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Past papers
JEE Main 2020
2 Sep, Evening shift
Physics
14
Chemistry
15
Mathematics
25
Physics
Q46
A light ray enters a solid glass sphere of refractive index μ = 3 at an angle of incidence 60^(o). The ray is both reflected and refracted at the farther…
Optics
Q50
A wire of density 9 × 10^–3 kg cm^–3 is stretched between two clamps 1 m apart. The resulting strain in the wire is 4.9 × 10^–4. The lowest frequency of the…
Properties of Solids and Liquids
Q5882
An inductance coil has a reactance of 100 Ω. When an AC signal of frequency 1000 Hz is applied to the coil, the applied voltage leads the current by 45^(o)…
Electromagnetic Induction and Alternating Currents
Q5997
In a hydrogen atom the electron makes a transition from (n + 1)^(t)h level to the n^(t)h level. If n >> 1, the frequency of radiation emitted is proportional…
Atoms and Nuclei
Q6140
A 10 μ F capacitor is fully charged to a potential difference of 50 V. After removing the source voltage it is connected to an uncharged capacitor in…
Electrostatics
Q6548
A particle is moving 5 times as fast as an electron. The ratio of the de-Broglie wavelength of the particle to that of the electron is 1.878 × 10^–4. The mass…
Dual Nature of Matter and Radiation
Q6771
In a plane electromagnetic wave, the directions of electric field and magnetic field are represented by k and 2 i - 2 j, respectively. What is the unit vector…
Electromagnetic Waves
Q7136
The height ‘h’ at which the weight of a body will be the same as that at the same depth ‘h’ from the surface of the earth is (Radius of the earth is R and…
Gravitation
Q7377
An ideal gas in a closed container is slowly heated. As its temperature increases, which of the following statements are true? (A) the mean free path of the…
Kinetic Theory of Gases
Q7519
When the temperature of a metal wire is increased from 0^(o)C to 10^(o)C, its length increases by 0.02%. The percentage change in its mass density will be…
Thermodynamics
Q8012
A capillary tube made of glass of radius 0.15 mm is dipped vertically in a beaker filled with methylene iodide (surface tension = 0.05 Nm^–1, density = 667 kg…
Properties of Solids and Liquids
Q8053
Two uniform circular discs are rotating independently in the same direction around their common axis passing through their centres. The moment of inertia and…
Rotational Motion
Q8237
If momentum (P), area (A) and time (T) are taken to be the fundamental quantities then the dimensional formula for energy is
Units and Measurements
Q8428
In a Young’s double slit experiment, 16 fringes are observed in a certain segment of the screen when light of a wavelength 700 nm is used. If the wavelength…
Optics
Chemistry
Q5
For the disproportionation reaction 2Cu⁺(aq) ⇌ Cu(s) + Cu²⁺(aq) at 298 K. ln K (where K is the equilibrium constant) is _ _ _ _ _ _ × 10^–1. Given: (E_ C u²⁺…
Redox Reactions and Electrochemistry
Q9
The oxidation states of transition metal atoms in K₂Cr₂O₇, KMnO₄ and K₂FeO₄, respectively, are x, y and z. The sum of x, y and z is _ _ _ _.
Redox Reactions and Electrochemistry
Q12
The ratio of the mass percentages of ‘C H’ and ‘C O’ of a saturated acyclic organic compound ‘X’ are 4: 1 and 3: 4 respectively. Then, the moles of oxygen gas…
Some Basic Concepts in Chemistry
Q13
The work function of sodium metal is 4.41 × 10^–19 J. If photons of wavelength 300 nm are incident on the metal, the kinetic energy of the ejected electrons…
Atomic Structure
Q15
The heat of combustion of ethanol into carbon dioxide and water is – 327 kcal at constant pressure. The heat evolved (in cal) at constant volume and 27^(o)C…
Chemical Thermodynamics
Q296
The molecular geometry of SF₆ is octahedral. What is the geometry of SF₄ (including lone pair(s) of electrons, if any)?
Chemical Bonding and Molecular Structure
Q298
The shape / structure of [XeF₅]^– and XeO₃F₂, respectively, are
Chemical Bonding and Molecular Structure
Q342
Match the type of interaction in column A with the distance dependence of their interaction energy in column B A B (i) ion-ion (a) 1/r (ii) dipole-dipole (b)…
Chemical Bonding and Molecular Structure
Q681
The one that is not expected to show isomerism is:
Coordination Compounds
Q1386
Cast iron is used for the manufacture of:
Isolation of Elements
Q1634
Three elements X, Y and Z are in the 3^(r)d period of the periodic table. The oxides of X, Y and Z, respectively, are basic, amphoteric and acidic. The…
Classification of Elements and Periodicity in Properties
Q1726
If you spill a chemical toilet cleaning liquid on your hand, your first aid would be
Principles Related to Practical Chemistry
Q1880
Two elements A and B have similar chemical properties. They don’t form solid hydrogencarbonates, but react with nitrogen to form nitrides. A and B…
S Block Elements
Q1994
The size of a raw mango shrinks to a much smaller size when kept in a concentrated salt solution. Which one of the following processes can explain this?
