2021
JEE Mains
MCQ
JEE Main 2021 (Online) 26th August Evening Shift
A refrigerator consumes an average 35W power to operate between temperature $-$10$^\circ$C to 25$^\circ$C. If there is no loss of energy then how much average heat per second does it transfer?
A.
263 J/s
B.
298 J/s
C.
350 J/s
D.
35 J/s
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 26th August Morning Shift
An electric appliance supplies 6000 J/min heat to the system. If the system delivers a power of 90W. How long it would take to increase the internal energy by 2.5 $\times$ 103 J ?
A.
2.5 $\times$ 102 s
B.
4.1 $\times$ 101 s
C.
2.4 $\times$ 103 s
D.
2.5 $\times$ 101 s
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 26th August Morning Shift
The rms speeds of the molecules of Hydrogen, Oxygen and Carbon dioxide at the same temperature are VH, VO and VC respectively then :
A.
VH > VO > VC
B.
VC > VO > VH
C.
VH = VO > VC
D.
VH = VO = VC
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 27th July Evening Shift
One mole of an ideal gas is taken through an adiabatic process where the temperature rises from 27$^\circ$ C to 37$^\circ$ C. If the ideal gas is composed of polyatomic molecule that has 4 vibrational modes, which of the following is true? [R = 8.314 J mol$-$1 k$-$1]
A.
work done by the gas is close to 332 J
B.
work done on the gas is close to 582 J
C.
work done by the gas is close to 582 J
D.
work done on the gas is close to 332 J
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 27th July Evening Shift
Two Carnot engines A and B operate in series such that engine A absorbs heat at T1 and rejects heat to a sink at temperature T. Engine B absorbs half of the heat rejected by Engine A and rejects heat to the sink at T3. When workdone in both the cases is equal, to value of T is :
A.
${2 \over 3}{T_1} + {3 \over 2}{T_3}$
B.
${1 \over 3}{T_1} + {2 \over 3}{T_3}$
C.
${3 \over 2}{T_1} + {1 \over 3}{T_3}$
D.
${2 \over 3}{T_1} + {1 \over 3}{T_3}$
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 27th July Morning Shift
The number of molecules in one litre of an ideal gas at 300 K and 2 atmospheric pressure with mean kinetic energy 2 $\times$ 10$-$9 J per molecules is :
A.
0.75 $\times$ 1011
B.
3 $\times$ 1011
C.
1.5 $\times$ 1011
D.
6 $\times$ 1011
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 27th July Morning Shift
In the reported figure, there is a cyclic process ABCDA on a sample of 1 mol of a diatomic gas. The temperature of the gas during the process A $\to$ B and C $\to$ D are T1 and T2 (T1 > T2) respectively.
Choose the correct option out of the following for work done if processes BC and DA are adiabatic.
Choose the correct option out of the following for work done if processes BC and DA are adiabatic.
A.
WAB = WDC
B.
WAD = WBC
C.
WBC + WDA > 0
D.
WAB < WCD
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th July Evening Shift
A heat engine has an efficiency of ${1 \over 6}$. When the temperature of sink is reduced by 62$^\circ$C, its efficiency get doubled. The temperature of the source is :
A.
124$^\circ$C
B.
37$^\circ$C
C.
62$^\circ$C
D.
99$^\circ$C
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th July Morning Shift
For a gas CP $-$ CV = R in a state P and CP $-$ CV = 1.10 R in a state Q, TP and TQ are the temperatures in two different states P and Q respectively. Then
A.
TP = TQ
B.
TP < TQ
C.
TP = 0.9 TQ
D.
TP > TQ
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th July Morning Shift
A monoatomic ideal gas, initially at temperature T1 is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature T2 by releasing the piston suddenly. If l1 and l2 are the lengths of the gas column, before and after the expansion respectively, then the value of ${{{T_1}} \over {{T_2}}}$ will be :
A.
