JEE Main 2026 (Online) 28th January Evening Shift
JEE 2026 Previous Year
3 hDuration
300Total Marks
75Questions
3Sections
Instructions
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Paper Structure
Chemistry
Chemistry
Q1.
mcq single
+4 / 1
A student performed analysis of aliphatic organic compound ‘X’ which on analysis gave C = 61.01%, H = 15.25%, N = 23.74%.
This compound, on treatment with HNO~2~/H~2~O produced another compound ‘Y’ which did not contain any nitrogen atom. However, the compound ‘Y’ upon controlled oxidation produced another compound ‘Z’ that responded to iodoform test.
**The structure of ‘X’ is :**
Q2.
mcq single
+4 / 1
Total number of alkali insoluble solid sulphonamides obtained by reaction of given amines with Hinsberg's reagent is ________.
Aniline, N-Methylaniline, Methanamine, N,N-Dimethylmethanamine, N-Methyl methanamine, Phenylmethanamine, N-propylaniline, N-phenylaniline, N,N-Dimethylaniline, Allyl amine, Isopropyl amine
Q3.
mcq single
+4 / 1
Consider the following statements about manganate and permanganate ions. Identify the **correct** statements.
A. The geometry of both manganate and permanganate ions is tetrahedral.
B. The oxidation states of Mn in manganate and permanganate are +7 and +6, respectively.
C. Oxidation of Mn(II) salt by peroxodisulphate gives manganate ion as the final product.
D. Manganate ion is paramagnetic and permanganate ion is diamagnetic.
E. Acidified permanganate ion reduces oxalate, nitrite and iodide ions.
Choose the **correct** answer from the options given below :
Q4.
numerical
+4 / 1
A → B (first reaction)
C → D (second reaction)
Consider the above two first-order reactions. The rate constant for first reaction at 500 K is double of the same at 300 K. At 500 K, 50% of the reaction becomes complete in 2 hour. The activation energy of the second reaction is half of that of first reaction. If the rate constant at 500 K of the second reaction becomes double of the rate constant of first reaction at the same temperature; then rate constant for the second reaction at 300 K is _______ × 10^(-1) hour^(-1) (nearest integer).
Q5.
mcq single
+4 / 1
Match List - I with List - II according to shape.
List – I
List – II
A. XeO~3~**
B. XeF~2~
C. XeO~2~F~2~
D. XeOF~4~
I. BrF~5~
II. NH~3~
III. [I~3~]^(−)
IV. SF~4~
Choose the correct** answer from the options given below :
Q6.
mcq single
+4 / 1
Consider the following aqueous solutions.
I. 2.2 g Glucose in 125 mL of solution.
II. 1.9 g Calcium chloride in 250 mL of solution.
III. 9.0 g Urea in 500 mL of solution.
IV. 20.5 g Aluminium sulphate in 750 mL of solution.
The **correct** increasing order of boiling point of these solutions will be :
[Given : Molar mass in g mol^(−1) : H = 1, C = 12, N = 14, O = 16, Cl = 35.5, Ca = 40, Al = 27 and S = 32]
Q7.
mcq single
+4 / 1
For the given reaction;
CaCO~3~ + 2HCl → CaCl~2~ + H~2~O + CO~2~
If 90 g CaCO~3~ is added to 300 mL of HCl which contains 38.55% HCl by mass and has density 1.13 g mL^(−1), then which of the following option is **correct**?
Given molar mass of H, Cl, Ca and O are 1, 35.5, 40 and 16 g mol^(−1) respectively.
Q8.
mcq single
+4 / 1
Observe the following equilibrium in a 1 L flask.
**A(g) ⇌ B(g)**
At T(K), the equilibrium concentrations of A and B are 0.5 M and 0.375 M respectively. 0.1 moles of A is added into the flask and heated to T(K) to establish the equilibrium again. The new equilibrium concentrations (in M) of A and B are respectively
Q9.
mcq single
+4 / 1
Consider the elements N, P, O, S, Cl and F. The number of valence electrons present in the elements with most and least metallic character from the above list is respectively.
Q10.
mcq single
+4 / 1
The plot of $\log_{10} K$ vs $\frac{1}{T}$ gives a straight line. The intercept and slope respectively are (where K is equilibrium constant).
