# JEE Main Session 2 24th June 2022 Shift 2 Question Paper and Answer Key

JEE MAIN Session 2 24th June 2022 Shift 2

PHYSICS

SECTION-A

IMPORTANT INSTRUCTIONS:

(1) The test is of 3 hours duration:

(2) The Test Booklet consists of 90 questions. The maximum marks are 300.

(3) There are three parts in the question paper consisting of Physics, Chemistry and Mathematics having 30 questions in each part of equal weightage. Each part (subject) has two sections.

(i) Section-A: This section contains 20 multiple choice questions which have only one correct answer. Each question carries 4 marks for correct answer and -1 mark for wrong answer.

(ii) Section-B: This section contains 10 questions. In Section-B, attempt any five questions out of 10. The answer to each of the questions is a numerical value. Each question carries 4 marks for correct answer and -1 mark for wrong answer. For Section-B, the answer should be rounded off to the nearest integer.

1. Identify the pair of physical quantities that have same dimensions:

(A)  velocity gradient and decay constant

(B)  wien’s constant and Stefan constant

(C)  angular frequency and angular momentum

(D)  wave number and Avogadro number

2. The distance between Sun and Earth is R. The duration of year if the distance between Sun and Earth becomes 3R will be:

(A)  √3 years

(B)  3years

(C)  9years

(D)  3√3years

3. A stone of mass m, tied to a string is being whirled in a vertical circle with a uniform speed. The tension in the string is:

(A)  the same throughout the motion

(B)  minimum at the highest position of the circular path

(C)  minimum at the lowest position of the circular path

(D)  minimum when the rope is in the horizontal position

4. Two identical charged particles each having a mass 10 g and charge 2.0 × 107 C area placed on horizontal table with a separation of L between then such that they stay in limited equilibrium. If the coefficient of friction between each particle and the table is 0.25, find the value of L. [Use g = 10 ms2]

(A)  12 cm

(B)  10 cm

(C)  8 cm

(D)  5 cm

5. A Carnot engine take 5000 kcal of heat from a reservoir at 727°C and gives heat to a sink at 127°C. The work done by engine is:

(A)  3 × 106 J

(B)  Zero

(C)  12.6 × 106 J

(D)  8.4 × 106 J

6. Two massless springs with spring constants 2 k and 2 k, carry 50 g and 100 g masses at their free ends. These two masses oscillate vertically such that their maximum velocities are equal. Then, the ratio of their respective amplitudes will be:

(A)  1 : 2

(B)  3 : 2

(C)  3 : 1

(D)  2 : 3

7. What will be the most suitable combination of three resistors A = 2Ω, B = 4Ω, C = 6Ω so that (22/3)Ω is equivalent resistance of combination?

(A)  Parallel combination of A and C connected in series with B.

(B)  Parallel combination of A and B connected in series with C.

(C)  Series combination of A and C connected in parallel with B.

(D)  Series combination of B and C connected in parallel with A.

8. The soft-iron is a suitable material for making an electromagnet. This is because soft-iron has:

(A)  low coercively and high retentively

(B)  low coercively and low permeability

(C)  high permeability and low retentively

(D)  high permeability and high retentively

9. A proton, a deuteron and anα-particle with same kinetic energy enter into a uniform magnetic field at right angle to magnetic field. The ratio of the radii of their respective circular paths is :

(A)  1 :√2 : √2

(B)  1 : 1 : √2

(C)  √2 : 1 : 1

(D)  1 :√2 : 1

10. Given below are statements:

Statement-I :The reactance of an ac circuit is zero. It is possible that the circuit contains a capacitor and inductor.

Statement-II : In ac circuit, the average poser delivered by the source never becomes zero.

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 in false.

(D)  Statement I is false but Statement II is true.

11. Potential energy as a function of r is given by , where r is the interatomic distance, A and B are positive constants. The equilibrium distance between the two atoms will be:

(A)  (A/B)1/5

(B)  (B/A)1/5

(C)  (2A/B)1/5

(D)  (B/2A)1/5

12. An object of mass 5 kg is thrown vertically upwards from the ground. The air resistance produces a constant retarding force of 10 N throughout the motion. The ratio of time of ascent to the time of descent will be equal to : [Use g = 10 ms2]

(A)  1 : 1

(B)  √2 :√3

(C)  √3 :√2

(D)  2 : 3

13. A fly wheel is accelerated uniformly from rest and rotates through 5 rad in the first second. The angle rotated by the fly wheel in the next second, will be:

14. A 100 g of iron nail is hit by a 1.5 kg hammer striking at a velocity of 60 ms1. What will be the rise in the temperature of the nail if one of fourth of energy of the hammer goes into heating the nail?

