Understanding Heat and Its Effects

What happens to the temperature of an object when it is heated?

• It remains the same.

• It decreases.

• It increases.

• It fluctuates randomly.

Which of the following is an example of thermal expansion in daily life?

• Melting of ice

• Fitting iron rims on wooden wheels

• Boiling of water

• Condensation of steam

What is the boiling point of water?

• 0 degrees Celsius

• 200 degrees Celsius

• 100 degrees Celsius

• 50 degrees Celsius

In which state of matter does conduction primarily occur?

• Solid

• Liquid

• Gas

• Plasma

What is necessary for conduction to occur between two objects?

• They must be in motion.

• They must be separated by a vacuum.

• They must be in contact and have the same temperature.

• They must be in contact and have different temperatures.

What is the primary mode of heat transfer in fluids?

• Conduction

• Convection

• Radiation

• Reflection

What is a convection current?

• A movement of solid particles in a fluid

• A flow of electricity in a circuit

• A movement of air carrying heat from warmer to cooler areas

• A flow of water from high to low pressure

How does radiation differ from conduction and convection?

• It only occurs in liquids.

• It only occurs in solids.

• It does not require a medium to transfer heat.

• It requires a medium to transfer heat.

Why is a cloudy night warmer than a clear night?

• Clouds prevent heat from escaping the earth.

• Clouds absorb more heat from the sun.

• Clouds generate their own heat.

• Clouds reflect thermal radiation back to the earth.

What causes a sea breeze during the day?

• Land cooling faster than the sea

• Sea cooling faster than the land

• Land heating faster than the sea

• Sea heating faster than the land