JEE Main 2024 1 Feb Shift 1 Question Paper (Available)- Download Solution PDF with Answer Key

A bag contains 8 balls, whose colours are either white or black. 4 balls are drawn at random without replacement and it was found that 2 balls are white and other 2 balls are black. The probability that the bag contains equal number of white and black balls is:

• (1) 2/5
• (2) 2/7
• (3) 1/7
• (4) 1/5

The value of the integral ∫ (from 0 to π/4) of x dx / (sin⁴(2x) + cos⁴(2x)) equals:

• (1) √2π²/8
• (2) √2π²/16
• (3) √2π²/32
• (4) √2π²/64

If A = [[√2, 1], [-1, √2]], B = [[1, 0], [0, 1]], C = ABAT, and X = AT C² A, then det(X) is equal to:

• (1) 243
• (2) 729
• (3) 27
• (4) 891

If tan A = 1 / √(x(x² + x + 1)), tan B = √x / √(x² + x + 1), and tan C = √(x³ + x² + x)^1/2, 0 < A, B, C < π/2, then A + B is equal to:

• (1) C
• (2) π - C
• (3) 2π - C
• (4) π/2 - C

If n is the number of ways five different employees can sit into four indistinguishable offices where any office may have any number of persons including zero, then n is equal to:

• (1) 47
• (2) 53
• (3) 51
• (4) 43

Let S = {z ∈ C : |z − 1| = 1 and (√2 − 1)(z + z̄) = (z̄ − z) = 2√2}. Let z₁, z₂ ∈ S be such that |z₁| = maxz∈S |z| and |z₂| = minz∈S |z|. Then √|z₁ − z₂|² equals:

• (1) 1
• (2) 4
• (3) 3
• (4) 2

Let the median and the mean deviation about the median of 7 observations 170, 125, 230, 190, 210, a, b be 170 and 205/7 respectively. Then the mean deviation about the mean of these 7 observations is:

• (1) 31
• (2) 28
• (3) 30
• (4) 32

Let a⃗ = −5i⃗ + 3j⃗ − 3k⃗, b⃗ = i⃗ + 2j⃗ − 4k⃗ and c⃗ = ((a⃗ × b⃗) × i⃗) × i⃗. Then c⃗ · (−i⃗ + j⃗ + k⃗) is equal to:

• (1) -12
• (2) -10
• (3) -13
• (4) -15

Let S = {x ∈ R : (√3 + √2)^x + (√3 − √2)^x = 10}. Then the number of elements in S is:

• (1) 4
• (2) 0
• (3) 2
• (4) 1

The area enclosed by the curves ( xy + 4y = 16 ) and ( x + y = 6 ) is equal to:

• (1) 28 − 30 log 2
• (2) 30 − 28 log 2
• (3) 30 − 32 log 2
• (4) 32 − 30 log 2

The distance of the point (2, 3) from the line 2x − 3y + 28 = 0, measured parallel to the line √3x − y + 1 = 0, is equal to:
(1) 4√2
(2) 6√3
(3) 3 + 4√2
(4) 4 + 6√3

If sin(y/x) = ln|x| + α/2 is the solution of the differential equation x cos(y/x) dy/dx = y cos(y/x) + x, and y(1) = π/3, then α² is equal to:
(1) 3
(2) 12
(3) 4
(4) 9

If each term of a geometric progression a₁, a₂, a₃, ... with a₁ = 1/8 and a₂ ≠ a₁, is the arithmetic mean of the next two terms and Sₙ = a₁ + a₂ + ... + aₙ, then S₂₀ − S₁₈ is equal to:
(1) 2^15
(2) −2^18
(3) 2^18
(4) −2^15

Let A be the point of intersection of the lines 3x + 2y = 14 and 5x − y = 6, and B be the point of intersection of the lines 4x + 3y = 8 and 6x + y = 5. The distance of the point P(5, −2) from the line AB is:
(1) 13/2
(2) 8
(3) 5/2
(4) 6

Let x = m/n (m, n are co-prime natural numbers) be a solution of the equation cos(2 sin⁻¹ x) = 1/9, and let α, β (α > β) be the roots of the equation mx² − nx − m + n = 0. Then the point (α, β) lies on the line:
(1) 3x + 2y = 2
(2) 5x − 8y = −9
(3) 3x − 2y = −2
(4) 5x + 8y = 9