[Specific heat capacity of iron = 0.42 Jg1°C1]

(A)  675°C

(B)  1600°C

(C)  160.7°C

(D)  6.75°C

15. If the charge on a capacitor is increased by 2 C, the energy stored in it increases by 44%. The original charge on the capacitor is (in C):

(A)  10

(B)  20

(C)  30

(D)  40

16. A long cylindrical volume contains a uniformly distributed charge of density ρ. The radius of cylindrical volume is R. A charge particle (q) revolves around the cylinder in a circular path. The kinetic of the particle is :

17. An electric bulb is rated as 200 W. What will be the peak magnetic field at 4 m distance produced by the radiations coming from this bulb? Consider this bulb as a point source with 3.5% efficiency.

(A)  1.19 × 108 T

(B)  1.71 × 108 T

(C)  0.84 × 108 T

(D)  3.36 × 108 T

18. The light of two different frequencies whose photons have energies 3.8 eV and 1.4 eV respectively, illuminate a metallic surface whose work function is 0.6 eV successively. The ratio of maximum speeds of emitted electrons for the two frequencies respectively will be:

(A)  1 : 1

(B)  2 : 1

(C)  4 : 1

(D)  1 : 4

19. Two light beams of intensities in the ratio of 9 : 4 are allowed to interfere. The ratio of the intensity of maxima and minima will be:

(A)  2 : 3

(B)  16 : 81

(C)  25 : 169

(D)  25 : 1

20. In Bohr’s atomic model of hydrogen, let K. P and E are the kinetic energy, potential energy and total energy of the electron respectively. Choose the correct option when the electron undergoes transitions to a higher level:

(A)  All K.P and E increase.

(B)  K decreases. P and E increase.

(C)  P decreases. K and E increase.

(D)  K increases. P and E decrease.

SECTION-B

21. A body is projected from the ground at an angle of 45° with the horizontal. Its velocity after 2s is 20 ms1. The maximum height reached by the body during its motion is ________ m. (use g = 10 ms2)

22. An antenna is placed in a dielectric medium of dielectric constant 6.25. If the maximum size of that antenna is 5.0 mm. It can radiate a signal of minimum frequency of ________ GHz.

(Given μr = 1 for dielectric medium)

23. A potentiometer wire of length 10 m and resistance 20 Ω is connected in series with a 25 V battery and an external resistance 30 Ω. A cell of emf E in secondary circuit is balanced by 25 cm long potentiometer wire. The value of E ( in volt) is x/10. The value of x is _______.

24. Two travelling waves of equal amplitudes and equal frequencies move in opposite directions along a string. They interfere to produce a stationary wave whose equation is given by

The amplitude of the particle at x = 4/3 cm will be _______ cm.

25. In the given circuit the value of current IL will be _______ mA.

(When RL = 1kΩ)

26. A sample contains 102 kg each of two substances A and B with half lives 4 s and 8 s respectively. The ratio of then atomic weights is 1 : 2. The ratio of the amounts of A and B after 16 s is x/100. The value of x is ________.

27. A ray of light is incident at an angle of incidence 60° on the glass slab of refractive index √ After reaction, the light ray emerges out from other parallel faces and lateral shift between incident ray and emergent ray is 4√3 cm. The thickness of the glass slab is ________ cm.

28. A circular coil of 1000 turns each with area 1 m2 is rotated about its vertical diameter at the rate of one revolution per second in a uniform horizontal magnetic field of 0.07T. The maximum voltage generation will be _______ V.

29. A monoatomic gas performs a work of Q/4 where Q is the heat supplied to it. The molar heat capacity of the gas will be ________ R during this transformation.

Where R is the gas constant.

30. In an experiment to verify Newton’s law of cooling, a graph is plotted between, the temperature difference (∆T) of the water and surroundings and time as shown in figure. The initial temperature of water is taken as 80° The value of t2 as mentioned in the graph will be __________.

CHEMISTRY

SECTION-A

1. 120 of an organic compound that contains only carbon and hydrogen gives 330g of CO2 and 270g of water on complete combustion. The percentage of carbon and hydrogen, respectively are.

