Let $$\alpha, \beta$$ be the roots of the equation $$x^2 - x + p = 0$$ and $$\gamma, \delta$$ be the roots of the equation $$x^2 - 4x + q = 0$$, where $$p, q \in \mathbb{Z}$$. If $$\alpha, \beta, \gamma, \delta$$ are in G.P., then $$|p + q|$$ equals :
Let $$f : \mathbb{N} \to \mathbb{Z}$$ be defined by $$f(n) = \det\begin{bmatrix} n & -1 & -5\\-2n^2 & 3(2k+1) & 2k+1 \\ -3n^3 & 3k(2k+1) & 3k(k+2)+1 \end{bmatrix}$$, $$k \in \mathbb{N}$$ and $$\displaystyle\sum_{n=1}^{k} f(n) = 98$$, then $$k$$ is equal to :
Let $$M$$ be a $$3 \times 3$$ matrix such that $$M\begin{bmatrix}1\\0\\0\end{bmatrix} = \begin{bmatrix}1\\2\\3\end{bmatrix}$$, $$M\begin{bmatrix}0\\1\\0\end{bmatrix} = \begin{bmatrix}0\\1\\0\end{bmatrix}$$, $$M\begin{bmatrix}0\\0\\1\end{bmatrix} = \begin{bmatrix}-1\\1\\1\end{bmatrix}$$. If $$M\begin{bmatrix}x\\y\\z\end{bmatrix} = \begin{bmatrix}1\\7\\11\end{bmatrix}$$, then $$x + y + z$$ is equal to :
The sum of the first 10 terms of the series $$\frac{1}{1 + 1^4 \cdot 4} + \frac{2}{1 + 2^4 \cdot 4} + \frac{3}{1 + 3^4 \cdot 4} + \cdots$$ is $$\frac{m}{n}$$, where $$\gcd(m, n) = 1$$. Then $$m + n$$ is equal to :
Let $$A_1, A_2, \ldots, A_{39}$$ be 39 arithmetic means between the numbers 59 and 159. The mean of $$A_{25}, A_{28}, A_{31} and A_{36}$$ is equal to :
The probabilities that players A and B of a team are selected for the captaincy for a tournament are 0.6 and 0.4, respectively. If A is selected the captain, the probability that the team wins the tournament is 0.8 and if B is selected the captain, the probability that the team wins the tournament is 0.7. Then the probability, that the team wins the tournament, is :
A variable $$X$$ takes values $$0, 0, 2, 6, 12, 20, \ldots, n(n-1)$$ with frequencies $${^{n} C_{0}}, {^{n} C_{1}}, {^{n} C_{2}}, \ldots, {^{n} C_{n}}$$ respectively. If the mean of the data is 60, then the median is :
Let the point $$P$$ be the vertex of the parabola $$y = x^2 - 6x + 12$$. If a line passing through the point $$P$$ intersects the circle $$x^2 + y^2 - 2x - 4y + 3 = 0$$ at the points $$R$$ and $$S$$.then the maximum value of $$(PR + PS)^2$$ is :
Let the directrix of the parabola $$P: y^2 = 8x$$ cuts the x-axis at the point $$A$$.Let $$B(\alpha, \beta)$$, $$\alpha > 1$$, be a point on $$P$$ such that the slope of $$AB$$ is $$3/5$$. If $$BC$$ is a focal chord of chord of $$P$$. then six times the area off $$(\triangle ABC)$$ is :
Let the eccentricity $$e$$ of a hyperbola satisfy the equation $$6e^2 - 11e + 3 = 0$$. Its foci of the hyperbola are $$(3, 5)$$ and $$(3, -4)$$.then the length of its latus rectum is :
Let a $$\triangle PQR$$,be such that $$P$$ and $$Q$$ lie on the line $$\frac{x+3}{8} = \frac{y-4}{2} = \frac{z+1}{2}$$ and are at a distance of 6 units from $$R(1, 2, 3)$$. If $$(\alpha, \beta, \gamma)$$ is the centroid of $$\triangle PQR$$, then $$\alpha + \beta + \gamma$$ is equal to :
Let the distance of the point $$(a, 2, 5)$$ from the image of the point $$(1, 2, 7)$$ in the line $$\frac{x}{1} = \frac{y-1}{1} = \frac{z-2}{2}$$ is 4,then the sum of all possible values of $$a$$ is equal to:
