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Jan 24, 2023

JEE Mains

Shift: 2

Total Questions Available: 73

Question 1

Find out the major products from the following reactions.

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Hydrocarbons Question 24 English

Options:

A)

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Hydrocarbons Question 24 English Option 1

B)

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Hydrocarbons Question 24 English Option 2

C)

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Hydrocarbons Question 24 English Option 3

D)

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Hydrocarbons Question 24 English Option 4

Question 2

Choose the correct colour of the product for the following reaction.

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Compounds Containing Nitrogen Question 31 English

Options:

A)

White

B)

Yellow

C)

Red

D)

Blue

Numerical TypeQuestion 3

One mole of an ideal monoatomic gas is subjected to changes as shown in the graph. The magnitude of the work done (by the system or on the system) is __________ J (nearest integer)

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Thermodynamics Question 25 English

Given ; log2=0.3\log2=0.3

ln10=2.3\ln10=2.3

Numerical TypeQuestion 4

Sum of π\pi-bonds present in peroxodisulphuric acid and pyrosulphuric acid is ___________

Numerical TypeQuestion 5

The number of units, which are used to express concentration of solutions from the following is _________

Mass percent, Mole, Mole fraction, Molarity, ppm, Molality

Question 6

Let f(x)f(x) be a function such that f(x+y)=f(x).f(y)f(x+y)=f(x).f(y) for all x,yNx,y\in \mathbb{N}. If f(1)=3f(1)=3 and k=1nf(k)=3279\sum\limits_{k = 1}^n {f(k) = 3279} , then the value of n is

Options:

A)

9

B)

7

C)

6

D)

8

Question 7

Let y=y(x)y=y(x) be the solution of the differential equation (x23y2)dx+3xy dy=0,y(1)=1(x^2-3y^2)dx+3xy~dy=0,y(1)=1. Then 6y2(e)6y^2(e) is equal to

Options:

A)

32e2\frac{3}{2}\mathrm{e}^2

B)

3e23\mathrm{e}^2

C)

e2\mathrm{e}^2

D)

2e22\mathrm{e}^2

Numerical TypeQuestion 8

Let a=i^+2j^+λk^,b=3i^5j^λk^,a.c=7,2b.c+43=0,a×c=b×c\overrightarrow a = \widehat i + 2\widehat j + \lambda \widehat k,\overrightarrow b = 3\widehat i - 5\widehat j - \lambda \widehat k,\overrightarrow a \,.\,\overrightarrow c = 7,2\overrightarrow b \,.\,\overrightarrow c + 43 = 0,\overrightarrow a \times \overrightarrow c = \overrightarrow b \times \overrightarrow c . Then a.b\left| {\overrightarrow a \,.\,\overrightarrow b } \right| is equal to :

Numerical TypeQuestion 9

Let ff be aa differentiable function defined on [0,π2]\left[ {0,{\pi \over 2}} \right] such that f(x)>0f(x) > 0 and f(x)+0xf(t)1(logef(t))2dt=e,x[0,π2]f(x) + \int_0^x {f(t)\sqrt {1 - {{({{\log }_e}f(t))}^2}} dt = e,\forall x \in \left[ {0,{\pi \over 2}} \right]}. Then (6logef(π6))2\left( {6{{\log }_e}f\left( {{\pi \over 6}} \right)} \right)^2 is equal to __________.

Question 10

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion A : Benzene is more stable than hypothetical cyclohexatriene

Reason R : The delocalised π\pi electron cloud is attracted more strongly by nuclei of carbon atoms.

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

Options:

A)

A is true but R is false

B)

Both A and R are correct and R is the correct explanation of A

C)

Both A and R are correct but R is NOT the correct explanation of A

D)

A is false but R is true

Question 11

Given below are two statements :

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Compounds Containing Nitrogen Question 30 English 1

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Compounds Containing Nitrogen Question 30 English 2

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

Options:

A)

Both Statement I and Statement II are true

B)

Statement I is false but Statement II is true

C)

Statement I is true but Statement II is false

D)

Both Statement I and Statement II are false

Question 12

Given below are two statements:

Statement I : Pure Aniline and other arylamines are usually colourless.

