1.
Radiation is direct heat.
Correct Answer
B. False
Explanation
Radiation is not direct heat. Heat can be transferred through radiation, conduction, or convection. Radiation refers to the transfer of heat through electromagnetic waves, such as from the sun to the Earth. It does not require direct contact between objects.
2.
Liquids are... (definite_____?) (container included)
Correct Answer(s)
A. Definite shape
B. Definite volume
Explanation
Liquids are considered to have a definite shape because they take the shape of the container they are in. They also have a definite volume, meaning that they occupy a specific amount of space. Unlike gases, which can expand to fill the entire volume of a container, liquids maintain their shape and volume.
3.
What is convection transferred by?
Correct Answer
C. Both
Explanation
Convection is a mode of heat transfer that occurs through the movement of fluids. It can be transferred by both gas and air as well as liquids. In convection, heat is transferred through the movement of the fluid particles, which can be either gas or liquid. This movement creates a circulation pattern, transferring heat from one location to another. Therefore, both gas and air, as well as liquids, can facilitate the transfer of heat through convection.
4.
When heat energy is added to liquids the molecules move faster and collides into each other until moves freely into space, it changes into a gaseous state called, "steam". This is called evaporation
Correct Answer
A. True
Explanation
When heat energy is added to liquids, the molecules gain kinetic energy and move faster. As a result, they collide with each other more frequently and with greater force. Eventually, some of the molecules gain enough energy to overcome the intermolecular forces holding them together and escape into the surrounding space, forming a gas. This process is known as evaporation. Therefore, the statement that adding heat energy to liquids causes them to change into a gaseous state called "steam" is true.
5.
Direct heat is called _________.
Correct Answer
Conduction
Explanation
Direct heat transfer refers to the process in which heat is transferred from one object to another through direct contact. This process is known as conduction. Conduction occurs when heat energy is transferred from a region of higher temperature to a region of lower temperature through the collision of particles. In this case, the correct answer is "Conduction" because it accurately describes the process of direct heat transfer.
6.
There are two different states of matter.
Correct Answer
B. False
Explanation
The statement is false because there are actually three different states of matter: solid, liquid, and gas.
7.
States of matter.
Correct Answer(s)
A. Liquids
D. Solid
E. Gas
Explanation
The given answer includes three states of matter: liquids, solid, and gas. These are the three most common states of matter that substances can exist in. Liquids have a definite volume but no definite shape, solids have both a definite volume and shape, and gases have neither a definite volume nor shape. Therefore, the answer correctly identifies the three main states of matter.
8.
When the liquid is heated, it changes quickly into a gas. This is called "steam".
Correct Answer
B. False
Explanation
The given statement is incorrect. When a liquid is heated, it changes into a gas, but it does not change quickly. The process of a liquid changing into a gas is called vaporization or evaporation. Steam specifically refers to the gaseous state of water, so it is not the general term for the gas state of any liquid. Therefore, the correct answer is False.
9.
A convection current is when
Correct Answer
A. Gas or liquid warms up and rises, or cools and falls
Explanation
The correct answer is "Gas or liquid warms up and rises, or cools and falls." This explanation refers to the process of convection, which occurs when a gas or liquid is heated and becomes less dense, causing it to rise. As it rises, it cools down and becomes denser, eventually falling back down. This movement of warm and cool fluids creates convection currents.
10.
What happens when liquids or gas are heated?
Correct Answer
C. Both
Explanation
When liquids or gas are heated, the molecules within them gain energy and start moving faster. This increased molecular movement causes the molecules to spread out and move farther apart from each other. As a result, the substance expands and becomes less dense. Therefore, both of the given statements are correct.
11.
A good example for radiation is the _____.
Correct Answer
Sun
Explanation
The Sun is a good example of radiation because it emits various forms of radiation, including visible light, ultraviolet (UV) radiation, and infrared (IR) radiation. These radiations are emitted in the form of electromagnetic waves and travel through space, allowing us to see and feel the warmth of the Sun. The Sun's radiation is essential for life on Earth as it provides heat, light, and energy for various biological processes.
12.
What are some heat transfer things that you can find in house?
Correct Answer
C. Both
Explanation
Both a spoon in a bowl of soup and a lightbulb can be considered examples of heat transfer in a house. In the case of the spoon in a bowl of soup, heat is transferred from the hot soup to the spoon through conduction, as the molecules in the soup collide with the molecules in the spoon, transferring their thermal energy. On the other hand, a lightbulb generates heat through the process of converting electrical energy into light and heat energy. This heat is then transferred to the surrounding air through convection, as the hot air rises and is replaced by cooler air.
13.
What is one example of heat transfer that can be found in a movie theater?
Correct Answer
A. Popcorn machine
Explanation
One example of heat transfer that can be found in a movie theater is a popcorn machine. The popcorn machine uses heat to pop the popcorn kernels, transferring the heat energy to the kernels and causing them to pop. This heat transfer process is essential in creating the delicious popcorn that is often enjoyed while watching a movie at the theater.
14.
Where can you find heat transfer in public places?
Correct Answer
Malls
Grocery stores
Amusement park
Explanation
Heat transfer can be found in public places such as malls, grocery stores, and amusement parks. These places typically have various heating and cooling systems in place to maintain a comfortable temperature for visitors. Heat is transferred through the air conditioning systems, radiators, and heating vents present in these establishments. Additionally, heat transfer can also occur through the use of appliances and equipment that generate heat, such as ovens in grocery stores or grills in amusement parks.