All Free Everyday Science MCQs with Answers

1731. "Beaufort Scale" is used to measure____________?

• A. Wind Velocity
• B. Air Pressure
• C. Wind Direction
• D. Humidity

Explanation: The Beaufort scale classifies wind force from observed effects and corresponds approximately to wind speed or velocity. It does not measure air pressure, humidity or the compass direction of wind.

1732. Red + Green + Blue = ________?

• A. Maroon
• B. White
• C. Black
• D. None of the above

Explanation: Red, green and blue light are additive primary colours, and combining all three at equal intensity produces white light. This differs from mixing pigments, where the result tends toward dark colours.

1733. What are the three basic units of measurement for the metric system?

• A. Metre, litre and gramme
• B. Centimetre, kilograms and metric
• C. Kilogram, mass and energy
• D. Kelvin, cd and mole

Explanation: Metre measures length, gramme measures mass, and litre measures volume in the commonly taught metric system. The other choices mix quantities or list only some SI units.

1734. What has no charge, and is one of the fundamental particles making up an atom's nucleus?

• A. Electron
• B. Neutron
• C. Proton
• D. All of Above

Explanation: A neutron has no electrical charge and is found with protons in the atomic nucleus. Electrons are negatively charged and lie outside the nucleus, while protons are positively charged.

1735. Who came up with three laws of motion?

• A. Galileo
• B. Albert Einstein
• C. Issac Newton
• D. Hubble

Explanation: Isaac Newton formulated the three laws of motion, explaining inertia, the relation between force and acceleration, and action and reaction. Galileo contributed important earlier ideas about motion but did not state these three laws.

1736. At what temperature are Celsius and Fahrenheit equal?

• A. -40 degree
• B. 40 degree
• C. -10 degree
• D. 10 degree

Explanation: The Celsius and Fahrenheit scales intersect at −40 because the conversion formula, F = 9C/5 + 32, gives the same number when C = −40. Thus −40°C equals −40°F.

1737. The lens used in a simple microscope is____________?

• A. Concave
• B. Convex
• C. Cylindrical
• D. None

Explanation: A simple microscope uses a convex lens, which converges light and forms a magnified virtual image when the object is within its focal length. A concave lens produces a diminished image.

1738. The image formed in a compound microscope is_____________?

• A. erect
• B. inverted
• C. sometimes erect, sometimes inverted
• D. none

Explanation: The objective lens first forms an inverted real image, and the eyepiece magnifies it without reversing it again. Therefore the final image in a compound microscope is inverted relative to the object.

1739. P Waves are also said to be __________ waves?

• A. Push-pull
• B. Side-side
• C. Up-down
• D. None of the above

Explanation: P waves are primary, longitudinal waves in which particles move back and forth parallel to the direction of travel, producing alternating pushes and pulls. S waves move side to side or up and down, so those are not P waves.

1740. In general, the most destructive earthquake waves are the __________ ?

• A. P waves
• B. S waves
• C. Surface waves
• D. All of the above

Explanation: Surface waves travel along the Earth's surface and usually produce the largest ground motion, making them the most destructive earthquake waves. P waves arrive first but generally cause less damage.