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JEE Mains 2026 (23 Jan, Shift 1), Paper 1 (B.E./B.Tech) question paper

75 questions · 300 marks · 180 minutes · +4 per correct answer, -1 per wrong one

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Physics

25 questions

  1. 1
    A thin prism with angle 5∘5^{\circ} of refractive index 1.72 is combined with another prism of refractive index 1.9 to produce dispersion without deviation. The angle of second prism is ____\_\_\_\_ .

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  2. 2
    A small bob A of mass m is attached to a massless rigid rod of length 1 m pivoted at point P and kept at an angle of 60∘60^{\circ} with vertical as shown in figure. At distance of 1 m below point P, an identical bob B is kept at rest on a smooth horizontal surface that extends to a circular track of radius R as shown in figure. If bob B just manages to complete the circular path of radius R upto a point Q after being hit elastically by bob A, then radius R is ____\_\_\_\_ m.

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  3. 3
    Match List-I with List-II.
    List-I (Relation)List-II (Law)
    (A) ∮E→⋅dl→=−ddt∮B→⋅da→\oint \overrightarrow{E} \cdot \overrightarrow{dl} = - \frac{d}{dt}\oint \overrightarrow{B} \cdot \overrightarrow{da}(I) Ampere's circuital law
    (B) ∮B→⋅dl→=μ0(I+ϵ0dϕEdt)\oint \overrightarrow{B} \cdot \overrightarrow{dl} = \mu_{0}\left( I + \epsilon_{0}\frac{d\phi_{E}}{dt} \right)(II) Faraday's laws of electromagnetic induction
    (C) ∮E→⋅da→=1ϵ0∫ρdv\oint \overrightarrow{E} \cdot \overrightarrow{da} = \frac{1}{\epsilon_{0}}\int\rho dv(III) Ampere-Maxwell law
    (D) ∮B→⋅dl→=μ0I\oint \overrightarrow{B} \cdot \overrightarrow{dl} = \mu_{0}I(IV) Gauss's law of electrostatics
    Choose the correct answer from the options given below :

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  4. 4
    Four persons measure the length of a rod as 20.00 cm,19.75 cm,17.01 cm20.00\text{ }cm,19.75\text{ }cm,17.01\text{ }cm and 18.25 cm . The relative error in the measurement of average length of the rod is :

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  5. 5
    The de Broglie wavelength of an oxygen molecule at 27∘C27^{\circ}C is x×10−12 mx \times 10^{- 12}\text{ }m. The value of x is (take Planck's constant =6.63×10−34 J.s= 6.63 \times 10^{- 34}\text{ }J.s, Boltzmann constant =1.38×10−23 J/K= 1.38 \times 10^{- 23}\text{ }J/K, mass of oxygen molecule =5.31×10−26 kg= 5.31 \times 10^{- 26}\text{ }kg).

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  6. 6
    A simple pendulum of string length 30 cm performs 20 oscillations in 10s. The length of the string required for the pendulum to perform 40 oscillations in the same time duration is ____\_\_\_\_ cm. [Assume that the mass of the pendulum remains same.]

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  7. 7
    Two blocks with masses 100 g and 200 g are attached to the ends of springs A and B as shown in figure. The energy stored in A is E . The energy stored in B , when spring constants kA,kBk_{A},k_{B} of A and BB, respectively satisfy the relation 4kA=3kB4k_{A}= 3k_{B}, is :

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  8. 8
    The moment of inertia of a square loop made of four uniform solid cylinders, each having radius R and length L(R<L)L(R < L) about an axis passing through the mid points of opposite sides, is (Take the mass of the entire loop as M ) :

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  9. 9
    A wire of uniform resistance λΩ/m\lambda\Omega/m is bent into a circle of radius rr and another piece of wire with length 2r2r is connected between points A and B (AOB)(AOB) as shown in figure. The equivalent resistance between points A and B is ____\_\_\_\_ Ω\Omega.

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  10. 10
    The strain-stress plot for materials A,B,CA,B,C and D is shown in the figure. Which material has the largest Young's modulus?

