Most Repeated GK MCQs from Past Papers MCQs with Answers & Explanations (Page 165)

Speed of light - electromagnetic waves are oscillating electric and magnetic fields that propagate through space at the constant speed of light.

Iron - hemoglobin contains iron atoms in its heme groups which bind and carry oxygen, making iron its main constituent.

Longitudinal Wave - in a longitudinal wave the medium's particles vibrate back and forth parallel to the direction the wave travels, which matches this definition.

Magnitude of earthquakes - the Richter scale is a numerical scale that quantifies the magnitude (energy release) of earthquakes.

Cornea - eye donation typically uses the donor's cornea because the clear front layer can be transplanted to restore vision.

Zero - diesel engines use compression ignition rather than spark ignition, so they do not require any spark plugs.

vitamin D - vitamin D is needed for proper calcium absorption and bone mineralization, so its deficiency impairs bone health.

Electromagnetic Waves carry radio and television signals because they propagate through space and can be modulated to transmit audio and video information.

186282 miles per second is the speed at which light travels in a vacuum, the standard value used for light's propagation in empty space.

Saturn is the second largest planet in our solar system by overall size and mass among the planets.

Stationary Wave does not transport energy along the medium; its energy oscillates locally between nodes and antinodes rather than moving from one place to another.

centipede is an arthropod characterized by having many leg-bearing body segments, which gives it a notably large number of legs.

The nervous system controls different bodily functions by sending and processing electrical signals through the brain, spinal cord, and nerves to coordinate sensation, movement, and organ activity.

Yeast produces carbon dioxide during fermentation, and the released carbon dioxide forms bubbles that make bread dough rise and become light and porous.

The Ionosphere produces the red and green lights of the Aurora Borealis when charged particles from the sun collide with and excite the ionized gases in that upper atmospheric layer.

A moderator is used in nuclear reactors to Slow down the speed of the neutrons so they are more likely to induce fission in the reactor fuel and sustain a controlled chain reaction.

The Ionosphere helps radio communication by reflecting and refracting radio waves back toward Earth, enabling signals to travel beyond the horizon for long-distance transmission.

Monsoon is caused by Seasonal reversal of winds when differential heating between land and sea changes wind direction and brings prolonged rainy and dry seasons.

Fuel used in a Fast Breeder Reactor is Uranium Plutonium Oxide, a mixed oxide fuel containing both uranium and plutonium designed to support breeding and fission reactions.

In asteroid belt between the orbits of Mars and Jupiter: most asteroids are concentrated in the main asteroid belt located between Mars and Jupiter.