All Free Everyday Science MCQs with Answers

671. As we go higher into the atmosphere, the air becomes?

• A. Thinner
• B. Denser
• C. Warmer
• D. Visible

Explanation: Air pressure and density decrease with altitude because there is less overlying air pressing down. This makes high-altitude air thinner, not denser or visibly different.

672. Which metal pollute the air of a big city?

• A. Copper
• B. Chromium
• C. Lead
• D. Cadmium

Explanation: Lead pollution in cities has historically come mainly from vehicle exhaust using leaded petrol, as well as industrial emissions and dust. Lead is toxic and can damage the nervous system, especially in children.

673. Which of the gas is not known as green house gas?

• A. Methane
• B. Nitrous oxide
• C. Carbon dioxide
• D. Hydrogen

Explanation: Methane, nitrous oxide and carbon dioxide absorb outgoing infrared radiation and are greenhouse gases. Hydrogen is not normally classified as a primary greenhouse gas in basic atmospheric science.

674. Weather and climate are driven by what source(s) of energy ?

• A. Earth's internal heat
• B. Solar radiation
• C. Gravity
• D. Both (a) and (c)

Explanation: Solar radiation supplies almost all the energy driving weather and climate by heating Earth's surface and atmosphere unevenly. Earth's internal heat and gravity influence some processes but are not the main energy source.

675. Volcanoes can also be caused by _____ so called 'hot spots'.

• A. Ash
• B. Gases
• C. Mantle Plumes
• D. None of these

Explanation: Mantle plumes are columns of unusually hot, rising mantle material that can melt through the crust and produce volcanoes away from plate boundaries. These volcanic regions are called hotspots.

676. Volcanoes are usually located on ________?

• A. Divergent plate boundaries
• B. Convergent plate boundaries
• C. Hotspots
• D. All of these

Explanation: Volcanoes occur at divergent boundaries, convergent boundaries, and mantle hotspots. Therefore, all the listed locations can commonly host volcanoes.

677. Which ocean does not commonly experience tropical cyclones ?

• A. Western Pacific
• B. North Atlantic
• C. South Atlantic
• D. Indian Ocean

Explanation: The South Atlantic rarely experiences tropical cyclones because sea-surface temperatures are generally too cool and strong vertical wind shear disrupts their formation. The other listed oceans commonly produce such storms.

678. Study of fruit is called ___________?

• A. Pomology
• B. Plriculture
• C. Sericulture
• D. Apiculture

Explanation: Pomology is the branch of horticulture concerned with fruit and fruit cultivation. Sericulture concerns silkworms, while apiculture concerns honeybees.

679. The Aurora Borealis, also known as ________?

• A. Western lights
• B. Southern lights
• C. Eastern lights
• D. Northern lights Science

Explanation: Aurora Borealis is the northern lights, caused when charged particles from the Sun interact with gases in Earth’s upper atmosphere near the magnetic poles. The corresponding southern display is Aurora Australis.

680. Main constituent in air is ___________?

• A. Oxygen
• B. Nitrogen
• C. Hydrogen
• D. Helium

Explanation: Nitrogen makes up about 78% of dry air, making it the main constituent. Oxygen is second at about 21%, while hydrogen and helium occur only in trace amounts.