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  11. 11
    Consider light travelling from a medium A to medium B separated by a plane interface. If the light undergoes total internal reflection during its travel from medium A to B and the speed of light in media AA and BB are 2.4×108 m/s2.4 \times10^{8}\text{ }m/s and 2.7×108 m/s2.7 \times10^{8}\text{ }m/s respectively, then the value of critical angle is :

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  12. 12
    The following diagram shows a Zener diode as a voltage regulator. The Zener diode is rated at VZ=5 VV_{Z}= 5\text{ }V and the desired current in load is 5 mA . The unregulated voltage source can supply upto 25 V . Considering the Zener diode can withstand four times of the load current, the value of resistor RSR_{S} (shown in circuit) should be ____\_\_\_\_ Ω\Omega.

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  13. 13
    In hydrogen atom spectrum, ( R→R \rightarrow Rydberg's constant) (A) the maximum wavelength of the radiation of Lyman series is 43R\frac{4}{3R} (B) the Balmer series lies in the visible region of the spectrum (C) the minimum wavelength of the radiation of Paschen series is 9R\frac{9}{R} (D) the minimum wavelength of Lyman series is 54R\frac{5}{4R} Choose the correct answer from the options given below:

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  14. 14
    An object is projected with kinetic energy K from a point A at an angle 60∘60^{\circ} with the horizontal. The ratio of the difference in kinetic energies at points B and C to that at point A (see figure), in the absence of air friction is :

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  15. 15
    Two point charges 2 q and q are placed at vertex A and centre of face CDEF of the cube as shown in figure. The electric flux passing through the cube is :

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  16. 16
    A 20 m long uniform copper wire held horizontally is allowed to fall under the gravity ( g=10 m/s2g = 10\text{ }m/s^{2} ) through a uniform horizontal magnetic field of 0.5 Gauss perpendicular to the length of the wire. The induced EMF across the wire after it travels a vertical distance of 200 m is ____\_\_\_\_ mV .

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  17. 17
    Two small balls with masses m and 2 m are attached to both ends of a rigid rod of length d and negligible mass. If angular momentum of this system is L about an axis (A) passing through its centre of mass and perpendicular to the rod then angular velocity of the system about A is :

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  18. 18
    In a perfectly inelastic collision, two spheres made of the same material with masses 15 kg and 25 kg , moving in opposite directions with speeds of 10 m/s10\text{ }m/s and 30 m/s30\text{ }m/s, respectively, strike each other and stick together. The rise in temperature (in  ∘C\ ^{\circ}C), if all the heat produced during the collision is retained by these spheres, is : (specific heat of sphere material 31cal/kg. ∘C31cal/kg.\ ^{\circ}C and 1cal=4.2 J1cal = 4.2\text{ }J)

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  19. 19
    In a screw gauge, the zero of the circular scale lies 3 divisions above the horizontal pitch line when their metallic studs are brought in contact. Using this instrument thickness of a sheet is measured. If pitch scale reading is 1 mm and the circular scale reading is 51 then the correct thickness of the sheet is ____\_\_\_\_ mm. [Assume least count is 0.01 mm ]

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  20. 20
    Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Consider a ferromagnetic material : Assertion (A) : The individual atoms in a ferromagnetic material possess a magnetic dipole moment and interact with one another in such a way that they spontaneously align themselves forming domains. Reason (R) : At high enough temperature, the domain structure of ferromagnetic material disintegrates. Thus, magnetization will disappear at high enough temperature known as Curie temperature. In the light of the above statements, choose the correct answer from the options given below :

