All Free Everyday Science MCQs with Answers

871. What is the name of the central part of the earth?

• A. Mantle
• B. Core
• C. Crust
• D. None of the above

Explanation: The core is Earth's central layer, surrounding the inner core with the liquid outer core. The mantle lies outside the core, while the crust is the thin outer surface.

872. The rocks formed out of layers of sediment bonded together are known as _______________?

• A. Metamorphic rocks
• B. Sedimentary rocks
• C. Igneous rocks
• D. All of the above

Explanation: Sedimentary rocks form when layers of sediment are deposited, compacted and cemented together. Igneous rocks solidify from molten material, while metamorphic rocks are altered by heat and pressure.

873. Which one is the world's largest mangrove forest(s)?

• A. Changa Manga Forest
• B. Amazon Forest
• C. Sundarbans Forest
• D. None of the above

Explanation: The Sundarbans is the world's largest continuous mangrove forest, spread across the delta of the Ganges, Brahmaputra and Meghna rivers. Changa Manga and the Amazon are not mangrove forests of this type.

874. The point that lies directly above the source of an earthquake is known as _______________ ?

• A. Earthquake Center
• B. Epicenter
• C. Gravitational Center
• D. Geological Center

Explanation: The epicentre is the point on Earth's surface directly above the earthquake's focus, where the rupture begins underground. The focus is the actual source within Earth.

875. Which pollutant from motor car exhaust causes mental disease _____?

• A. Carbon dioxide
• B. Lead
• C. Sulpher Dioxide
• D. Mercury

Explanation: Lead particles and compounds from vehicle exhaust, especially from formerly leaded petrol, can damage the nervous system and impair mental development. Carbon dioxide is a greenhouse gas, but it is not the pollutant associated with this specific neurological effect.

876. what kind of soil is treated with gypsum to make it suitable for cropping______?

• A. Alkaline
• B. Acidic
• C. Waterlogged
• D. Soil with excessive clay content

Explanation: Gypsum supplies calcium, which replaces exchangeable sodium in alkaline or sodic soil; the displaced sodium can then be leached away. This improves soil structure and makes the land more suitable for crops.

877. There are three types of plate boundaries i.e Divergent, Convergent and____________

• A. Normal
• B. Transform
• C. Complex
• D. Plain

Explanation: Divergent boundaries move apart, convergent boundaries move together, and transform boundaries slide horizontally past one another. This third type commonly produces earthquakes without necessarily creating or destroying crust.

878. The production of rubber tree is better adopted to areas where the climate is_________

• A. Warm and humid
• B. Warm and dry
• C. Cool and moist
• D. cool and dry

Explanation: Rubber trees grow best in warm, humid tropical climates with ample rainfall. Dry conditions restrict growth and reduce latex production.

879. Gulf streams are caused by__________.

• A. Cyclones
• B. Ocean Pressure
• C. Temperature
• D. Difference in water level

Explanation: The Gulf Stream is maintained largely by pressure gradients in the ocean, together with prevailing winds, Earth's rotation, and differences in water density. Among the listed choices, ocean pressure is the closest answer.

880. The areas around the North and South poles within the Polar circles is called _____________?

• A. The Torrid Zone
• B. The Frigid Zone
• C. The Temperature Zone
• D. The Hardiness Zone

Explanation: The regions within the Arctic and Antarctic Circles are called the Frigid Zones because they receive very oblique sunlight and remain cold for much of the year. The Torrid Zone lies around the equator.