JEE Advanced 2022 Paper-2

Solution

α

and

β

be real numbers such that

- \frac{π}{4} < β < 0 < α < \frac{π}{4}

.

If

\sin (α + β) = \frac{1}{3}

and

\cos (α - β) = \frac{2}{3}

, then the greatest integer less than or equal to

is ____________.

Let

α

and

β

be real numbers such that

- \frac{π}{4} < β < 0 < α < \frac{π}{4}

.

If

\sin (α + β) = \frac{1}{3}

and

\cos (α - β) = \frac{2}{3}

, then the greatest integer less than or equal to

If 𝑦(𝑥) is the solution of the differential equation

𝑥𝑑𝑦 − (𝑦² − 4𝑦)𝑑𝑥 = 0 for 𝑥 > 0, 𝑦(1) = 2,

and the slope of the curve 𝑦 = 𝑦(𝑥) is never zero, then the value of 10 𝑦(√2 ) is _____________.

If 𝑦(𝑥) is the solution of the differential equation

𝑥𝑑𝑦 − (𝑦² − 4𝑦)𝑑𝑥 = 0 for 𝑥 > 0, 𝑦(1) = 2,

and the slope of the curve 𝑦 = 𝑦(𝑥) is never zero, then the value of 10 𝑦(√2 ) is _____________.

Q.3 Correct

Q.3 In-correct

Q.3 Unattempt

The greatest integer less than or equal to

\int_{1}^{2} \log_{2} (x^{3} + 1) d x + \int_{1}^{\log_{2} 9} {(2^{x} - 1)}^{\frac{1}{3}} d x

is ___________.

The greatest integer less than or equal to

\int_{1}^{2} \log_{2} (x^{3} + 1) d x + \int_{1}^{\log_{2} 9} {(2^{x} - 1)}^{\frac{1}{3}} d x

The product of all positive real values of

x

satisfying the equation

x^{(16 {(\log_{5} x)}^{3} - 68 \log_{5} x)} = 5^{- 16}

is __________.

The product of all positive real values of

x

satisfying the equation

x^{(16 {(\log_{5} x)}^{3} - 68 \log_{5} x)} = 5^{- 16}

β = lim_{x \to 0} \frac{e^{x^{3}} - {(1 - x^{3})}^{\frac{1}{3}} + ({(1 - x^{2})}^{\frac{1}{2}} - 1) \sin x}{x \sin^{2} x},

then the value of

6 β

is ___________.

β = lim_{x \to 0} \frac{e^{x^{3}} - {(1 - x^{3})}^{\frac{1}{3}} + ({(1 - x^{2})}^{\frac{1}{2}} - 1) \sin x}{x \sin^{2} x},

then the value of

6 β

β

be a real number. Consider the matrix

A = (\begin{array}{ccc} β & 0 & 1 \\ 2 & 1 & - 2 \\ 3 & 1 & - 2 \end{array})

A^{7} - (β - 1) A^{6} - β A^{5}

is a singular matrix, then the value of

9 β

is _________.

Let

β

be a real number. Consider the matrix

A = (\begin{array}{ccc} β & 0 & 1 \\ 2 & 1 & - 2 \\ 3 & 1 & - 2 \end{array})

A^{7} - (β - 1) A^{6} - β A^{5}

is a singular matrix, then the value of

9 β

Consider the hyperbola

\frac{x^{2}}{100} - \frac{y^{2}}{64} = 1

with foci at

S

and

S_{1}

, where

S

lies on the positive

x

-axis. Let

P

be a point on the hyperbola, in the first quadrant. Let

∠ S P S_{1} = α

, with

α < \frac{π}{2}

. The straight line passing through the point

S

and having the same slope as that of the tangent at

P

to the hyperbola, intersects the straight line

S_{1} P

P_{1}

. Let

δ

be the distance of

P

from the straight line

S P_{1}

, and

β = S_{1} P

. Then the greatest integer less than or equal to

\frac{β δ}{9} \sin \frac{α}{2}

is ________.