Q11.
mcq single
+4 / 1
Given below are two statements :
**Statement I :** The increasing order of boiling point of hydrogen halides is HCl < HBr < HI < HF.
**Statement II :** The increasing order of melting point of hydrogen halides is HCl < HBr < HF < HI.
In the light of the above statements, choose the **correct** answer from the options given below :
Q12.
mcq single
+4 / 1
Consider the following reactions
$\mathrm{Na_2B_4O_7} \xrightarrow{\Delta} 2X + Y$
$\mathrm{CuSO_4} + Y \xrightarrow{\text{Non-Luminous flame}} Z + SO_3$
$2Z + 2X + \text{Carbon} \xrightarrow{\text{Luminous flame}} 2Q + \mathrm{Na_2B_4O_7} + CO$
The oxidation states of Cu in Z and Q, respectively are :
Q13.
numerical
+4 / 1
The number of isoelectronic species among $Sc^{3+}, Cr^{2+}, Mn^{3+}, Co^{3+}$ and $Fe^{3+}$ is ‘n’. If ‘n’ moles of AgCl is formed during the reaction of complex with formula $CoCl_3(en)_2NH_3$ with excess of $AgNO_3$ solution, then the number of electrons present in the $t_{2g}$ orbital of the complex is ________.
Q14.
mcq single
+4 / 1
The correct increasing order of spin-only magnetic moment values of the complex ions
[MnBr~4~]^(2−) (A), [Cu(H~2~O)~6~]^(2+) (B), [Ni(CN)~4~]^(2−) (C) and [Ni(H~2~O)~6~]^(2+) (D) is :
Q15.
mcq single
+4 / 1
Which of the following reaction is NOT correctly represented?
Q16.
mcq single
+4 / 1
The correct order of acidic strength of the major products formed in the given reactions, is :
**A.** $\mathrm{PhNH}_2 \xrightarrow[\substack{\text { (2) } \mathrm{CuCN}^2 \\ \text { (3) } \mathrm{H}_3 \mathrm{O}^{+} / \Delta}]{\text { (1) } \mathrm{NaNO}_2+\mathrm{HCl}\left(<5^{\circ} \mathrm{C}\right)}[\mathrm{A}]$
**B.** $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CHO} \xrightarrow[ \Delta]{\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right]^{+}, \mathrm{OH}^{-}}[\mathrm{B}]$
**C.** $\mathrm{CH}_4+\mathrm{O}_2 \xrightarrow[\text { (ii) } \mathrm{Na}_2 \mathrm{Cr}_2 \mathrm{O}_7 / \mathrm{H}^{+}]{\text {(i) } \mathrm{Mo}_2 \mathrm{O}_3}[\mathrm{C}]$
**D.** $\mathrm{PhCH}_2 \mathrm{MgBr}+\mathrm{CO}_2 \xrightarrow[\mathrm{H}_3 \mathrm{O}^{+}]{\text {Dry ether }}[\mathrm{D}]$
Choose the **correct** answer from the options given below :
Q17.
mcq single
+4 / 1
A student has been given 0.314 g of an organic compound and asked to estimate Sulphur. During the experiment, the student has obtained 0.4813 g of barium sulphate. The percentage of sulphur present in the compound is _________. (Given Molar mass in g mol^(−1) S: 32, BaSO~4~: 233)
Q18.
mcq single
+4 / 1
Structures of four disaccharides are given below. Among the given disaccharides, the non-reducing sugar is :
Q19.
mcq single
+4 / 1
The cyclic cations having the same number of hyperconjugation are :
Choose the **correct** answer from the options given below :
Choose the **correct** answer from the options given below :
Q20.
mcq single
+4 / 1
**Identify the correct statements :**
The presence of –NO~2~ group in benzene ring
A. activates the ring towards electrophilic substitutions.
B. deactivates the ring towards electrophilic substitutions.
C. activates the ring towards nucleophilic substitutions.
D. deactivates the ring towards nucleophilic substitutions.
Choose the correct answer from the options given below :
Q21.
numerical
+4 / 1
A volume of x mL of 5 M NaHCO~3~ solution was mixed with 10 mL of 2 M H~2~CO~3~ solution to make an electrolytic buffer. If the same buffer was used in the following electrochemical cell to record a cell potential of 235.3 mV, then the value of **x** = ______ mL (nearest integer).