Statement II : Arylamines get coloured on storage due to atmospheric reduction.

In the light of the above statements, choose the most appropriate answer from the options given below :

Options:

A)

Both Statement I and Statement II are correct

B)

Statement I is correct but Statement II is incorrect

C)

Both Statement I and Statement II are incorrect

D)

Statement I is incorrect but Statement I is correct

Question 13

The number of integers, greater than 7000 that can be formed, using the digits 3, 5, 6, 7, 8 without repetition is :

Options:

A)

48

B)

120

C)

168

D)

220

Question 14

Let α=4i^+3j^+5k^\overrightarrow \alpha = 4\widehat i + 3\widehat j + 5\widehat k and β=i^+2j^4k^\overrightarrow \beta = \widehat i + 2\widehat j - 4\widehat k. Let β1{\overrightarrow \beta _1} be parallel to α\overrightarrow \alpha and β2{\overrightarrow \beta _2} be perpendicular to α\overrightarrow \alpha . If β=β1+β2\overrightarrow \beta = {\overrightarrow \beta _1} + {\overrightarrow \beta _2}, then the value of 5β2.(i^+j^+k^)5{\overrightarrow \beta _2}\,.\left( {\widehat i + \widehat j + \widehat k} \right) is :

Options:

A)

9

B)

7

C)

6

D)

11

Question 15

Let the six numbers a1,a2,a3,a4,a5,a6\mathrm{a_1,a_2,a_3,a_4,a_5,a_6}, be in A.P. and a1+a3=10\mathrm{a_1+a_3=10}. If the mean of these six numbers is 192\frac{19}{2} and their variance is σ2\sigma^2, then 8σ2\sigma^2 is equal to :

Options:

A)

220

B)

210

C)

105

D)

200

Question 16

What is the number of unpaired electron(s) in the highest occupied molecular orbital of the following species : N2;N2+;O2;O2+\mathrm{{N_2};N_2^ + ;{O_2};O_2^ + } ?

Options:

A)

0, 1, 0, 1

B)

2, 1, 0, 1

C)

0, 1, 2, 1

D)

2, 1, 2, 1

Question 17

Choose the correct representation of conductometric titration of benzoic acid vs sodium hydroxide.

Options:

A)

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Electrochemistry Question 29 English Option 1

B)

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Electrochemistry Question 29 English Option 2

C)

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Electrochemistry Question 29 English Option 3

D)

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Electrochemistry Question 29 English Option 4

Question 18

A student has studied the decomposition of a gas AB3_3 at 25^\circC. He obtained the following data.

p (mm Hg) 50 100 200 400
relative t1/2_{1/2} (s) 4 2 1 0.5

The order of the reaction is

Options:

A)

2

B)

0.5

C)

1

D)

0 (zero)

Question 19

Which will undergo deprotonation most readily in the basic medium?

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Basics of Organic Chemistry Question 45 English

Options:

A)

a only

B)

Both a and c

C)

c only

D)

b only

Numerical TypeQuestion 20

Total number of tripeptides possible by mixing of valine and proline is ___________

Numerical TypeQuestion 21

Maximum number of isomeric monochloro derivatives which can be obtained from 2,2,5,5-tetramethylhexane by chlorination is _____________

Numerical TypeQuestion 22

Following figure shows spectrum of an ideal black body at four different temperatures. The number of correct statement/s from the following is ____________.

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Thermodynamics Question 26 English

A. \mathrm{T_4 > T_3 > T_2 > T_1}

B. The black body consists of particles performing simple harmonic motion.

C. The peak of the spectrum shifts to shorter wavelength as temperature increases.

D. T1v1=T2v2=T3v3{{{T_1}} \over {{v_1}}} = {{{T_2}} \over {{v_2}}} = {{{T_3}} \over {{v_3}}} \ne constant

E. The given spectrum could be explained using quantisation of energy.

Numerical TypeQuestion 23

The total pressure observed by mixing two liquids A and B is 350 mm Hg when their mole fractions are 0.7 and 0.3 respectively.

