Tag: science & technology

Quizzes (551) Questions (11015)

Questions Related to science & technology

Multiple choice general knowledge science & technology

Lead is one of the two most toxic chemicals used in petrol that cause brain damage and leukemia. Which is the other?

  1. Sulphur

  2. Benzene

  3. Nitrogen Oxide

  4. SPM or Suspended Particulate Matter
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Benzene is the correct answer. Along with lead, benzene was historically used in petrol and is a known carcinogen that causes leukemia and other blood disorders. Benzene is an aromatic hydrocarbon added to increase octane rating. Sulphur and nitrogen oxides are pollutants but not used intentionally as additives.

Multiple choice general knowledge science & technology

Name the revolution that was responsible for the beginning of large scale use of coal.

  1. The French Revolution

  2. The Industrial Revolution

  3. The American Revolution

  4. The Cultural Revolution
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Industrial Revolution (late 18th to early 19th century) marked the beginning of large-scale coal usage for steam engines, manufacturing, and transportation. Coal became the primary fuel source powering factories, railways, and ships during this period of technological transformation.

Multiple choice general knowledge science & technology

There are three different types of coal. Two of them release a great deal of pollutants into the air whereas the third releases less smoke and is considered to be less polluting. Name this type.

  1. Lignite

  2. Bituminous

  3. Anthracite

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Anthracite is the correct answer. It is the highest grade coal with 86-97% carbon content, burns hottest with minimal smoke and pollutants, and is considered cleanest. Lignite is lowest grade (25-35% carbon), very polluting. Bituminous is intermediate grade (45-86% carbon) with significant smoke and pollutants.

Multiple choice general knowledge science & technology

Of the following burning fossil fuels, which is considered to be the cleanest?

  1. Coal

  2. Natural Gas

  3. Oil

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Natural gas is the cleanest fossil fuel when burned. It produces primarily CO2 and water vapor with minimal pollutants like SO2, particulates, and mercury compared to coal and oil. Its high hydrogen-to-carbon ratio means more energy per unit of carbon emitted.

Multiple choice general knowledge science & technology

The main purpose of a refinery is to

  1. Make petrol

  2. Make different crude oils

  3. Turn crude oil in to useful things

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

The main purpose of a refinery is to convert crude oil into useful products. Crude oil itself is not directly usable - refineries separate and process it into petrol, diesel, jet fuel, lubricants, plastics, chemicals, and other products through distillation and chemical processes.

Multiple choice general knowledge science & technology

Crude oil is made of

  1. Black stuff

  2. Hydrogen and carbon

  3. Hydrocarbons and impurities

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Crude oil is primarily composed of hydrocarbons (mixtures of hydrogen and carbon molecules) plus impurities like sulfur, nitrogen, oxygen compounds, and metals. The hydrocarbons range from light gases to heavy tars, which refineries separate into different products.

Multiple choice general knowledge science & technology

Which among the following is most energy efficient?

  1. Incandescent bulb

  2. Fluorescent tube light

  3. Compact fluorescent lamp

  4. non of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Compact fluorescent lamps (CFLs) are significantly more energy efficient than incandescent bulbs, converting more electrical energy into visible light rather than heat. They typically use 60-80% less energy than incandescent bulbs while producing the same luminous output. Fluorescent tube lights are more efficient than incandescent but less efficient than CFLs due to their larger ballast requirements.

Multiple choice general knowledge science & technology

Solar cells are simple photovoltaic devices that convert solar energy directly into electricity and are manufactured from the second-most abundant element in the earth’s crust. Name it.

  1. Bauxite

  2. Silicon

  3. Calcium

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Silicon is the second most abundant element in Earth's crust (about 28% by mass) after oxygen. It is the primary material used in manufacturing photovoltaic solar cells due to its semiconductor properties and abundance. Bauxite is an aluminum ore, calcium is a reactive metal, and neither is used as the primary material in standard solar cells.