${\left( {{{{l_1}} \over {{l_2}}}} \right)^{{2 \over 3}}}$
B.
${\left( {{{{l_2}} \over {{l_1}}}} \right)^{{2 \over 3}}}$
C.
${{{l_2}} \over {{l_1}}}$
D.
${{{l_1}} \over {{l_2}}}$
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th July Morning Shift
Two different metal bodies A and B of equal mass are heated at a uniform rate under similar conditions. The variation of temperature of the bodies is graphically represented as shown in the figure. The ratio of specific heat capacities is :
A.
${8 \over 3}$
B.
${3 \over 8}$
C.
${3 \over 4}$
D.
${4 \over 3}$
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 22th July Evening Shift
What will be the average value of energy for a monoatomic gas in thermal equilibrium at temperature T?
A.
${3 \over 2}{k_B}T$
B.
${k_B}T$
C.
${2 \over 3}{k_B}T$
D.
${1 \over 2}{k_B}T$
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 20th July Evening Shift
Which of the following graphs represent the behavior of an ideal gas? Symbols have their usual meaning.
A.
B.
C.
D.
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 20th July Evening Shift
The correct relation between the degrees of freedom f and the ratio of specific heat $\gamma$ is :
A.
$f = {2 \over {\gamma - 1}}$
B.
$f = {2 \over {\gamma + 1}}$
C.
$f = {{\gamma + 1} \over 2}$
D.
$f = {1 \over {\gamma + 1}}$
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 20th July Morning Shift
Consider a mixture of gas molecule of types A, B and C having masses mA < mB < mC. The ratio of their root mean square speeds at normal temperature and pressure is :
A.
${v_A} = {v_B} \ne {v_C}$
B.
${1 \over {{v_A}}} > {1 \over {{v_B}}} > {1 \over {{v_C}}}$
C.
${1 \over {{v_A}}} < {1 \over {{v_B}}} < {1 \over {{v_C}}}$
D.
${v_A} = {v_B} = {v_C} = 0$
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 20th July Morning Shift
The amount of heat needed to raise the temperature of 4 moles of rigid diatomic gas from 0$^\circ$ C to 50$^\circ$ C when no work is done is ___________. (R is the universal gas constant).
A.
500 R
B.
250 R
C.
750 R
D.
175 R
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 20th July Morning Shift
The entropy of any system is given by
$S = {\alpha ^2}\beta \ln \left[ {{{\mu kR} \over {J{\beta ^2}}} + 3} \right]$ where $\alpha$ and $\beta$ are the constants. $\mu$, J, k and R are no. of moles, mechanical equivalent of heat, Boltzmann constant and gas constant respectively.
[Take $S = {{dQ} \over T}$]
Choose the incorrect option from the following :
$S = {\alpha ^2}\beta \ln \left[ {{{\mu kR} \over {J{\beta ^2}}} + 3} \right]$ where $\alpha$ and $\beta$ are the constants. $\mu$, J, k and R are no. of moles, mechanical equivalent of heat, Boltzmann constant and gas constant respectively.
[Take $S = {{dQ} \over T}$]
Choose the incorrect option from the following :
A.
$\alpha$ and J have the same dimensions.
B.
S and $\alpha$ have different dimensions
C.
S, $\beta$, k and $\mu$R have the same dimensions
D.
$\alpha$ and k have the same dimensions
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 18th March Evening Shift
Consider a sample of oxygen behaving like an ideal gas. At 300 K, the ratio of root mean square (rms) velocity to the average velocity of gas molecule would be :
(Molecular weight of oxygen is 32g/mol; R = 8.3 J K$-$1 mol$-$1)
(Molecular weight of oxygen is 32g/mol; R = 8.3 J K$-$1 mol$-$1)
A.
$\sqrt {{{3\pi } \over 8}} $
B.
$\sqrt {{3 \over 3}} $
C.
$\sqrt {{8 \over 3}} $
D.
