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Heat and Thermodynamics

Physics

Previous Years Questions

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Three vessels of equal capacity have gases at the same temperature and pressure. The first vessel contains helium (monoa...
NEET 2022 Phase 2
Two rods one made of copper and other made of steel of same length and same cross sectional area are joined together. Th...
NEET 2022 Phase 2
An ideal gas follows a process described by the equation $$P{V^2} = C$$ from the initial $$({P_1},\,{V_1},\,{T_1})$$ to ...
NEET 2022 Phase 2
The volume occupied by the molecules contained in 4.5 kg water at STP, if the intermolecular forces vanish away is...
NEET 2022
An ideal gas undergoes four different processes from the same initial state as shown in the figure below. Those processe...
NEET 2022
Match Column - I and Column - II and choose the correct match from the given choices. Column - I C...
NEET 2021
A cup of coffee cools from 90$$^\circ$$C to 80$$^\circ$$C in t minutes, when the room temperature is 20$$^\circ$$C. The ...
NEET 2021
Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard...
NEET 2020 Phase 1
The quantities of heat required to raise the temperature of two solid copper spheres of radii r1 and r2 (r1 = 1.5r2) thr...
NEET 2020 Phase 1
A cylinder contains hydrogen gas at pressure 249 kPa and temperature 27$$^\circ$$CIts density is : (R = 8.3 J mol-1 K-1...
NEET 2020 Phase 1
The mean free path for a gas, with molecular diameter d and number density n can be expressed as :
NEET 2020 Phase 1
The average thermal energy for a mono-atomic gas is : (kB is Boltzmann constant and T absolute temperature)
NEET 2020 Phase 1
Increase in tempertaure of a gas filled in a container would lead to :
NEET 2019
In which of the following processes, heat is neither absorbed nor released by a system?
NEET 2019
At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the Earth’s atmosphe...
NEET 2018
The volume (V) of a monatomic gas varies with its temperature (T), as shown in the graph. The ratio of work done by the ...
NEET 2018
A sample of 0.1 g of water at 100°C and normal pressure (1.013 × 105 N m–2) requires 54 cal of heat energy to convert t...
NEET 2018
The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is
NEET 2018
A gas mixture consists of 2 moles of O2 and 4 moles of Ar at temperature T. Neglecting all vibrational modes, the total ...
NEET 2017
A carnot engine having an efficiency of $${1 \over {10}}$$ as heat engine, is used as a refrigerator. If the work done o...
NEET 2017
Thermodynamic processes are indicated in the following diagram. Match the following .tg {border-collapse:collapse;bor...
NEET 2017
A refrigerator works between 4oC and 30oC. It is required to remove 600 calories of heat every second in order to keep t...
NEET 2016 Phase 1
The molecules of a given mass of a gas have r.m.s. velocity of 2000 m s$$-$$1 at 27oC and 1.0 $$\times$$ 105 N m$$-$$2...
NEET 2016 Phase 1
A given sample of an ideal gas occupies a volume V at a pressure P and absolute temperature T. The mass of each molecule...
NEET 2016 Phase 2
A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic ...
NEET 2016 Phase 1
The temperature inside a refrigerator is t2 oC. The amount of heat delivered to the room for each joule of electrical en...
NEET 2016 Phase 2
One mole of an ideal monatomic gas undergoes a process described by the equation PV3 = constant. The heat capacity of th...
NEET 2016 Phase 2
One mole of an ideal diatomic gas undergoes a transition from A to B along a path AB as shown in the figure. The chang...
AIPMT 2015 Cancelled Paper
Figure below shows two paths that may be taken by a gas to go from a state A to a state C. In process AB, 400 J of heat...
AIPMT 2015 Cancelled Paper
A Carnot engine, having an efficiency of as heat engine, is used as a refrigerator. If the work done on the system is 10...
AIPMT 2015 Cancelled Paper
The ratio of the specific heats $${{{C_p}} \over {{C_v}}} = \gamma$$ in terms of degrees of freedom (n) is given by
AIPMT 2015 Cancelled Paper
Two vessels separately contain two ideal gases A and B at the same temperature, the pressure of A being twice that of B....
AIPMT 2015
The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is $$-$$20oC, the temperature o...
AIPMT 2015
An ideal gas is compressed to half its initial volume by means of several processes. Which of the process results in th...
AIPMT 2015
The mean free path of molecules of a gas, (radius r) is inversely proportional to
