Thermodynamics

Science

Lesson

THERMODYNAMICS DEALS with:

• heat

• Work

• Temperature

• Their relation to energy

• Radiation

• & Physical properties of matter.

Made Simple

Thermodynamics in our daily life.

• The second law of thermodynamics plays the most important role in making our life easier,

• i.e. heat transfer, which relates to transfer of heat between two mediums.

• There are three modes of heat transfer: conduction, convection and radiation.

Multiple Choice

Transfer of heat from low temperature to high temperature is

• None of these

• Possible by doing some external work

• Possible by keeping both the bodies in contact

• Impossible

Multiple Choice

Zeroth law of thermodynamics is:

• Kinetic energy of molecules of a gas is zero

• Ideal gas does not contain molecules

• If two systems are thermal equilibrium third one is also in equilibrium

• Absolute zero temperature cannot be obtained

Multiple Choice

Radiation

• The transfer of thermal energy as electromagnetic waves

• The transfer of thermal energy through solids

• The transfer of thermal energy through liquids and gases

Multiple Choice

Convection

• The transfer of thermal energy through liquids and gases

• The transfer of thermal energy through solids

• The transfer of thermal energy as electromagnetic waves

Multiple Choice

Conduction

• The transfer of thermal energy through solids

• The transfer of thermal energy through liquids and gases

• The transfer of thermal energy as electromagnetic waves

Multiple Choice

Insulator

• A material the energy does NOT transfer through easily

• A material that thermal energy travels through easily

• The measure of the kinetic energy of an object’s molecules

Multiple Choice

Conductor

• A material that thermal energy travels through easily

• A material that energy does NOT transfer through easily

• Energy that travels in the form of electromagnetic waves

Multiple Choice

2nd law of thermodynamics

• Every time energy changes form, some of it is lost to the environment

• Energy can't be created or destroyed

• All energy generates heat

Multiple Choice

The 1st law of Thermodynamics

• Energy can not be created or destroyed. It just changes forms.

• Energy can only be created by the sun

• Some energy is lost to the environment.

Multiple Choice

Do molecules generally move faster at 45 C or 106 C?

• 45 C because molecules have more energy than in 106C

• 106 C because molecules have more energy than in 45C

• 106 C because molecules have less energy than in 45C

• 45C because molecules have less energy than in 106 C

Multiple Choice

Warm air rises and cold air sinks demonstrates what?

• conduction
• convection
• radiation
• refrigeration

Multiple Choice

Transfer of heat in a gas or liquid by the motion of particles in the heated fluid

• conduction

• convection

• radiation

Multiple Choice

The first law of thermodynamics is a restatement of the

• Zeroth law of thermodynamics
• law of heat addition
• principle of entropy
• conservation of energy

Multiple Choice

The first law of thermodynamics states that the change in the internal energy of a system is equal to the difference in energy transferred to or from the system as heat and

• mass
• work done
• force
• pressure

Multiple Choice

When thermal energy is added to a substance, the substance's particles move:

• More rapidly at an increased diestance from each other.
• More rapidly with less distance between each other.
• More slowly with a greater distance between each other.
• More slowly with a reduced distance between each other.

Multiple Choice

The transfer of thermal energy between objects of different temperatures is called...

• temperature
• heat
• internal energy
• none of these

Multiple Choice

A slower particle has a lower energy than an identical, faster particle.

• True
• False