$\sqrt {{{8\pi } \over 3}} $
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 18th March Evening Shift
For an adiabatic expansion of an ideal gas, the fractional change in its pressure is equal to (where $\gamma$ is the ratio of specific heats) :
A.
$ - {1 \over \gamma }{{dV} \over V}$
B.
$ - \gamma {V \over {dV}}$
C.
$ - \gamma {{dV} \over V}$
D.
${{dV} \over V}$
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 18th March Evening Shift
An ideal gas in a cylinder is separated by a piston in such a way that the entropy of one part is S1 and that of the other part is S2. Given that S1 > S2. If the piston is removed then the total entropy of the system will be :
A.
S1 $-$ S2
B.
${{{S_1}} \over {{S_2}}}$
C.
S1 $\times$ S2
D.
S1 + S2
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 18th March Morning Shift
The P-V diagram of a diatomic ideal gas system going under cyclic process as shown in figure. The work done during an adiabatic process CD is (use $\gamma$ = 1.4) :
A.
$-$500 J
B.
$-$400 J
C.
400 J
D.
200 J
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 18th March Morning Shift
What will be the average value of energy along one degree of freedom for an ideal gas in thermal equilibrium at a temperature T? (kB is Boltzmann constant)
A.
${1 \over 2}{k_B}T$
B.
${2 \over 3}{k_B}T$
C.
${3 \over 2}{k_B}T$
D.
${k_B}T$
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 17th March Evening Shift
If one mole of the polyatomic gas is having two vibrational modes and $\beta$ is the ratio of molar specific heats for polyatomic gas $\left( {\beta = {{{C_P}} \over {{C_V}}}} \right)$ then the value of $\beta$ is :
A.
1.02
B.
1.35
C.
1.2
D.
1.25
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 17th March Evening Shift
Which one is the correct option for the two different thermodynamic processes?
A.
(a) only
B.
(c) and (d)
C.
(b) and (c)
D.
(c) and (a)
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 17th March Morning Shift
A polyatomic ideal gas has 24 vibrational modes. What is the value of $\gamma$?
A.
1.37
B.
1.30
C.
1.03
D.
10.3
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 17th March Morning Shift
Two ideal polyatomic gases at temperatures T1 and T2 are mixed so that there is no loss of energy. If F1 and F2, m1 and m2, n1 and n2 be the degrees of freedom, masses, number of molecules of the first and second gas respectively, the temperature of mixture of these two gases is :
A.
${{{n_1}{F_1}{T_1} + {n_2}{F_2}{T_2}} \over {{F_1} + {F_2}}}$
B.
${{{n_1}{F_1}{T_1} + {n_2}{F_2}{T_2}} \over {{n_1}{F_1} + {n_2}{F_2}}}$
C.
${{{n_1}{T_1} + {n_2}{T_2}} \over {{n_1} + {n_2}}}$
D.
${{{n_1}{F_1}{T_1} + {n_2}{F_2}{T_2}} \over {{n_1} + {n_2}}}$
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 17th March Morning Shift
Two identical metal wires of thermal conductivities K1 and K2 respectively are connected in series. The effective thermal conductivity of the combination is :
A.
${{2{K_1}{K_2}} \over {{K_1} + {K_2}}}$
B.
${{{K_1} + {K_2}} \over {{K_1}{K_2}}}$
C.
${{{K_1} + {K_2}} \over {2{K_1}{K_2}}}$
D.
${{{K_1}{K_2}} \over {{K_1} + {K_2}}}$
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 17th March Morning Shift
A Carnot's engine working between 400 K and 800 K has a work output of 1200 J per cycle. The amount of heat energy supplied to the engine from the source in each cycle is :
A.
2400 J
B.
1600 J
C.
1800 J
D.
3200 J
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 16th March Evening Shift
Calculate the value of mean free path ($\lambda$) for oxygen molecules at temperature 27$^\circ$C and pressure 1.01 $\times$ 105 Pa. Assume the molecular diameter 0.3 nm and the gas is ideal. (k = 1.38 $\times$ 10$-$23 JK$-$1)
A.