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  21. 21
    A simple pendulum made of mass 10 g and a metallic wire of length 10 cm is suspended vertically in a uniform magnetic field of 2 T. The magnetic field direction is perpendicular to the plane of oscillations of the pendulum. If the pendulum is released from an angle of 60∘60^{\circ} with vertical, then maximum induced EMF between the point of suspension and point of oscillation is ____\_\_\_\_ mV. (Take g=10 m/s2g = 10\text{ }m/s^{2})
  22. 22
    The equation of the electric field of an electromagnetic wave propagating through free space is given by: E=377sin⁡(6.27×103t−2.09×10−5x) N/CE = \sqrt{377}\sin\left( 6.27 \times 10^{3}t - 2.09 \times 10^{- 5}x \right)\ N/C. The average power of the electromagnetic wave is (1α)W/m2\left( \frac{1}{\alpha} \right)W/m^{2}. The value of α\alpha is ____\_\_\_\_ (Take μ0ε0=377\sqrt{\frac{\mu_{0}}{\varepsilon_{0}}} = 377 in SI units)
  23. 23
    Using a variable-frequency a.c. voltage source, the maximum current measured in the given LCR circuit is 50 mA for V=5sin⁡(100t)V = 5\sin(100t). The values of L and R are shown in the figure. The capacitance of the capacitor ( C ) used is ____\_\_\_\_ μF\mu F.
  24. 24
    In two separate Young's double-slit experimental set-ups, two monochromatic light sources of different wavelengths are used to get fringes of equal width. The ratios of the slit separations and that of the wavelengths of light used are 2:12:1 and 1:21:2 respectively. The corresponding ratio of the distances between the slits and the respective screens ( D1/D2D_{1}/D_{2} ) is ____\_\_\_\_.
  25. 25
    The space between the plates of a parallel-plate capacitor of capacitance C (without any dielectric) is now filled with three dielectric slabs of dielectric constants K1=2, K2=3K_{1} = 2,{\text{ }K}_{2} = 3, and K3=5K_{3} = 5 (as shown in the figure). If new capacitance is n3C\frac{n}{3}C then the value of nn is ____\_\_\_\_ .

Chemistry

25 questions

  1. 26
    Which of the following statements regarding the energy of the stationary state is true in the following one-electron system ?

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  2. 27
    Which one of the following graphs accurately represents the plot of partial pressure of CS2CS_{2} vs its mole fraction in a mixture of acetone and CS2CS_{2} at constant temperature?

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  3. 28
    The correct trend in the first ionization enthalpies of the elements in the 3rd 3^{\text{rd~}} period of periodic table is:

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  4. 29
    The correct sequence of reagents for the above conversion of X to Y is :

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  5. 30
    In the given electrochemical cell, Ag(s)∣AgCl(s)∣FeCl2(aq), FeCl3(aq)∣Pt(s)Ag(s)|AgCl(s)|FeCl_{2}(aq),\ FeCl_{3}(aq) \mid Pt(s) at 298 K , the cell potential (Ecell E_{\text{cell~}}) will increase when : (A) Concentration of Fe2+{Fe}^{2 +} is increased. (B) Concentration of Fe3+{Fe}^{3 +} is decreased (C) Concentration of Fe2+{Fe}^{2 +} is decreased (D) Concentration of Fe3+{Fe}^{3 +} is increased (E) Concentration of Cl−{Cl}^{-} is increased. Choose the correct answer from the options given below :

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  6. 31
    ' xx ' is the product which is obtained from propanenitrile and stannous chloride in the presence of hydrochloric acid followed by hydrolysis. ' yy ' is the product which is obtained from the but-2-ene by the ozonolysis followed by hydrolysis. From the following, which product is not obtained when one mole of ' xx ' and one mole of ' y ' react with each other in the presence of alkali followed by heating?

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  7. 32
    Consider the following sequence of reactions. 4-Nitrotoluene Assuming that the reaction proceeds to completion, then 137 mg of 4-nitrotoluene will produce ____\_\_\_\_ mg of B . (Given molar mass in gmol−1H:1,C:12, N:14gmol^{- 1}H:1,C:12,\text{ }N:14, O :16, Br:80Br:80 )

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  8. 33
    A cup of water at 5∘C5^{\circ}C (system) is placed in a microwave oven and the oven is turned on for one minute during which, the water begins to boil. Which of the following option is true?

