Q4M4 Post Test

My brother is planning a piece of wood with his planar. After a few minutes, he observed that it is hot. Is there evidence of heat transfer?

• There is no evidence.
• Yes, hotness means there is an increase in the temperature.
• Yes, hotness means there is a decrease in the temperature.
• No, hotness is not related to a change in temperature.

A beaker containing 200 g of water has 800 J of work done on it by stirring and 100 cal of heat added to it from a hot plate. What is the change in the internal energy of the water in Joules?

• 2119 J
• 1291 J
• 2308 J
• 1219 J

If 175 J of energy is added to a system that does not apply external work, by how much is the thermal energy of the system raised?

• 175 J
• 100 J
• 75 J
• 0

Lila stretched a rubber band five times. After that, she observed that the rubber band felt warmth. Did the rubber band gain heat?

• No, it is not evident.
• No, temperature is not related to a gain or loss of heat.
• Yes, the felt warmth means it loss heat.
• Yes, the felt warmth means it gained heat.

Why does a can of soda remain at a constant cool temperature inside a refrigerator?

• Because the amount of heat flowing into the can could not be determined since there is no temperature installed in the refrigerator.

• Because the amount of heat flowing into the can is less than to the heat flowing out.

• Because the amount of heat flowing into the can is exactly equal to the heat flowing out.

• Because the amount of heat flowing into the can is greater than the heat flowing out.

An ideal gas is compressed without allowing any heat to flow into or out of the gas. What will happen to the temperature of the gas in this process?

• The temperature decreases since heat flows during the process.
• The temperature increases since no heat flows during the process.
• The temperature could not be determined since heat is absorbed during the process.
• The temperature remains the same since heat flows in and out on the process.

Is it possible to change the temperature of a glass of water by stirring the water if the glass is insulated from its surroundings?

• Yes, stirring the water increases its internal energy causing the increase of its temperature.
• Yes, stirring the water decreases its internal energy causing the decrease of its temperature.
• No, stirring will not affect the temperature of the water.
• No, insulation prevents the change of temperature of the water.

How can you reverse the process of keeping the food from spoilage?

• By using refrigerator
• By using motor
• By using aircon
• By putting them together using scotch tape

What is commonly used as a refrigerant for most refrigerators?

• Gas that is easy to liquefy.
• Liquid that is easy to liquefy.
• Gas that is hard to liquefy.
• Liquid that is hard to liquefy.

Which of the following is a non-spontaneous process?

• Drying of leaves
• Making ice candy
• Spoilage of food
• Waterfalls