Consider the hyperbola

\frac{x^{2}}{100} - \frac{y^{2}}{64} = 1

with foci at

S

and

S_{1}

, where

S

lies on the positive

x

-axis. Let

P

be a point on the hyperbola, in the first quadrant. Let

∠ S P S_{1} = α

, with

α < \frac{π}{2}

. The straight line passing through the point

S

and having the same slope as that of the tangent at

P

to the hyperbola, intersects the straight line

S_{1} P

P_{1}

. Let

δ

be the distance of

P

from the straight line

S P_{1}

, and

β = S_{1} P

. Then the greatest integer less than or equal to

\frac{β δ}{9} \sin \frac{α}{2}

Consider the functions 𝑓, 𝑔 ∶ ℝ → ℝ defined by

If 𝛼 is the area of the region

then the value of 9𝛼 is _____________.

Consider the functions 𝑓, 𝑔 ∶ ℝ → ℝ defined by

If 𝛼 is the area of the region

then the value of 9𝛼 is _____________.

P Q R S

be a quadrilateral in a plane, where

Q R = 1, ∠ P Q R = ∠ Q R S = 70^{\circ}, ∠ P Q S = 15^{\circ}

and

∠ P R S = 40^{\circ}

.

If

∠ R P S = θ^{\circ}, P Q = α

and

P S = β

, then the interval(s) that contain(s) the value of

4 α β \sin θ^{\circ}

is/are

Let

P Q R S

be a quadrilateral in a plane, where

Q R = 1, ∠ P Q R = ∠ Q R S = 70^{\circ}, ∠ P Q S = 15^{\circ}

and

∠ P R S = 40^{\circ}

.

If

∠ R P S = θ^{\circ}, P Q = α

and

P S = β

, then the interval(s) that contain(s) the value of

4 α β \sin θ^{\circ}

Let

α = \sum_{k = 1}^{\infty} \sin^{2 k} (\frac{π}{6})

Let

g : [0, 1] \to R

be the function defined by

g (x) = 2^{α x} + 2^{α (1 - x)} .

Then, which of the following statements is/are TRUE ?

Let

α = \sum_{k = 1}^{\infty} \sin^{2 k} (\frac{π}{6})

Let

g : [0, 1] \to R

be the function defined by

g (x) = 2^{α x} + 2^{α (1 - x)} .

Then, which of the following statements is/are TRUE ?

\bar{z}

denote the complex conjugate of a complex number

z

. If

z

is a non-zero complex number for which both real and imaginary parts of

(\bar{z})^{2} + \frac{1}{z^{2}}

are integers, then which of the following is/are possible value(s) of

| z |

Let

\bar{z}

denote the complex conjugate of a complex number

z

. If

z

is a non-zero complex number for which both real and imaginary parts of

(\bar{z})^{2} + \frac{1}{z^{2}}

are integers, then which of the following is/are possible value(s) of

| z |

G

be a circle of radius

R > 0

. Let

G_{1}, G_{2}, \dots, G_{n}

n

circles of equal radius

r > 0

. Suppose each of the

n

circles

G_{1}, G_{2}, \dots, G_{n}

touches the circle

G

externally. Also, for

i = 1, 2, \dots, n - 1

, the circle

G_{i}

touches

G_{i + 1}

externally, and

G_{n}

touches

G_{1}

externally. Then, which of the following statements is/are TRUE?

Let

G

be a circle of radius

R > 0

. Let

G_{1}, G_{2}, \dots, G_{n}

n

circles of equal radius

r > 0

. Suppose each of the

n

circles

G_{1}, G_{2}, \dots, G_{n}

touches the circle

G

externally. Also, for

i = 1, 2, \dots, n - 1

, the circle

G_{i}

touches

G_{i + 1}

externally, and

G_{n}

touches

G_{1}

externally. Then, which of the following statements is/are TRUE?