Sn(s) | Sn(OH)~6~^(2−) (0.5 M) | HSnO~2~^(−) (0.05 M) | OH^(−) | Bi~2~O~3~(s) | Bi(s)
**Consider up to one place of decimal for intermediate calculations**
$\left[\begin{array}{ll}\text { Given: } & E_{Sn\left( {OH} \right)_6^{2 - } |HSnO_2^ -}^o = - 0.9V \\ & \mathrm{E}^{\mathrm{o}}{ }_{\mathrm{Bi}_2 \mathrm{O}_3 \mid \mathrm{Bi}}=-0.44 \mathrm{~V} \\ & \mathrm{pKa}_{\left(\mathrm{H}_2 \mathrm{CO}_3\right)}=6.11 \\ & \frac{2.303 \mathrm{RT}}{\mathrm{F}}=0.059 \mathrm{~V} \\ & \text { Antilog }(1.29)=19.5\end{array}\right]$
Q22.
numerical
+4 / 1
For strong electrolyte $\Lambda_m$ increases slowly with dilution and can be represented by the equation
$$\Lambda_m = \Lambda_m^\circ - A c^{1/2}$$
Molar conductivity values of the solutions of strong electrolyte AB at 18°C are given below :c [mol L^(-1)]0.040.090.160.25$\Lambda_m$ [S cm^(2) mol^(-1)]96.195.795.394.9The value of constant A based on the above data [in S cm^(2) mol^(-1)/(mol/L)^(1/2)] unit is ________.
Q23.
mcq single
+4 / 1
The reactions which produce alcohol as the product are :
A. $\mathrm{CH}_4 + \mathrm{O}_2 \xrightarrow{\mathrm{Mo}_2\mathrm{O}_3,\ \Delta} $
B. $2\mathrm{CH}_3\mathrm{CH}_3 + 3\mathrm{O}_2 \xrightarrow{(\mathrm{CH}_3\mathrm{COO})_2\mathrm{Mn},\ \Delta} $
C. $(\mathrm{CH}_3)_3\mathrm{CH} \xrightarrow{\mathrm{KMnO}_4} $
D. $ 2\mathrm{CH}_4 + \mathrm{O}_2 \xrightarrow{\mathrm{Cu}/523\ \mathrm{K}/100 \ \mathrm{atm}.} $
E. $\mathrm{CH}_3-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_3 \xrightarrow{\mathrm{KMnO}_4/\mathrm{H}^+} $
Choose the **correct** answer from the options given below :
Q24.
mcq single
+4 / 1
The wavelength of photon 'A' is 400 nm. The frequency of photon 'B' is $10^{16} \ \text{s}^{-1}$. The wave number of photon 'C' is $10^4 \ \text{cm}^{-1}$. The correct order of energy of these photons is :
Q25.
numerical
+4 / 1
Two positively charged particles $m_1$ and $m_2$ have been accelerated across the same potential difference of 200 keV as shown below.
[Given mass of $m_1 = 1$ amu and $m_2 = 4$ amu]
The deBroglie wavelength of $m_1$ will be $x$ times of $m_2$. The value of $x$ is __________ (nearest integer)
[Given mass of $m_1 = 1$ amu and $m_2 = 4$ amu]
The deBroglie wavelength of $m_1$ will be $x$ times of $m_2$. The value of $x$ is __________ (nearest integer)Mathematics
Mathematics
Q1.
mcq single
+4 / 1
Let P be a point in the plane of the vectors $\overrightarrow{AB}=3\hat{i} + \hat{j} - \hat{k}$ and $\overrightarrow{AC}=\hat{i} - \hat{j} + 3\hat{k}$ such that P is equidistant from the lines AB and AC. If $|\overrightarrow{AP}| = \frac{\sqrt{5}}{2}$, then the area of the triangle ABP is :
Q2.