(A)  25 and 75

(B)  40 and 60

(C)  60 and 40

(D)  75 and 25

2. The energy of one mole of photons of radiation of wavelength 300 nm is

(Given : h = 6.63 × 1034Js, NA = 6.02 × 1023 mol1, c = 3 × 108 ms1)

(A)  235 kJ mol1

(B)  325kJ mol1

(C)  399kJ mol1

(D)  435kJ mol1

3. The correct order of bound orders of C22−, N22− and O22− is, respectively.

(A)  C22−< N22−< O22−

(B)  O22−< N22−< C22−

(C)  C22−< O22−< N22−

(D)  N22−< C22−< O22−

4. At 25°C and 1 atm pressure, the enthalpies of combustion are as given below:

The enthalpy of formation of ethane is

(A)  +54.0 kJ mol−1

(B)  −68.0 kJ mol−1

(C)  −86.0 kJ mol−1

(D)  +97.0 kJ mol−1

5. For a first order reaction, the time required for completion of 90% reaction is ‘x’ times the half life of the reaction. The value of ‘x’ is

(Given: ln 10 = 2.303 and log 2 = 0.3010)

(A)  1.12

(B)  2.43

(C)  3.32

(D)  33.31

6. Metals generally melt at very high temperature. Amongst the following, the metal with the highest melting point will be

(A)  Hg

(B)  Ag

(C)  Ga

(D)  Cs

7. Which of the following chemical reactions represents Hall-Heroult Process?

(A)  Cr2O3 + 2Al → Al2O3 + 2Cr

(B)  2Al2O3 + 3C → 4Al + 3CO2

(C)  FeO + CO → Fe + CO2

(D)

8. In the industrial production of which of the following, molecular hydrogen is obtained as a byproduct?

(A)  NaOH

(B)  NaCl

(C)  Na Metal

(D)  Na2CO3

9. Which one of the following compounds is used as a chemical in certain type of fire extinguishers?

(A)  Baking Soda

(B)  Soda ash

(C)  Washing Soda

(D)  Caustic Soda

10. PCl5 is well known. but NCl5 is not. Because.

(A)  nitrogen is less reactive than phosphorous.

(B)  nitrogen doesn’t have d-orbitals in its valence         shell.

(C)  catenation tendency is weaker in nitrogen than      phosphorous.

(D)  size of phosphorous is larger than nitrogen.

11. Transition metal complex with highest value of crystal field splitting (∆0) will be

(A)  [Cr(H2O)6]3+

(B)  [Mo(H2O)6]3+

(C)  [Fe(H2O)6]3+

(D)  [Os(H2O)6]3+

12. Some gases are responsible for heating of atmosphere (green house effect). Identify from the following the gaseous species which does not cause it.

(A)  CH4

(B)  O3

(C)  H2O

(D)  N2

13. Arrange the following carbocations in decreasing order of stability.

(A)  A > C > B

(B)  A > B > C

(C)  C > B > A

(D)  C > A > B

14. Given below are two statements.

Statement I: The presence of weaker π- bonds make alkenes less stable than alkanes.

Statement II: The strength of the double bond is greater than that of carbon-carbon single bond.

In the light of the above statements, choose the correct answer from the options given below.

(A)  Both Statement I and Statement II are correct.

(B)  Both Statement I and Statement II are incorrect.

(C)  Statement I is correct but Statement II is incorrect.

(D)  Statement I is incorrect but Statement II is correct.

15. Which of the following reagents/ reactions will convert ‘A’ to ‘B’?

(A)  PCC oxidation

(B)  Ozonolysis

(C)  BH3,H2O2/OH followed by PCC oxidation

(D)  HBr, hydrolysis followed by oxidation by K2Cr2O7.

16. Hex-4-ene-2-ol on treatment with PCC gives ‘A’. ‘A’ on reaction with sodium hypoiodite gives ‘B’, which on further heating with soda lime gives ‘C’. The compound ‘C’ is

(A)  2- pentene

(B)  proponaldehyde

(C)  2-butene

(D)  4-methylpent-2-ene

17. The conversion of propan-1-ol to n-butylamine involves the sequential addition of reagents. The correct sequential order of reagents is.

(A)  (i) SOCl2 (ii) KCN (iii) H2/Ni,Na(Hg)/C2H5OH

(B)  (i) HCl (ii) H2/Ni, Na(Hg)/C2H5OH

(C)  (i) SOCl2 (ii) KCN (iii) CH3NH2

(D)  (i) HCl (ii) CH3NH2

18. Which of the following is not an example of a condensation polymer?

(A)  Nylon 6,6

(B)  Decron

(C)  Buna-N

(D)  Silicone

19. The structure shown below is of which well-known drug molecule?

(A)  Ranitidine

(B)  Seldane

(C)  Cimetidine

(D)  Codeine

20. In the flame test of a mixture of salts, a green flame with blue centre was observed. Which one of the following cations may be present?

