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• 1.

### Rising warm air currents is an example of

• A.

• B.

Conduction

• C.

Convection

C. Convection
Explanation
Rising warm air currents are an example of convection because convection is the transfer of heat through the movement of a fluid (in this case, air). When warm air rises, it creates a convection current where the warm air moves upward and the cooler air moves downward. This movement of air helps to distribute heat throughout a space. Convection is different from radiation, which is the transfer of heat through electromagnetic waves, and conduction, which is the transfer of heat through direct contact between objects.

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• 2.

### True or False the sun DIRECTLY heats the air in our atmosphere

• A.

True

• B.

False

B. False
Explanation
The sun does not directly heat the air in our atmosphere. Instead, it heats the Earth's surface, which in turn heats the air through a process called conduction. This means that the air near the Earth's surface is warmed by contact with the heated surface, causing it to rise and create convection currents. These currents then distribute heat throughout the atmosphere. Therefore, the sun indirectly heats the air in our atmosphere through the heating of the Earth's surface.

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• 3.

### True or False higher temperature means faster moving molecules

• A.

True

• B.

False

A. True
Explanation
Higher temperature means that the average kinetic energy of the molecules in a substance is higher. As temperature increases, the molecules gain more energy and move faster. This is because temperature is a measure of the average amount of energy possessed by the molecules in a substance. Therefore, it is true that higher temperature corresponds to faster moving molecules.

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• 4.

### The reason why water boils causing the circular motion is due to?

• A.

• B.

Conduction

• C.

Convection

C. Convection
Explanation
Water boils and causes circular motion due to convection. Convection is the transfer of heat through the movement of a fluid, in this case, water. When water is heated, the molecules gain energy and move faster, becoming less dense. The less dense hot water rises to the top, while the cooler, denser water sinks to the bottom. This creates a circular motion as the hot water rises and the cool water sinks, resulting in the boiling of water.

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• 5.

### When you get into a car with hot black leather in the middle of the summer and you burn your legs, this is an example of?

• A.

• B.

Conduction

• C.

Convection

B. Conduction
Explanation
When you sit on hot black leather in a car, the heat is transferred from the leather to your legs through direct contact. This process of heat transfer is known as conduction. Conduction occurs when heat is transferred between objects that are in direct contact with each other. In this case, the hot leather and your legs are in direct contact, allowing the heat to transfer from the leather to your legs, resulting in the burning sensation.

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• 6.

### When rocks are heated by the warmth of the sun this is an example of?

• A.

• B.

Conduction

• C.

Convection

Explanation
When rocks are heated by the warmth of the sun, it is an example of radiation. Radiation is the transfer of heat through electromagnetic waves, such as the heat we feel from the sun. In this case, the rocks are absorbing the sun's energy, causing them to heat up. Conduction refers to the transfer of heat through direct contact between objects, while convection involves the movement of heat through the circulation of fluids or gases. However, in this scenario, the rocks are being heated by the sun's radiation rather than through direct contact or fluid movement.

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• 7.

### When a metal spoon with a temperature of 20oC is placed into a cup of water with a temperature of 90oC the spoon will heat up. This is an example of:

• A.

• B.

Conduction

• C.

Convection

B. Conduction
Explanation
When the metal spoon is placed into the hot water, the heat is transferred from the water to the spoon through direct contact. This process of heat transfer is called conduction. The particles in the spoon gain kinetic energy from the particles in the water, causing the spoon to heat up. Radiation refers to the transfer of heat through electromagnetic waves, which is not applicable in this scenario. Convection involves the transfer of heat through the movement of fluid, which is also not applicable here as there is no fluid movement involved.

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• 8.

### During a house fire, the smoke and flames rise up, but the air down near the floor is cooler and less smoky. This is an example of

• A.

• B.

Conduction

• C.

Convection

C. Convection
Explanation
During a house fire, convection occurs as the hot air and smoke rise upwards while the cooler air near the floor moves downwards. This is because hot air is less dense than cooler air, causing it to rise and create a convection current. Convection is the transfer of heat through the movement of fluids or gases, and in this case, it explains the movement of smoke and heat during a fire.

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• 9.

### this type of heat transfer occurs when heat moves from one molecule to another.

• A.