The total pressure becomes 410 mm Hg if the mole fractions are changed to 0.2 and 0.8 respectively for A and B. The vapour pressure of pure A is __________ mm Hg. (Nearest integer)

Consider the liquids and solutions behave ideally.

Numerical TypeQuestion 24

If the pKa of lactic acid is 5, then the pH of 0.005 M calcium lactate solution at 25^\circC is ___________ ×\times 101^{-1} (Nearest integer)

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Ionic Equilibrium Question 14 English

Question 25

The set of all values of aa for which limxa([x5][2x+2])=0\mathop {\lim }\limits_{x \to a} ([x - 5] - [2x + 2]) = 0, where [α\alpha] denotes the greatest integer less than or equal to α\alpha is equal to

Options:

A)

[7.5,6.5][-7.5,-6.5]

B)

(7.5,6.5](-7.5,-6.5]

C)

[7.5,6.5)[-7.5,-6.5)

D)

(7.5,6.5)(-7.5,-6.5)

Question 26

The number of square matrices of order 5 with entries from the set {0, 1}, such that the sum of all the elements in each row is 1 and the sum of all the elements in each column is also 1, is :

Options:

A)

125

B)

150

C)

225

D)

120

Question 27

If f(x)=x3x2f(1)+xf(2)f(3),xRf(x) = {x^3} - {x^2}f'(1) + xf''(2) - f'''(3),x \in \mathbb{R}, then

Options:

A)

2f(0)f(1)+f(3)=f(2)2f(0) - f(1) + f(3) = f(2)

B)

f(1)+f(2)+f(3)=f(0)f(1) + f(2) + f(3) = f(0)

C)

f(3)f(2)=f(1)f(3) - f(2) = f(1)

D)

3f(1)+f(2)=f(3)3f(1) + f(2) = f(3)

Numerical TypeQuestion 28

The minimum number of elements that must be added to the relation R = {(a, b), (b, c), (b, d)} on the set {a, b, c, d} so that it is an equivalence relation, is __________.

Numerical TypeQuestion 29

If the shortest between the lines x+62=y63=z64{{x + \sqrt 6 } \over 2} = {{y - \sqrt 6 } \over 3} = {{z - \sqrt 6 } \over 4} and xλ3=y264=z+265{{x - \lambda } \over 3} = {{y - 2\sqrt 6 } \over 4} = {{z + 2\sqrt 6 } \over 5} is 6, then the square of sum of all possible values of λ\lambda is :

Numerical TypeQuestion 30

Let the sum of the coefficients of the first three terms in the expansion of (x3x2)n,x0. nN{\left( {x - {3 \over {{x^2}}}} \right)^n},x \ne 0.~n \in \mathbb{N}, be 376. Then the coefficient of x4x^4 is __________.

Question 31

The number of s-electrons present in an ion with 55 protons in its unipositive state is

Options:

A)

10

B)

9

C)

12

D)

8

Question 32

Which one amongst the following are good oxidizing agents?

A. Sm2+^{2+}

B. Ce2+^{2+}

C. Ce4+^{4+}

D. Tb4+^{4+}

Choose the most appropriate answer from the options given below :

Options:

A)

C and D only

B)

A and B only

C)

D only

D)

C only

Question 33

The hybridization and magnetic behaviour of cobalt ion in [Co(NH3)6]3+\mathrm{[Co(NH_3)_6]^{3+}} complex, respectively is :

Options:

A)

sp3d2\mathrm{sp^3d^2} and paramagnetic

B)

sp3d2\mathrm{sp^3d^2} and diamagnetic

C)

d2sp3\mathrm{d^2sp^3} and diamagnetic

D)

d2sp3\mathrm{d^2sp^3} and paramagnetic

Question 34

K2Cr2O7\mathrm{K_2Cr_2O_7} paper acidified with dilute H2SO4\mathrm{H_2SO_4} turns green when exposed to :

Options:

A)

Sulphur dioxide

B)

Sulphur trioxide

C)

Hydrogen sulphide

D)

Carbon dioxide

Question 35

Which of the following cannot be explained by crystal field theory?

