Question 1 :
When heat energy is given out by a hot substance then the kinetic energy of its molecules _________. Fill in the blank. <br/>
Question 2 :
Railway tracks have gaps between them to deal with expansion in :
Question 3 :
At equilibrium temperature, the rate of flow of heat energy from one body to the other and back is the same. Is the statement True or False
Question 4 :
State whether true or false :<br>During the change of state, the temperature does not change.
Question 5 :
<b></b>A body was supplied with $4\times 10^6$ mega joules. Express this heat is joules.
Question 7 :
Select from below, how are temperature and kinetic energy of molecules related to each other?<br/>
Question 8 :
Which physical quantity determines the direction of flow of heat energy?<br/>
Question 11 : The highest temperatures recorded in 4 different countries are listed below<table class="wysiwyg-table"><tbody><tr><td>Highest temperature</td><td>Country</td></tr><tr><td>127.6$^o$F</td><td>India</td></tr><tr><td>114.8$^o$F</td><td>Nepal</td></tr><tr><td>136.4$^o$F</td><td>Srilanka</td></tr><tr><td>134.0$^o$F</td><td>Pakistan</td></tr></tbody></table>What is the highest temperature listed above?
Question 12 :
When water is heated from 0 $^{\circ} C$ to 4$ ^{\circ} C$, it :
Question 13 :
Thermal expansion take place due to the ________ energy of the movement of the particles in a substance, forcing the particles further apart.
Question 16 :
One mole of ${O}_{2}$ gas having a volume equal to 22.4 liters at $0^oC$ and 1 atmospheric pressure is compressed isothermally so that its volume reduces to 11.2 liters. The work done in this process is then<br>
Question 17 :
In a given process, $$15 J$ of heat is added to an ideal gas and the gas does $7 J$ of work. Which of the following is true about the internal energy of the gas during this process?<br/>
Question 20 :
Air is expanded from $50$ liter to $150$ liter at $2$ atmospheric pressure ( $1$ atm = pressure =$10^{5} Pa$). The external work done is:
Question 21 :
A thermos bottle containing coffee is vigorously shaken. If the coffee is considered as a system, then the temperature of the coffee will ____________.
Question 22 :
In a thermodynamic process pressure of a fixed mass of a gas is changed in such a manner that the gas releases 20 J of heat and 8 J of work is done on the gas if the initial internal energy of the gas was 30 J. The final internal energy wilI be:
Question 26 :
Assertion (A) : According to the principle of conservation of energy all heat can be converted<br/>into mechanical work<br/>Reason (R) : Due to various losses, it is impossible to convert all heat into mechanical work.<br/>
Question 28 :
Select the option which describes the best definition of heat in the context of thermal energy?<br/>
Question 29 :
A gas expands 0.25 $\mathrm { m } ^ { 3 }$ at constant pressure 10$ ^ { 3 } \mathrm { N } / \mathrm { m } ^ { 2 } ,$ the work done is
Question 31 :
Identify which of the following statement does NOT apply to the First Law of Thermodynamics?<br/>
Question 32 :
The first law of thermodynamics is derived from which of the following law ? <br/>
Question 33 :
The quantity of heat energy required to change the temperature of one gram of water by one degree Celsius is known as<br>
Question 34 :
A thermodynamical system is changed from state $(P_1, V_1)$ to $(P_2, V_2)$ by two different processes, the quantity which will remain same will be
Question 35 :
Heating of a wheel on applying brakes is due to the relation
Question 36 :
State whether true or false :<br>Heat is a form of energy which produces feeling of hotness.
Question 37 :
If $1 cal = 4.2 J$, then $0.2 cal g^{-1} {\;}^oC^{-1}=......... J kg^{-1} K^{-1}$
Question 39 :
In a certain process $500\ cal$ of heat is given to a system and the system does $100\ J$ of work. The increase in internal energy of the system is
Question 41 :
State whether given statement is True or False<br/>Heat brings about a change in the state of matter.
Question 43 :
A gas obeying the equation of state $PV = RT$ undergoes a hypothetical reversible process described by the equation, $PV^{5/3}exp \left (-\dfrac {PV}{E_{0}}\right ) = C_{1}$ where $C_{1}$ and $E_{0}$ are dimensioned constants. Then, for this process, the thermal compressibility at high temperature.
Question 48 :
The mode of exchange of energy due to temperature difference is known as:<br/>
Question 49 :
Which of the following is true when a gas moves freely from one part to another part of rigid system?
Question 50 :
An unknown liquid at a high temperature is safely mixed with normal water until an equilibrium temperature is reached. Some heat is gained by the cold water. Identify by which of the following law this can be explained ?
Question 51 :
Which of the following is an example of the first law of thermodynamics ?
Question 52 :
If a system undergoes contraction of volume then the work done by the system will be
Question 53 :
Pressure P, volume V and temperature T for a certain gas are related by $p=\frac { AT-B{ T }^{ 2 }}{ V }$, where A and B are constants.The work done by the gas as its temperature change from ${ T }_{ 1 }$ to ${ T }_{ 2 }$ while pressure remaining constant is:
Question 54 :
How much heat energy will be required to increase the temperature of the vessel in part (a) from $25^{\circ}C$ to $35^{\circ}C$ ?
Question 55 :
Assertion: Work and heat are two equivalent from of energy
Reason: Work is the transfer of mechanical energy irrrespective of temperature difference, whereas heat is the transfer of thermal energy because of temperature difference only .