The function f(x) = x / (x² - 6x - 16), x ∈ R \ {−2, 8}, has:
(1) decreases in (−2, 8) and increases in (−∞, −2) ∪ (8, ∞)
(2) decreases in (−∞, −2) ∪ (−2, 8) ∪ (8, ∞)
(3) decreases in (−∞, −2) and increases in (8, ∞)
(4) increases in (−∞, −2) ∪ (−2, 8) ∪ (8, ∞)

Let y = ln((1 − x²) / (1 + x²)), −1 < x < 1. Then at x = 1/2, the value of 225(y' − y'') is equal to:
(1) 732
(2) 746
(3) 742
(4) 736

If R is the smallest equivalence relation on the set {1, 2, 3, 4} such that {(1, 2), (1, 3)} ⊆ R, then the number of elements in R is:
(1) 10
(2) 12
(3) 8
(4) 15

An integer is chosen at random from the integers 1, 2, 3, ..., 50. The probability that the chosen integer is a multiple of at least one of 4, 6, 7 is:
(1) 8/25
(2) 21/50
(3) 9/50
(4) 14/25

Let a unit vector u = xi + yj + zk make angles π/2, π/3, 2π/3 with the vectors p₁ = (1/√2)i + (1/√2)k, p₂ = (1/√2)j + (1/√2)k, and p₃ = (1/√2)i + (1/√2)j, respectively. If v = (1/√2)(i + j + k), then |u − v|² is equal to:
(1) 11/2
(2) 5/2
(3) 9
(4) 7

Let α, β be the roots of the equation x² − √6x + 3 = 0 such that Im(α) > Im(β). Let a, b be integers not divisible by 3 and n be a natural number such that αⁿ / β + α⁹⁹ + α⁹⁸ = 3ⁿ(a + ib), i = √−1. Then n + a + b is equal to:

Let for any three distinct consecutive terms a, b, c of an A.P., the lines ax + by + c = 0 be concurrent at the point P, and Q(α, β) be a point such that the system of equations x + y + z = 6, 2x + 5y + αz = β, x + 2y + 3z = 4 has infinitely many solutions. Then (PQ)² is equal to:

Let P(α, β) be a point on the parabola y² = 4x. If P also lies on the chord of the parabola x² = 8y whose midpoint is (1, 5/4), then (α − 28)(β − 8) is equal to:

If ∫ π/3 π/6 √1 − sin 2x dx = α + β√2 + γ√3, where α, β, γ are rational numbers, then 3α + 4β − γ is equal to:

Let the area of the region {(x, y) : 0 ≤ x ≤ 3, 0 ≤ y ≤ min(x² + 2, 2x + 2)} be A. Then 12A is equal to:

Let O be the origin, and M and N be the points on the lines:
x−5/4 = y−4/1 = z−5/3 and x+8/12 = y+2/5 = z+11/9,
respectively, such that MN is the shortest distance between the given lines. Then OM · ON is equal to:

Let f(x) = √lim(r→x) [2r²(f(r²) − f(x))f(r)/(r²−x²) − r²e^(f(r)/r)] be differentiable in (−∞, 0) ∪ (0,∞) and f(1) = 1. Then the value of eᵃ, such that f(a) = 0, is equal to:

Remainder when 64³²³² is divided by 9 is equal to:

Let the set C = {(x, y) | x² − 2y = 2023, x, y ∈ N}. Then ∑(x, y)∈C(x + y) is equal to:

Let the slope of the line 45x + 5y + 3 = 0 be 27r₁ + 9r₂² for some r₁, r₂ ∈ R. Then:
lim(x→3)∫(x to 3)(8t²/(3r₂x² − r₂x² − r₁x³ − 3x))dt is equal to:

Two sources of light emit with a power of 200 W. The ratio of the number of photons of visible light emitted by each source having wavelengths 300 nm and 500 nm respectively, will be:
(1) 1:5
(2) 1:3
(3) 5:3
(4) 3:5

The truth table for the given circuit is:
(1) 1
(2) 2
(3) 3
(4) 4

A physical quantity Q is found to depend on quantities a, b, c by the relation Q = a⁴b³/c². The percentage error in a, b, c are 3%, 4%, and 5% respectively. Then, the percentage error in Q is:
(1) 66%
(2) 43%
(3) 34%
(4) 14%

In an a.c. circuit, voltage and current are given by V = 100 sin(100t) V and I = 100 sin(100t + π/3) mA, respectively. The average power dissipated in one cycle is:
(1) 5 W
(2) 10 W
(3) 2.5 W
(4) 25 W

The temperature of a gas having 2.0×10²⁵ molecules per cubic meter at 1.38 atm (Given, k = 1.38×10⁻²³ JK⁻¹) is:
(1) 500 K
(2) 200 K
(3) 100 K
(4) 300 K