Options:

A)

The order of spectrochemical series

B)

Stability of metal complexes

C)

Magnetic properties of transition metal complexes

D)

Colour of metal complexes

Question 36

The number of real solutions of the equation 3(x2+1x2)2(x+1x)+5=03\left( {{x^2} + {1 \over {{x^2}}}} \right) - 2\left( {x + {1 \over x}} \right) + 5 = 0, is

Options:

A)

3

B)

4

C)

0

D)

2

Question 37

If the system of equations

x+2y+3z=3x+2y+3z=3

4x+3y4z=44x+3y-4z=4

8x+4yλz=9+μ8x+4y-\lambda z=9+\mu

has infinitely many solutions, then the ordered pair (λ,μ\lambda,\mu) is equal to :

Options:

A)

(725,215)\left( {{{72} \over 5},{{21} \over 5}} \right)

B)

(725,215)\left( { - {{72} \over 5}, - {{21} \over 5}} \right)

C)

(725,215)\left( { - {{72} \over 5},{{21} \over 5}} \right)

D)

(725,215)\left( {{{72} \over 5}, - {{21} \over 5}} \right)

Question 38

The locus of the mid points of the chords of the circle C1:(x4)2+(y5)2=4{C_1}:{(x - 4)^2} + {(y - 5)^2} = 4 which subtend an angle θi{\theta _i} at the centre of the circle C1C_1, is a circle of radius rir_i. If θ1=π3,θ3=2π3{\theta _1} = {\pi \over 3},{\theta _3} = {{2\pi } \over 3} and r12=r22+r32r_1^2 = r_2^2 + r_3^2, then θ2{\theta _2} is equal to :

Options:

A)

π2{\pi \over 2}

B)

π4{\pi \over 4}

C)

3π4{{3\pi } \over 4}

D)

π6{\pi \over 6}

Question 39

If f(x)=22x22x+2,xRf(x) = {{{2^{2x}}} \over {{2^{2x}} + 2}},x \in \mathbb{R}, then f(12023)+f(22023)+...+f(20222023)f\left( {{1 \over {2023}}} \right) + f\left( {{2 \over {2023}}} \right)\, + \,...\, + \,f\left( {{{2022} \over {2023}}} \right) is equal to

Options:

A)

2011

B)

2010

C)

1010

D)

1011

Question 40

The value of (1+sin2π9+icos2π91+sin2π9icos2π9)3{\left( {{{1 + \sin {{2\pi } \over 9} + i\cos {{2\pi } \over 9}} \over {1 + \sin {{2\pi } \over 9} - i\cos {{2\pi } \over 9}}}} \right)^3} is

Options:

A)

12(1i3) - {1 \over 2}\left( {1 - i\sqrt 3 } \right)

B)

12(3i) - {1 \over 2}\left( {\sqrt 3 - i} \right)

C)

12(1i3){1 \over 2}\left( {1 - i\sqrt 3 } \right)

D)

12(3+i){1 \over 2}\left( {\sqrt 3 + i} \right)

Question 41

3243344894x2dx\int\limits_{{{3\sqrt 2 } \over 4}}^{{{3\sqrt 3 } \over 4}} {{{48} \over {\sqrt {9 - 4{x^2}} }}dx} is equal to :

Options:

A)

π2{\pi \over 2}

B)

π3{\pi \over 3}

C)

π6{\pi \over 6}

D)

2π2\pi

Numerical TypeQuestion 42

The equations of the sides AB, BC and CA of a triangle ABC are : 2x+y=0,x+py=21a,(a±0)2x+y=0,x+py=21a,(a\pm0) and xy=3x-y=3 respectively. Let P(2, a) be the centroid of Δ\DeltaABC. Then (BC)2^2 is equal to ___________.

