All Free Everyday Science MCQs with Answers

631. Who is considered the founder of meteorology?

• A. Aristotle
• B. Plato
• C. Einstein
• D. Newton

Explanation: Aristotle is commonly called the founder of meteorology because his work Meteorologica systematically discussed weather, winds, clouds and related atmospheric phenomena. Einstein and Newton were chiefly associated with physics, not the founding of meteorology.

632. The source of oxygen in photosynthesis is

• A. water
• B. salts
• C. minerals
• D. glucose

Explanation: The oxygen released during photosynthesis comes from the splitting of water molecules in the light-dependent reactions. Carbon dioxide supplies the carbon used to make glucose, not the released oxygen.

633. The instrument used to measure wind speed is?

• A. Anemometer
• B. Barometer
• C. Hydrometer
• D. Hygrometer

Explanation: An anemometer measures wind speed, often with rotating cups or blades. A barometer measures air pressure, while a hygrometer measures humidity.

634. The Carbon Dioxide in the atmosphere, by volume, is_______?

• A. 0.039%
• B. 3.9%
• C. 13%
• D. 30%Chemistry

Explanation: Carbon dioxide makes up about 0.04% of the atmosphere by volume, historically often quoted as 0.039%. The larger percentages listed would be far above its actual atmospheric concentration.

635. Meteorology is the study of?

• A. Seasons
• B. Atmosphere
• C. Air and sounds
• D. Winds and clouds

Explanation: Meteorology is the scientific study of the atmosphere and its short-term phenomena, including weather, winds, clouds and precipitation. Seasons are related to astronomy and climate but do not define the whole field.

636. The salinity of sea water is determined by the amount of common salt (Sodium Chloride) in __________ of sea water.

• A. 1 gram
• B. 10 grams
• C. 1 kg
• D. 10 kg

Explanation: Sea-water salinity is conventionally expressed as the mass of dissolved salts in one kilogram of seawater, commonly about 35 grams per kilogram. Strictly, salinity includes all dissolved salts, not only sodium chloride.

637. At night, Plants intake __________ and release __________?

• A. Oxygen - Carbon dioxide
• B. Carbon dioxide - Oxygen
• C. Oxygen - Carbon monoxide
• D. None of theseCarbon monoxide - Oxygen

Explanation: In darkness, photosynthesis stops but respiration continues, so plants generally take in oxygen and release carbon dioxide. During daylight, photosynthesis usually reverses the net gas exchange.

638. The most abundant element in the Earth's crust is __________?

• A. Oxygen
• B. Hydrogen
• C. Carbon Dioxide
• D. Silicon

Explanation: Oxygen is the most abundant element in Earth's crust by mass, largely because it is combined with silicon and metals in widespread rocks and minerals. Silicon is second by mass, not first.

639. Which One of the Following Is Not a Greenhouse Gas?

• A. Methane
• B. Hydrogen
• C. Nitrous oxide
• D. Ozone

Explanation: Hydrogen is not normally classified as a greenhouse gas because it does not significantly absorb outgoing infrared radiation. Methane, nitrous oxide and ozone all contribute to the greenhouse effect.

640. which type of rock is made from molten(Fire) material within the earth surface?

• A. Sedimentary rock
• B. Schist rock
• C. Igneous rock
• D. Metamorphic rock

Explanation: Igneous rocks form when molten magma or lava cools and solidifies. Sedimentary rocks form from deposited material, while metamorphic rocks are altered by heat and pressure without melting.