32 nm
B.
58 nm
C.
86 nm
D.
102 nm
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 16th March Evening Shift
A bimetallic strip consists of metals A and B. It is mounted rigidly as shown. The metal A has higher coefficient of expansion compared to that of metal B. When the bimetallic strip is placed in a cold bath, it will :
A.
Neither bend nor shrink
B.
Bend towards the left
C.
Not bend but shrink
D.
Bend towards the right
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 16th March Morning Shift
In thermodynamics, heat and work are :
A.
Path functions
B.
Point functions
C.
Extensive thermodynamics state variables
D.
Intensive thermodynamic state variables
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 16th March Morning Shift
The volume V of an enclosure contains a mixture of three gases, 16 g of oxygen, 28 g of nitrogen and 44 g of carbon dioxide at absolute temperature T. Consider R as universal gas constant. The pressure of the mixture of gases is :
A.
${{3RT} \over V}$
B.
${{4RT} \over V}$
C.
${{88RT} \over V}$
D.
${5 \over 2}{{RT} \over V}$
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 26th February Evening Shift
The internal energy (U), pressure (P) and volume (V) of an ideal gas are related as U $=$ 3PV + 4. The gas is :
A.
either monoatomic or diatomic.
B.
monoatomic only.
C.
polyatomic only.
D.
diatomic only.
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 26th February Morning Shift
The temperature $\theta$ at the junction of two insulating sheets, having thermal resistances R1 and R2 as well as top and bottom temperatures $\theta$1 and $\theta$2 (as shown in figure) is given by :
A.
${{{\theta _1}{R_2} + {\theta _2}{R_1}} \over {{R_1} + {R_2}}}$
B.
${{{\theta _1}{R_1} + {\theta _2}{R_2}} \over {{R_1} + {R_2}}}$
C.
${{{\theta _1}{R_2} - {\theta _2}{R_1}} \over {{R_2} - {R_1}}}$
D.
${{{\theta _2}{R_2} - {\theta _1}{R_1}} \over {{R_2} - {R_1}}}$
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th February Evening Shift
Given below are two statements :
Statement I : In a diatomic molecule, the rotational energy at a given temperature obeys Maxwell's distribution.
Statement II : In a diatomic molecule, the rotational energy at a given temperature equals the translational kinetic energy for each molecule.
In the light of the above statements, choose the correct answer from the options given below :
Statement I : In a diatomic molecule, the rotational energy at a given temperature obeys Maxwell's distribution.
Statement II : In a diatomic molecule, the rotational energy at a given temperature equals the translational kinetic energy for each molecule.
In the light of the above statements, choose the correct answer from the options given below :
A.
Both Statement I and Statement II are true
B.
Both Statement I and Statement II are false
C.
Statement I is true but Statement II is false.
D.
Statement I is false but Statement II is true.
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th February Evening Shift
Thermodynamic process is shown below on a P-V diagram for one mole of an ideal gas. If V2 = 2V1 then the ratio of temperature T2/T1 is :
A.
$\sqrt 2 $
B.
${1 \over {\sqrt 2 }}$
C.
${1 \over 2}$
D.
2
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th February Morning Shift
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : When a rod lying freely is heated, no thermal stress is developed in it.
Reason R : On heating, the length of the rod increases.
In the light of the above statements, choose the correct answer from the options given below :
Assertion A : When a rod lying freely is heated, no thermal stress is developed in it.
Reason R : On heating, the length of the rod increases.
In the light of the above statements, choose the correct answer from the options given below :
A.
A is true but R is false
B.
A is false but R is true
C.
Both A and B are true but R is NOT the correct explanation of A
D.