Solutions
Q2201
The number of subshells associated with n = 4 and m = –2 quantum numbers is
Atomic Structure
Mathematics
Q20
For a positive integer n, (1 + 1/x)ⁿ is expanded in increasing powers of x. If three consecutive coefficients in this expansion are in the ratio, 2: 5: 12…
Binomial Theorem and Its Simple Applications
Q22
Let [t] denote the greatest integer less than or equal to t. Then the value of ∫₁² | 2x - [ 3x ] |dx is _ _ _.
Integral Calculus
Q24
If y = Σ k = 1 ⁶ k cos ⁻¹ 3/5 cos kx - 4/5 sin kx \, then dy/dx at x = 0 is _ _ _ _.
Limit, Continuity and Differentiability
Q37
If the variance of the terms in an increasing A.P., b₁, b₂, b₃,....,b₁₁ is 90, then the common difference of this A.P. is _ _ _ _.
Statistics and Probability
Q40
Let the position vectors of points 'A' and 'B' be i + j + k and 2 i + j + 3 k, respectively. A point 'P' divides the line segment AB internally in the ratio…
Vector Algebra
Q2423
A plane passing through the point (3, 1, 1) contains two lines whose direction ratios are 1, –2, 2 and 2, 3, –1 respectively. If this plane also passes…
Three Dimensional Geometry
Q2714
Let f: (–1, ∞) → R be defined by f(0) = 1 and f(x) = 1/x log e (1 + x), x ≠ 0. Then the function f:
Limit, Continuity and Differentiability
Q2778
The equation of the normal to the curve y = (1+x)²y + cos ²(sin^–1x) at x = 0 is:
Limit, Continuity and Differentiability
Q2826
Consider a region R = (x, y) R: x² ≤ y ≤ 2x. if a line y = α divides the area of region R into two equal parts, then which of the following is true?
Integral Calculus
Q3278
The imaginary part of (3 + 2√(- 54))^(1/2) - (3 - 2√(- 54))^(1/2) can be:
Complex Numbers and Quadratic Equations
Q3604
If a curve y = f(x), passing through the point (1, 2), is the solution of the differential equation, 2x²dy= (2xy + y²)dx, then f(1/2) is equal to:
Differential Equations
Q3864
Let f: R → R be a function which satisfies f(x + y) = f(x) + f(y) x, y R. If f(1) = 2 and g(n) = Σ k = 1 ^((n - 1)) f(k), n N then the value of n, for which…
Sets, Relations and Functions
Q3969
For some θ (0,(π)/2), if the eccentricity of the hyperbola, x²–y²sec² θ = 10 is 5 times the eccentricity of the ellipse, x²sec² θ + y² = 5, then the length of…
Coordinate Geometry
Q4252
lim x → 0 (tan ((π)/4 + x))^(1/x) is equal to:
Limit, Continuity and Differentiability
Q4338
Which of the following is a tautology ?
Mathematical Reasoning
Q4580
Let A = X = (x, y, z)^(T): PX = 0 and x² + y² + z² = 1 where P = [ 1 2 1 - 2 3 - 4 1 9 - 1 ], then the set A:
Matrices and Determinants
Q4662
Let a, b, c R be all non-zero and satisfy a³ + b³ + c³ = 2. If the matrix A = (a b c b c a c a b) satisfies A^(T)A = I, then a value of abc can be:
Matrices and Determinants
Q4720
The area (in sq. units) of an equilateral triangle inscribed in the parabola y² = 8x, with one of its vertices on the vertex of this parabola, is:
Coordinate Geometry
Q4767
Let n > 2 be an integer. Suppose that there are n Metro stations in a city located along a circular path. Each pair of stations is connected by a straight…
Permutations and Combinations
Q4954
Let E^(C) denote the complement of an event E. Let E₁, E₂ and E₃ be any pairwise independent events with P(E₁) > 0 and P(E₁ E₂ E₃) = 0. Then P(E₂^(C)…
Statistics and Probability
Q5096
Let f(x) be a quadratic polynomial such that f(–1) + f(2) = 0. If one of the roots of f(x) = 0 is 3, then its other root lies in:
Complex Numbers and Quadratic Equations
Q5215
If the sum of first 11 terms of an A.P., a₁, a₂, a₃,.... is 0 (a ≠ 0), then the sum of the A.P., a₁, a₃, a₅,....., a₂₃ is ka₁, where k is equal to:
Sequence and Series
Q5314
Let S be the sum of the first 9 terms of the series: x + k a + x² + (k + 2) a + x³ + (k + 4) a + x⁴ + (k + 6) a +.... where a ≠ 0 and x ≠ 1. If S = (x¹⁰ - x +…
Sequence and Series
Q5582
The set of all possible values of θ in the interval (0, π) for which the points (1, 2) and (sin θ, cos θ) lie on the same side of the line x + y = 1 is:
Coordinate Geometry
Q5653
If the equation cos⁴ θ + sin⁴ θ + λ = 0 has real solutions for θ, then λ lies in the interval:
Trigonometry