A stone of mass 900 g is tied to a string and moved in a vertical circle of radius 1 m making 10 rpm. The tension in the string, when the stone is at the lowest point, is:
(1) 97 N
(2) 9.8 N
(3) 8.82 N
(4) 17.8 N

The bob of a pendulum was released from a horizontal position. The length of the pendulum is 10 m. If it dissipates 10% of its initial energy against air resistance, the speed with which the bob arrives at the lowest point is:
(1) 6√5 m/s
(2) 5√6 m/s
(3) 5√5 m/s
(4) 2√5 m/s

If the distance between an object and its two-times magnified virtual image produced by a curved mirror is 15 cm, the focal length of the mirror must be:
(1) 15 cm
(2) −12 cm
(3) −10 cm
(4) 10/3 cm

Two particles X and Y having equal charges are being accelerated through the same potential difference. Thereafter, they enter normally in a region of uniform magnetic field and describe circular paths of radii R₁ and R₂, respectively. The mass ratio of X and Y is:
(1) (R₂/R₁)²
(2) (R₁/R₂)²
(3) R₁/R₂
(4) R₂/R₁

In Young’s double slit experiment, light from two identical sources is superimposing on a screen. The path difference between the two lights reaching a point on the screen is 7λ/4. The ratio of intensity of the fringe at this point with respect to the maximum intensity of the fringe is:
(1) 1/2
(2) 3/4
(3) 1/3
(4) 1/4

A small liquid drop of radius R is divided into 27 identical liquid drops. If the surface tension is T, then the work done in the process will be:
(1) 8πR²T
(2) 3πR²T
(3) 1/8πR²T
(4) 4πR²T

A bob of mass ‘m’ is suspended by a light string of length ‘L’. It is imparted a minimum horizontal velocity at the lowest point A such that it just completes a half-circle reaching the topmost position B. The ratio of kinetic energies (K.E.)_A : (K.E.)_B is:
(1) 3:2
(2) 5:1
(3) 2:5
(4) 1:5

A wire of length L and radius r is clamped at one end. If its other end is pulled by a force F, its length increases by l. If the radius of the wire and the applied force are both reduced to half of their original values, keeping the original length constant, the increase in length will become:
(1) 3 times
(2) 3/2 times
(3) 4 times
(4) 2 times

A planet takes 200 days to complete one revolution around the Sun. If the distance of the planet from the Sun is reduced to one-fourth of the original distance, how many days will it take to complete one revolution?
(1) 25
(2) 50
(3) 100
(4) 20

A plane electromagnetic wave of frequency 35 MHz travels in free space along the X-direction. At a particular point (in space and time), E = 9.6 j V/m. The value of the magnetic field at this point is:
(1) 3.2×10⁻⁸ kT
(2) 3.2×10⁻⁸ iT
(3) 9.6 jT
(4) 9.6×10⁻⁸ kT

In the given circuit, the current in resistance R₃ is:
(1) 1 A
(2) 1.5 A
(3) 2 A
(4) 2.5 A

A particle is moving in a straight line. The variation of position x as a function of time t is given as x = (t³ − 6t² + 20t + 15) m. The velocity of the body when its acceleration becomes zero is:
(1) 4 m/s
(2) 8 m/s
(3) 10 m/s
(4) 6 m/s

N moles of a polyatomic gas (f = 6) must be mixed with two moles of a monoatomic gas so that the mixture behaves as a diatomic gas. The value of N is:
(1) 6
(2) 3
(3) 4
(4) 2

Given below are two statements:
Statement I: Most of the mass of the atom and all its positive charge are concentrated in a tiny nucleus and the electrons revolve around it, is Rutherford’s model.
Statement II: An atom is a spherical cloud of positive charges with electrons embedded in it, is a special case of Rutherford’s model.
(1) Both Statement I and Statement II are false
(2) Statement I is false but Statement II is true
(3) Statement I is true but Statement II is false
(4) Both Statement I and Statement II are true

An electric field is given by E = (6i + 5j + 3k) N/C. The electric flux through a surface area 30i m² lying in the YZ-plane (in SI units) is:
(1) 90
(2) 150
(3) 180
(4) 60

Two metallic wires P and Q have the same volume and are made up of the same material. If their areas of cross-section are in the ratio 4:1 and force F₁ is applied to P, an extension of Δℓ is produced. The force required to produce the same extension in Q is F₂. The value of F₁/F₂ is:
(1) 16
(2) 3
(3) 2
(4) 4