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  9. 34
    Given below are two statements : Statement I: [CoBr4]2−\left\lbrack {CoBr}_{4} \right\rbrack^{2 -} ion will absorb light of lower energy than [CoCl4]2−\left\lbrack {CoCl}_{4} \right\rbrack^{2 -} ion. Statement II : In [CoI4]2−\left\lbrack {CoI}_{4} \right\rbrack^{2 -} ion, the energy separation between the two set of d-orbitals is more than [CoCl4]2−\left\lbrack {CoCl}_{4} \right\rbrack^{2 -} ion. In the light of the above statements, choose the correct answer from the options given below :

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  10. 35
    But-2-yne and hydrogen (one mole each) are separately treated with (i) Pd/CPd/C and (ii) Na/Na/ liq. NH3NH_{3} to give the products X and Y respectively. Identify the incorrect statements. (A) XX and YY are stereoisomers. (B) Dipole moment of X is zero (C) Boiling point of X is higher than Y . (D) X and Y react with O3/Zn+H2OO_{3}/Zn + H_{2}O to give different products. Choose the correct answer from the options given below :

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  11. 36
    Given, (A) n=5,ml=−1n = 5,m_{l}= - 1 (B) n=3,l=2,ml=−1,ms=+12n = 3,l = 2,m_{l}= - 1,m_{s}= +\frac{1}{2} The maximum number of electron(s) in an atom that can have the quantum numbers as given in (A) and (B) respectively are :

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  12. 37
    Consider the following compounds Arrange these compounds in the increasing order of reactivity with nitrating mixture.

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  13. 38
    The statements that are incorrect about the nickel (II) complex of dimethylglyoxime are : (A) It is red in colour (B) It has a high solubility in water at pH=9pH = 9 (C) The Ni ion has two unpaired d-electrons (D) The N−Ni−NN - Ni - N bond angle is almost close to 90∘90^{\circ} (E) The complex contains four five-membered metallacycles (metal containing rings) Choose the correct answer from the options given below:

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  14. 39
    From the given following (A to D) cyclic structures, those which will not react with Tollen's reagent are : (A) (B) (C) (D)

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  15. 40
    Identify the molecule (X)(X) with maximum number of lone pairs of electrons (obtained using Lewis dot structure) among HNO3,H2SO4,NF3HNO_{3},H_{2}SO_{4},NF_{3} and O3O_{3}. Choose the correct bond angle made by the central atom of the molecule (X).

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  16. 41
    Match List-I with List-II.
    List-I Functional group (detection)List-II Change observed during detection
    (A)Unsaturation (Baeyer's test)(I)Red colour Appears
    (B)Alcoholic group (Ceric ammonium nitrate test)(II)Silver mirror appears
    (C)Aldehyde group (Tollen's reagent)(III)Violet colour appears
    (D)Phenolic group ( FeCl3{FeCl}_{3} test)(IV)Discharge of pink colour
    Choose the correct answer from the options given below:

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  17. 42
    Given below are two statements : Statement-I : Sublimation is used for the separation and purification of compounds with low melting point. Statement-II : The boiling point of a liquid increases as the external pressure is reduced. In the light of the above statements, choose the correct answer from the options given below :

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  18. 43
    Compound ' P ' undergoes the following sequence of reactions :  ′P\ ^{'}P ' is :

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  19. 44
    The correct statements from the following are : (A) Ionic radii of trivalent cations of group 13 elements decreases down the group. (B) Electronegativity of group 13 elements decreases down the group. (C) Among the group 13 elements, Boron has highest first ionisation enthalpy. (D) The trichloride and triiodide of group 13 elements are covalent in nature. Choose the correct answer from the options given below :

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  20. 45
    Consider the general reaction given below at 400 K
    xA(g)⇌yB(g)xA(g) \rightleftharpoons yB(g)
    The values of KpK_{p} and KcK_{c} are studied under the same condition of temperature but variation in x and y . (I) Kp=85.87K_{p}= 85.87 and Kc=2.586K_{c}= 2.586 appropriate units (II) Kp=0.862K_{p}= 0.862 and Kc=28.62K_{c}= 28.62 appropriate units The value of xx and yy in (I) and (II) respectively are:

