Quiz(Law of thermodynamics)

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

The first law of thermodynamics is a restatement of the

• Zeroth law of thermodynamics

• Law of heat addition

• Principle of entropy

• Conservation of energy

The internal energy of an ideal gas depends on

• Volume and temperature

• Pressure and temperature

• Volume

• Temperature only

Tags

NGSS.HS-PS3-2

The internal energy change in a system that has absorbed 2Kcal of heat and done 500J of work is

• 7900J

• 8900J

• 6400J

• 5400J

Tags

NGSS.HS-PS3-1

If  $\gamma$  is the ratio of specific heats and R is the universal gas constant,then the molar specific heat at constant volume Cv is given by

•  $\gamma R$  

•  $\frac{\left(\gamma-1\right)R}{\gamma}$  

•  $\frac{R}{\gamma-1}$  

•  $\frac{\gamma R}{\gamma-1}$  

When a gas undergoes isothermal expansion, its internal energy

• Increase

• decrease

• remains constant

• zero

The total work done in thermodynamic process is given by

• $\int_{V1}^{V2}\ \ PdV$

• $\int_{V1}^{V2}\ \ VdP$
  

• total area under the given curve

• total volume under the given curve

The conditions for the thermodynamic process to be isothermal,

• Temperature remains constant

• Pressure remains constant

• The process should be very slow and the walls of cylinder should be perfectly conducting

• The process should be very fast and the walls of cylinder should be perfectly non-conducting

Which curve represents isothermal curve?

• AB

• BC

• CD

• DA

What is the name of a device that converts thermal energy into work?

• Heating system

• Heat engine

• Refrigerator

• entropy