Tag: measurement of properties

Questions Related to measurement of properties

Value of Plank's constant is equal to:

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. $6.625 \times 10^{-34}$ J. sec.

  2. $6.25 \times 10^{-34}$ J. sec.

  3. $662.5 \times 10^{-34}$ J. sec.

  4. none of these

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Correct Option: A
Explanation:

The Planck's constant is named after the physicist Max Planck. It links the frequency of the electromagnetic wave of a photon to its amount of energy.

         $E=hv$
$h\rightarrow$ planck's constant $=6.625\times 10^{-34} J.sec.$

Temperature is a measure of :

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. the average kinetic energy of the particles in a substance.

  2. the average potential energy of the particles in a substance.

  3. the highest amount of kinetic energy the particles in a substance have.

  4. the number of particles a substance has.

  5. the amount of heat a substance has.  

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Correct Option: A,E
Explanation:

Temperature is a measure of the average kinetic energy of the particles in a substance. 


As the average kinetic energy of the particles in a gas is proportional to the temperature of the gas.

Hence the correct options are A and E.

Which units of pressure are needed if you are going to use 0.0821 as your ideal gas constant?

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. Atmospheric

  2. Torr

  3. Psi

  4. mmHg

  5. Pascals

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Correct Option: A
Explanation:

Gas constant = $0.0821 $  $L atm K^{−1} mol^{−1}$


atm ( Atmospheric unit is used )

Hence the correct option is A.

Which of the following measures pressure?

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. Barometer

  2. Thermometer

  3. Pycnometer

  4. Parameter

  5. Pressometer

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Correct Option: A
Explanation:

A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. Pressure tendency can forecast short term changes in the weather. Numerous measurements of air pressure are used within surface weather analysis to help find surface troughs, high pressure systems and frontal boundaries.