All Free Everyday Science MCQs with Answers

1841. In radio, what does the FM stands for?

• A. Frequency modulation
• B. Frequency meter
• C. Fiber modulation
• D. Frequency Magnet

Explanation: FM means frequency modulation, in which information is carried by varying the frequency of a radio wave. AM, by contrast, varies the wave’s amplitude.

1842. The term 'white coal' is sometimes referred to which of the following?

• A. Geothermal energy
• B. Wind energy
• C. Hydroelectricity
• D. Biomass energy

Explanation: Hydroelectricity is generated by flowing or falling water, so it is often called white coal because water power replaces the role of coal in producing electricity. The term does not refer to geothermal or wind energy.

1843. The chief constituents of gobar gas is_________?

• A. Methane
• B. Oxygen
• C. Hydrogen
• D. Carbon monoxide

Explanation: Gobar gas, or biogas produced from animal dung, is mainly methane, which burns as its fuel component. It also contains carbon dioxide and small amounts of other gases, but not oxygen as its chief constituent.

1844. What is 'Tokamak' ?

• A. An Israeli radar system
• B. An American anti-missile system
• C. A defence collaboration between Japan and South Korea
• D. A device used in nuclear-fusion research for magnetic confinement of plasma

Explanation: A tokamak is a doughnut-shaped device that uses magnetic fields to confine extremely hot plasma for nuclear-fusion research. Magnetic confinement prevents the plasma from directly touching the vessel walls.

1845. The audio signals of TV are _____________?

• A. Amplitude modulated
• B. Frequency modulated
• C. fixe modulated
• D. Velocity modulated

Explanation: Television sound is commonly transmitted by frequency modulation, which resists many amplitude-noise disturbances. Television pictures are generally amplitude-modulated, creating the common trap.

1846. Which among the following waves is used for communication by artificial satellites ?

• A. Micro waves
• B. Radio waves
• C. A. M.
• D. Infra-red waves

Explanation: Artificial satellites commonly use microwaves because they have short wavelengths, carry large amounts of information, and pass through the atmosphere with relatively little absorption. They are a high-frequency portion of the radio-wave spectrum.

1847. Kilowatt-hour is a unit of____________?

• A. Power
• B. Electric Current
• C. Energy
• D. Time
• E. None of these

Explanation: A kilowatt-hour is power multiplied by time, so it measures electrical energy consumed. It is not a unit of power, which is measured in watts or kilowatts.

1848. Which of the following is mainly used for light patrol engines ?

• A. Kerosene oil
• B. Paraffin oil
• C. Heavy Fuel oil
• D. Gasoline

Explanation: Light petrol engines use gasoline, a volatile liquid fuel that ignites readily in spark-ignition engines. Heavy fuel oil is intended for large, slow-speed engines rather than light engines.

1849. Which one of the following elements the drum of a Photostat machine is made up of: _________?

• A. Aluminium
• B. Selenium
• C. Barium
• D. None of these

Explanation: Photostat and photocopier drums traditionally use selenium because it is a photoconductor: its electrical conductivity changes when light falls on it. This property allows the image to be formed electrostatically.

1850. Biggest award in the field of science is the __________?

• A. Noble Prize
• B. UNESCO peace prize
• C. Right livelihood prize
• D. All of these

Explanation: The Nobel Prize is widely regarded as the highest-profile international award for major scientific achievements. “Noble Prize” is a common misspelling of Nobel Prize.