# IIT JEE/IIT JEE Heat And Thermodynamics Sample Test,Sample questions

## Question: ```9.For an isolated system: ```

1.volume is constant

2.pressure is constant

3.all of these

4.20.Internal energy of ideal g

1.3.75 J

2.37.5 J

3.0.375 J

4.0.75 J

1.30%

2.40%

3.15%

4.25%

## Question: ```Air in a cylinder is suddenly compressed by a piston which is then maintained at the same position. With the passage of time: the pressure decreases ```

1.the pressure increases

2.the pressure remains the same

3.the pressure may increase or decrease depending on the nature of the ga

4.none of them

1.2 km/s

2.8 km/s

3.0.5 km/s

4.1 km/s

1.50 K

2.20 K

3.40 K

4.100 K

## Question: ```During adiabatic change, specific heat is: ```

1.zero

2.greater than zero

3.less than zero

4.infinity

## Question: ```During an isothermal expansion of an ideal gas: ```

1.its internal energy decreases

2.its internal energy does not change

3.the work done by the gas is equal to the quantity of heat absorbed by it

4.both B and C are correct

## Question: ```During severe winter in the low temperature zones of the world, the superficial parts of the lakes are frozen leaving water below. That the freezing at the bottom is prevented because: ```

1.the conductivity of ice is low

2.the water has large latent heat of fusion

3.the water has large specific heat

4.the temperature of the earth at the bottom of lake is high

## Question: ```For a perfect gas if: ```

1.P and V are given T is uniquely determined

2.T is given P is uniquely determined

3.T is given V is uniquely determined

4.T is given P and V both are uniquely determined

## Question: ```Gas exerts pressure on the walls on the container because: ```

1.gas has weight

2.gas molecules have momentum

3.gas molecules collide with each other

4.gas molecules collide with the walls of the container

## Question: ```Heat cannot be itself flow form a body at lower temperature to a body at higher temperature is a statement of consequence of: ```

1.second law of thermodynamics

2.conservation of momentum

3.conservation of mass

4.thermodynamics

## Question: ```Heat given to a body which raises its temperature by 1degree centigrade is: ```

1.water equivalent

2.thermal capacity

3.specific heat

1.positive

2.negative

3.negligible

4.zero

## Question: ```If gas is compressed adiabatically: ```

1.the internal energy of gas increases

2.the internal energy of gas decreases

3.the internal energy of gas does not change

4.the work done is positive

1.Kl / A

2.I / KA

3.AK / l

4.A / Kl

## Question: ```If mass-energy equivalence is taken into account, when water is cooled to form ice, the mass of water should: ```

1.increase

2.remain unchanged

3.decrease

4.first increase then decreas

## Question: ```If r, a and t represent the reflection coefficient, absorption coefficient and transmission coefficient respectively, then for a perfectly black body ```

1.r = 0, a = 1, t = 0

2.r = 1, a = 0 and t = 0

3.r = 0, a = 0, t = 0

4.r = 0, a = 0 and t = 0

## Question: ```If the door of a refrigerator is kept open then which of following is true? ```

1.Room is cooled

2.Room is heated

3.Room is either cooled or heated

4.Room is neither cooled nor heated

1.140 J

2.70 J

3.110 J

4.150 J

## Question: ```In a thermodynamic system working substance is ideal gas its internal energy is in the form of: ```

1.kinetic energy only

2.kinetic and potential energy

3.potential energy

4.none of the above

## Question: ```Internal energy of ideal gas depend on: only volume none of these```

1.only pressure

2.temperature is constant

3.only temperature

4.none of these

## Question: ```Molar heat capacity is directly related to: ```

1.temperature

2.heat energy

3.molecular structure

4.mass

## Question: ```Pyrometer is an instrument used to measure: ```

1.High temperatures

2.Low temperatures

3.Specific heat

4.Latent heat

1.translatory

2.vibratory

3.rotatory

4.none of these

## Question: ```The internal energy U is a unique function of any state because change in U: depend upon path corresponds to an adiabatic process ```

