Energía en nuestra vida diaria

How is heat used in cooking?

• Heat is used to cook food, transforming its texture and flavor.

• Heat is used only to melt ingredients.

• Heat does not affect the texture of food.

• Heat is used only to warm food.

Answer explanation

Heat is essential in cooking as it transforms food's texture and flavor, making it palatable and safe to eat. The correct choice highlights this fundamental role of heat in the cooking process.

What type of mechanical energy do toys have?

• Nuclear energy in the form of fission.

• Mechanical energy in the form of potential and kinetic energy.

• Electrical energy in the form of current.

• Thermal energy in the form of heat.

Answer explanation

Toys possess mechanical energy, which includes potential energy (stored energy) and kinetic energy (energy of motion). This is the correct choice, as other forms like nuclear, electrical, and thermal energy do not apply to typical toys.

What chemical reactions occur in food when cooking it?

• Hydration of proteins

• Fermentation of sugars

• Chemical reactions include caramelization, denaturation of proteins, gelatinization of starches, and Maillard reaction.

• Oxidation of fats

Answer explanation

Cooking involves various chemical reactions such as caramelization, denaturation of proteins, gelatinization of starches, and the Maillard reaction, which enhance flavor and texture, making this the correct choice.

How does light help plants in photosynthesis?

• Light is used to regulate the temperature of plants.

• Light helps plants in photosynthesis by providing the energy needed to convert carbon dioxide and water into glucose and oxygen.

• Light helps plants absorb nutrients from the soil.

• Light is necessary for the growth of roots.

Answer explanation

Light is essential for photosynthesis as it provides the energy required to convert carbon dioxide and water into glucose and oxygen, which are vital for plant growth and energy.

What household appliances use electricity?

• Coffee makers, toasters, blenders

• Refrigerators, washing machines, microwaves, vacuum cleaners, irons, televisions.

• Computers, printers, phones

• Fans, heaters, dryers

Answer explanation

The correct choice includes common household appliances that use electricity, such as refrigerators, washing machines, microwaves, vacuum cleaners, irons, and televisions, all of which are essential for daily tasks.

How is sound produced in music?

• Sound is produced by the light emitted by instruments.

• Sound is created from the temperature of the environment.

• Sound in music is generated by the stillness of objects.

• Sound in music is produced by the vibration of objects that generate sound waves.

Answer explanation

Sound in music is produced by the vibration of objects, such as strings or air columns, which create sound waves. This is the fundamental principle of how musical sounds are generated, making it the correct choice.

Why is chemical energy in food important?

• Chemical energy in food has no impact on the health of organisms.

• Chemical energy in food is only useful for humans.

• Chemical energy in food is essential for the functioning and survival of organisms.

• Chemical energy in food is used exclusively for digestion.

Answer explanation

Chemical energy in food is crucial as it provides the energy necessary for all biological processes, enabling growth, reproduction, and maintenance of cellular functions in organisms, making it essential for their survival.

How do people communicate using sound?

• Using only musical instruments without voice.

• Through gestures and visual signals.

• By using written communication technology.

• Through vocal and musical sounds.

Answer explanation

People communicate using sound primarily through vocalizations and musical sounds, which convey emotions, ideas, and messages. This distinguishes it from other forms of communication like gestures or written technology.