All Free Everyday Science MCQs with Answers

1831. The device used to convert Alternate Current into Direct Current is called?

• A. Anemometer
• B. Battery
• C. Galvanometer
• D. Rectifier

Explanation: A rectifier uses diodes to allow current mainly in one direction, converting alternating current into direct current. An anemometer measures wind speed and a galvanometer detects small currents.

1832. Wind energy is the __________ energy.

• A. Potential
• B. Transverse
• C. Kinetic
• D. Mechanical

Explanation: Moving air possesses kinetic energy because its energy depends on motion. Wind turbines convert this kinetic energy into mechanical rotation and then usually into electrical energy.

1833. GPS is an abbreviation for?

• A. Global Poles System
• B. Global PolySiliconium Store
• C. Global Positioning System
• D. Global Position Structure

Explanation: GPS stands for Global Positioning System. Satellites transmit timed signals that allow a receiver to calculate its position on Earth.

1834. CNG stands for?

• A. Converted Natural Gas
• B. Conduced Natural Gas
• C. Conducted Natural Gas
• D. Compressed Natural Gas

Explanation: CNG means compressed natural gas, in which natural gas is stored at high pressure for use as a fuel. The compression makes storage in vehicle cylinders practical.

1835. Which from the following is NOT a conductor?

• A. Aluminium
• B. Gold
• C. Graphite
• D. All are conductors

Explanation: Aluminium, gold and graphite can all conduct electricity, although graphite is a non-metal conductor. Therefore, none of the first three is the requested non-conductor, making “all are conductors” correct.

1836. A device which converts chemical energy into electrical energy is called __________?

• A. motor
• B. generator
• C. moving-coil meter
• D. battery

Explanation: A battery converts chemical energy into electrical energy through chemical reactions at its electrodes. A generator converts mechanical energy into electrical energy, while a motor does the reverse conversion.

1837. 'Cyborg' term mostly used in Science-fiction movies describes:

• A. A human being whose physiological functions are aided by artificial means
• B. A Bionic Human
• C. An individual with artificial parts
• D. All of Above

Explanation: A cyborg is a biological organism, usually a human, whose functions are supported or enhanced by artificial or electronic components. Thus descriptions such as bionic human and human with artificial parts are included in the broad usage of the term.

1838. What is the largest artificial object in space?

• A. ISS (International Space Station)
• B. AI powered robot
• C. Parabolic aircraft
• D. None of the above

Explanation: The International Space Station is the largest human-made structure in orbit, assembled from many pressurised modules and large solar arrays. The other listed objects are not comparable orbital structures.

1839. The two elements that are frequently used for making transistors are :

• A. Boron and aluminium
• B. Silicon and Germanium
• C. Iridium and Tungston
• D. None of these

Explanation: Silicon and germanium are semiconductors whose electrical conductivity can be controlled by doping, making them suitable for transistor construction. Boron and aluminium are commonly used as dopants, not as the main semiconductor material in this context.

1840. Lingxi-03, developed by Galaxy Space, was launched using a ___________ carrier rocket.

• A. Long March-3D
• B. Long March-2D
• C. Vertical March-3D
• D. Orbital March-2D

Explanation: Lingxi-03, a Galaxy Space satellite, was launched aboard China's Long March-2D carrier rocket. The other names are either different launch vehicles or non-standard rocket names.