\hat{ı}, \hat{ȷ}

and

\hat{k}

be the unit vectors along the three positive coordinate axes. Let

\begin{aligned} \vec{a} = 3 \hat{ı} + \hat{ȷ} - \hat{k}, \\ \vec{b} = \hat{ı} + b_{2} \hat{ȷ} + b_{3} \hat{k}, b_{2}, b_{3} \in R, \\ \vec{c} = c_{1} \hat{ı} + c_{2} \hat{ȷ} + c_{3} \hat{k}, c_{1}, c_{2}, c_{3} \in R \end{aligned}

be three vectors such that

b_{2} b_{3} > 0, \vec{a} \cdot \vec{b} = 0

and

(\begin{array}{ccc} 0 & - c_{3} & c_{2} \\ c_{3} & 0 & - c_{1} \\ - c_{2} & c_{1} & 0 \end{array}) (\begin{array}{l} 1 \\ b_{2} \\ b_{3} \end{array}) = (\begin{array}{r} 3 - c_{1} \\ 1 - c_{2} \\ - 1 - c_{3} \end{array}) .

Then, which of the following is/are TRUE?

Let

\hat{ı}, \hat{ȷ}

and

\hat{k}

be the unit vectors along the three positive coordinate axes. Let

\begin{aligned} \vec{a} = 3 \hat{ı} + \hat{ȷ} - \hat{k}, \\ \vec{b} = \hat{ı} + b_{2} \hat{ȷ} + b_{3} \hat{k}, b_{2}, b_{3} \in R, \\ \vec{c} = c_{1} \hat{ı} + c_{2} \hat{ȷ} + c_{3} \hat{k}, c_{1}, c_{2}, c_{3} \in R \end{aligned}

be three vectors such that

b_{2} b_{3} > 0, \vec{a} \cdot \vec{b} = 0

and

(\begin{array}{ccc} 0 & - c_{3} & c_{2} \\ c_{3} & 0 & - c_{1} \\ - c_{2} & c_{1} & 0 \end{array}) (\begin{array}{l} 1 \\ b_{2} \\ b_{3} \end{array}) = (\begin{array}{r} 3 - c_{1} \\ 1 - c_{2} \\ - 1 - c_{3} \end{array}) .

Then, which of the following is/are TRUE?

x \in R

, let the function

y (x)

be the solution of the differential equation

\frac{d y}{d x} + 12 y = \cos (\frac{π}{12} x), y (0) = 0

Then, which of the following statements is/are TRUE ?

For

x \in R

, let the function

y (x)

be the solution of the differential equation

\frac{d y}{d x} + 12 y = \cos (\frac{π}{12} x), y (0) = 0

Then, which of the following statements is/are TRUE ?

Q.15 Correct

Q.15 In-correct

Q.15 Unattempt

Consider 4 boxes, where each box contains 3 red balls and 2 blue balls. Assume that all 20 balls are distinct. In how many different ways can 10 balls be chosen from these 4 boxes so that from each box at least one red ball and one blue ball are chosen ?

Q.16 Correct

Q.16 In-correct

Q.16 Unattempt

M = (\begin{array}{rr} \frac{5}{2} & \frac{3}{2} \\ - \frac{3}{2} & - \frac{1}{2} \end{array})

, then which of the

following matrices is equal to

M^{2022} ?

M = (\begin{array}{rr} \frac{5}{2} & \frac{3}{2} \\ - \frac{3}{2} & - \frac{1}{2} \end{array})

, then which of the

following matrices is equal to

M^{2022} ?

Box-I contains 8 red, 3 blue and 5 green balls,

Box-II contains 24 red, 9 blue and 15 green balls,

Box-III contains 1 blue, 12 green and 3 yellow balls,

Box-IV contains 10 green, 16 orange and 6 white balls.