Numerical TypeQuestion 43

Three urns A, B and C contain 4 red, 6 black; 5 red, 5 black; and λ\lambda red, 4 black balls respectively. One of the urns is selected at random and a ball is drawn. If the ball drawn is red and the probability that it is drawn from urn C is 0.4 then the square of the length of the side of the largest equilateral triangle, inscribed in the parabola y2=λxy^2=\lambda x with one vertex at the vertex of the parabola, is :

Numerical TypeQuestion 44

If the area of the region bounded by the curves y22y=x,x+y=0y^2-2y=-x,x+y=0 is A, then 8 A is equal to __________

Question 45

A cell of emf 90 V is connected across series combination of two resistors each of 100Ω\Omega resistance. A voltmeter of resistance 400Ω\Omega is used to measure the potential difference across each resistor. The reading of the voltmeter will be :

Options:

A)

40 V

B)

90 V

C)

45 V

D)

80 V

Question 46

The electric field and magnetic field components of an electromagnetic wave going through vacuum is described by

Ex=Eosin(kzωt)\mathrm{{E_x} = {E_o}\sin (kz - \omega t)}

By=Bosin(kzωt)\mathrm{{B_y} = {B_o}\sin (kz - \omega t)}

Then the correct relation between E0_0 and B0_0 is given by

Options:

A)

EoBo=ωk\mathrm{{E_o}{B_o} = \omega k}

B)

E0=kB0\mathrm{{E_0} = k{B_0}}

C)

kE0=ωB0\mathrm{k{E_0} = \omega {B_0}}

D)

ωE0=kB0\mathrm{\omega {E_0} = k{B_0}}

Question 47

If the distance of the earth from Sun is 1.5 ×\times 106^6 km. Then the distance of an imaginary planet from Sun, if its period of revolution is 2.83 years is :

Options:

A)

6×1066\times10^6 km

B)

3×1073\times10^7 km

C)

6×1076\times10^7 km

D)

3×1063\times10^6 km

Question 48

The frequency (ν\nu) of an oscillating liquid drop may depend upon radius (rr) of the drop, density (ρ\rho) of liquid and the surface tension (s) of the liquid as ν=raρbsc\nu=r^a\rho^b s^c. The values of a, b and c respectively are

Options:

A)

(32,12,12)\left( {{3 \over 2},{1 \over 2}, - {1 \over 2}} \right)

B)

(32,12,12)\left( { - {3 \over 2}, - {1 \over 2},{1 \over 2}} \right)

C)

(32,12,12)\left( {{3 \over 2}, - {1 \over 2},{1 \over 2}} \right)

D)

(32,12,12)\left( { - {3 \over 2},{1 \over 2},{1 \over 2}} \right)

Numerical TypeQuestion 49

The energy released per fission of nucleus of 240^{240}X is 200 MeV. The energy released if all the atoms in 120g of pure 240^{240}X undergo fission is ____________ ×\times 1025^{25} MeV.

(Given NA=6×1023\mathrm{N_A=6\times10^{23}})

Numerical TypeQuestion 50

A parallel plate capacitor with air between the plate has a capacitance of 15pF. The separation between the plate becomes twice and the space between them is filled with a medium of dielectric constant 3.5. Then the capacitance becomes x4\frac{x}{4} pF. The value of xx is ____________.

Numerical TypeQuestion 51

A Spherical ball of radius 1mm and density 10.5 g/cc is dropped in glycerine of coefficient of viscosity 9.8 poise and density 1.5 g/cc. Viscous force on the ball when it attains constant velocity is 3696×10x3696\times10^{-x} N. The value of xx is ________.

(Given, g = 9.8 m/s2^2 and π=227\pi=\frac{22}{7})

Numerical TypeQuestion 52

A mass m attached to free end of a spring executes SHM with a period of 1s. If the mass is increased by 3 kg the period of the oscillation increases by one second, the value of mass m is ___________ kg.