numerical
+4 / 1
If the distance of the point $P(43, \alpha, \beta)$, $\beta < 0$, from the line $\vec{r} = 4\hat{i} - \hat{k} + \mu (2\hat{i} + 3\hat{k}), \mu \in \mathbb{R}$ along a line with direction ratios $3, -1, 0$ is $13\sqrt{10}$, then $\alpha^2 + \beta^2$ is equal to ________
Q3.
mcq single
+4 / 1
The probability distribution of a random variable X is given below :X4k$\frac{30}{7}k$$\frac{32}{7}k$$\frac{34}{7}k$$\frac{36}{7}k$$\frac{38}{7}k$$\frac{40}{7}k$6kP(X)$\frac{2}{15}$$\frac{1}{15}$$\frac{2}{15}$$\frac{1}{5}$$\frac{1}{15}$$\frac{2}{15}$$\frac{1}{5}$$\frac{1}{15}$If E(X) = $\frac{263}{15}$, then P(X < 20) is equal to :
Q4.
mcq single
+4 / 1
Let Q(a, b, c) be the image of the point P(3, 2, 1) in the line $\frac{x-1}{1} = \frac{y}{2} = \frac{z-1}{1}$. Then the distance of Q from the line $\frac{x-9}{3} = \frac{y-9}{2} = \frac{z-5}{-2}$ is
Q5.
mcq single
+4 / 1
$ \frac{6}{3^{26}} + \frac{10 \cdot 1}{3^{25}} + \frac{10 \cdot 2}{3^{24}} + \frac{10 \cdot 2^2}{3^{23}} + \ldots + \frac{10 \cdot 2^{24}}{3} $ is equal to :
Q6.
numerical
+4 / 1
If $\sum\limits_{r=1}^{25} \left( \frac{r}{r^4 + r^2 + 1} \right) = \frac{p}{q}$, where p and q are positive integers such that $\gcd(p, q) = 1$, then p + q is equal to ________.
Q7.
mcq single
+4 / 1
Let the arithmetic mean of $\frac{1}{a}$ and $\frac{1}{b}$ be $\frac{5}{16}$, $a > 2$. If $\alpha$ is such that $a$, $4$, $\alpha$, $b$ are in A.P., then the equation $\alpha x^2 - a x + 2(\alpha - 2b) = 0$ has :
Q8.
mcq single
+4 / 1
Let $f(x) = \lim\limits_{\theta \to 0} \left( \frac{\cos \pi x - x^\left( \frac{2}{\theta} \right) \sin(x-1)}{1 + x^\left( \frac{2}{\theta} \right) (x-1)} \right),\ x \in \mathbb{R}$. Consider the following two statements :
(I) $f(x)$ is discontinuous at $x=1$.
(II) $f(x)$ is continuous at $x = -1$.
Then,
Q9.
mcq single
+4 / 1
Let $P_1 : y = 4x^2$ and $P_2 : y = x^2 + 27$ be two parabolas. If the area of the bounded region enclosed between $P_1$ and $P_2$ is six times the area of the bounded region enclosed between the line $y = \alpha x$, $\alpha > 0$ and $P_1$, then $\alpha$ is equal to :
Q10.
numerical
+4 / 1
Let $A = \begin{bmatrix} 3 & -4 \\ 1 & -1 \end{bmatrix}$ and $B$ be two matrices such that $A^{100} = 100B + I$. Then the sum of all the elements of $B^{100}$ is _______
Q11.
mcq single
+4 / 1
Let $$ f(x)=\int \frac{d x}{x^{2 / 3}+2 x^{1 / 2}}, $$ be such that $f(0) = -26 + 24 \log_e(2)$. If $f(1) = a + b \log_e(3)$, where $a, b \in \mathbb{Z}$, then $a + b$ is equal to :
Q12.
mcq single
+4 / 1
Let A be the focus of the parabola $y^2 = 8x$. Let the line $y = mx + c$ intersect the parabola at two distinct points B and C. If the centroid of the triangle ABC is $\left( \frac{7}{3}, \frac{4}{3} \right)$, then $(BC)^2$ is equal to :
Q13.
mcq single
+4 / 1
Considering the principal values of inverse trigonometric functions, the value of the expression
$$\tan \left( 2 \sin^{-1}\left( \frac{2}{\sqrt{13}} \right) - 2 \cos^{-1}\left( \frac{3}{\sqrt{10}} \right) \right)$$is equal to :
Q14.
mcq single
+4 / 1
Given below are two statements :
**Statement I** :
$25^{13} + 20^{13} + 8^{13} + 3^{13}$ is divisible by 7.