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  21. 46
    For the thermal decomposition of reaction AB(g)AB(g), the following is constructed. The half life of the reaction is ' x ' min. x=x = ____\_\_\_\_ min. (Nearest integer)
  22. 47
    For the following gas phase equilibrium reaction at constant temperature,
    NH3(g)⇌12 N2(g)+32H2(g){NH}_{3}(g) \rightleftharpoons \frac{1}{2}{\text{ }N}_{2}(g) + \frac{3}{2}H_{2}(g)
    If the total pressure is 3 atm\sqrt{3}\text{ }atm and the pressure equilibrium constant (Kp)\left( K_{p} \right) is 9 atm , then the degree of dissociation is given as (x×10−2)−1/2\left( x \times 10^{- 2} \right)^{- 1/2}. The value of xx is ____\_\_\_\_ (Nearest integer)
  23. 48
    x mg of pure HCl was used to make an aqueous solution. 25.0 mL of 0.1MBa(OH)20.1MBa(OH)_{2} solution is used when the HCl solution was titrated against it. The numerical value of xx is ____\_\_\_\_ ×10−1\times 10^{- 1}. (Nearest integer) Given : Molar mass of HCl and Ba(OH)2Ba(OH)_{2} are 36.5 and 171.0 g mol−1171.0\text{ }g{\text{ }mol}^{- 1} respectively.
  24. 49
    Consider all the structural isomers with molecular formula C5H11BrC_{5}H_{11}Br are separately treated with KOH (aq) to give respective substitution products, without any rearrangement. The number of products which can exhibit optical isomerism from these is ____\_\_\_\_ .
  25. 50
    The crystal field splitting energy of [Co( oxalate )3]3−\left\lbrack Co(\text{~oxalate~})_{3} \right\rbrack^{3 -} complex is ' n ' times that of the [Cr(oxalate)3]3−\left\lbrack Cr(\text{oxalate})_{3} \right\rbrack^{3 -} complex. Here ' n ' is ____\_\_\_\_ . [Assume Δ0≫P\Delta_{0} \gg P ]

Mathematics

25 questions

  1. 51
    Let the domain of the function f(x)=log⁡3log⁡5log⁡7(9x−x2−13)f(x) =\log_{3}\log_{5}\log_{7}\left( 9x -x^{2}- 13 \right) be the interval (m,n)(m,n). Let the hyperbola x2a2−y2b2=1\frac{x^{2}}{a^{2}}-\frac{y^{2}}{b^{2}}= 1 have eccentricity n3\frac{n}{3} and the length of the latus rectum 8m3\frac{8m}{3}. Then b2−a2b^{2}-a^{2} is equal to :

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  2. 52
    Let f(x)=∫ (2−x2)⋅ex(1+x)(1−x)3/2dxf(x) =\int_{}^{}\ \frac{\left( 2 -x^{2} \right)\cdot e^{x}}{(\sqrt{1 + x})(1 - x)^{3/2}}dx. If f(0)=0f(0) = 0, then f(12)f\left( \frac{1}{2} \right) is equal to :

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  3. 53
    Let a→=−i^+j^+2k^,b→=i^−j^−3k^,c→=a→×b→\overrightarrow{a}= -\widehat{i}+\widehat{j}+ 2\widehat{k},\overrightarrow{b}=\widehat{i}-\widehat{j}- 3\widehat{k},\overrightarrow{c}=\overrightarrow{a}\times\overrightarrow{b} and d→=c→×a→\overrightarrow{d}=\overrightarrow{c}\times\overrightarrow{a}. Then (a→−b→)⋅d→(\overrightarrow{a}-\overrightarrow{b}) \cdot\overrightarrow{d} is equal to :

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  4. 54
    A rectangle is formed by the lines x=0,y=0x = 0,y = 0, x=3x = 3 and y=4y = 4. Let the line L be perpendicular to 3x+y+6=03x + y + 6 = 0 and divide the area of the rectangle into two equal parts. Then the distance of the point (12,−5)\left( \frac{1}{2}, - 5 \right) from the line L is equal to :

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  5. 55
    Let the line y−x=1y - x = 1 intersect the ellipse x22+y21=1\frac{x^{2}}{2}+\frac{y^{2}}{1}= 1 at the points A and B . Then the angle made by the line segment AB at the center of the ellipse is :