AIPMT 2014
A thermodynamic system undergoes cyclic process ABCDA as shown in figure. The work done by the system in the cycle is ...
AIPMT 2014
A monatomic gas at a pressure P, having a volume V expands isothermally to a volume 2V and then adiabatically to a volum...
AIPMT 2014
In a vessel, the gas is at pressure P. If the mass of all the molecules is halved and their speed is doubled, then the r...
NEET 2013 (Karnataka)
Two Carnot engines A and B are operated in series. The engine A receives heat from the source at temperature T1 and reje...
NEET 2013 (Karnataka)
A system is taken from state a to state c by two paths adc and abc as shown in the figure. The internal energy at a is \$...
NEET 2013 (Karnataka)
Which of the following relations does not give the equation of an adiabatic process, where terms have their usual meanin...
NEET 2013 (Karnataka)
During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio...
NEET 2013
A gas is taken through the cycle A $$\to$$ B $$\to$$ C $$\to$$ A, as shown. what is the net work done by the gas...
NEET 2013
In the given (V $$-$$ T) diagram, what is the relation between pressure P1 and P2? ...
NEET 2013
The amount of heat energy required to raise the temperature of 1 g of Helium at NTP, from T1K to T2K is ...
NEET 2013
A thermodynamic system is taken through the cycle ABCD as shown in figure. Heat rejected by the gas during the cycle is...
AIPMT 2012 Prelims
An ideal gas goes from state A to state B via three different processes as indicated in the P-V diagram. If Q1, Q2, Q3 ...
AIPMT 2012 Mains
One mole of an ideal gas goes from an initial state A to final state B via two processes : It first undergoes isothermal...
AIPMT 2012 Prelims
When 1 kg of ice at 0oC melts to water at 0oC, the resulting change in its entropy, taking latent heat of ice to be 80 ...
AIPMT 2011 Prelims
A mass of diatomic gas $$(\gamma = 1.4)$$ at a pressure of 2 atmospheres is compressed adiabatically so that its temper...
AIPMT 2011 Mains
During an isothermal expansion, a confined ideal gas does $$-$$ 150 J of work against its surroundings. This implies tha...
AIPMT 2011 Prelims
A monatomic gas at pressure P1 and volume V1 is compressed adiabatically to $${{1 \over 8}^{th}}$$ of its original volum...
AIPMT 2010 Mains
If cp and cv denote the specific heats (per unit mass of an ideal gas of molecular weight M, then
AIPMT 2010 Mains
If $$\Delta$$U and $$\Delta$$W represent the increase in internal energy and work done by the system respectively in a...
AIPMT 2010 Prelims
The internal energy change in a system that has absorbed 2 kcal of heat and done 500 J of work is
AIPMT 2009
In thermodynamic processes which of the following statements is not true ?
AIPMT 2009
If Q, E and W denote respectively the heat added, change in internal energy and the work done in a closed cyclic process...
AIPMT 2008
At 10oC the value of the density of a fixed mass of an ideal gas divided by it pressure is x. At 110oC this ratio is ...
AIPMT 2008
An engine has an efficiency of 1/6. When the temperature of sink is reduced by 62oC, its efficiency is doubled. Temperat...
AIPMT 2007
The molar specific heat at constant pressure of an ideal gas is (7/2) R. The ratio of specific heat at constant pressur...
AIPMT 2006
A Carnot engine whose sink is at 300 K has an efficiency of 40%. By how much should the temperature of source be increas...
AIPMT 2006
Which of the following processes is reversible?
AIPMT 2005
An ideal gas heat engine operates in Carnot cycle between 227oC and 127oC. It absorbs 6 $$\times$$ 104 cal of heat at ...
AIPMT 2005
One mole of an ideal gas at an initial temperature of T K does 6R joule of work adiabatically. If the ratio of specific ...
AIPMT 2004
The equation of state for 5 g of oxygen at a pressure P and temperature T, when occupying a volume V, will be (where R ...
AIPMT 2004
An ideal gas heat engine operates in a Carnot cycle between 227oC and 127oC. It absorbs 6 kcal at the height temperature...
AIPMT 2003
The efficiency of Carnot engine is 50% and temperature of sink is 500 K. If temperature of source is kept constant and i...
AIPMT 2002
A scientist says that the efficiency of his heat engine which work at source temperature 127oC and sink temperature 27oC...
AIPMT 2001
To find out degree of freedom, the expansion is
AIPMT 2000
The (W/Q) of a Carnot engine is 1/6, now the temperature of sink is reduced by 62oC, then this ratio becomes twice, ther...
AIPMT 2000

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