Question 1

How does a light bulb work?

Accepted Answer

A light bulb works by passing electricity through a tiny wire inside called a filament. When the electricity flows through this wire, it gets very hot and glows, which gives off light.

Question 2

Why do planes fly?

Accepted Answer

Planes fly because of their wing shape, which makes air move faster over the top than under the bottom. This creates a lift that pushes the plane upwards into the sky.

Question 3

How do refrigerators keep food cold?

Accepted Answer

Refrigerators keep food cold by using a gas that turns into a liquid and back into a gas. This process absorbs heat from inside the fridge, making it cool and keeping the food fresh.

Question 4

What makes computers work so fast?

Accepted Answer

Computers work fast because they have a tiny electric brain called a microchip. This chip can do lots of calculations very quickly, helping the computer perform tasks in seconds.

Question 5

How does a microwave heat food?

Accepted Answer

A microwave heats food by using invisible waves called microwaves. These waves make water molecules in the food move around quickly, which heats it up.

Question 6

Why do cars need fuel?

Accepted Answer

Cars need fuel because it gives them the energy to move. The engine burns the fuel, which creates power to turn the wheels and make the car drive.

Question 7

How do batteries work?

Accepted Answer

Batteries work by storing energy in special chemicals inside them. When you connect the battery to something, the chemicals create electricity that powers the device.

Question 8

Why does a compass always point north?

Accepted Answer

A compass points north because the Earth itself is like a giant magnet. The needle in the compass is a small magnet, and it lines up with the Earth's magnetic field, pointing north.

Question 9

How do trains stay on the tracks?

Accepted Answer

Trains stay on tracks because of the shape of their wheels. The wheels fit perfectly on the tracks, and are guided by the tracks, so the train doesn't fall off.

Question 10

Why do glasses help us see better?

Accepted Answer

Glasses help us see better because they bend light in the right way to focus it on our eyes correctly. This helps us see clearly, whether things are far away or close up.

Question 11

How do electric fans cool us down?

Accepted Answer

Electric fans cool us down by blowing air across our skin. This moving air helps our sweat evaporate faster, cooling us off in the process.

Question 12

Why do some clocks have a tick-tock sound?

Accepted Answer

Some clocks make a tick-tock sound because of the swinging pendulum inside. The movement of the pendulum back and forth controls the clock's gears and makes the sound.

Question 13

How do elevators go up and down?

Accepted Answer

Elevators go up and down using strong cables and a motor. The motor moves the cables, which pulls the elevator car to different floors.

Question 14

What makes televisions show pictures?

Accepted Answer

Televisions show pictures by using tiny colored lights called pixels. These lights turn on and off very quickly to form the images we see on the screen.

Question 15

Why do we wear helmets when riding bikes?

Accepted Answer

We wear helmets to protect our heads in case we fall or bump into something. Helmets absorb the impact, keeping our skull safe from injury.

Question 16

How does a camera take pictures?

Accepted Answer

A camera takes pictures by capturing light through a lens. The light hits a sensor which records the image, and then it is saved as a photo.

Question 17

How does a doorbell work?

Accepted Answer

A doorbell works by sending an electrical signal when you press the button. This signal goes to the bell, making it ring to let people know you're at the door.

Question 18

What makes magnets stick to the fridge?

Accepted Answer

Magnets stick to the fridge because the fridge is made of metal and magnets are attracted to metal. The pull between the magnet and metal makes them stick together.

Question 19

Why do we need zippers on clothes?

Accepted Answer

Zippers help close our clothes quickly and keep them in place. We can easily move a zipper up or down to open or close clothing without using buttons.

Question 20

How does a washing machine clean clothes?

Accepted Answer

A washing machine cleans clothes by spinning them around in water mixed with soap. The spinning action and soapy water work together to remove dirt and stains.

The Science Behind Everyday Inventions - 20 FAQs Explained Simply