Both A and R are true and R is the correct explanation of A
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th February Morning Shift
A diatomic gas, having ${C_p} = {7 \over 2}R$ and ${C_v} = {5 \over 2}R$, is heated at constant pressure. The ratio dU : dQ : dW :
A.
5 : 7 : 3
B.
3 : 7 : 2
C.
5 : 7 : 2
D.
3 : 5 : 2
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 24th February Evening Shift
If one mole of an ideal gas at (P1, V1) is allowed to expand reversibly and isothermally (A to B) its pressure is reduced to one-half of the original pressure (see figure). This is followed by a constant volume cooling till its pressure is reduced to one-fourth of the initial value (B $ \to $ C). Then it is restored to its initial state by a reversible adiabatic compression (C to A). The net workdone by the gas is equal to :
A.
$ - {{RT} \over {2(\gamma - 1)}}$
B.
$RT\left( {\ln 2 - {1 \over {2(\gamma - 1)}}} \right)$
C.
$RT\ln 2$
D.
$0$
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 24th February Evening Shift
On the basis of kinetic theory of gases, the gas exerts pressure because its molecules :
A.
continuously lose their energy till it reaches wall.
B.
are attracted by the walls of container.
C.
suffer change in momentum when impinge on the walls of container.
D.
continuously stick to the walls of container.
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 24th February Morning Shift
Match List I with List II.
Choose the correct answer from the options given below :
| List I | List II | ||
|---|---|---|---|
| (a) | Isothermal | (i) | Pressure constant |
| (b) | Isochoric | (ii) | Temperature constant |
| (c) | Adiabatic | (iii) | Volume constant |
| (d) | Isobaric | (iv) | Heat content is constant |
Choose the correct answer from the options given below :
1.
(a) - (ii), (b) - (iii), (c) - (iv), (d) - (i)
2.
(a) - (ii), (b) - (iv), (c) - (iii), (d) - (i)
3.
(a) - (iii), (b) - (ii), (c) - (i), (d) - (iv)
4.
(a) - (i), (b) - (iii), (c) - (ii), (d) - (iv)
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 24th February Morning Shift
n mole of a perfect gas undergoes a cyclic process ABCA (see figure) consisting of the following processes.
A $ \to $ B : Isothermal expansion at temperature T so that the volume is doubled from V1 to V2 = 2V1 and pressure charges from P1 to P2
B $ \to $ C : Isobaric compression at pressure P2 to initial volume V1.
C $ \to $ A : Isochoric change leading to change of pressure from P2 to P1.
Total workdone in the complete cycle ABCA is :
A $ \to $ B : Isothermal expansion at temperature T so that the volume is doubled from V1 to V2 = 2V1 and pressure charges from P1 to P2
B $ \to $ C : Isobaric compression at pressure P2 to initial volume V1.
C $ \to $ A : Isochoric change leading to change of pressure from P2 to P1.
Total workdone in the complete cycle ABCA is :
A.
nRTln 2
B.
0
C.
$nRT\left( {\ln 2 - {1 \over 2}} \right)$
D.
$nRT\left( {\ln 2 + {1 \over 2}} \right)$
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 24th February Morning Shift
Each side of a box made of metal sheet in cubic shape is 'a' at room temperature 'T', the coefficient of linear expansion of the metal sheet is '$\alpha$'. The metal sheet is heated uniformly, by a small temperature $\Delta$T, so that its new temperature is T + $\Delta$T. Calculate the increase in the volume of the metal box.
A.
3a3$\alpha$$\Delta$T
B.
4$\pi$a3$\alpha$$\Delta$T
C.
${{4 \over 3}}$$\pi$a3$\alpha$$\Delta$T
D.
4a3$\alpha$$\Delta$T
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 6th September Evening Slot
In a dilute gas at pressure P and temperature T, the mean time between successive collisions of a
molecule varies with T as :
A.
$\sqrt T $
B.
T
C.
${1 \over T}$
D.
