Tag: science & technology

Quizzes (551) Questions (11015)

Questions Related to science & technology

Multiple choice general knowledge science & technology

One of the following objectives is not achieved by the process of annealing

  1. to relieve internal stress

  2. to refine grain structure

  3. to increase the yield point

  4. to soften the metal
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Annealing relieves internal stresses, refines grain structure, and softens metal by heating and slow cooling. However, annealing DECREASES the yield point (makes material more ductile) rather than increasing it. Processes like cold working or strain hardening increase yield point, but annealing does the opposite.

Multiple choice general knowledge science & technology

In oxacetylane welding, acetylene is produced using

  1. Ca (OH)2 and CO2

  2. Ca C2 and H2O

  3. CaCO3 and H2O

  4. CH4 and H2SO4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Acetylene gas is produced by reacting calcium carbide (CaC2) with water (H2O), producing acetylene and calcium hydroxide. The chemical reaction is: CaC2 + 2H2O → C2H2 + Ca(OH)2. This is the standard industrial method for generating acetylene gas for welding.

Multiple choice general knowledge science & technology

A product layout is generally suggested for

  1. continuous type of production

  2. jobbing work

  3. batch production

  4. efficient machine utilisation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Product layout arranges machines in a sequence to support continuous, repetitive production of standardized items. This minimizes material handling and maximizes flow efficiency. Jobbing work requires process layout (flexible arrangement), batch production uses hybrid layouts, and efficient machine utilization is a benefit of product layout, not a production type.

Multiple choice general knowledge science & technology

How to Close a opened TAB?

  1. Ctrl+E

  2. Ctrl+W

  3. Ctrl+Q

  4. Ctrl+T
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ctrl+W is the universal keyboard shortcut to close the current browser tab in Chrome, Firefox, Edge, and other major browsers. Ctrl+E typically focuses the address bar, Ctrl+T opens a new tab, and Ctrl+Q often quits the entire browser application.

Multiple choice general knowledge science & technology

How to Scroll down a page?

  1. Spacebar

  2. Shift+Spacebar

  3. Ctrl+Spacebar

  4. Alt+Spacebar
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pressing the Spacebar scrolls down one page at a time in most web browsers and document readers. This is a standard accessibility feature. Shift+Spacebar scrolls back up, while Ctrl and Alt modifiers with Spacebar serve different purposes in various applications.

Multiple choice general knowledge science & technology

How to close a opened Window?

  1. Ctrl+Shift+W

  2. Ctrl+W

  3. Shift+W

  4. Alt+F3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ctrl+Shift+W closes all tabs in the current window or closes the entire browser window, depending on the browser. This differs from Ctrl+W which only closes the single current tab. The Shift modifier extends the action to all tabs.