Question # 1

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

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heat capacity

specific heat capacity

specific heat at constant volume

specific heat at constant pressure

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

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outwards

inwards

in either way

none of these

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

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

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Metal has high specific heat

Metal has high thermal conductivity

Metal has low specific heat

Metal has low thermal conductivity

First law of thermodynamics is consequence of conservation of

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Work

Energy

Heat

All of these

For making cooking utensils, which of the following pairs of properties is most suited?

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Low specific heat and high conductivity

Low specific heat and low conductivity

High specific heat and high conductivity

High specific heat and low conductivity

The ideal gas law is

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P = nRT

V = nRT

PV =RT

PV =nRT

If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I³gives the:

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Force

Density

Work done

Pressure

The efficiency of petrol engine is usually not more than 25% to 30% because of

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friction

heat losses

both of them

none of them

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

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546 K

273 K

546°C

273°C

A heat engine is that which converts

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mechanical energy into thermal energy

thermal energy into mechanical energy

K.E into potential energy

heat energy into light energy

On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands

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adiabatically

isothermally

isochorically

isobarically

The pressure exerted by the gas is

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directly proportional to the P.E

inversely proportional to the P.E

inversely proportional to the K.E

directly proportional to the K.E

Energy gas behaves like an ideal gast at

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High temperature and low pressure

Low temperature and high pressure

Both A and B

None

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 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

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ECAT Physics Chapter 11 Heat & Thermodynamics Online Test MCQs With Answers

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