A horizontal straight wire 5 m long extending from east to west falls freely at a right angle to the horizontal component of Earth’s magnetic field 0.60 × 10⁻⁴ Wb/m². The instantaneous value of emf induced in the wire when its velocity is 10 m/s is:
(1) 3 × 10⁻³ V
(2) 6 × 10⁻³ V
(3) 9 × 10⁻³ V
(4) 2 × 10⁻³ V

Hydrogen atom is bombarded with electrons accelerated through a potential difference V, which causes excitation of hydrogen atoms. If the experiment is performed at T = 0 K, the minimum potential difference needed to observe any Balmer series lines in the emission spectra will be α/10 V, where α is:
(1) 121
(2) 150
(3) 135
(4) 110

A charge of 4.0 µC is moving with a velocity of 4.0 × 10⁶ m/s along the positive y-axis under a magnetic field B of strength 2k̂ T. The force acting on the charge is xî N. The value of x is:
(1) 32 N
(2) 24 N
(3) 20 N
(4) 16 N

A simple harmonic oscillator has an amplitude A and a time period 6π seconds. Assuming the oscillation starts from its mean position, the time required by it to travel from x = A to x = √3/2 A will be π/x seconds, where x is:
(1) 3
(2) 5
(3) 2
(4) 4

In the given figure, the charge stored in a 6µF capacitor, when points A and B are joined by a connecting wire, is µC:

In a single slit diffraction pattern, a light of wavelength 6000 Å is used. The distance between the first and third minima in the diffraction pattern is found to be 3 mm when the screen is placed 50 cm away from the slits. The width of the slit is ×10⁻⁴ m:

In the given circuit, the current flowing through the resistance 20Ω is 0.3A, while the ammeter reads 0.9A. The value of R₁ is Ω:

A particle is moving in a circle of radius 50 cm in such a way that at any instant the normal and tangential components of its acceleration are equal. If its speed at t = 0 is 4 m/s, the time taken to complete the first revolution will be 1/α [1 − e⁻²π] seconds, where α is:

A body of mass 5 kg moving with a uniform speed 3√2 m/s in the X-Y plane along the line y = x + 4. The angular momentum of the particle about the origin will be kg·m²/s:

The ascending acidity order of the following H atoms is:
(1) C < D < B < A
(2) A < B < C < D
(3) A < B < D < C
(4) D < C < B < A

Match List I with List II:
List I (Bio Polymer) | List II (Monomer)
A. Starch   |   I. Nucleotide
B. Cellulose   |   II. α-glucose
C. Nucleic acid   |   III. β-glucose
D. Protein   |   IV. α-amino acid
(1) A-II, B-I, C-III, D-IV
(2) A-IV, B-II, C-I, D-III
(3) A-I, B-III, C-IV, D-II
(4) A-II, B-III, C-I, D-IV

Match List I with List II:
List I (Compound) | List II (pKa value)
A. Ethanol   |   II. 15.9
B. Phenol   |   I. 10.0
C. m-Nitrophenol   |   IV. 8.3
D. p-Nitrophenol   |   III. 7.1
(1) A-I, B-II, C-III, D-IV
(2) A-IV, B-I, C-II, D-III
(3) A-III, B-IV, C-I, D-II
(4) A-II, B-I, C-IV, D-III

Which of the following reaction is correct?
(1) Incorrect reaction
(2) Correct reaction
(3) Partially correct reaction
(4) Not a valid reaction

According to IUPAC system, the compound is named as:
(1) Cyclohex-1-en-2-ol
(2) 1-Hydroxyhex-2-ene
(3) Cyclohex-1-en-3-ol
(4) Cyclohex-2-en-1-ol

The correct IUPAC name of K₂MnO₄ is:
(1) Potassium tetraoxopermanganate (VI)
(2) Potassium tetraoxidomanganate (VI)
(3) Dipotassium tetraoxidomanganate (VII)
(4) Potassium tetraoxidomanganese (VI)

A reagent which gives a brilliant red precipitate with Nickel ions in a basic medium is:

Phenol treated with chloroform in the presence of sodium hydroxide, followed by hydrolysis with acid, results in:

Match List I with List II:
List I (Spectral Series for Hydrogen) | List II (Spectral Region)
A. Lyman   |   I. Infrared region
B. Balmer   |   II. UV region
C. Paschen   |   III. Infrared region
D. Pfund   |   IV. Visible region
(1) A-II, B-III, C-I, D-IV
(2) A-I, B-III, C-II, D-IV
(3) A-II, B-IV, C-III, D-I
(4) A-I, B-II, C-III, D-IV