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  6. 56
    Let A={−2,−1,0,1,2,3,4}\mathbf{A = \{ - 2, - 1,0,1,2,3,4\}}. Let R be a relation on A defined by xRy if and only if 2x+y≤22x + y \leq 2. Let ll be the number of elements in R. Let m and n be the minimum number of elements required to be added in R to make it reflexive and symmetric relations respectively. Then l+m+nl + m + n is equal to :

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  7. 57
    Let y=y(x)y = y(x) be the solution of the differential equation x4dy+(4x3y+2sin⁡x)dx=0,x>0,y(π2)=0x^{4}dy +\left( 4x^{3}y + 2\sin x \right)dx = 0,x > 0,y\left( \frac{\pi}{2} \right)= 0. Then π4y(π3)\pi^{4}y\left( \frac{\pi}{3} \right) is equal to :

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  8. 58
    If α\alpha and β(α<β)\beta(\alpha < \beta) are the roots of the equation (−2+3)(∣x−3∣)+(x−6x)+(9−23)=0( - 2 +\sqrt{3})(|\sqrt{x}- 3|) + (x - 6\sqrt{x}) + (9 - 2\sqrt{3}) = 0, x≥0x \geq 0, then βα+αβ\sqrt{\frac{\beta}{\alpha}}+\sqrt{\alpha\beta} is equal to :

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  9. 59
    Let f(x)={ax2+2ax+34x2+4x−3,x≠−32,12bx=−32,12f(x) =\left\{ \begin{matrix} \frac{ax^{2}+ 2ax + 3}{4x^{2}+ 4x - 3}, & x \neq -\frac{3}{2},\frac{1}{2} \\ b & x = -\frac{3}{2},\frac{1}{2} \end{matrix} \right. be continuous at x=−32x = -\frac{3}{2}. If fof(x)=75fof(x) =\frac{7}{5}, then xx is equal to :

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  10. 60
    The value of the integral ∫π245π24dx1+tan⁡2x3\int_{\frac{\pi}{24}}^{\frac{5\pi}{24}} \frac{dx}{1 +\sqrt[3]{\tan2x}} is :

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  11. 61
    Among the statements : Statements (I) : If ∣1cos⁡αcos⁡βcos⁡α1cos⁡γcos⁡βcos⁡γ1∣=∣0cos⁡αcos⁡βcos⁡α0cos⁡γcos⁡βcos⁡γ0∣\left| \begin{matrix} 1 & \cos\alpha & \cos\beta \\ \cos\alpha & 1 & \cos\gamma \\ \cos\beta & \cos\gamma & 1 \end{matrix} \right| = \left| \begin{matrix} 0 & \cos\alpha & \cos\beta \\ \cos\alpha & 0 & \cos\gamma \\ \cos\beta & \cos\gamma & 0 \end{matrix} \right| , then cos⁡2α+cos⁡2β+cos⁡2γ=32\cos^{2}\alpha + \cos^{2}\beta + \cos^{2}\gamma = \frac{3}{2}, and Statements (II) : If ∣x2+xx+1x−22x2+3x−13x3x−3x2+2x+32x−12x−1∣\left| \begin{matrix} x^{2} + x & x + 1 & x - 2 \\ 2x^{2} + 3x - 1 & 3x & 3x - 3 \\ x^{2} + 2x + 3 & 2x - 1 & 2x - 1 \end{matrix} \right| =px+q= px + q, then p2=196q2p^{2} = 196q^{2},

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  12. 62
    The value of  100C5051+ 100C5152+….+ 100C100101\frac{\ ^{100}C_{50}}{51}+\frac{\ ^{100}C_{51}}{52}+ \ldots. +\frac{\ ^{100}C_{100}}{101} is :

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  13. 63
    Let the mean and variance of 8 numbers −10,−7,−1,x,y,9,2,16- 10, - 7, - 1,x,y,9,2,16 be 72\frac{7}{2} and 2934\frac{293}{4}, respectively. Then the mean of 4 numbers x,y,x+y+1,∣x−y∣x,y,x + y + 1,|x - y| is:

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  14. 64
    The sum of all possible values of n∈Nn \in N, so that the coefficients of x,x2x,x^{2} and x3x^{3} in the expansion of (1+x2)2(1+x)n\left( 1 +x^{2} \right)^{2}(1 + x)^{n}, are in arithmetic progression is :