A ball is chosen randomly from Box-I; call this ball $b$ . If $b$ is red then a ball is chosen randomly from Box-II, if $b$ is blue then a ball is chosen randomly from Box-III, and if $b$ is green then a ball is chosen randomly from Box-IV. The conditional probability of the event 'one of the chosen balls is white' given that the event 'at least one of the chosen balls is green' has happened, is equal to

n

, define

f (n) = n + \frac{16 + 5 n - 3 n^{2}}{4 n + 3 n^{2}} + \frac{32 + n - 3 n^{2}}{8 n + 3 n^{2}} + \frac{48 - 3 n - 3 n^{2}}{12 n + 3 n^{2}} + \dots + \frac{25 n - 7 n^{2}}{7 n^{2}} .

Then, the value of

lim_{x \to \infty} f (n)

is equal to

For positive integer

n

, define

f (n) = n + \frac{16 + 5 n - 3 n^{2}}{4 n + 3 n^{2}} + \frac{32 + n - 3 n^{2}}{8 n + 3 n^{2}} + \frac{48 - 3 n - 3 n^{2}}{12 n + 3 n^{2}} + \dots + \frac{25 n - 7 n^{2}}{7 n^{2}} .

Then, the value of

lim_{x \to \infty} f (n)

Concentration of $H_{2} {SO}_{4}$ and ${Na}_{2} {SO}_{4}$ in a solution is $1 M$ and $1.8 \times 10^{- 2} M$ , respectively. Molar solubility of ${PbSO}_{4}$ in the same solution is $X \times 10^{- Y} M$ (expressed in scientific notation). The value of $Y$ is ________.

[Given: Solubility product of ${PbSO}_{4} (K_{s p}) = 1.6 \times 10^{- 8}$ . For $H_{2} {SO}_{4}, K_{a l}$ is very large and $K_{a 2} = 1.2 \times 10^{- 2}]$

Q.2 Correct

Q.2 In-correct

Q.2 Unattempt

An aqueous solution is prepared by dissolving

0.1 mol

of an ionic salt in

1.8 kg

of water at

35^{\circ} C

. The salt remains

90 %

dissociated in the solution. The vapour pressure of the solution is

59.724 mm

of Hg. Vapor pressure of water at

35^{\circ} C

60.000 mm

Hg

. The number of ions present per formula unit of the ionic salt is _________.

An aqueous solution is prepared by dissolving

0.1 mol

of an ionic salt in

1.8 kg

of water at

35^{\circ} C

. The salt remains

90 %

dissociated in the solution. The vapour pressure of the solution is

59.724 mm

of Hg. Vapor pressure of water at

35^{\circ} C

60.000 mm

Hg

. The number of ions present per formula unit of the ionic salt is _________.

Q.3 Correct

Q.3 In-correct

Q.3 Unattempt

Consider the strong electrolytes Z_mX_n,U_mY_p and V_mX_n. Limiting molar conductivity ( Λ⁰ ) of U_mY_p and V_mX_n are 250 and 440 S cm² mol⁻¹, respectively. The value of (m + n + p) is

Given:

λ⁰ is the limiting molar conductivity of ions

The plot of molar conductivity ( Λ ) of Z_mX_nus c^1/2 is given below.

Consider the strong electrolytes Z_mX_n,U_mY_p and V_mX_n. Limiting molar conductivity ( Λ⁰ ) of U_mY_p and V_mX_n are 250 and 440 S cm² mol⁻¹, respectively. The value of (m + n + p) is

Given:

λ⁰ is the limiting molar conductivity of ions

The plot of molar conductivity ( Λ ) of Z_mX_nus c^1/2 is given below.

Xe

and

O_{2} F_{2}

gives a

Xe

compound

P

. The number of moles of

HF

produced by the complete hydrolysis of

1 mol

P

is __________.

The reaction of

Xe

and

O_{2} F_{2}

gives a

Xe

compound

P

. The number of moles of

HF

produced by the complete hydrolysis of

1 mol

P

Thermal decomposition of

{AgNO}_{3}

produces two paramagnetic gases. The total number of electrons present in the antibonding molecular orbitals of the gas that has the higher number of unpaired electrons is Q.6 The number of isomeric tetraenes (NOT containing

s p

-hybridized carbon atoms) that can be formed from the following reaction sequence is ___________.