**Statement II** :
The integral part of $(7 + 4\sqrt{3})^{25}$ is an odd number.
In the light of the above statements, choose the **correct answer** from the options given below :
Q15.
mcq single
+4 / 1
The sum of the coefficients of $x^{499}$ and $x^{500}$ in $(1 + x)^{1000} + x(1 + x)^{999} + x^2(1 + x)^{998} + \ldots + x^{1000}$ is :
Q16.
mcq single
+4 / 1
Let
$A = \{ z \in \mathbb{C} : |z - 2| \leq 4 \}$ and
$B = \{ z \in \mathbb{C} : |z - 2| + |z + 2| = 5 \}$.
Then the max $\{|z_1 - z_2| : z_1 \in A \text{ and } z_2 \in B \}$ is :
Q17.
mcq single
+4 / 1
Let the ellipse $E: \frac{x^2}{144} + \frac{y^2}{169} = 1$ and the hyperbola $H: \frac{x^2}{16} - \frac{y^2}{\lambda^2} = -1$ have the same foci. If $e$ and $L$
respectively denote the eccentricity and the length of the latus rectum of $H$, then the value of $24(e+L)$ is :
Q18.
mcq single
+4 / 1
The sum of all the elements in the range of $f(x) = \text{Sgn}(\sin x) + \text{Sgn}(\cos x) + \text{Sgn}(\tan x) + \text{Sgn}(\cot x)$, $x \neq \frac{n\pi}{2}, n \in \mathbb{Z}$, where
$\text{Sgn}(t) = \begin{cases} 1, & \text{if } t > 0 \\ -1, & \text{if } t < 0 \end{cases}$
is :
Q19.
mcq single
+4 / 1
Given below are two statements :
**Statement I :** The function $f: \mathbb{R} \to \mathbb{R}$ defined by $f(x) = \frac{x}{1 + |x|}$ is one-one.
**Statement II :** The function $f: \mathbb{R} \to \mathbb{R}$ defined by $f(x) = \frac{x^2 + 4x - 30}{x^2 - 8x + 18}$ is many-one.
In the light of the above statements, choose the **correct answer** from the options given below :
Q20.
mcq single
+4 / 1
Let $y = y(x)$ be the solution of the differential equation $x \frac{dy}{dx} - y = x^2 \cot x$, $x \in (0, \pi)$. If $y\left(\frac{\pi}{2}\right) = \frac{\pi}{2}$, then
$6y\left(\frac{\pi}{6}\right) - 8y\left(\frac{\pi}{4}\right)$ is equal to :
Q21.
mcq single
+4 / 1
Let the circle $x^2 + y^2 = 4$ intersect x-axis at the points A$(a, 0)$, $a > 0$ and B$(b, 0)$. Let $P(2 \cos \alpha, 2 \sin \alpha)$, $0 < \alpha < \frac{\pi}{2}$ and $Q(2 \cos \beta, 2 \sin \beta)$ be two points such that $(\alpha - \beta) = \frac{\pi}{2}$. Then the point of intersection of AQ and BP lies on :
Q22.
mcq single
+4 / 1
An ellipse has its center at $(1, -2)$, one focus at $(3, -2)$ and one vertex at $(5, -2)$. Then the length of its latus rectum is :
Q23.
numerical
+4 / 1
Three persons enter in a lift at the ground floor. The lift will go up to 10^(th) floor. The number of ways, in which the three persons can exit the lift at three different floors, if the lift does not stop at first, second and third floors, is equal to ________.
Q24.
numerical
+4 / 1
Let $f$ be a differentiable function satisfying $f(x) = 1 - 2x + \int\limits_0^x e^{(x-t)} f(t)\,dt$, $x \in \mathbb{R}$ and let
$g(x) = \int\limits_0^x (f(t) + 2)^{15} (t - 4)^6 (t + 12)^{17}\,dt$, $x \in \mathbb{R}$.
