shortcut to navigate to the parent directory (switch to parent folder). This is a standard navigation method - pressing BACKSPACE moves you up one level in the folder hierarchy. It does not delete folders, rename folders, or delete subfolders. DELETE is used for deletion, and F2 for renaming.

Multiple choice general knowledge science & technology

CTRL+Z

  1. Undo

  2. Copy

  3. Move

  4. Delete
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

CTRL+Z is the universal keyboard shortcut for Undo across Windows and most applications. It reverses the last action. Other options are different operations: CTRL+C is Copy, CTRL+X is Cut (for Move), and DELETE is for deletion. Undo is one of the most fundamental shortcuts that every computer user must know for correcting mistakes.