Question 56 :
A gas expands under constant pressure P from volume $V_{2}to V_{1}$. The work done by the gas is
Question 57 :
A gas is compressed at constant pressure $ 50 N/m^2$ from a volume of $ 0m^3$ to a volume $ 4m^3 . $ Energy $100 J$ is then added to the gas by heating. Its internal energy is :
Question 58 :
A container is filled with 20 moles of an ideal diatomic gas at absolute temperature T. When heat is supplied to gas temperature remains constant but 8 moles dissociate into atoms. Heat energy given to gas is
Question 59 :
For an ideal gas equation of a process for which the heat capacity of the gas varies with temperature as C = $\dfrac { \alpha }{ T }$ ($\alpha$ is a constant) is given by
Question 60 :
The specific heat of hydrogen gas at constant pressure is $C_{p} = 3.4 \times 10^{3} cal / kg ^{o}C$ and at constant volume is $C_{V} = 2.4 \times 10^{3} cal / kg ^{o}C$ If one kilogram hydrogen gas is heated from $10^{o} C$ to $ 20^{o} C$ at constant pressure, the external work done on the gas to maintain is at constant pressure is
Question 61 :
Assertion: The internal energy of an isothermal process does not change.
Reason: The internal energy of a system depend only on pressure of the system
Question 62 :
Work done on or by a gas, in genral depends upon the
Question 63 :
A steel drill is making $180$ Revolutions per minute, under a constant torque of $5 N-m$. If it drills a hole in $7 s$. in a steel block of mass $600 gm$, rise in temperature of the block is $(s= 0.1 cal/gm/ $ <br> ${^ \circ} C$)<br/>
Question 64 :
If heat is supplied to an ideal gas in an isothermal process,
Question 65 :
Assertion: First law of thermodynamics is a restatement of the<br>principle of conservation
Reason: Energy is fundamental quantity.
Question 66 :
Volume of one mole gas changes according to the $V = \dfrac{a}{T}$. If temperature change is $\Delta T$, then work done will be
Question 67 :
If $110$J of heat are added to a gaseous system, whose internal energy is $40$J, then the amount of external work done is?
Question 68 :
Internal energy of $ n_{1} $ mol of hydrogen of temperature $ T $ is equal to the internal energy of $ n_{2} $ mol of helium at temperature $ 2 T . $ The ratio $\dfrac{ n_{1} }{ n_{2}} $ is
Question 69 :
A block of mass $500 \,g$ and specific heat $400 \,J/kg \,K$ is attached with a spring of spring constant $800 \,N/m$. Now block is dipped in water of mass $1 \,kg$ and specific heat $4184 \,J/kg \,K$. Now the spring is elongated by $2m$ and released. Find rise in temperature of water and block system when block finally comes to rest.
Question 70 :
Consider the following two statements and choose the correct answer :<br>A) If heat is added to a system its temperature must always increase<br>B) If positive work is done by a system in thermodynamic process its volume must increase.<br>
Question 71 :
Find the external work done by the system inkcal, when 20 keal of heat is supplied to thesystem and the increase in the internal energy is 8400$\mathrm { J } ( \mathrm { J } = 4200 \mathrm { J } / \mathrm { kcal } ) ?$
Question 72 :
Two cylinders $A$ and $B$ fitted with pistons contain equal amounts of an ideal diatomic gas at $300\ K$. The piston of $A$ is free to move, while that of $B$ is held fixed. The same amount of heat is given to the gas in each cylinder. If the rise in temperature of the gas in $A$ is $30\ K$, then the rise in temperature of the gas in $B$ is<br>
Question 74 :
STATEMENT-1: There is a natural asymmetry between converting work to heat and converting heat to work.<br/><br/>STATEMENT-2: No process is possible in which the sole result is the absorption of heat from a reservoir and its complete conversion into work.
Question 75 :
An ideal gas is subjected to cyclic process involving four thermodynamic states, the amounts of heat (Q) and work (W) involved in each of these states are<br>$Q_1\,=\,6000\,J,$<br>$Q_2\,=\,-\,5500\,J;$<br>$Q_3\,=\,-\,3000\,J;$<br>$Q_4\,=\,3500\,J$<br>$W_1\,=\,2500\,J;$<br>$W_2\,=\,-\,1000\,J;$<br>$W_3\,=\,-\,1200\,J;$<br> $W_4\,=\,x\,J.$<br>The ratio of the net work done by the gas to the total heat absorbed by the gas is . The values of $\times$ and $\eta$ respectively are<br>
Question 76 :
A thermally insulated rigid container contains an ideal gas. It is heated through a resistance coil of 100$\Omega $ by passing a current of 1 A for five minutes, then change in internal energy of the gas is<br/>
Question 77 :
Two identical containers $ A $ and $ B $ have frictionless pistons. They contain the same volume of an ideal gas at the same temperature. The mass of the gas in $ A $ is $ m_{A} $ and that in $ B $ is $ m_{B} $. The gas in each cylinder is now allowed to expand isothermally to double the initial volume. The change in the pressure in $ A $ and $ B $, respectively, is $ \Delta p $ and $ 1.5 \Delta p $ Then
Question 78 :
An iron block of mass $2\;kg$, falls from a height of $10m$. After colliding with the ground it loses $25\%$ energy to surroundings and rest is gained as heat. Then find the temperature rise of the block. (Take sp. heat of iron $470\;J/kg^{\circ}C$)<br/>
Question 79 :
In a thermodynamic process pressure of a fixed mass of a gas is changed in such a manner that the gas releases $20J$ of heat and $8J$ of work is done on the gas. If initial internal energy of the gas was $30J$, what will be the fixed internal energy?
