Question 1

How does a microwave heat food?

Accepted Answer

A microwave heats food by using waves called microwaves. These waves make water molecules in the food move around really fast, which creates heat and warms the food.

Question 2

Why do light bulbs light up?

Accepted Answer

A light bulb lights up because electricity flows through a tiny wire inside it. This makes the wire very hot, and it glows to give off light.

Question 3

How does a refrigerator keep food cold?

Accepted Answer

A refrigerator keeps food cold using a special liquid that changes to gas and back to liquid. This process takes heat away from the inside of the fridge, making it cool.

Question 4

How does a TV show pictures?

Accepted Answer

A TV shows pictures by turning tiny dots on the screen on and off really fast. By changing the colors and brightness of these dots, it creates moving images we can watch.

Question 5

Why do cell phones need batteries?

Accepted Answer

Cell phones need batteries because they store energy that powers the phone. Without a battery, a phone wouldn’t have the energy it needs to work.

Question 6

How does a fan keep us cool?

Accepted Answer

A fan keeps us cool by moving air around. When air moves, it helps sweat on our skin dry faster, which makes us feel cooler.

Question 7

How do headphones make sound?

Accepted Answer

Headphones make sound by using small speakers that vibrate to create sound waves. These sound waves travel to our ears so we can hear music or voices.

Question 8

Why do calculators add numbers correctly?

Accepted Answer

Calculators have tiny computers inside that can do math really fast. They follow special rules to add numbers correctly every time.

Question 9

How does a clock keep time?

Accepted Answer

A clock keeps time using gears and springs (in old clocks) or a little computer chip (in modern ones). They make sure the hands move at just the right speed to show the correct time.

Question 10

How does a camera take pictures?

Accepted Answer

A camera takes pictures by letting light in through a small hole onto a special sensor. The sensor captures the image of whatever the camera is pointed at.

Question 11

Why do remote controls work from far away?

Accepted Answer

Remote controls send invisible signals to devices like TVs using light called infrared. The device reads these signals to do things like change the channel or volume.

Question 12

How does a washing machine clean clothes?

Accepted Answer

A washing machine cleans clothes by spinning them with water and soap. This action helps scrub off dirt and stains from the fabric.

Question 13

How does a flashlight make light?

Accepted Answer

A flashlight makes light by sending electricity from batteries to a bulb or an LED. The bulb or LED glows to create light that shines out.

Question 14

Why do electric cars need charging?

Accepted Answer

Electric cars need charging because they run on electricity stored in big batteries. After driving, these batteries must be recharged to have more energy for the car.

Question 15

How does a toaster heat bread?

Accepted Answer

A toaster heats bread by sending electricity through wires that get very hot. The heat cooks the bread until it turns into toast.

Question 16

How do elevators move up and down?

Accepted Answer

Elevators move up and down using strong cables and a motor. The motor pulls the cables to lift or lower the elevator car.

Question 17

How does a printer put ink on paper?

Accepted Answer

A printer puts ink on paper by spraying tiny drops of ink from small nozzles. These droplets form letters and images as the paper moves through the printer.

Question 18

How does a vacuum cleaner pick up dirt?

Accepted Answer

A vacuum cleaner picks up dirt by creating suction with a fan inside. The suction pulls dirt and dust into the vacuum where it's collected in a bag or bin.

Question 19

Why do computers need a keyboard?

Accepted Answer

Computers need a keyboard so we can tell them what to do using letters and numbers. Each key sends a signal to the computer to type a character or perform a command.

Question 20

How does a GPS find where we are?

Accepted Answer

A GPS finds where we are by talking to satellites in space. It uses information from these satellites to pinpoint our exact location on Earth.

The Science Behind Everyday Gadgets - 20 FAQs Explained Simply