Why Does It Happen? Trivia Quiz

Answer: Due to gravity

Gravity is the force that pulls everything on Earth towards its center. This force binds everything to the Earth; even the Earth's atmosphere. So no matter how hard you try to jump, you will always return to the ground.

Answer: False

Rain drops are circular in shape due to surface tension and not due to air resistance. Surface tension is a force generated by the molecules inside a drop to keep themselves together and maintain the least surface area. But if you look at a raindrop it will look elongated due to gravity.

Answer: It has been turned into kinetic energy

When we run, we use energy produced by our body to move our legs - this movement is kinetic energy. As we speed up, our kinetic energy increases. This increase comes from our body. Hence we start losing energy and feel tired. Later when we stop, this kinetic energy changes into heat which we feel when we have been exercising.

Answer: Helium is less dense than air

Helium is a very light gas. It is even less dense than air and we know that things which are lighter float in a denser medium. So a balloon filled with helium will rise in air.

Answer: The Sun is closer to us than other stars

The Sun appears brightest in the sky from Earth because it is closer to Earth than other stars. There are many stars which are brighter than our Sun but they are very, very far away from us so they seem less bright compared to the Sun. Our Sun is just a medium sized star in the whole galaxy.

Answer: True

When a thunderstorm happens, light always reaches us before we even hear thunder because light is much faster than sound. In air, sound travels with the speed of around 330 m/s but light travels with speed of 3*10^8 m/s. So light is 1,000,000 times faster than sound.

Answer: Because of low friction

Friction is a force which occurs when two surfaces are in contact with each other. It opposes the motion of a body. So the higher the friction, the easier is is to walk on a surface. If something is smooth, it means it has very little friction with things that come into contact with it.

Answer: True

This is an example of Newton's third law of motion. This law states that every action has an equal and opposite reaction and reaction happens always in opposite direction of force applied.

Answer: The water on the ground evaporates more quickly

When you drop water on the floor, the surface area of water increases, so water gets more area to evaporate hence it evaporates more quickly than the water in the glass and so disappears from sight faster.

Answer: Due to the presence of chlorophyll in them

Chlorophyll is a pigment found in leaves of plants. This pigment gives a green color to leaves. Chlorophyll helps plants to capture sunlight and use it to make their food.