Question 53

When a beam of white light is allowed to pass through convex lens parallel to principal axis, the different colours of light converge at different point on the principle axis after refraction. This is called :

Options:

A)

Spherical aberration

B)

Scattering

C)

Polarisation

D)

Chromatic aberration

Question 54

In an Isothermal change, the change in pressure and volume of a gas can be represented for three different temperature; T3>T2>T1\mathrm{T_3 > T_2 > T_1} as :

Options:

A)

JEE Main 2023 (Online) 24th January Evening Shift Physics - Heat and Thermodynamics Question 53 English Option 1

B)

JEE Main 2023 (Online) 24th January Evening Shift Physics - Heat and Thermodynamics Question 53 English Option 2

C)

JEE Main 2023 (Online) 24th January Evening Shift Physics - Heat and Thermodynamics Question 53 English Option 3

D)

JEE Main 2023 (Online) 24th January Evening Shift Physics - Heat and Thermodynamics Question 53 English Option 4

Question 55

The velocity time graph of a body moving in a straight line is shown in the figure.

JEE Main 2023 (Online) 24th January Evening Shift Physics - Motion Question 31 English

The ratio of displacement to distance travelled by the body in time 0 to 10s is :

Options:

A)

1 : 1

B)

1 : 3

C)

1 : 4

D)

1 : 2

Question 56

JEE Main 2023 (Online) 24th January Evening Shift Physics - Semiconductor Question 26 English

The logic gate equivalent to the given circuit diagram is :

Options:

A)

NOR

B)

OR

C)

NAND

D)

AND

Question 57

An α\alpha-particle, a proton and an electron have the same kinetic energy. Which one of the following is correct in case of their de-Broglie wavelength:

Options:

A)

λα>λp<λe{\lambda _\alpha } > {\lambda _p} < {\lambda _e}

B)

λα>λp>λe{\lambda _\alpha } > {\lambda _p} > {\lambda _e}

C)

λα=λp=λe{\lambda _\alpha } = {\lambda _p} = {\lambda _e}

D)

λα<λp<λe{\lambda _\alpha } < {\lambda _p} < {\lambda _e}

Question 58

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : A pendulum clock when taken to Mount Everest becomes fast.

Reason R : The value of g (acceleration due to gravity) is less at Mount Everest than its value on the surface of earth.

In the light of the above statements, choose the most appropriate answer from the options given below

Options:

A)

Both A and R are correct but R is NOT the correct explanation of A

B)

A is correct but R is not correct

C)

Both A and R are correct and R is the correct explanation of A

D)

A is not correct but R is correct

Question 59

Let γ1\gamma_1 be the ratio of molar specific heat at constant pressure and molar specific heat at constant volume of a monoatomic gas and γ2\gamma_2 be the similar ratio of diatomic gas. Considering the diatomic gas molecule as a rigid rotator, the ratio, γ1γ2\frac{\gamma_1}{\gamma_2} is :

Options:

A)

3527\frac{35}{27}

B)

2521\frac{25}{21}

C)

2125\frac{21}{25}

D)

2735\frac{27}{35}

Question 60

The electric potential at the centre of two concentric half rings of radii R1_1 and R2_2, having same linear charge density λ\lambda is :

JEE Main 2023 (Online) 24th January Evening Shift Physics - Electrostatics Question 36 English

Options:

A)

λ20\frac{\lambda}{2\in_0}

B)

λ0\frac{\lambda}{\in_0}

C)

2λ0\frac{2\lambda}{\in_0}

D)

λ40\frac{\lambda}{4\in_0}

Question 61

A photon is emitted in transition from n = 4 to n = 1 level in hydrogen atom. The corresponding wavelength for this transition is (given, h = 4 ×\times 1015^{-15} eVs) :

Options:

A)

99.3 nm

B)

94.1 nm

C)

974 nm

D)

941 nm

Question 62

A body of mass 200g is tied to a spring of spring constant 12.5 N/m, while the other end of spring is fixed at point O. If the body moves about O in a circular path on a smooth horizontal surface with constant angular speed 5 rad/s. Then the ratio of extension in the spring to its natural length will be :

Options:

A)

1 : 2

B)

2 : 3

C)

2 : 5

D)

1 : 1

Numerical TypeQuestion 63

A body of mass 1kg begins to move under the action of a time dependent force F=(ti^+3t2j^)\overrightarrow F = \left( {t\widehat i + 3{t^2}\,\widehat j} \right) N, where i^\widehat i and j^\widehat j are the unit vectors along xx and yy axis. The power developed by above force, at the time t = 2s, will be ____________ W.

