All Free Everyday Science MCQs with Answers

1591. Lux is a unit of __________?

• A. Luminous Flux
• B. Illumination
• C. Luminous Intensity
• D. Focus

Explanation: Lux measures illuminance, meaning the luminous flux falling on each square metre of a surface. Luminous flux is measured in lumens, while luminous intensity is measured in candelas.

1592. The antiparticle of an electronic is _______?

• A. Positron
• B. Proton
• C. Alpha particular
• D. None of theseVitamins & Supplements

Explanation: The positron is the electron’s antiparticle: it has the same mass as an electron but a positive charge. A proton is a different, much more massive particle.

1593. Dyne is the unit of?

• A. Force
• B. Pressure
• C. Velocity
• D. Momentum

Explanation: The dyne is the centimetre-gram-second unit of force, equal to the force that gives a 1-gram mass an acceleration of 1 centimetre per second squared. Pressure, velocity and momentum have different units.

1594. Which instrument is used to measuring height above sea leve?

• A. Hygrometer
• B. Hypsometer
• C. Pyrometer
• D. Solometer

Explanation: A hypsometer determines elevation or height above sea level, traditionally from the boiling point of water, which changes with atmospheric pressure. A hygrometer measures humidity and a pyrometer measures high temperature.

1595. Name the famous Pakistani scientist who worked under the supervision of Albert Einstein?

• A. Dr Abdul Qadeer
• B. Riazuddin Siddiqui
• C. Ammar Muhammadi
• D. Dr Abdul Salam

Explanation: Riazuddin Siddiqui was a Pakistani mathematician who worked under Albert Einstein. Abdul Salam was also a renowned Pakistani scientist, but this particular association belongs to Siddiqui.

1596. Dioptre is used to measure?

• A. optical power
• B. luminous intensity
• C. power
• D. distance of heavenly bodies

Explanation: A dioptre is the unit of optical power and equals the reciprocal of focal length in metres. It is used for lenses, such as eyeglass lenses, rather than for ordinary mechanical power or distance.

1597. Uncertainty Principle was given by?

• A. Werner Heisenberg
• B. Farady
• C. John locke
• D. None of these

Explanation: Werner Heisenberg proposed the uncertainty principle, which states that certain pairs such as a particle’s position and momentum cannot both be known with unlimited precision. Faraday is associated with electromagnetic induction, not this principle.

1598. The most suitable thermometer for measuring boiling point of water is ?

• A. Mercury Thermometer
• B. Liquid crystal thermometer
• C. Bimetallic thermometer
• D. Alcohol thermometer

Explanation: A mercury thermometer is suitable for measuring water’s boiling point because mercury remains liquid well above 100°C and expands predictably. Alcohol boils near 78°C, so it cannot reliably measure the boiling point of water.

1599. One mega ohm resistance is equal to ______?

• A. 106 ohm
• B. 108 ohm
• C. 107 ohm
• D. 10-6 ohm

Explanation: The prefix mega means one million, so 1 megaohm equals 1,000,000 ohms, or 10⁶ ohms. The other powers either represent different resistance values or a very small fraction of an ohm.

1600. Energy possessed by water in a dam is ?

• A. Electrical energy
• B. Mechanical energy
• C. Kinetic energy
• D. Potential energy

Explanation: Water stored at height in a dam possesses gravitational potential energy because of its position. When released, this energy changes into kinetic energy and then helps generate electricity.