On passing a gas, ‘X,’ through Nessler’s reagent, a brown precipitate is obtained. The gas ‘X’ is:

The product A formed in the following reaction is:

Identify the reagents used for the following conversion:
(1) A = LiAlH₄, B = NaOH(aq), C = NH₂NH₂/KOH
(2) A = LiAlH₄, B = NaOH(alc), C = Zn/HCl
(3) A = DIBAL-H, B = NaOH(aq), C = NH₂NH₂/KOH
(4) A = DIBAL-H, B = NaOH(alc), C = Zn/HCl

Which of the following acts as a strong reducing agent? (Atomic numbers: Ce = 58, Eu = 63, Gd = 64, Lu = 71)
(1) Lu³⁺
(2) Gd³⁺
(3) Eu²⁺
(4) Ce⁴⁺

Chromatographic technique(s) based on the principle of differential adsorption is/are:
A. Column chromatography
B. Thin layer chromatography
C. Paper chromatography
(1) B only
(2) A only
(3) A & B only
(4) C only

Which of the following statements are correct about Zn, Cd, and Hg?
A. They exhibit high enthalpy of atomization as the d-subshell is full.
B. Zn and Cd do not show variable oxidation state while Hg shows +1 and +2.
C. Compounds of Zn, Cd, and Hg are paramagnetic in nature.
D. Zn, Cd, and Hg are called soft metals.
(1) B, D only
(2) B, C only
(3) A, D only
(4) C, D only

The element having the highest first ionization enthalpy is:
(1) Si
(2) Al
(3) N
(4) C

Alkyl halide is converted into alkyl isocyanide by reaction with:

1. NaCN
2. NH₄CN
3. KCN
4. AgCN

Which one of the following will show geometrical isomerism?

1. CH₃CH=CHCH₃
2. CH₂=CBr₂
3. CH₃CH=CHBr
4. Cyclohexane

Given below are two statements:
Statement I: Fluorine has the most negative electron gain enthalpy in its group.
Statement II: Oxygen has the least negative electron gain enthalpy in its group.
In the light of the above statements, choose the most appropriate option from the options given below:

1. Both Statement I and Statement II are true
2. Statement I is true but Statement II is false
3. Both Statement I and Statement II are false
4. Statement I is false but Statement II is true

Anomalous behavior of oxygen is due to its:

1. Large size and high electronegativity
2. Small size and low electronegativity
3. Small size and high electronegativity
4. Large size and low electronegativity

The total number of antibonding molecular orbitals formed from 2s and 2p atomic orbitals in a diatomic molecule is:

1. 1
2. 2
3. 3
4. 4

The oxidation number of iron in the compound formed during the brown ring test for NO₃⁻ ion is:

1. +3
2. +2
3. +1
4. 0

The equilibrium constant for the formation of NH₃ from N₂ and H₂, given [N₂] = 2×10⁻² M, [H₂] = 3×10⁻² M, [NH₃] = 1.5×10⁻² M at 500 K, is:

1. 417
2. 4170
3. 41.7
4. 4.17

The molality of a 0.8 M H₂SO₄ solution with density 1.06 g/cm³ is:

1. 815 × 10⁻³ m
2. 0.815 m
3. 1.5 m
4. 0.5 m

The amount of NaOH in 50 mL of a solution neutralized by 50 mL of 0.5 M oxalic acid is:

1. 4 g
2. 2 g
3. 8 g
4. 16 g

The total number of sigma (σ) and pi (π) bonds in 2-formylhex-4-enoic acid is:

1. 22
2. 18
3. 20
4. 25

The half-life of radioisotopic bromine-82 is 36 hours. The fraction that remains after one day is:

1. 0.63
2. 0.5
3. 0.75
4. 0.25

Standard enthalpy of vaporization for CCl₄ is 30.5 kJ/mol. Heat required for vaporization of 284 g of CCl₄ at constant temperature is:

1. 56 kJ
2. 45 kJ
3. 65 kJ
4. 60 kJ

A constant current was passed through a solution of AuCl₄⁻ ions between gold electrodes. After 10 minutes, the increase in the cathode’s mass was 1.314 g. The total charge passed through the solution is:

1. 2 F
2. 4 F
3. 6 F
4. 8 F

The total number of molecules with zero dipole moment among CH₄, BF₃, H₂O, HF, NH₃, CO₂, and SO₂ is:

1. 3
2. 2
3. 4
4. 5