Let $$O$$ be the origin, $$\overrightarrow{OP} = \vec{a}$$ and $$\overrightarrow{OQ} = \vec{b}$$.If $$R$$ is the point on $$\overrightarrow{OP}$$ such that $$\overrightarrow{OP} = 5\overrightarrow{OR}$$, and $$M$$ is the point such that $$\overrightarrow{OQ} = 5\overrightarrow{RM}$$. Then $$\overrightarrow{PM}$$ is equal to :
Let $$f(x) = \displaystyle\lim_{y \to 0} \frac{(1 - \cos(xy))\tan(xy)}{y^3}$$. Then the number of solutions of the equation $$f(x) = \sin x$$, $$x \in \mathbb{R}$$, is :
Let $$(2^{1-a} + 2^{1+a})$$, $$f(a)$$, $$(3^a + 3^{-a})$$ be in A.P. and $$\alpha$$ be the minimum value of $$f(a)$$, Then the value of the integral $$\displaystyle\int_{\log_e(\alpha - 1)}^{\log_e(\alpha)} \frac{dx}{e^{2x} - e^{-2x}}$$ is equal to :
Let $$f : [1, \infty) \to \mathbb{R}$$ be a differentiable defined as $$f(x) = \displaystyle\int_1^x f(t)\,dt + (1 - x)(\log_e x - 1) + e$$. Then the value of $$f(f(1))$$ is :
Let $$f(x)$$ and $$g(x)$$ be twice differentiable functions satisfying $$f''(x) = g''(x)$$ for all $$x$$, $$f'(1) = 2g'(1) = 4$$, and $$g(2) = 3f(2) = 9$$. Then $$f(25) - g(25)$$ is equal to :
Let $$A = \{1, 4, 7\}$$ and $$B = \{2, 3, 8\}$$. Then the number of elements, in the relation $$R = \{((a_1, b_1), (a_2, b_2)) \in (A \times B) \times (A \times B) : a_1 + b_2 \text{ divides } a_2 + b_1\}$$. is :
From the point $$(-1, -1)$$, two rays are sent making angle of $$45°$$ with the line $$x + y = 0$$. The rays get reflected from the mirror $$x + 2y = 1$$. If the equations of the reflected rays are $$ax + by = 9$$ and $$cx + dy = 7$$,$$a,b,c,d \in \mathbb{Z}$$ thenthe value of $$ad + bc$$ is :
Let $$S = \left\{\theta \in [-\pi, \pi] : \cos\theta \cos\left(\frac{5\theta}{2}\right) = \cos 7\theta \cos\left(\frac{7\theta}{2}\right)\right\}$$. Then $$n(S)$$ is equal to :
Let $$f : \mathbb{R} \to \mathbb{R}$$ be a function such that $$f(x) + 3f\left(\frac{\pi}{2} - x\right) = \sin x, x \in R$$.Let the maximum value of $$f$$ on $$\mathbb{R}$$ be $$\alpha$$. The area of the region bounded by the curves $$g(x) = x^2$$ and $$h(x) = \beta x^3$$, $$\beta > 0$$, is $$\alpha^2$$. Then $$30\beta^3$$ is equal to :
Let $$y = y(x)$$ be the solution of $$(\tan x)^{1/2}\,dy = (\sec^3 x - (\tan x)^{3/2}\,y)\,dx$$, $$0 < x < \frac{\pi}{2}$$. If $$y\left(\frac{\pi}{4}\right) = \frac{6\sqrt{2}}{5}$$, and $$y\left(\frac{\pi}{3}\right) = \frac{4}{5}\alpha$$, then $$\alpha^4$$ is equal to :
Where (Plank's constant), G(gravitational constant) and c (speed of light in vacuum) as fundamental units. Choose the correct answer from the options given below:
In an experiment to determine the resistance of a given wire using Ohm’s law, the voltmeter and ammeter readings are noted as $$10 V$$ and $$5 A$$, respectively. The least counts of voltmeter and ammeter are $$500 mV$$ and $$200 mA$$, respectively. The estimated error in the resistance measurement is_______Ω.
