Question # 1

Which one is the primary standard for temperature measurement.

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Resistance thermometer

Mercury in glass thermometer

Constant volume gas thermometer

Pyrometer

Which of the given geometries will result in the largest convection consfficient.

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Vertical plate

Diagonal plate

horizontal plate facing upwards

Horizontal plate facing downwards

In onw cycle of a steam engine there are how many dead centres.

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1

2

3

zero

Thermodynamics concern its primary with the

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Measurement of quantity of heat

Physical effects of temperature changes

Conversion of heat into other energy forms

Behavior of gases

Which of the following is heat transfer by means of the emission or absorption of electromagnetic radiation such as sunshine.

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Conduction or diffusion

Convection

Radiation

Mass transfer

The behavior of the gases that can be easily liquefied is like that of the.

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Triatomic gases

Ideal gases

Van der walls gases

Dia atomic gases

How solid hydrogen is obtained.

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By cascade process

By joule kelvin effect

By adiabatic expansion

Lowering temperature below melting point

Which quantity must be the same for two bodies if they are to be in thermal equilibrium.

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Internal energy

P.E

Temperature

Mass

Gas exert pressure on walls of the visual because gas molecules.

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Posses momentum

Have finite volume

Collide with each other

Obey gas laws

Efficiency of a Carnot engine can never be 1 or 100% unless cold reservoir is at absolute temperature.

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0 K

100 K

273 K

373 K

Which law states that if two systems are in thermal equilibrium with a third system they are also in the thermal equilibrium with each other.

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Third law of thermodynamics

Second law of thermodynamics

First law of thermodynamics

Zeroth law of thermodynamics

The change in entropy for any reversible cycle is identically

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Infinite

Positive

Negative

Zero

How many calories of heat are required to evaporate completely 1 g or ice at 0^oC

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120 calories

520 calories

720 calories

920 calories

Specific heat a different substances varies becouse of

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Same number of molecules in unit mass

Different number of molecules in unit mass

Different K.E. of molecules in unit mass

Same K.E. of molecules in unit mass

What happens to internal energy of a piece of lead when hammered.

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Increases

Decreases

Remains unchanged

Becomes zero

The efficiency of a diesel engine is about

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15% to 35 5

355 to 40%

45% to 655

505 to 65 %

In Isochoric process there is no

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Work done

Internal energy change

Volume change or work done

Heat exchanged

In order of a cyclic heat engine operating between two heat reservoirs to be as efficient as a Carnot engine. It must be.

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A gas engine

Adiabatic

Reversible

A refrigerator

The process in which no heat enters or leaves the system is called.

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Isdobaric

Isochoric

Isothermal

Adiabatic

Two stem engine A and B have their sources at 900 K and 600 K and their sinks are at 450 K and 300 K respectively.

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They are equally efficient

A is less efficient than B

a is more efficient than B

Their efficiencies cannot be determined

By definition a gas is said to be have undergone adiabatic compressing when

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No heat exchange occurs between the gas and its surroundings

The gas is compressed quickly

The gas is compressed slowly

The temperature of the gas remains constant

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