Thermal decomposition of

{AgNO}_{3}

s p

-hybridized carbon atoms) that can be formed from the following reaction sequence is ___________.

Q.6 Correct

Q.6 In-correct

Q.6 Unattempt

The number of isomeric tetraenes (NOT containing

s p

-hybridized carbon atoms) that can be formed from the following reaction sequence is ___________.

The number of isomeric tetraenes (NOT containing

s p

-hybridized carbon atoms) that can be formed from the following reaction sequence is ___________.

- {CH}_{2} -

(methylene) groups in the product formed from the following reaction sequence is _________.

The number of

- {CH}_{2} -

(methylene) groups in the product formed from the following reaction sequence is _________.

Q.8 Correct

Q.8 In-correct

Q.8 Unattempt

The total number of chiral molecules formed from one molecule of

P

on complete ozonolysis

(O_{3}, Zn / H_{2} O)

is _________.

The total number of chiral molecules formed from one molecule of

P

on complete ozonolysis

(O_{3}, Zn / H_{2} O)

To check the principle of multiple proportions, a series of pure binary compounds

(P_{m} Q_{n})

were analyzed and their composition is tabulated below. The correct option(s) is(are)

Compound	Weight % of $P$	Weight % of $Q$
1	50	50
2	44.4	55.6
3	40	60

To check the principle of multiple proportions, a series of pure binary compounds

(P_{m} Q_{n})

were analyzed and their composition is tabulated below. The correct option(s) is(are)

Compound	Weight % of $P$	Weight % of $Q$
1	50	50
2	44.4	55.6
3	40	60

Q.10 Correct

Q.10 In-correct

Q.10 Unattempt

The correct option(s) about entropy (S) is(are)

[R =

gas constant,

F =

Faraday constant,

T =

Temperature

]

The correct option(s) about entropy (S) is(are)

[R =

gas constant,

F =

Faraday constant,

T =

Temperature

]

Q.11 Correct

Q.11 In-correct

Q.11 Unattempt

The compound(s) which react(s) with

{NH}_{3}

to give boron nitride (BN) is(are)

The compound(s) which react(s) with

{NH}_{3}

to give boron nitride (BN) is(are)

Q.12 Correct

Q.12 In-correct

Q.12 Unattempt

The correct option(s) related to the extraction of iron from its ore in the blast furnace operating in the temperature range

900 - 1500 K

is(are)

The correct option(s) related to the extraction of iron from its ore in the blast furnace operating in the temperature range

900 - 1500 K

Considering the following reaction sequence, the correct statement(s) is(are)

Q.14 Correct

Q.14 In-correct

Q.14 Unattempt

Among the following, the correct statement(s) about polymers is(are)

X

occupies the fcc lattice sites as well as alternate tetrahedral voids of the same lattice. The packing efficiency (in %) of the resultant solid is closest to

Atom

X

occupies the fcc lattice sites as well as alternate tetrahedral voids of the same lattice. The packing efficiency (in %) of the resultant solid is closest to

{HClO}_{3}

with

HCl

gives a paramagnetic gas, which upon reaction with

O_{3}

produces

The reaction of

{HClO}_{3}

with

HCl

gives a paramagnetic gas, which upon reaction with

O_{3}

Pb {({NO}_{3})}_{2}

and

NaCl

in water produces a precipitate that dissolves upon the addition of

HCl

of appropriate concentration. The dissolution of the precipitate is due to the formation of

The reaction of

Pb {({NO}_{3})}_{2}

and

NaCl

in water produces a precipitate that dissolves upon the addition of

HCl

of appropriate concentration. The dissolution of the precipitate is due to the formation of

Q.18 Correct

Q.18 In-correct

Q.18 Unattempt

Treatment of D-glucose with aqueous

NaOH

results in a mixture of monosaccharides, which are

Treatment of D-glucose with aqueous

NaOH

results in a mixture of monosaccharides, which are

In a radioactive decay chain reaction,

_{90}^{230} Th

nucleus decays into

_{84}^{214} Po

nucleus. The ratio of the number of

α

to number of

β^{-}

particles emitted in this process is ________.