Numerical TypeQuestion 64

A uniform solid cylinder with radius R and length L has moment of inertia I1_1, about the axis of the cylinder. A concentric solid cylinder of radius R=R2R'=\frac{R}{2} and length L=L2L'=\frac{L}{2} is carved out of the original cylinder. If I2_2 is the moment of inertia of the carved out portion of the cylinder then I1I2=\frac{I_1}{I_2}= __________.

(Both I1_1 and I2_2 are about the axis of the cylinder)

Numerical TypeQuestion 65

If a copper wire is stretched to increase its length by 20%. The percentage increase in resistance of the wire is __________%.

Question 66

A long solenoid is formed by winding 70 turns cm1^{-1}. If 2.0 A current flows, then the magnetic field produced inside the solenoid is ____________ (μ0=4π×107\mu_0=4\pi\times10^{-7} TmA1^{-1})

Options:

A)

88×10488\times10^{-4} T

B)

1232×1041232\times10^{-4} T

C)

176×104176\times10^{-4} T

D)

352×104352\times10^{-4} T

Question 67

A metallic rod of length 'L' is rotated with an angular speed of 'ω\omega' normal to a uniform magnetic field 'B' about an axis passing through one end of rod as shown in figure. The induced emf will be :

JEE Main 2023 (Online) 24th January Evening Shift Physics - Electromagnetic Induction Question 29 English

Options:

A)

12B2L2ω\mathrm{\frac{1}{2}B^2L^2\omega}

B)

12BL2ω\mathrm{\frac{1}{2}BL^2\omega}

C)

14BL2ω\mathrm{\frac{1}{4}BL^2\omega}

D)

14B2Lω\mathrm{\frac{1}{4}B^2L\omega}

Question 68

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

Assertion A : Steel is used in the construction of buildings and bridges.

Reason R : Steel is more elastic and its elastic limit is high.

In the light of above statements, choose the most appropriate answer from the options given below

Options:

A)

Both A and R are correct and R is the correct explanation of A

B)

A is correct but R is not correct

C)

Both A and R are correct but R is NOT the correct explanation of A

D)

A is not correct but R is correct

Question 69

Given below are two statements:

Statement I : Acceleration due to earth's gravity decreases as you go 'up' or 'down' from earth's surface.

Statement II : Acceleration due to earth's gravity is same at a height 'h' and depth 'd' from earth's surface, if h = d.

In the light of above statements, choose the most appropriate answer from the options given below

Options:

A)

Statement I is correct but statement II is incorect

B)

Both Statement I and II are correct

C)

Statement I is incorrect but statement II is correct

D)

Both Statement I and Statement II are incorrect

Question 70

If two vectors P=i^+2mj^+mk^\overrightarrow P = \widehat i + 2m\widehat j + m\widehat k and Q=4i^2j^+mk^\overrightarrow Q = 4\widehat i - 2\widehat j + m\widehat k are perpendicular to each other. Then, the value of m will be :

Options:

A)

1-1

B)

3

C)

1

D)

2

Numerical TypeQuestion 71

A convex lens of refractive index 1.5 and focal length 18cm in air is immersed in water. The change in focal length of the lens will be ___________ cm.

(Given refractive index of water =43=\frac{4}{3})

Numerical TypeQuestion 72

A single turn current loop in the shape of a right angle triangle with sides 5 cm, 12 cm, 13 cm is carrying a current of 2 A. The loop is in a uniform magnetic field of magnitude 0.75 T whose direction is parallel to the current in the 13 cm side of the loop. The magnitude of the magnetic force on the 5 cm side will be x130\frac{x}{130} N. The value of xx is ____________.

Numerical TypeQuestion 73

Three identical resistors with resistance R = 12Ω\Omega and two identical inductors with self inductance L = 5 mH are connected to an ideal battery with emf of 12 V as shown in figure. The current through the battery long after the switch has been closed will be _____________ A.

JEE Main 2023 (Online) 24th January Evening Shift Physics - Electromagnetic Induction Question 30 English