Tag: science & technology

Quizzes (551) Questions (11015)

Questions Related to science & technology

Multiple choice general knowledge science & technology

Radiocarbon is produced in the atmosphere as a result of

  1. collision between fast neutrons and nitrogen nuclei present in the atmosphere

  2. action of ultraviolet light from the sun on atmospheric oxygen

  3. action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere

  4. lightning discharge in atmosphere
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbon-14 (radiocarbon) forms when cosmic ray neutrons collide with nitrogen-14 atoms in the upper atmosphere, transmuting them into radioactive carbon-14. This continuous production maintains the steady-state concentration of radiocarbon used in radiometric dating.

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 contains numerous tiny pores that create capillary tubes. Ink is drawn into these pores by capillary action - the combined effect of adhesive forces between ink and paper fibers and cohesive forces within the liquid itself.

Multiple choice general knowledge science & technology

Siphon will fail to work if

  1. the densities of the liquid in the two vessels are equal

  2. the level of the liquid in the two vessels are at the same height

  3. both its limbs are of unequal length

  4. the temperature of the liquids in the two vessels are the same
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A siphon operates due to the pressure difference created by a height difference between liquid levels. When both vessels have liquid at the same level, there's no gravitational pressure gradient to drive flow, causing the siphon to fail regardless of tube configuration.

Multiple choice general knowledge science & technology

Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to

  1. the heating effect of current alone

  2. hysteresis loss alone

  3. both the heating effect of current and hysteresis loss

  4. intense sunlight at noon
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Transformer heating results from copper losses (I²R heating in windings) and core losses. Hysteresis loss occurs as the core is repeatedly magnetized and demagnetized by AC. Eddy current losses also contribute but aren't listed as options.

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 year through vacuum, approximately 9.46 trillion kilometers. Despite 'year' in the name, it measures distance, not time. This unit is useful for astronomical distances due to its enormous scale.

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

Mirages occur when ground heat creates a temperature gradient in the air, with hot, less dense air near the surface and cooler air above. Light rays refract (bend) as they pass through these layers of different densities, creating distorted or displaced images of distant objects.