# NEET Questions Solved

Concept Videos :-

#1 | Basic Terms of Thermodynamics
#2 | Zeroth Law

Concept Questions :-

Basic terms

Difficulty Level:

• 30%
• 19%
• 9%
• 45%
Crack NEET with Online Course - Free Trial (Offer Valid Till September 17, 2019)
NEET - 2008

At ${10}^{°}C$ the value of the density of a fixed mass of an ideal gas divided by its pressure is x. At ${110}^{°}C$ this ratio is

(a) x

(b)$\frac{383}{283}x$

(c)$\frac{10}{110}x$

(d) $\frac{283}{383}x$

Concept Videos :-

#1 | Basic Terms of Thermodynamics
#2 | Zeroth Law

Concept Questions :-

Basic terms

Writing ideal gas law

Difficulty Level:

• 8%
• 32%
• 18%
• 44%
Crack NEET with Online Course - Free Trial (Offer Valid Till September 17, 2019)

Which of the following is not thermodynamical function ?

(1) Enthalpy

(2) Work done

(3) Gibb's energy

(4) Internal energy

Concept Videos :-

#1 | Basic Terms of Thermodynamics
#2 | Zeroth Law

Concept Questions :-

Basic terms

(2) Work done is not a thermodynamical function.

Difficulty Level:

• 16%
• 39%
• 42%
• 5%
Crack NEET with Online Course - Free Trial (Offer Valid Till September 17, 2019)

Which of the following is not a thermodynamics co-ordinate ?

(1) P

(2) T

(3) V

(4) R

Concept Videos :-

#1 | Basic Terms of Thermodynamics
#2 | Zeroth Law

Concept Questions :-

Basic terms

(4) R is the universal gas constant.

Difficulty Level:

• 3%
• 6%
• 7%
• 86%
Crack NEET with Online Course - Free Trial (Offer Valid Till September 17, 2019)

Which of the following statements is correct for any thermodynamic system ?

(1) The internal energy changes in all processes

(2) Internal energy and entropy are state functions

(3) The change in entropy can never be zero

(4) The work done in an adiabatic process is always zero

Concept Videos :-

#1 | Basic Terms of Thermodynamics
#2 | Zeroth Law

Concept Questions :-

Basic terms

(2) The internal energy and entropy depend only on the initial and final states of the system and not on the path followed to attain that state.

Difficulty Level:

• 7%
• 64%
• 20%
• 11%
Crack NEET with Online Course - Free Trial (Offer Valid Till September 17, 2019)

A monoatomic gas of n-moles is heated from temperature T1 to T2 under two different conditions (i) at constant volume and (ii) at constant pressure. The change in internal energy of the gas is

(1) More for (i)

(2) More for (ii)

(3) Same in both cases

(4) Independent of number of moles

Concept Videos :-

#1 | Basic Terms of Thermodynamics
#2 | Zeroth Law

Concept Questions :-

Basic terms

(3) Change in internal energy

it doesn’t depend upon type of process. Actually it is a state function

Difficulty Level:

• 15%
• 30%
• 51%
• 7%
Crack NEET with Online Course - Free Trial (Offer Valid Till September 17, 2019)

In an isothermal change, an ideal gas obeys -

(1) Boyle's law

(2) Charle's law

(3) Gaylussac law

(4) None of the above

Concept Videos :-

#1 | Basic Terms of Thermodynamics
#2 | Zeroth Law

Concept Questions :-

Basic terms

(1) In isothermal process, compressibility Eθ = ρ.

Difficulty Level:

• 74%
• 13%
• 10%
• 5%
Crack NEET with Online Course - Free Trial (Offer Valid Till September 17, 2019)

A gas mixture consists of 2 moles of oxygen and 4 moles argon at temperature T. Neglecting all vibrational modes, the total internal energy of the system is

(1) 4 RT

(2) 15 RT

(3) 9 RT

(4) 11 RT

Concept Videos :-

#1 | Basic Terms of Thermodynamics
#2 | Zeroth Law

Concept Questions :-

Basic terms

(4) Oxygen is diatomic gas, hence its energy of two moles $=2×\frac{5}{2}RT=5RT$

Argon is a monoatomic gas, hence its internal energy of 4 moles $=4×\frac{3}{2}RT=6RT$

Total Internal energy = (6 + 5)RT = 11RT

Difficulty Level:

• 4%
• 9%
• 19%
• 70%
Crack NEET with Online Course - Free Trial (Offer Valid Till September 17, 2019)

Which one of the following gases possesses the largest internal energy ?

(1) 2 moles of helium occupying 1m3 at 300 K

(2) 56 kg of nitrogen at  Nm–2 and 300 K

(3) 8 grams of oxygen at 8 atm and 300 K

(4) 6 × 1026 molecules of argon occupying 40 m3 at 900 K

Concept Videos :-

#1 | Basic Terms of Thermodynamics
#2 | Zeroth Law

Concept Questions :-

Basic terms

(2) $\Delta U=\mu \text{​}{C}_{V}\Delta T=\frac{m}{M}{C}_{V}\Delta T=\frac{N}{{N}_{A}}{C}_{V}\Delta T$

${\left(\Delta U\right)}_{N}=\frac{56×{10}^{3}}{28}×\frac{5}{2}R×300$

and ${\left(\Delta U\right)}_{Ar}=\frac{6×{10}^{26}}{6×{10}^{23}}×\frac{3}{2}R×900⇒{\left(\Delta U\right)}_{Ar}>{\left(\Delta U\right)}_{N}$

Difficulty Level:

• 11%
• 54%
• 13%
• 24%
Crack NEET with Online Course - Free Trial (Offer Valid Till September 17, 2019)

A system goes from A to B via two processes I and II as shown in figure. If ΔUI and ΔUII are the changes in internal energies in the processes I and II respectively, then

(1) ΔUII > ΔUI

(2) ΔUII < ΔUI

(3) ΔUI = ΔUII

(4) Relation between ΔUI and ΔUII can not be determined

Concept Videos :-

#1 | Basic Terms of Thermodynamics
#2 | Zeroth Law

Concept Questions :-

Basic terms

(3) As internal energy is a state function therefore change in internal energy does not depends upon the path followed i.e. $\Delta {U}_{\text{I}}=\Delta {U}_{\text{II}}$

Difficulty Level:

• 9%
• 15%
• 68%
• 9%
Crack NEET with Online Course - Free Trial (Offer Valid Till September 17, 2019)