If $p$ and $q$ are respectively the points of local minima and local maxima of $g$, then the value of $|p+q|$ is equal to ________.
Q25.
mcq single
+4 / 1
Let [.] denote the greatest integer function. Then
$$ \int\limits_{-\frac{\pi}{2}}^{\frac{\pi}{2}} \left( \frac{12(3+[x])}{3+\left[\sin x\right]+\left[\cos x\right]} \right) dx $$
is equal to :
Physics
Physics
Q1.
mcq single
+4 / 1
Two p-n junction diodes $D_1$ and $D_2$ are connected as shown in figure. $A$ and $B$ are input signals and $C$ is the output. The given circuit will function as a ________.
Q2.
numerical
+4 / 1
A beam of light consisting of wavelengths 650 nm and 550 nm illuminates the Young's double slits with separation of 2 mm such that the interference fringes are formed on a screen, placed at a distance of 1.2 m from the slits. The least distance of a point from the central maximum, where the bright fringes due to both the wavelengths coincide, is ________ $\times 10^{-5}$ m.
Q3.
mcq single
+4 / 1
As shown in the figure, a spring is kept in a stretched position with some extension by holding the masses $1 \text{ kg}$ and $0.2 \text{ kg}$ with a separation more than spring natural length and are released. Assuming the horizontal surface to be frictionless, the angular frequency (in SI unit) of the system is :
Q4.
numerical
+4 / 1
A fly wheel having mass 3 kg and radius 5 m is free to rotate about a horizontal axis. A string having negligible mass is wound around the wheel and the loose end of the string is connected to 3 kg mass. The mass is kept at rest initially and released. Kinetic energy of the wheel when the mass descends by 3 m is ________ J. ($g = 10~\mathrm{m/s^2}$)
Q5.
mcq single
+4 / 1
When the position vector $\vec{r} = x\hat{i} + y\hat{j} + z\hat{k}$ changes sign as $-\vec{r}$, which one of the following vector will not flip under sign change?
Q6.
mcq single
+4 / 1
The mean free path of a molecule of diameter $5 \times 10^{-10}$ m at the temperature $41^{\circ}$C and pressure $1.38 \times 10^5$ Pa, is given as ________ m. (Given $k_B = 1.38 \times 10^{-23}$ J/K).
Q7.
numerical
+4 / 1
A thermodynamic system is taken through the cyclic process *ABC* as shown in the figure. The total work done by the system during the cycle *ABC* is ______ J.
Q8.
mcq single
+4 / 1
Number of photons of equal energy emitted per second by a 6 mW laser source operating at 663 nm is ________.
(Given : $h = 6.63 \times 10^{-34}$ J.s and $c=3\times10^{8}$ m/s)
Q9.
mcq single
+4 / 1
Identify the correct statements :
A. Electrostatic field lines form closed loops.
B. The electric field lines point radially outward when charge is greater than zero.
C. The Gauss - Law is valid only for inverse-square force.
D. The work done in moving a charged particle in a static electric field around a closed path is zero.
E. The motion of a particle under Coulomb's force must take place in a plane.
Choose the **correct** answer from the options given below :
Q10.
mcq single
+4 / 1
**Identify the correct statements :**
A. Effective capacitance of a series combination of capacitors is always smaller than the smallest capacitance of the capacitor in the combination.
B. When a dielectric medium is placed between the charged plates of a capacitor, displacement of charges cannot occur due to insulation property of dielectric.
C. Increasing of area of capacitor plate or decreasing of thickness of dielectric is an alternate method to increase the capacitance.
D. For a point charge, concentric spherical shells centered at the location of the charge are equipotential surfaces.
Choose the **correct** answer from the options given below :
Q11.
mcq single
+4 / 1
For a transparent prism, if the angle of minimum deviation is equal to its refracting angle, the refractive index $n$ of the prism satisfies.
