Question # 1

Brownian motion increases due to

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Increase in size of Brownian particle

Increase in temperature of medium

Increase in density of medium

Increase in viscosity of medium

In an ideal gas, the molecules have:

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Kinetic energy only

Potential energy only

Both KE and PE

None of these

An amount of water of mass 20 g at 0°C is mixed with 40 g of water at 10°C. Final temperature of mixture is

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-20°C

6.67°C

5°C

0°C

First law of thermodynamic is special case of

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Law of conservation of energy

Charle's law

Law of conservation of mass

Boyle's law

Rice takes longest to cook

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In a submarine 100 m below the surface of the sea

At sea level

At Murree

At Mount Everest

Efficiency of carnot engine is independent of the

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temperature of sink

temperature of source

nature of the working substances

none of them

According to the second law, which is must to produce work

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a source contains a large amount of heat energy

two sources at the same temperature

two sources at the different temperatures

a source contains a small amount of energy

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

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isochoric process

isothermal process

adiabatic process

none of them

The product of the pressure and volume of an ideal gas is

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A constant

Approximately equal to the universal gas constant

Directly proportional to its temperature

Inversely proportional to its temperature

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

A real gas can be approximated to an ideal gas at

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Low density

High pressure

High density

Low temperature

Which of the following is a state variable

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entropy

pressure

volume

all of them

At constant temperature, if the density of the gas is increased, its pressure will:

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One kg of a substance

Unit volume of a substance

One mole of a substance

None of these

For the working of a heat engine, there must be

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a source of heat at high temperature

a sink at low temperature

both of them

none of them

In the formula P = N₀KT, N₀denotes:

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Number of molecules per unit per volume

Number of moles

Number of molecules

None of these

If the formula PV = nRT, n denotes:

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Number of molecules per unit volume

Number of moles

Number of molecules

None of these

When heat is removed from the system

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negative

positive

zero

any one of them

Which of the following does not have the same units:

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Work

Heat

Kinetic energy

Power

Real gases strictly obey gas law at:

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High pressure and low temperatures

Low pressures and high temperatures

High pressures and high temperatures

None of these

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

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35 %`

40 %

35 - 40 %

25 %

Adiabatic change occurs when the gas

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expands

compressed

expands or compressed

expands or compressed rapidly

The earliest heat engine was

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petrol engine

diesel engine

electric engine

steam engine

Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:

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Newton's second law

Pascal's law

Carnot theorem

Second law of thermodynamics

At what temperature the adiabatic change is equivalent to the isothermal change?

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Zero degree Celsius

Zero Kelvin

Critical temperature

Above critical temperature

The absolute temperature of the tripple point of water is

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100°C

4°C

373 K

273.16 K

Amount of heat required to raise the temperature of a body through 1 K is called its

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Specific heat

Water equivalent

Thermal capacity

Entropy

Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be

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R/2

P

2P

Depending on the relative mass of the gases

We can express the work in term of

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directly measurable variables

indirectly measurable variables

either of them

both of them

A diatomic gas molecule has

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translational energy

rotaional energy

vibrational energy

all of them

The second law of thermodynamics is concerned with the circumstances in which

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heat can be converted into work

direction of flow of heat

none of them

both of them

Electromagnetic waves emitted by hot bodies are called:

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Photoelectrons

Alpha rays

Thermal radiation

None of these

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