Question # 1

A diatomic gas molecule has

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translational energy

rotaional energy

vibrational energy

all of them

One mole of any substance contain

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same number of molecules

different number of molecules

may be same or different

none of them

Gas constant per molecule is called:

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Universal gas constant

Stefen's constant

Boltzmann constant

Gravitation constant

The value of E₀in coulomb's law is:

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9 x 10⁹Nm²C^-2

8.85 x 10^-12C²N^-1m^-2

8.85 x 10^-12Nm²C^-2

9 x 10⁹C²N^-1m^-2

In an ideal gas, the molecules have:

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Kinetic energy only

Potential energy only

Both KE and PE

None of these

Electromagnetic waves emitted by hot bodies are called:

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Photoelectrons

Alpha rays

Thermal radiation

None of these

The unit of thermodynamical scale is

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centigrade

fahrenheit

kelvin

none of them

Maximum density of H₂O is at the temperature

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32°F

39.2°F

42°F

4°F

The behaviour of gases is well accounted by the kinetic theory based on

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microscopic approach

macroscopic approach

both of them

none of them

The curve representing an isothermal process is called

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adiabat

isotherm

fixed temperature

none of them

At O° K which of the following properties of a gas will be zero?

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Kinetic energy

Potential energy

Vibrational energy

Density

If R is gas constant for 1 gram mole, C_pand C_vare specific heat for a solid then

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C_p- C_v= R

C_p- C_{v < R}

C_p- C_{v = 0}

C_p- C_{v > R}

In the theory of dimensional analysis, heat may be properly represented by:

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ML²T^-2

MT^-2

ML^-1T^-1

None of these

In case of an ideal gas, the P.E associated with its molecule is

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maximum

zero

minimum

not fixed

The efficiency of diesel engine is

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25%

25 - 30%

35%

35 - 40%

Which of the following is not thermo dynamical function?

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Enthalpy

Work done

Gibb's energy

Internal energy

For making cooking utensils, which of the following pairs of properties is most suited?

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Low specific heat and high conductivity

Low specific heat and low conductivity

High specific heat and high conductivity

High specific heat and low conductivity

The work done on the system by the environment is considered as

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positive

negative

zero

any one of them

On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands

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adiabatically

isothermally

isochorically

isobarically

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