${1 \over {\sqrt T }}$
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 6th September Evening Slot
Three rods of identical cross-section and lengths are made of three different materials of thermal
conductivity K1
, K2
and K3
, respecrtively. They are joined together at their ends to make a long rod
(see figure). One end of the long rod is maintained at 100oC and the other at 0oC (see figure). If
the joints of the rod are at 70oC and 20oC in steady state and there is no loss of energy from the
surface of the rod, the correct relationship between K1
, K2
and K3
is :
A.
K1 : K3 = 2 : 3,
K2 : K3 = 2 : 5
K2 : K3 = 2 : 5
B.
K1 < K2 < K3
C.
K1 : K2 = 5 : 2,
K1 : K3 = 3 : 5
K1 : K3 = 3 : 5
D.
K1 > K2 > K3
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 6th September Morning Slot
Molecules of an ideal gas are known to have three translational degrees of freedom and two
rotational degrees of freedom.The gas is maintained at a temperature of T. The total internal
energy, U of a mole of this gas, and the value of
$\gamma \left( { = {{{C_p}} \over {{C_v}}}} \right)$ are given, respectively by:
$\gamma \left( { = {{{C_p}} \over {{C_v}}}} \right)$ are given, respectively by:
A.
U = ${5 \over 2}RT$ and $\gamma = {7 \over 5}$
B.
U = 5RT and $\gamma = {6 \over 5}$
C.
U = 5RT and $\gamma = {7 \over 5}$
D.
U = ${5 \over 2}RT$ and $\gamma = {6 \over 5}$
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 5th September Evening Slot
In an adiabatic process, the density of a
diatomic gas becomes 32 times its initial value.
The final pressure of the gas is found to be n
times the initial pressure. The value of n is :
A.
128
B.
32
C.
326
D.
${1 \over {32}}$
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 5th September Evening Slot
Two different wires having lengths L1 and L2,
and respective temperature coefficient of linear
expansion $\alpha $1 and $\alpha $2, are joined end-to-end.
Then the effective temperature coefficient of
linear expansion is :
A.
$2\sqrt {{\alpha _1}{\alpha _2}} $
B.
$4{{{\alpha _1}{\alpha _2}} \over {{\alpha _1} + {\alpha _2}}}{{{L_2}{L_1}} \over {{{\left( {{L_2} + {L_1}} \right)}^2}}}$
C.
${{{\alpha _1} + {\alpha _2}} \over 2}$
D.
${{{\alpha _1}{L_1} + {\alpha _2}{L_2}} \over {{L_1} + {L_2}}}$
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 5th September Morning Slot
Three different processes that can occur in an
ideal monoatomic gas are shown in the P vs V
diagram. The paths are labelled as A $ \to $ B,
A $ \to $ C and A $ \to $ D. The change in internal
energies during these process are taken as
EAB, EAC and EAD and the work done as WAB,
WAC and WAD.
The correct relation between these parameters are :
The correct relation between these parameters are :
A.
EAB < EAC < EAD, WAB > 0, WAC > WAD
B.
EAB = EAC = EAD, WAB > 0, WAC = 0, WAD < 0
C.
EAB > EAC > EAD, WAB < WAC < WAD
D.
EAB = EAC < EAD, WAB > 0, WAC = 0, WAD < 0
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 5th September Morning Slot
Number of molecules in a volume of 4 cm3 of
a perfect monoatomic gas at some temperature
T and at a pressure of 2 cm of mercury is close
to?
(Given, mean kinetic energy of a molecule
(at T) is 4 $ \times $ 10–14 erg, g = 980 cm/s2, density of
mercury = 13.6 g/cm3)
(Given, mean kinetic energy of a molecule
(at T) is 4 $ \times $ 10–14 erg, g = 980 cm/s2, density of
mercury = 13.6 g/cm3)
A.
5.8 $ \times $ 1018
B.
4.0 $ \times $ 1016
C.
5.8 $ \times $ 1016
D.
4.0 $ \times $ 1018