251 What is the chemical formula of carbon dioxide?
Explanation
Carbon dioxide consists of one carbon atom and two oxygen atoms, giving the formula CO2
Last verified on 25-09-2026
General Knowledge MCQs
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All MCQs in General Knowledge
252 Who discovered the laws of planetary motion?
Explanation
Johannes Kepler formulated the three laws of planetary motion describing the orbits of planets around the sun
Last verified on 25-09-2026
253 In a certain code, each letter of a word is moved 6 step(s) forward in the alphabet, so ‘CAT’ is written as ‘IGZ’. Using the same code, how is ‘DOG’ written?
Explanation
- Each letter shifts forward by 6 positions
- 'DOG' -> shift every letter by 6
- Result: 'JUM'
Last verified on 25-09-2026
254 In a certain code, each letter of a word is moved 3 step(s) forward in the alphabet, so ‘RUG’ is written as ‘UXJ’. Using the same code, how is ‘TAP’ written?
Explanation
- Each letter shifts forward by 3 positions
- 'TAP' -> shift every letter by 3
- Result: 'WDS'
Last verified on 25-09-2026
255 In which medium does sound travel the fastest?
Explanation
Sound travels fastest through solids because their particles are closely packed, allowing faster transmission of vibrations
Last verified on 25-09-2026
256 Who is often referred to as the ‘father of computers’?
Explanation
Charles Babbage designed the Analytical Engine, a mechanical general-purpose computer, earning him the title 'father of the computer'
Last verified on 25-09-2026
257 In a certain code, each letter of a word is moved 2 step(s) forward in the alphabet, so ‘DOG’ is written as ‘FQI’. Using the same code, how is ‘CAT’ written?
Explanation
- Each letter shifts forward by 2 positions
- 'CAT' -> shift every letter by 2
- Result: 'ECV'
Last verified on 25-09-2026
258 What type of mirror is commonly used in vehicle side mirrors for a wider field of view?
Explanation
Convex mirrors are used in vehicle side mirrors because they provide a wider field of view, though images appear smaller
Last verified on 25-09-2026
259 Who is credited with achieving the first successful powered airplane flight?
Explanation
Orville and Wilbur Wright (the Wright Brothers) achieved the first successful powered, controlled airplane flight in 1903
Last verified on 25-09-2026
260 In a certain code, each letter of a word is moved 6 step(s) forward in the alphabet, so ‘SUN’ is written as ‘YAT’. Using the same code, how is ‘BUS’ written?
Explanation
- Each letter shifts forward by 6 positions
- 'BUS' -> shift every letter by 6
- Result: 'HAY'
Last verified on 25-09-2026