All Free Everyday Science MCQs with Answers

1881. The gas usually filled in the electric bulb is___________?

• A. Nitrogen
• B. Hydrogen
• C. Carbon dioxide
• D. Oxygen

Explanation: Traditional incandescent bulbs are filled with nitrogen or another inert gas to reduce evaporation and oxidation of the hot tungsten filament. Nitrogen is the intended answer among these choices, although argon is also widely used.

1882. Transistor is a device that convert weak signal into__________?

• A. small signal
• B. strong signal
• C. both
• D. none

Explanation: A transistor can amplify a weak electrical signal, producing a stronger version of the same signal. It can also act as a switch, but amplification is the function intended here.

1883. Which of the following invention is oldest ?

• A. Clock
• B. Microscope
• C. Barometer
• D. Cycle

Explanation: Clocks, including ancient sundials and water clocks, were developed long before the microscope, barometer, or bicycle. Thus, the clock is the oldest listed invention.

1884. Substance whose atoms can be split are known as __________ materials.

• A. Fusionable
• B. Fissionable
• C. Combustible
• D. None of these

Explanation: Fissionable materials contain atoms whose nuclei can split in a nuclear fission reaction, releasing energy and more neutrons. Combustible materials merely burn through chemical reactions.

1885. Transistors do not need a warm up period because they have no ?

• A. Plate
• B. Grid
• C. Filament
• D. None of above

Explanation: Unlike vacuum tubes, transistors have no heated filament or cathode that must reach operating temperature. Their semiconductor action begins without a warm-up period.

1886. What is the name of the gas used in an air conditioner?

• A. Ammonia
• B. Nitrous oxide
• C. Freon
• D. CO2Educational Resources

Explanation: Freon was a common name for chlorofluorocarbon refrigerants used in air conditioners. Many Freons were phased out because they damage the ozone layer, but the historical MCQ answer remains Freon.

1887. Fan was invented by___________?

• A. Arthur Schimit
• B. Alfered Nobel
• C. Skaats Wheeler
• D. None of these

Explanation: The electric fan is credited to Schuyler Skaats Wheeler, who developed an early electric fan in the 1880s. Option c contains his name with a spelling error but clearly identifies him.

1888. Who invented steamboat?

• A. James Watt
• B. Robert Fluton
• C. Frank Whittle
• D. George Stephenson

Explanation: Robert Fulton developed the commercially successful steamboat Clermont in 1807. James Watt improved the steam engine, but he did not invent the steamboat.

1889. Chronometer is invented by________?

• A. Robert Fulton
• B. Nikola Tesla
• C. Martin Cooper
• D. John Harrison

Explanation: John Harrison developed the marine chronometer in the 18th century, solving the problem of determining longitude at sea. The other names are associated with inventions such as the steamboat, electrical systems and the mobile phone.

1890. Black gold is an oil; Black diamond is_________?

• A. Copper
• B. Iron
• C. Coal
• D. Wood

Explanation: Coal is called black diamond because of its black appearance and high economic value as a fuel. Oil is similarly called black gold because it is commercially valuable.