Understanding Sources of Heat

What are the sources of heat mentioned?

• Sun, Combustion, Friction, and Electricity

• Ice, Wind, Rain, and Clouds

• Water, Air, Soil, and Plants

• Mountains, Rivers, Lakes, and Oceans

How does the sun contribute to heat on Earth?

• By reflecting light from the moon

• By providing a magnetic field

• By giving us light and heat

• By moving clouds in the sky

What happens when we stand under the sun for too long?

• We feel very cold

• We start to float

• We become invisible

• We feel very hot

Why is it difficult to walk barefoot on a sunny afternoon?

• Because the ground is too cold

• Because the ground is slippery

• Because the ground is wet

• Because the ground is too hot

What is needed to generate heat through combustion?

• Mixing water and oil

• Freezing substances

• Burning fuels like wood and petrol

• Using batteries

What fuels are used in combustion to generate heat?

• Electricity, Batteries, Solar power

• Water, Air, Sunlight

• Wood, Kerosene, Coal, Petrol

• Sand, Rocks, Clay, Gravel

How was fire made in the past using friction?

• By striking flint and steel

• By blowing air on dry leaves

• By rubbing two stones together

• By shaking trees

What is the result of rubbing two surfaces together?

• It generates heat

• It makes sound

• It creates light

• It produces water

Which appliances use electricity to generate heat?

• Television, Radio, Lamp, and Computer

• Iron box, Water heater, Electric kettle

• Fan, Air conditioner, Electric car

• Solar panel, Wind turbine, Hydroelectric dam

What principle does an electric kettle work on?

• Solar energy absorption

• Mechanical energy conversion

• Heat generation through electricity

• Magnetic induction