All Free Everyday Science MCQs with Answers

611. The deepest place on earth is ____________?

• A. Trench
• B. Mariana Trench
• C. Mangrove
• D. Groove
• E. None of these

Explanation: The Mariana Trench in the western Pacific contains Challenger Deep, the deepest known point on Earth's ocean floor. A trench is the general landform, whereas Mariana Trench is the specific name.

612. The Continent Antarctica lies at the__________?

• A. North pole
• B. South pole
• C. middle of the earth
• D. Equator
• E. None of these

Explanation: Antarctica surrounds the geographic South Pole and is the southernmost continent. The North Pole lies in the Arctic region, which is ocean surrounded by land.

613. Animal which captures and readily kills living animals for its food is called___________?

• A. Parasite
• B. Scavenger
• C. Predator
• D. Mammal
• E. None of these

Explanation: A predator actively captures and kills living prey for food. A scavenger mainly feeds on animals that are already dead, while a parasite lives on or in a host.

614. The fruits without seed, like banana, are called_____________?

• A. Seedless fruits
• B. Parthenogenesis fruits
• C. Parthenocarpic fruits
• D. placental fruits
• E. Organic fruits

Explanation: Parthenocarpic fruits develop without fertilisation, so they normally contain no mature seeds; bananas are a common example. Parthenogenesis refers mainly to development of an embryo from an unfertilised egg, not fruit formation.

615. Oasis is associated with___________?

• A. Glaciers
• B. Desert
• C. Islands
• D. Volcanoes
• E. Fertile land

Explanation: An oasis is a fertile, watered place surrounded by desert, usually formed where groundwater reaches the surface. Its vegetation and water make settlement possible in an otherwise dry region.

616. The phenomenon of Aurora Borealis, the display of red and green lights in northern hemisphere is due to radiations from____________ ?

• A. Ionosphere
• B. Troposphere
• C. Mesosphere
• D. Stratosphere
• E. None of these

Explanation: Aurora Borealis occurs when charged particles from the Sun excite gases in the upper atmosphere, mainly the ionosphere and thermosphere. These gases emit coloured light as they return to lower energy states.

617. Ozone layer prevents ______________ radiation from entering the atmosphere?

• A. Infra-red
• B. Ultraviolet
• C. X-rays
• D. Gamma rays
• E. None of these

Explanation: Stratospheric ozone absorbs much of the Sun's harmful ultraviolet radiation, especially UV-B and UV-C. It does not primarily block infrared, X-rays or gamma rays.

618. Sedimentary rocks are__________?

• A. Porous
• B. Hard
• C. Rough
• D. Brittle
• E. Volcanic

Explanation: Sedimentary rocks form from deposited particles that become compacted and cemented, leaving pores between grains in many cases. This porosity is a common feature, although it varies with compaction and cementation.

619. Which of the following atmospheric layers help in radio communication?

• A. Exosphere
• B. Ionosphere
• C. Troposphere
• D. Stratosphere
• E. Ozone layer

Explanation: The ionosphere contains charged particles that reflect or refract certain radio waves back toward Earth. This allows radio signals to travel beyond the horizon over long distances.

620. Monsoon is caused by____________________?

• A. Seasonal reversal of winds
• B. Revolution of earth
• C. Movement of clouds
• D. Rise in temperature
• E. Rain forests

Explanation: Monsoons result from seasonal differences in heating between land and sea, which reverse the prevailing wind direction. This wind reversal produces distinct wet and dry seasons.