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  15. 65
    The vertices B and C of a triangle ABC lie on the line x1=1−y−2=z−23\frac{x}{1}=\frac{1 - y}{- 2}=\frac{z - 2}{3}. The coordinates of A and B are ( 1,6,31,6,3 ) and ( 4,9,α4,9,\alpha ) respectively and C is at a distance of 10 units from B . The area (in sq. units) of △ABC\bigtriangleup ABC is:

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  16. 66
    Number of solutions of 3cos⁡2θ+8cos⁡θ+33=0,θ∈[−3π,2π]\sqrt{3}\cos2\theta + 8\cos\theta + 3\sqrt{3}= 0,\theta \in \lbrack - 3\pi,2\pi\rbrack is:

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  17. 67
    Let S={z:3≤∣2z−3(1+i)∣≤7}\mathbf{S = \{ z:3 \leq |2z - 3(1 + i)| \leq 7\}} be a set of complex numbers. Then Minz∈s∣(z+12(5+3i))∣\underset{z \in s}{Min}\left| \left( z +\frac{1}{2}(5 + 3i) \right) \right| is equal to :

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  18. 68
    Let α\alpha and β\beta respectively be the maximum and the minimum values of the function f(θ)=4(sin⁡4(7π2−θ)+sin⁡4(11π+θ))f(\theta) = 4\left( \sin^{4}\left( \frac{7\pi}{2}- \theta \right)+\sin^{4}(11\pi + \theta) \right) −2(sin⁡6(3π2−θ)+sin⁡6(9π−θ)),θ∈R.- 2\left( \sin^{6}\left( \frac{3\pi}{2}- \theta \right)+\sin^{6}(9\pi - \theta) \right),\theta \in R. Then α+2β\alpha + 2\beta is equal to :

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  19. 69
    A building construction work can be completed by two masons A and B together in 22.5 days. Mason A alone can complete the construction work in 24 days less than mason B alone. Then mason A alone will complete the construction work in:

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  20. 70
    Let the direction cosines of two lines satisfy the equations: 4l+m−n=04\mathcal{l +}m - n = 0 and 2mn+10nl+3lm=02mn + 10n\mathcal{l +}3\mathcal{l}m = 0. Then the cosine of the acute angle between these lines is :

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  21. 71
    Let ∣A∣=6|A| = 6, where A is a 3×33 \times 3 matrix. If ∣adj(3adj( A2.adj(2 A)))∣=2m.3n,m,n∈N\left| adj\left( 3adj\left( {\text{ }A}^{2}.adj(2\text{ }A) \right) \right) \right| = 2^{m}{.3}^{n},m,n \in N, then m+nm + n is equal to ____\_\_\_\_ .
  22. 72
    Let the area of the region bounded by the curve y=max⁡{sin⁡x,cos⁡x}y = \max\{ \sin x,\cos x\}, the lines x=0,x=3π2x = 0,x = \frac{3\pi}{2} and the xx-axis be A. Then, A+A2A + A^{2} is equal to
  23. 73
    Let f be a twice differentiable non-negative function such that (f(x))2=25+∫0x((f(t))2+(f′(t))2)dt(f(x))^{2} = 25 + \int_{0}^{x} \left( (f(t))^{2} + \left( f'(t) \right)^{2} \right)dt. Then the mean of f(log⁡e(1)),f(log⁡e(2)),…..,f(log⁡e(625))f\left( \log_{e}(1) \right),f\left( \log_{e}(2) \right),\ldots..,f\left( \log_{e}(625) \right) is equal to ____\_\_\_\_.
  24. 74
    From the first 100 natural numbers, two numbers first a and then b are selected randomly without replacement. If the probability that a−b≥10a - b \geq 10 is mn,gcd(m,n)=1\frac{m}{n},gcd(m,n) = 1, then m+nm + n is equal to ____\_\_\_\_ .
  25. 75
    The number of 4-letter words, with or without meaning, which can be formed using the letters PQRPQRSTUVP, is ____\_\_\_\_.

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