• B.

Conduction

• C.

Convection

B. Conduction
Explanation
Conduction is the correct answer because it refers to the heat transfer that occurs when heat moves from one molecule to another. In conduction, heat is transferred through direct contact between molecules, causing them to vibrate and transfer their thermal energy to neighboring molecules. This process continues until the heat is evenly distributed throughout the material.

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• 10.

### When heat is given off by light this type of heat is known as?

• A.

• B.

Conduction

• C.

Convection

Explanation
When heat is given off by light, it is known as radiation. Radiation is the transfer of heat through electromagnetic waves, such as infrared radiation. Unlike conduction and convection, which require a medium to transfer heat, radiation can occur in a vacuum as well.

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• 11.

### The transfer of heat between substances that are in direct contact with each other is called what?

• A.

• B.

Convection

• C.

Conduction

• D.

Heat Transfer

C. Conduction
Explanation
Conduction is the transfer of heat between substances that are in direct contact with each other. In this process, heat energy is transferred from the hotter substance to the colder substance through molecular collisions. Unlike convection and radiation, which involve the transfer of heat through a medium or through electromagnetic waves, conduction relies on direct contact between the substances.

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• 12.

### The rays in this picture is an example of

• A.

Conduction

• B.

Convection

• C.

Explanation
The rays in the picture are an example of radiation because radiation is the transfer of energy through electromagnetic waves. In the picture, the rays are depicted as waves radiating outwards, indicating the transfer of energy in the form of electromagnetic waves. Conduction and convection involve the transfer of energy through direct contact or the movement of particles, which is not depicted in the picture. Therefore, radiation is the most appropriate explanation for the given scenario.

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• 13.
• A.

Conduction

• B.

Convection

• C.

B. Convection
• 14.

### The air in the hot air balloon is heated and circulates.  This is an example of ...

• A.

Conduction

• B.

Convection

• C.

B. Convection
Explanation
The air in the hot air balloon is heated, which causes it to become less dense and rise. As the hot air rises, cooler air from the surroundings moves in to take its place, creating a circulation of air. This process of heat transfer through the movement of a fluid or gas is known as convection.

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• 15.

### You walk barefoot on the hot street and it burns your toes.  This is an example of...

• A.

Conduction

• B.

Convection

• C.

A. Conduction
Explanation
Conduction is the transfer of heat through direct contact between two objects. In this scenario, the hot street directly comes into contact with the bare feet, resulting in the transfer of heat from the street to the toes. Therefore, the burning sensation experienced is an example of conduction.

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• 16.

### A boy sits to the side of a campfire.  He is 10 feet away, but still feels warm.  This is an example of ...

• A.

Conduction

• B.

Convection

• C.

Explanation
The boy sitting to the side of the campfire feeling warm even though he is 10 feet away is an example of radiation. Radiation is the transfer of heat energy through electromagnetic waves. In this case, the campfire emits heat in the form of infrared radiation, which travels through the air and reaches the boy, making him feel warm. Conduction and convection are not applicable in this scenario as they involve direct contact or movement of a medium, which is not the case here.

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• 17.

### The transfer of energy in fluids or gases

• A.

Conduction

• B.

Convection

• C.

B. Convection
Explanation
Convection is the transfer of energy in fluids or gases through the movement of the particles within the substance. As the particles gain energy, they become less dense and rise, while the cooler and denser particles sink. This creates a continuous circulation of the fluid or gas, transferring heat energy from one point to another. Convection is commonly observed in everyday life, such as in the heating of a room through the circulation of warm air or the boiling of water in a pot.

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• 18.

### Light waves traveling through empty space

• A.

Conduction

• B.

Convection

• C.

Explanation
Light waves traveling through empty space can be explained by radiation. Radiation is the transfer of energy through electromagnetic waves, including light waves. Unlike conduction and convection, which require a medium such as a solid or a fluid, radiation can occur in a vacuum, like empty space. This is because electromagnetic waves do not require a physical medium to propagate. Therefore, the correct answer is radiation.

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• Current Version
• Mar 14, 2023
Quiz Edited by
ProProfs Editorial Team
• Sep 25, 2018
Quiz Created by
Ccraig

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