In a radioactive decay chain reaction,

_{90}^{230} Th

nucleus decays into

_{84}^{214} Po

nucleus. The ratio of the number of

α

to number of

β^{-}

particles emitted in this process is ________.

Q.3 Correct

Q.3 In-correct

Q.3 Unattempt

Two resistances $R_{1} = X Ω$ and $R_{2} = 1 Ω$ are connected to a wire $A B$ of uniform resistivity, as shown in the figure. The radius of the wire varies linearly along its axis from $0.2 mm$ at $A$ to $1 mm$ at $B$ . A galvanometer $(G)$ connected to the center of the wire, $50 cm$ from each end along its axis, shows zero deflection when $A$ and $B$ are connected to a battery. The value of $X$ is ____________.

Q.4 Correct

Q.4 In-correct

Q.4 Unattempt

In a particular system of units, a physical quantity can be expressed in terms of the electric charge $e$ , electron mass $m_{e}$ , Planck's constant $h$ , and Coulomb's constant $k = \frac{1}{4 π ϵ_{0}}$ , where $ϵ_{0}$ is the permittivity of vacuum. In terms of these physical constants, the dimension of the magnetic field is $[B] = [e]^{α} {[m_{e}]}^{β} [h]^{γ} [k]^{δ}$ . The value of $α + β + γ + δ$ is _______.

Q.5 Correct

Q.5 In-correct

Q.5 Unattempt

Consider a configuration of $n$ identical units, each consisting of three layers. The first layer is a column of air of height $h = \frac{1}{3} cm$ , and the second and third layers are of equal thickness $d =$ $\frac{\sqrt{3} - 1}{2} cm$ , and refractive indices $μ_{1} = \sqrt{\frac{3}{2}}$ and $μ_{2} = \sqrt{3}$ , respectively. A light source 0 is placed on the top of the first unit, as shown in the figure. A ray of light from 0 is incident on the second layer of the first unit at an angle of $θ = 60^{\circ}$ to the normal. For a specific value of $n$ , the ray of light emerges from the bottom of the configuration at a distance $l = \frac{8}{\sqrt{3}} cm$ , as shown in the figure. The value of $n$ is ________.

Q.6 Correct

Q.6 In-correct

Q.6 Unattempt

A charge $q$ is surrounded by a closed surface consisting of an inverted cone of height $h$ and base radius $R$ , and a hemisphere of radius $R$ as shown in the figure. The electric flux through the conical surface is $\frac{n q}{6 ϵ_{0}}$ (in SI units). The value of $n$ is _______.

Q.7 Correct

Q.7 In-correct

Q.7 Unattempt

On a frictionless horizontal plane, a bob of mass $m = 0.1 kg$ is attached to a spring with natural length $l_{0} = 0.1 m$ . The spring constant is $k_{1} = 0.009 {Nm}^{- 1}$ when the length of the spring $l > l_{0}$ and is $k_{2} = 0.016 {Nm}^{- 1}$ when $l < l_{0}$ . Initially the bob is released from $l =$ $0.15 m$ . Assume that Hooke's law remains valid throughout the motion. If the time period of the full oscillation is $T = (n π) s$ , then the integer closest to $n$ is __________.

Q.8 Correct

Q.8 In-correct

Q.8 Unattempt

An object and a concave mirror of focal length $f = 10 cm$ both move along the principal axis of the mirror with constant speeds. The object moves with speed $V_{0} = 15 cm s^{- 1}$ towards the mirror with respect to a laboratory frame. The distance between the object and the mirror at a given moment is denoted by $u$ . When $u = 30 cm$ , the speed of the mirror $V_{m}$ is such that the image is instantaneously at rest with respect to the laboratory frame, and the object forms a real image. The magnitude of $V_{m}$ is _________ $cm s^{- 1}$ .