(A)  Cu2+

(B)  Sr2+

(C)  Ba2+

(D)  Ca2+

SECTION-B

21. At 300 K, a sample of 3.0 g of gas A occupies the same volume as 0.2 g of hydrogen at 200 K at the same pressure. The molar mass of gas A is____ g mol–1 (nearest integer) Assume that the behaviour of gases as ideal. (Given: The molar mass of hydrogen (H2) gas is 2.0 g mol–1)

22. A company dissolves ‘X’ amount of CO2 at 298 K in 1 litre of water to prepare soda water X = ______ × 103 (nearest integer)

(Given: partial pressure of CO2 at 298 K= 0.835 bar.  Henry’s law constant for CO2 at 298 K = 1.67 kbar.   Atomic mass of H,C and O is 1, 12 and 6 g mol–1, respectively)

23. PCl5 dissociates as

PCl5(g) ⇌ PCl3(g) + Cl2(g)

5 moles of PCl5 are placed in a 200 litre vessel which contains 2 moles of N2 and is maintained at 600 K. The equilibrium pressure is 2.46 atm. The equilibrium constant Kp for the dissociation of PCl5 is_____ × 10–3. (nearest integer)   (Given: R = 0.082 L atm K–1mol–1 : Assume ideal gas behaviour)

24. The resistance of conductivity cell containing 01 M KCl solution at 298 K is 1750 Ω. If the conductively of 0.01 M KCl solution at 298 K is 0.152 × 10–3 S cm–1, then the cell constant of the conductivity cell is_______× 10–3 cm–1.

25. When 200 mL of 0.2 M acetic acid is shaken with 0.6 g of wood charcoal, the final concentration of acetic acid after adsorption is 0.1 M. The mass of acetic acid adsorbed per gram of carbon is ________g.

26. (a) Baryte, (b) Galena, (c) Zinc blende and (d) Copper pyrites. How many of these minerals are sulphide based?

27. Manganese (VI) has ability to disproportionate in acidic solution. The difference in oxidation states of two ions it forms in acidic solution is __________.

28. 0.2 g of an organic compound was subjected to estimation of nitrogen by Duma’s method in which volume of N2 evolved (at STP) was found to be 22.400 mL. The percentage of nitrogen in the compound is _____. [nearest integer]

(Given : Molar mass of N2 is 28 g mol–1, Molar volume of N2 at STP : 22.4L)

29.

Consider the above reaction. The number of π electrons present in the product ‘P’ is ______

30. In alanylglycylleucylalanyvaline, the number of peptide linkages is __________.

MATHEMATICS

SECTION-A

1. Let x * y = x2 + y3 and (x * 1) * 1 = x * (1 * 1). Then a value of  is

(A)  π/4

(B)  π/3

(C)  π/2

(D)  π/6

2. The sum of all the real roots of the equation (e2x – 4) (6e2x – 5ex + 1) = 0 is

(A)  loge3

(B)  −loge3

(C)  loge6

(D)  −loge6

3. Let the system of linear equations

x + y + az = 2

3x + y + z = 4

x + 2z = 1

have a unique solution (x*, y*, z*). If (α, x*), (y*, α) and (x*, –y*) are collinear points, then the sum of absolute values of all possible values of α is

(A)  4

(B)  3

(C)  2

(D)  1

4. Let x, y > 0. If x3y2 = 215, then the least value of 3x + 2y is

(A)  30

(B)  32

(C)  36

(D)  40

5. Let

Where [t] denotes greatest integer t. If m is the number of points where f is not continuous and n is the number of points where f is not differentiable, then the ordered pair (m, n) is

(A)  (3, 3)

(B)  (2, 4)

(C)  (2, 3)

(D)  (3, 4)

6. The value of the integral  is equal to

(A)  2π

(B)  0

(C)  π

(D)  π/2

7. is equal to

8. A particle is moving in the xy-plane along a curve C passing through the point (3, 3). The tangent to the curve C at the point P meets the x-axis at Q. If the y-axis bisects the segment PQ, then C is a parabola with

(A)  Length of latus rectum 3

(B)  Length of latus rectum 6

(C)  Focus (4/3, 0)

