# Physics Practice MCQs Chapter 11 Class 11

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Created on By Ali Durrani

Physics Ch 11 Class 11 Heat and Thermodynamics

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A machine worker placed a cylinder with a diameter of 18 cm between the plates of a hydraulic press. If he applies a 4.25 x 105N force to the cylinder, the stress on the end of the cylinder due to the applied force is A x 107Pa.

What is the value of A?

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Heat and Thermodynamics
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2 / 60

If the volume of a gas is fixed then on increasing its temperature, its pressure______

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3 / 60

The bicycle pump works on the basis of:

NUMS 2020
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4 / 60

All the heat supplied to a system is converted into work in the ______ process.

NTS 2016 DUHS & JSMU
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5 / 60

The efficiency of the Carnot engine working between temperatures 177°C and 77°C will be:

NTS 2018
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6 / 60

A fixed mass of an ideal gas absorbs 1000 J of heat and expands under a constant pressure of 20 kPa from a volume of 25 x 10-3 m3 to a volume of 50 x 10-3 m3. What is the change in the internal energy of the gas?

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7 / 60

As a result of the natural process the entropy

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If N, m, V and c represent the number of molecules, mass of a molecule, volume of cubical container and speed of a molecule respectively then by using the method dimensions, check which of the following expressions represents the pressure (p) of a gas?

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9 / 60

The quantity of heat required to raise the temperature of one mole of a substance through 1 K is called:

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10 / 60

Kelvin, the unit of thermodynamic temperature is _____ of the thermodynamic temperature of the triple point of water.

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11 / 60

Absolute zero is equivalent to:

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12 / 60

If constant temperature conditions are applied to a gas container, then the volume of the mass of that gas tends to increase by:

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13 / 60

For adiabatic process, the first law of thermodynamics is:

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14 / 60

If Cp = 10 & Cv = 7, then the general gas constant equals:

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Entropy is the measure of of a system

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Kelvin, is the unit of thermodynamic temperature, which is ________ of the thermodynamic temperature of the triple point of water.

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17 / 60

If the temperature of cold reservoir is 12C and that of hot reservoir is 27C, the efficiency of Carnet Engine • All be?

18 / 60

If an ideal gas has volume V at 27 C and it is heated at constant pressure so that its volume becomes 1.5 V, then the value of final temperature is:

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19 / 60

The rapid escape of air from a burst tyre is an example of:

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20 / 60

The equation ΔU = ΔQ refers to:

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21 / 60

The amount of heat at constant volume is called as:

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22 / 60

With the usual notation, the first law of thermodynamics applied to one mole of an ideal gas can be written in the following form:

CvΔT=ΔQ – PΔV

In a change for which Boyle’s law is obeyed, which of the following would necessarily be zero?

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23 / 60

For one mole of gas, the relation for specific heat capacity at constant pressure ‘Cp’ and at constant volume ‘Cv’ is ________.

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24 / 60

The internal energy of a system during an isothermal process:

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25 / 60

The value of universal constant “R” is:

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26 / 60

The amount of heat provided to a system at constant pressure (qp) is equal to _______.

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27 / 60

A system absorbs 1000 Joules of heat and delivers 600 Joules of work, while losing 100 Joules of heat by conduction to the atmosphere, the change in the internal energy of the system will be:

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28 / 60

According to the first law of thermodynamics, ΔU = Q + W, where ΔU Is the increase in internal energy of the system, Q is the heat transferred to the system and W is the external work done on the system.
Which of the following is NOT a correct expression?

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29 / 60

In which process the entire heat supplied to the gas is converted to the internal energy of the gas?

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30 / 60

According to kinetic theory,

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31 / 60

If speed of a fan in a room is Increased then the temperature of air in the room will

32 / 60

In a certain process, 400 J of heat energy is supplied to a system and at the same time 150 J of work is done by the system. The increase in internal energy of the system is _______.

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33 / 60

22320 cal heat is supplied to 100g of ice at zero degree centigrade. If the latent heat of fusion of ice is 80 cal /g and latent heat of vaporization of water is 540 cal/g the final amount of water thus obtained and its temperature respectively are:

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34 / 60

A copper wire has resistances 10 ohms and 20 ohms at temperature 0 C and 10 C respectively. What is the temperature coefficient of the copper wire?

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35 / 60

The temperature coefficient of normal-conductor is negative because:

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36 / 60

Compression of gas under constant temperature is process:

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Conversion of heat energy completely into work violates:

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38 / 60

A fixed mass of gas in a thermally insulated container is compressed. After compression, the temperature of the gas will have:

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39 / 60

If the temperature is increased from 200K to 800K, then what would be the change in pressure at constant volume?

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40 / 60

The entropy of the universe always:

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41 / 60

Law of heat exchange is used to determine:

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42 / 60

How much heat is absorbed by 100 g of water when its temperature decreases from 25. C to 5. C? (heat capacity is 4.2 j/gk)

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43 / 60

“At constant pressure, the volume of gas is directly proportional to Absolute Temperature” this is known as?

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44 / 60

Find the heat transferred to or from the system when a thermodynamics system undergoes a process in which its internal energy decreases by 300 J. If at the same time, 120 J of work is done on the system.

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45 / 60

22320 cal heat is supplied to 100g of ice at zero degree centigrade. If the latent heat of fusion of ice is 80 cal /g and latent heat of vaporization of water is 540 cal/g the final amount of water thus obtained and its temperature respectively are:

NUMS 2014
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46 / 60

A thermocouple is immersed in water at 373 K and the other in ice at 273K. The emf of the thermocouple Is 90 (μ)V for each 1 K difference in temperature between junctions, and the thermocouple resistance is 6 Ω. What current will flow in the galvanometer connected in series with an internal resistance of 30ohms?

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47 / 60

The temperature of a body at 100 °C is increased by Δ𝛉 as measured on the Celsius scale. How is this temperature change expressed on the Kelvin scale?

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48 / 60

When earthquake occurs. What happens to the entropy of Earth?

49 / 60

A sample of an ideal gas may : expand adiabatically or expand isothermally. The net flow of heat into the gas from the exterior is:

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50 / 60

As the temperature of the black body is raised, the black body radiations become richer in:

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51 / 60

The sum of all forms of molecular energies in a thermodynamic system is known as:

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52 / 60

Which of the ,following act as a heat pump?

53 / 60

Refrigerator is an example of:

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54 / 60

Efficiency of the Carnot’s cycle will be 100% if the temperature of cold reservoir is:

55 / 60

Bimetallic thermostat is an example of:

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56 / 60

A steel rod has a length of 15 m at a temperature of 30°C. If the temperature is raised to 45°C. The increase in its length is:

(α= 1.1 x 10-5 K-1)

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57 / 60

A frictional piston-cylinder based enclosure contains some amount of gas at a pressure of 400k Pa. Then heat is pressure in a quasi-static process. The piston moves up slowly through a height of 10cm. lf the piston has across section area of 0.3m2,the work done by the gas in the process is:

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58 / 60

During isothermal process which of the following remains constant:

59 / 60

Entropy on melting of ice

60 / 60

The efficiency of the carnot’s Engine Working between 150°C and 50°C is:

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Physics
Heat and Thermodynamics
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