Q.9 Correct

Q.9 In-correct

Q.9 Unattempt

In the figure, the inner (shaded) region $A$ represents a sphere of radius $r_{A} = 1$ , within which the electrostatic charge density varies with the radial distance $r$ from the center as $ρ_{A} = k r$ , where $k$ is positive. In the spherical shell $B$ of outer radius $r_{B}$ , the electrostatic charge density varies as $ρ_{B} =$ $\frac{2 k}{r}$ . Assume that dimensions are taken care of. All physical quantities are in their SI units.

Which of the following statement(s) is(are) correct?

Q.10 Correct

Q.10 In-correct

Q.10 Unattempt

In Circuit-1 and Circuit- 2 shown in the figures,

R_{1} = 1 Ω, R_{2} = 2 Ω

and

R_{3} = 3 Ω

P_{1}

and

P_{2}

are the power dissipations in Circuit-1 and Circuit-2 when the switches

S_{1}

and

S_{2}

are in open conditions, respectively.

Q_{1}

and

Q_{2}

are the power dissipations in Circuit-1 and Circuit-2 when the switches

S_{1}

and

S_{2}

are in closed conditions, respectively.

Which of the following statement(s) is(are) correct?

In Circuit-1 and Circuit- 2 shown in the figures,

R_{1} = 1 Ω, R_{2} = 2 Ω

and

R_{3} = 3 Ω

P_{1}

and

P_{2}

are the power dissipations in Circuit-1 and Circuit-2 when the switches

S_{1}

and

S_{2}

are in open conditions, respectively.

Q_{1}

and

Q_{2}

are the power dissipations in Circuit-1 and Circuit-2 when the switches

S_{1}

and

S_{2}

are in closed conditions, respectively.

Which of the following statement(s) is(are) correct?

Q.11 Correct

Q.11 In-correct

Q.11 Unattempt

A bubble has surface tension

S

. The ideal gas inside the bubble has ratio of specific heats

γ =

\frac{5}{3}

. The bubble is exposed to the atmosphere and it always retains its spherical shape. When the atmospheric pressure is

P_{a 1}

, the radius of the bubble is found to be

r_{1}

and the temperature of the enclosed gas is

T_{1}

. When the atmospheric pressure is

P_{a 2}

, the radius of the bubble and the temperature of the enclosed gas are

r_{2}

and

T_{2}

, respectively.

Which of the following statement(s) is(are) correct?

A bubble has surface tension

S

. The ideal gas inside the bubble has ratio of specific heats

γ =

\frac{5}{3}

. The bubble is exposed to the atmosphere and it always retains its spherical shape. When the atmospheric pressure is

P_{a 1}

, the radius of the bubble is found to be

r_{1}

and the temperature of the enclosed gas is

T_{1}

. When the atmospheric pressure is

P_{a 2}

, the radius of the bubble and the temperature of the enclosed gas are

r_{2}

and

T_{2}

, respectively.

Which of the following statement(s) is(are) correct?

R

with uniform positive charge density

σ

is placed on the

x y

plane with its center at the origin. The Coulomb potential along the

z

-axis is

V (z) = \frac{σ}{2 ϵ_{0}} (\sqrt{R^{2} + z^{2}} - z) .

A particle of positive charge

q

is placed initially at rest at a point on the

z

axis with

z = z_{0}

and

z_{0} > 0

. In addition to the Coulomb force, the particle experiences a vertical force

\vec{F} = - c \hat{k}

with

c > 0

. Let

β = \frac{2 c ϵ_{0}}{q σ}

.

Which of the following statement(s) is(are) correct?