1.does not depend upon path

2.depend upon path corresponds to an adiabatic process

3.corresponds to an isothermal process

4.none of the above

1.0.56 L

2.1.2 L

3.2.4 L

4.5.6 L

## Question: ```The most efficient heat engine is one which is: ```

1.reversible

2.irreversible

3.driven by high speed diesel

4.none of the above

1.100 kPa

2.200 kPa

3.400 kPa

4.800 kPa

## Question: ```The process in which the heat is not transferred from one state to another, is: isothermal process ```

1.isothermal process

3.isobaric process

4.isochoric process

1.1:06

2.1:12

3.1:03

4.1:04

1.2

2.1.58

3.1.6

4.1.31

1.Fahrenheit

2.Celsius

3.Kelvin

4.Reaumur

## Question: ```The specific heat of gas in an isothermal process is: ```

1.zero

2.infinite

3.first law of

4.remains constant

## Question: ```The standard fixed point for temperature measurement is used these day is: ```

1.melting point of ice at STP

2.that temperature at which ice water and water vapour coexist

3.that temperature at which pure ice and pure water coexist

4.none of these

1.300 K

2.2.46 K

3.27 K

4.7K

1.1

2.6

3.5

4.1.5

1.7:04

2.4:07

3.49:16:00

4.16:49

## Question: ```Two thermometers are constructed in such a way that one has a spherical bulb and other has elongated cylindrical bulb The bulbs are made of same material and thickness Then: ```

1.spherical bulb will respond more quickly to temperature changes

2.cylindrical bulb will respond more quickly to temperature changes

3.both bulbs will respond same to temperature changes

4.none of both bulbs respond to temperature changes

## Question: ```Two vessels having equal volume contain molecular hydrogen at one atmosphere and helium at two atmospheres respectively. If both samples are at the same temperature the mean velocity of hydrogen molecules is: ```

1.equal to that of helium

2.twice that of helium

3.half that of helium

4.v2 times that of helium

## Question: ```Unsaturated vapour obeys: ```

1.Ideal gas law

2.Van der Walls law

3.Boyles law

4.Gay-Lussacs law

1.-5188 J

2.5000 J

3. 5188 J

4.-5000 J

## Question: ```When a gas is allowed to expand suddenly into a vacuum chamber, then: ```

1.heat supplied is zero

2.temperature remains constant

3.volume does not change

4.both A and C are correct

## Question: ```When a metal rod is heated it expands because: ```

1.the size of its atoms increases

2.the distance among its atoms increases

3.atmospheric air rushes into it

4.the actual cause is still unknown

## Question: ```When rod is heated but prevented from expanding, the stress is independent of: ```

1.material of the rod

2.rise in temperature

3.length of rod

4.none of these

## Question: ```When water is heated from 0 degree Centigrade to 10 degree centigrade its volume: ```

1.increases

2.decreases

3.remains unchanged

4.first decreases then increases

## Question: ```When without change in temperature a gas is forced in a smaller volume, its pressure increases because its molecules: ```

1.strike the unit area of the container wall more often

2.strike the unit area of the container wall at higher speed

3.strike the unit area of container wall with greater force

4.have more energy

1.Mercury

2.Water

3.Copper

4.Sodium

1.Volume

2.Temperature

3.Pressure

4.Work

1.Kinetic energy

2.Momentum

3.Density

4.Speed

## Question: ```Which of the following statements is correct for any thermodynamic system? ```

1.The internal energy changes in all processes Internal energy and entropy are state functions

2.The change in entropy can never be zero

3.The work done in an adiabatic process is always zero

4.none of them

## Question: ```Which statement is incorrect? ```

1.All reversible cycles have same efficiency

2.Reversible cycle has more efficiency than an irreversible one

3.Carnot cycle is a reversible one

4.Carnot cycle has the maximum efficiency in all cycles

## More MCQS

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