Question # 1

What is the heat required in Kilo joules when the temperature of 100 g of copper is raised thgough 20 K/. Specific heat capacity of copper is 0.4 x 10-3 kg -1 k-1

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0.4 kj

0.8 kj

400 kj

800 kj

Which following properties of molecules of a gas is same for all gases at a particular temperature.

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Momentum

Mass

velocity

K.E.

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

In which thermodynamic process enthalpy of the system remains constant.

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Isenthalpic process

Isolated process

Isobaric process

Isochoric process

The pressure of a gas is directly proportions to

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Mean velocity of the molecules

Mean square velocity of the molecules

Root mean square velocity of the molecules

Instantaneous velocity of the molecules

When ever a system is made to complete a cyclic process the work done during the complete cycle.

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Is zero

Is negative

Is positive

Depends upon the path followed

In free expansion of a gas. the internal energy of the system.

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Increases

Descreases

Remain unchanged

Becomes infinite

Which of the following is a thermodynamic temperature scale.

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Celsius scale

Fahrenheit scale

Kelvin scale

Rankine scale

The amount of heat needed per unit mass to raise the temperature of a system one degree at constant pressure is numerically aqual to

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The specific heat

The specific thermal energy

The specific heat at constant pressure

the internal energy of the gas

Heat Carnot be transferred from a colder to a hotter region unless work is done This is the statement of.

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Firs law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

Zeroth law of thermodynamcis

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 internal inertia of a thermodynamics system is known as.

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Enthalpy

Entropy

Isotherm

Adiabatic

What type of process is the Carnot's cycle.

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Reversible

Irreversible

Neither reversible nor irreversible

May be reversible or irreversible

What happens to Carnot efficiency if the source temperature increases.

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Decreases

Increases

Remain the same

Becomes zero

How does heat transfer between objects.

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From cold to hot objects

From hot to cold objects

By electromagnetic radiations

From hotter to hottest objects.

Mean free path of gas molecules in inversely proportional to its.

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Weight

Temperature

Pressure

Volume

What is the triple point of water.

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273 .15 K

0 K

100 K

0 oC

The pressure of a goas is directly proportion to

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Mean velocity of the molecules

Mean square velocity of the molecules

Root mean square velocity of the molecules

Instantaneous velocity of the molecules

A diatomic gas contains only

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Translational K.E.

Rotational K.E.

Vibrational K.E.

All of these

The internal energy of monoatomic gas is.

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3/2 RT

Independent of temperature

In the form of K.E.

Partially kinetic and partially potential

Net change in entropy of a system in a Carnot's cycle in

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Positive

Negative

Zero

Infinite

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PPSC Physics Chapter 3 Thermal Properties of Matter MCQs With Answers

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