(D)  Focus (0, 3/4)

9. Let the maximum area of the triangle that can be inscribed in the ellipse  having one of its vertices at one end of the major axis of the ellipse and one of its sides parallel to the y-axis, be 6√3. Then the eccentricity of the ellipse is

(A)  √3/2

(B)  1/2

(C)  1/√2

(D)  √3/4

10. Let the area of the triangle with vertices A(1, α), B(α, 0) and C(0, α) be 4 sq. units. If the points (α, –α), (–α, α) and (α2, β) are collinear, then β is equal to

(A)  64

(B)  −8

(C)  −64

(D)  512

11. The number of distinct real roots of the equation x7 – 7x – 2 = 0 is

(A)  5

(B)  7

(C)  1

(D)  3

12. A random variable X has the following probability distribution :

The value of P(1 < X < 4 | x ≤ 2) is equal to

(A)  4/7

(B)  2/3

(C)  3/7

(D)  4/5

13. The number of solutions of the equation  x ∈ [−3π, 3π] is :

(A)  8

(B)  5

(C)  6

(D)  7

14. If the shortest distance between the lines  and  is 1/√3, then the sum of all possible values of λ is :

(A)  16

(B)  6

(C)  12

(D)  15

15. Let the points on the plane P be equidistant from the points (–4, 2, 1) and (2, –2, 3). Then the acute angle between the plane P and the plane 2x + y + 3z = 1 is

(A)  π/6

(B)  π/4

(C)  π/3

(D)  5π/12

16. Let  be two unit vectors such that  If θ∈ (0, π) is the angle between  then among the statements:

(S2): The projection of

(A) Only (S1) is true

(B) Only (S2) is true

(C) Both (S1) and (S2) are true

(D) Both (S1) and (S2) are false

17. If y = tan1(secx3 – tan x3).  then

(A)  xy′′ + 2y′ = 0

(B)

(C)  x2y″ – 6y + 3π = 0

(D)  xy″ – 4y′ = 0

18. Consider the following statements:

A : Rishi is a judge.

B : Rishi is honest.

C : Rishi is not arrogant.

The negation of the statement “if Rishi is a judge and he is not arrogant, then he is honest” is

(A) B → (A ∨ C)

(B) (~ B) ∧ (A ∧ C)

(C) B → ((~ A) ∨ (~ C))

(D) B → (A ∧ C)

19. The slope of normal at any point (x, y), x > 0, y > 0 on the curve y = y(x) is given by  If the curve passes through the point (1, 1), then e·y(e) is equal to

(A)

(B)  tan(1)

(C)  1

(D)

20. Let λ* be the largest value of λ for which the function fλ(x) = 4λx3 – 36λx2 + 36x + 48 is increasing for all x ∈ ℝ. Then fλ* (1) + fλ* (– 1) is equal to :

(A)  36

(B)  48

(C)  64

(D)  72

SECTION-B

21. Let S = {z ∈ℂ : |z – 3| ≤ 1 and  If α + iβ is the point in S which is closest to 4i, then 25(α + β) is equal to ______.

22. Let  and let Tn = {A ∈S : An(n+1) = I}. Then the number of elements in  is _______.

23. The number of 7-digit numbers which are multiples of 11 and are formed using all the digits 1, 2, 3, 4, 5, 7 and 9 is _____________.

24. The sum of all the elements of the set {α ∈ {1, 2, …, 100} : HCF(α, 24) = 1} is ____.

25. The remainder on dividing 1 + 3 + 32 + 33 + … + 32021 by 50 ___________ is

26. The area (in sq. units) of the region enclosed between the parabola y2 = 2x and the line x + y = 4 is ___________.

27. Let a circle C : (x – h)2 + (y – k)2 = r2, k > 0, touch the x-axis at (1, 0). If the line x + y = 0 intersects the circle C at P and Q such that the length of the chord PQ is 2, then the value of h + k + r is equal to _________.

28. In an examination, there are 10 true-false type questions. Out of 10, a student can guess the answer of 4 questions correctly with probability 3/4and the remaining 6 questions correctly with probability 1/4. If the probability that the student guesses the answers of exactly 8 questions correctly out of 10 is 27k/410, then k is equal to _________.

29. Let the hyperbola  and the ellipse E : 3x2 + 4y2 = 12 be such that the length of latus rectum of H is equal to the length of latus rectum of E. If eH and eE are the eccentricities of H and E respectively, then the value of 12(eH2 + eE2) is equal to ___________.