Question # 1

Why an even Carnot engine Carnot give 100% efficiency.

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We cannot find ideal sources

We cannot eliminate friction

We cannot reach absolute zero temperature

We cannot remove heat

Why freezer a refrigerator is located in the top section

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Motor is not affected

Heat gained from environment is less

The entire chamber of freezer is cooled quickly

Heat gained from environment is more

When a perfect gas is supposed to expand freely in an isolated vessel the gas has undergone.

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An increase in pressure

An increase in temperature

A change in phase

A change in entropy

When a hot liquid is mixed with a cold liquid temperature of the mixture.

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First decreases and then becomes constant

First increases and then becomes constant

Continuously decreaes

Is undefined for some time and then nearly becomes constant

Which of the following measures how quickly the thermometer liquid mainly because it

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Is coloriess

Is a bad conductor of heat

Does not expand linearly

Has a low boiling point

The actual gas can behave like an ideal gas at

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Low density and high pressure

High density and high pressure

Low density and low pressure

High density and low pressure

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

The law of equation of energy is applicable to the system whose constituents are.

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At rest

In orderly motion

in random motion

Moving at constant speed

Which kind of thermodynamic process is defined as with no heat transfer into or out of a system i.e. Q =0

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Isobaric process

Isochoric process

Isothermal process

Adiabatic process

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 zero point of Kelvin scale is called.

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Critical point

Terminal point

Absolute zero

Mid point

A given mass of air occupies 12 m2 at normal atmospheric pressure if the pressure is increased to 4 times the original value without changing the temperature what volume will the air occupy.

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3 cm3

6 cm3

9 cm3

12 cm3

If pressure and temperature of an ideal gas is doubled and volume is halved, the number of the gas molecules.

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Become half

Remain constant

Become double

Become three times

Which is the heat transfer mode between an object and its environment due to circular fluid motion.

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Conduction

Convection

Radiation

Mass transfer

Which statement about convection is correct.

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Brownian motion is a form of convection

Convection occurs only in gas

Convection results from a density change

Evaporation is a form of convection

In an isobaric process there is no.

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Pressure change

Internal energy change

Heat exchanged

volume change or work done

Which kind of motion is exhibited by molecules of monoatomic gas.

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Rotatory

Vibratory

Translatory

Random

A convention current is the movement of fluid caused by the change in.

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Pressure

Temperature

Densities

Volume

From any substance the temperature and pressure at which the material can coexist in all three states in equilibrium is called.

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Critical point

Triple point

Initial point

Final point

What is world's average surface air temperature.

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5 ^oC

10^oC

15 ^oC

20 ^oC

A metallic rod is continuously heated at its two ends, The heat following through the rod does not depend upon.

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Mass of the upon

Area of cross section of the rod

Temperature gradient between two ends

Time for which heat flow through the rod

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