Tag: science & technology

Quizzes (551) Questions (11015)

Questions Related to science & technology

Multiple choice general knowledge science & technology

The Chemical Formula of Laughing Gas is:

  1. NO2

  2. NO3

  3. N2O3

  4. N2O
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nitrous oxide (N2O), commonly known as laughing gas, is a colorless, sweet-tasting gas used as an anesthetic and analgesic in dentistry and medicine. It was discovered in 1772 by Joseph Priestley and named 'laughing gas' due to the euphoric effects it produces when inhaled.

Multiple choice general knowledge science & technology

It is easier to roll a stone up a sloping road than to lift it vertical upwards because

  1. work done in rolling is more than in lifting

  2. work done in lifting the stone is much more than rolling it

  3. work done in both is same but the rate of doing work is less in rolling

  4. work done in rolling a stone is less than in lifting it
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Work = force × distance. When rolling up a slope, the effective force needed is reduced (mg sinθ vs mg for vertical lift), so less work is done over the longer distance along the slope compared to lifting vertically.

Multiple choice general knowledge science & technology

The absorption of ink by blotting paper involves

  1. viscosity of ink

  2. capillary action phenomenon

  3. diffusion of ink through the blotting

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

Blotting paper has numerous tiny pores. Ink rises through these narrow channels due to capillary action - the phenomenon where liquid flows in narrow spaces without external forces, caused by surface tension and adhesive forces.

Multiple choice general knowledge science & technology

Light year is a unit of

  1. time

  2. distance

  3. light

  4. intensity of light
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A light year is the distance light travels in one vacuum year - approximately 9.46 trillion kilometers. It measures distance, not time (despite the word 'year'). Options A, C, and D are incorrect.

Multiple choice general knowledge science & technology

Mirage is due to

  1. unequal heating of different parts of the atmosphere

  2. magnetic disturbances in the atmosphere

  3. depletion of ozone layer in the atmosphere

  4. equal heating of different parts of the atmosphere
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mirage is an optical illusion caused by atmospheric refraction - light bends when passing through air layers of different temperatures due to unequal heating. This makes distant objects appear displaced, creating the illusion of water reflections.

Multiple choice general knowledge science & technology

Stars appears to move from east to west because

  1. all stars move from east to west

  2. the earth rotates from west to east

  3. the earth rotates from east to west

  4. the background of the stars moves from west to east
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The apparent east-to-west motion of stars is caused by Earth's west-to-east rotation (counterclockwise when viewed from above the North Pole). This is the same reason the sun rises in the east and sets in the west. The stars themselves don't all move in the same direction - it's an illusion from our rotating perspective.

Multiple choice general knowledge science & technology

Pa(Pascal) is the unit for

  1. thrust

  2. pressure

  3. frequency

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

The Pascal (Pa) is the SI unit for pressure, defined as one newton per square meter (N/m²). Thrust is a force measured in newtons, frequency in hertz, and conductivity in siemens per meter.

Multiple choice general knowledge science & technology

Planets do not twinkle because

  1. they emit light of a constant intensity

  2. their distance from the earth does not change with time

  3. they are very far away from the earth resulting in decrease in intensity of light

  4. they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Planets are much closer to Earth than stars, so they appear as extended light sources rather than point sources. The greater amount of light received means minor atmospheric variations that cause twinkling in stars are not noticeable in planets. Planets don't emit constant light (they reflect sunlight), and their distance from Earth does change.