Question # 1

Which of the following is a state variable

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entropy

pressure

volume

all of them

The percentage of available heat energy converted into work by a diesel engine is roughly

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35 %`

40 %

35 - 40 %

25 %

The process which is carried out at constant temperature is known as

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adiabatic process

isothermal process

isochoric process

none of them

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}

One kilogram of different substances contain

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same number of molecules

different number of molecules

may be same or different

none of them

In thermodynamics, internal energy is the function of

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temperature

pressure

state

none of them

Which of the following is not thermo dynamical function?

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Enthalpy

Work done

Gibb's energy

Internal energy

Boyle's law is applicable in

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Isochoric process

Isothermal process

Isobaric process

Isotonic process

If an amount of heat enters the system it could

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decrease the internal energy

not change the internal energy

increase the internal energy

none of them

The earliest heat engine was

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petrol engine

diesel engine

electric engine

steam engine

Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:

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N = nN_Am = MN_A

n = N N_A, M = mN_A

M = N_A/N , N_A= m/n

N = nN_A, M = mN_A

Triple point of water is

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273.16°F

372.16K

273.16°F

273.16

The basis to define a temperature scale that is independent of material properties is provided by

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carbon cycle

nitrogen cycle

Carnot cycle

irreversible cycle

While deriving equation of pressure by kinetic theory of gases, we take into account:

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Only linear motion of molecules

Only rotational motion

Only vibratory motion

All of these

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

The heat required to raise the temperature of one mole of the substance through 1 K is called

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heat capacity

specific heat capacity

molar specific heat

all of them

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