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Test: Change of Phase


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Test: Change of Phase for NEET 2022 is part of Topic-wise MCQ Tests for NEET preparation. The Test: Change of Phase questions and answers have been prepared according to the NEET exam syllabus.The Test: Change of Phase MCQs are made for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Change of Phase below.
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Test: Change of Phase - Question 1

A student added a drop of red food coloring to 4 beakers of water.Each beaker contained 100 ml of a different temperature water. The student recorded how long it took each beaker to mix completely (without stirring). The following table shows her results:

What conclusion should the student make from this experiment? Particles are moving

Detailed Solution for Test: Change of Phase - Question 1

Adding heat energy to water increases the motion of the water molecules and the molecules of food coloring. The faster moving molecules cause the food coloring to mix into the water faster. The water molecules and food coloring molecules in cold water don't move as quickly as in hot water.

Test: Change of Phase - Question 2

Which diagram is the best depiction of the direction of flow of diffusion?

Detailed Solution for Test: Change of Phase - Question 2

The net flow of solute is from its higher concentration to lower concentration.

Test: Change of Phase - Question 3

When two light nuclei combine to form a heavier nucleus, process is said to be

Detailed Solution for Test: Change of Phase - Question 3

This process is called nuclear fusion. It is found in the sun. Nuclear fission is a reaction in which two small nuclei combine together to form a big nuclei and release energy. This type of reaction takes place in sun and is the reason behind the massive amount of energy it sun provides.

Test: Change of Phase - Question 4

The temperature and pressure at which all three phases of a substances coexist is called

Detailed Solution for Test: Change of Phase - Question 4

The temperature and pressure at which all three phases of a substances coexist is called triple point​. By the definition.

Test: Change of Phase - Question 5

An increase in temperature in a liquid would cause a phase change to which of the following?

Detailed Solution for Test: Change of Phase - Question 5

Increasing the temperature of liquid, increases the average K.E. of the molecules. The molecules start moving vigorously in all the directions, thereby increasing and the inter-molecular space between them. Thus, the liquid changes into gas.

Test: Change of Phase - Question 6

What happens to the volume of the substance when the temperature increases?

Detailed Solution for Test: Change of Phase - Question 6

In general, the liquids tend to expand when their temperature increases. For example, the same mass of boiling water occupies more volume at 100 degrees Celsius than at 20 degrees Celsius. Therefore, increasing temperature decreases density.

Test: Change of Phase - Question 7

Skating is possible on snow due to the formation of water below the skates. This water below skates comes as result of

Detailed Solution for Test: Change of Phase - Question 7

As the pressure increases between the skates and ice, the ice starts melting below 0o C.

Test: Change of Phase - Question 8

SI unit of latent heat is

Detailed Solution for Test: Change of Phase - Question 8

Latent heat is a measure of the heat energy (Q) per mass (m) released or absorbed during a phase change. The SI units are joule per kilogram [J/kg]

Test: Change of Phase - Question 9

Melting point of ice decreases with

Detailed Solution for Test: Change of Phase - Question 9

When ice melts the volume decreases and an increase in pressure will support this phenomena according to Le Chatalier’s rule.

Test: Change of Phase - Question 10

If the m mass of the substance undergoes a change from one state to another, then the amount of heat required for the process is

Detailed Solution for Test: Change of Phase - Question 10

When a body changes its state or phrase it requires latent heat, rather than the specific heat.

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