A disk of radius

R

with uniform positive charge density

σ

is placed on the

x y

plane with its center at the origin. The Coulomb potential along the

z

-axis is

V (z) = \frac{σ}{2 ϵ_{0}} (\sqrt{R^{2} + z^{2}} - z) .

A particle of positive charge

q

is placed initially at rest at a point on the

z

axis with

z = z_{0}

and

z_{0} > 0

. In addition to the Coulomb force, the particle experiences a vertical force

\vec{F} = - c \hat{k}

with

c > 0

. Let

β = \frac{2 c ϵ_{0}}{q σ}

.

Which of the following statement(s) is(are) correct?

Q.13 Correct

Q.13 In-correct

Q.13 Unattempt

A double slit setup is shown in the figure. One of the slits is in medium 2 of refractive index $n_{2}$ . The other slit is at the interface of this medium with another medium 1 of refractive index $n_{1} (\neq n_{2})$ . The line joining the slits is perpendicular to the interface and the distance between the slits is $d$ . The slit widths are much smaller than $d$ . A monochromatic parallel beam of light is incident on the slits from medium 1. A detector is placed in medium 2 at a large distance from the slits, and at an angle $θ$ from the line joining them, so that $θ$ equals the angle of refraction of the beam. Consider two approximately parallel rays from the slits received by the detector.

Which of the following statement(s) is(are) correct?

Q.14 Correct

Q.14 In-correct

Q.14 Unattempt

In the given $P - V$ diagram, a monoatomic gas $(γ = \frac{5}{3})$ is first compressed adiabatically from state $A$ to state $B$ . Then it expands isothermally from state $B$ to state $C$ . [Given: ${(\frac{1}{3})}^{0.6} ≃ 0.5, \ln 2 ≃ 0.7$ ].

Which of the following statement(s) is(are) correct?

Q.15 Correct

Q.15 In-correct

Q.15 Unattempt

A flat surface of a thin uniform disk $A$ of radius $R$ is glued to a horizontal table. Another thin uniform disk $B$ of mass $M$ and with the same radius $R$ rolls without slipping on the circumference of $A$ , as shown in the figure. A flat surface of $B$ also lies on the plane of the table. The center of mass of $B$ has fixed angular speed $ω$ about the vertical axis passing through the center of $A$ . The angular momentum of $B$ is $n M ω R^{2}$ with respect to the center of $A$ . Which of the following is the value of $n$ ?

Q.16 Correct

Q.16 In-correct

Q.16 Unattempt

When light of a given wavelength is incident on a metallic surface, the minimum potential needed to stop the emitted photoelectrons is $6.0 V$ . This potential drops to $0.6 V$ if another source with wavelength four times that of the first one and intensity half of the first one is used. What are the wavelength of the first source and the work function of the metal, respectively? [Take $\frac{h c}{e} = 1.24 \times$ $10^{- 6} {JmC}^{- 1}$ .]

Q.17 Correct

Q.17 In-correct

Q.17 Unattempt

Area of the cross-section of a wire is measured using a screw gauge. The pitch of the main scale is $0.5 mm$ . The circular scale has 100 divisions and for one full rotation of the circular scale, the main scale shifts by two divisions. The measured readings are listed below.

Measurement condition	Main scale reading	Circular scale reading
Two arms of gauge touching each other without wire	0 division	4 divisions
Attempt-1: With wire	4 divisions	20 divisions
Attempt-2: With wire	4 divisions	16 divisions

What are the diameter and cross-sectional area of the wire measured using the screw gauge?

Measurement condition	Main scale reading	Circular scale reading
Two arms of gauge touching each other without wire	0 division	4 divisions
Attempt-1: With wire	4 divisions	20 divisions
Attempt-2: With wire	4 divisions	16 divisions

What are the diameter and cross-sectional area of the wire measured using the screw gauge?

Q.18 Correct

Q.18 In-correct

Q.18 Unattempt

Which one of the following options represents the magnetic field $\vec{B}$ at $O$ due to the current flowing in the given wire segments lying on the $x y$ plane?