Q12.
mcq single
+4 / 1
A biconvex lens is formed by using two thin planoconvex lenses, as shown in the figure. The refractive index and radius of curved surfaces are also mentioned in figure. When an object is placed on the left side of lens at a distance of 30 cm from the biconvex lens, the magnification of the image will be :
Q13.
mcq single
+4 / 1
A long cylindrical conductor with large cross section carries an electric current distributed uniformly over its cross-section. Magnetic field due to this current is:
**A.** maximum at either ends of the conductor and minimum at the midpoint
**B.** maximum at the axis of the conductor
**C.** minimum at the surface of the conductor
**D.** minimum at the axis of the conductor
**E.** same at all points in the cross-section of the conductor
Choose the **correct** answer from the options given below:
Q14.
mcq single
+4 / 1
The time period of a simple harmonic oscillator is $T = 2\pi \sqrt{\frac{k}{m}}$. Measured value of mass $(m)$ of the object is 10 g with an accuracy of 10 mg and time for 50 oscillations of the spring is found to be 60 s using a watch of 2 s resolution. Percentage error in determination of spring constant $(k)$ is ________%.
Q15.
mcq single
+4 / 1
The speed of a longitudinal wave in a metallic bar is 400 m/s. If the density and Young's modulus of the bar material are increased by 0.5% and 1%, respectively then the speed of the wave is changed approximately to ______ m/s.
Q16.
mcq single
+4 / 1
Match **List - I** with **List - II**.
List – I
List – II
A. Coefficient of viscosity**
B. Surface tension
C. Pressure
D. Surface energy
I. [ML^(−1)T^(−2)]
II. [ML^(2)T^(−2)]
III. [ML^(0)T^(−2)]
IV. [ML^(−1)T^(−1)]
Choose the correct** answer from the options given below :
Q17.
mcq single
+4 / 1
In an experiment, a set of reading are obtained as follows - 1.24 mm, 1.25 mm, 1.23 mm, 1.21 mm. The expected least count of the instrument used in recording these readings is _______ mm.
Q18.
mcq single
+4 / 1
A particle starts moving from time $t=0$ and its coordinate is given as $x(t) = 4t^3 - 3t$
A. The particle returns to its original position (origin) 0.866 units later
B. The particle is 1 unit away from origin at its turning point
C. Acceleration of the particle is non-negative
D. The particle is 0.5 units away from origin at its turning point
E. Particle never turns back as acceleration is non-negative
Choose the **correct** answer from the options given below :
Q19.
mcq single
+4 / 1
A nucleus has mass number $\alpha$ and radius $R_{\alpha}$. Another nucleus has mass number $\beta$ and radius $R_{\beta}$.
If $\beta = 8\alpha$ then $R_{\alpha} / R_{\beta}$ is :
Q20.
numerical
+4 / 1
Two tuning forks *A* and *B* are sounded together giving rise to 8 beats in 2 s. When fork *A* is loaded with wax, the beat frequency is reduced to 4 beats in 2 s. If the original frequency of tuning fork *B* is 380 Hz then original frequency of tuning fork *A* is _________ Hz.
Q21.
mcq single
+4 / 1
A small block of mass **m** slides down from the top of a frictionless inclined surface, while the inclined plane is moving towards left with constant acceleration $a_0$. The angle between the inclined plane and ground is $\theta$ and its base length is $L$. Assuming that initially the small block is at the top of the inclined plane, the time it takes to reach the lowest point of the inclined plane is ________.
Q22.
mcq single
+4 / 1
Which one of the following is **not** a measurable quantity?
Q23.
mcq single
+4 / 1
A Wheatstone bridge is initially at room temperature and all arms of the bridge have same value of resistances ($R_1 = R_2 = R_3 = R_4$). When $R_3$ resistance is heated to some temperature, its resistance value has gone up by 10%. The potential difference ($V_a - V_b$) (after $R_3$ is heated) is _________ V.
Q24.
mcq single
+4 / 1
A plane electromagnetic wave is moving in free space with velocity $c = 3 \times 10^8$ m/s and its electric field is given as $\vec{E}=54\sin(kz - \omega t)\,\hat{j}$ V/m, where $\hat{j}$ is the unit vector along y-axis. The magnetic field vector $\vec{B}$ of the wave is :
Q25.
numerical
+4 / 1
An inductor stores 16 J of magnetic field energy and dissipates 32 W of thermal energy due to its resistance when an a.c. current of 2 A (rms) and frequency 50 Hz flows through it. The ratio of inductive reactance to its resistance is ______. ($\pi = 3.14$)