A mass of 1 kg is kept on a inclined plane with 30° inclination with respect to horizontal plane and it is at rest initially. Then the whole assembly is moved up with constant velocity of 4 m/s. The work done by the frictional force in time 2 s is ________ J. (Take g = 10 m/s²)
The velocity (v) versus time (t) plot of a particle is shown in the figure, for a time interval of 40 s. The total distance travelled by the particle and the and the average velocity during this period are, respectively___________,
A wheel initially at rest is subjected to a uniform angular acceleration about its axis. In the first 2 s, it rotates through an angle $$\theta_1$$. In the next 2 s, it rotates through an angle $$\theta_2$$. Then the ratio $$\frac{\theta_2}{\theta_1}$$ is :
An object of uniform density rolls up a curved path with the initial velocity $$v_{\circ}$$ as shown in the figure. If the maximum height attained by an object is $$\frac{7v_0^2}{10g}$$. (g = acceleration due to gravity), The object is a :
A body of mass $$m$$ is taken from the surface of the earth to a height equal to twice the radius of earth$$(R_e)$$. The increase in potential energy will be : (g is acceleration due to gravity at the surface of earth)
Eight mercury drops, each of radius $$r$$ coalesce to form a bigger drop. The surface energy released in this process is_________ . ( S is the surface tension of mercury).
An ideal gas at pressure $$P$$ and temperature $$T$$ is expanding such that $$PT^3 = \text{constant}$$. The coefficient of volume expansion of the gas is :
A metal rod of length $$L$$ rotates about one end at origin with a uniform angular velocity $$\omega$$. The magnetic field radially falls off as $$B(r) = B_0 e^{-\lambda r}$$. $$\lambda$$ being a positive constant. The EMF induced (neglecting the centripetal force on electrons in the rod) is :
A particle of charge $$q$$ and mass $$m$$ is projected from origin with an initial velocity has $$\vec{v} = \frac{v_0}{\sqrt{2}}\hat{x} + \frac{v_0}{\sqrt{2}}\hat{y}$$. There exists a uniform magnetic field $$\vec{B} = B_0\hat{z}$$ and a space varying electric field $$\vec{E} = E_0 e^{-\lambda x}\hat{x}$$ within the region $$0 \leq x \leq L$$. After travelling a distance such that x-coordinate has changed from $$x=0$$ to $$x=L$$, the change in the kinetic energy is_________.
Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The Electromagnetic waves exert pressure on the surface on which they ar allowed to fall.
Reason (R): There is no mass associated with the electromagnetic waves.
In the light of the above statements, Choose the correct answer from the options given below :
A thin convex lens and a thin concave lens are kept in contact and are co-axial. Which of the following statements is correct for this combination of two lenses ?
An object AB is placed 15 cm to the left of a convex lens P of focal length $$10 cm$$. Another convex lens Q is now placed $$15 cm$$ right of lens P . If the focal length of lens Q is 15 cm, final image is______.
The maximum intensity in a Young's double slit experiment is $$I_0$$, distance between the slits (d) is $$5\lambda$$, where $$\lambda$$ is the wavelength of light used. The intensity of the fringe, exactly opposite to one of the slits on the screen, placed at $$D = 10d$$ is_________.
An electron is travelling with a velocity $$v$$ in free space and when it enters a medium, its velocity is reduced by 20%. The de Broglie wavelength of electron in the medium is $$\alpha \lambda_0$$.where $$\lambda_0$$ is its de Broglie wavelength in free space. The value of $$\alpha$$ is :
Assuming the experimental mass of $$^{12}_{6}C$$ as 12 u, The mass defect of $${}^{12}\text{C}$$ atom is (in MeV/$$c^2$$) :
(Mass of proton = 1.00727 u, mass of neutron = 1.00866 u, 1 u = 931.5$$ $$MeV/$$c^2$$ and c is the speed of the light in vacuum).
In a semiconductor p-n diode, the doping concentrations on p-side has $$10^{15}$$ atoms/cm³ and the n-side has $$10^{18}$$ atoms/cm³respectively. Which one of the following statements is true?
A copper wire of length 3 m is stretched by 3 mm by applying an external force. The volume of the wire is $$600 \times 10^{-6}$$ m³. The elastic potential energy stored in the wire in stretched condition would be _______ J : (Given Young's modulus of copper $$ = 1.1 \times 10^{11}$$ N/m²)
The heat extracted out of x gram of water initialy at $$50°$$C to cool it down to $$0°$$C is sufficient to evaporate $$(1000 - x)$$ gram of water also initialy at $$50°$$C. The value of $$x$$ (closest integer) is_______. (Take Latent heat of water $$L = 2256$$ kJ/kg K, specific heat capacity of water $$c = 4200$$ J/kg·K)
In a series LCR circuit with , $$R = 20\,\Omega$$, $$L = 1.6$$ H, $$C = 40\,\mu$$F is connected to a variable frequency a.c. source. The inductive reactance at resonant frequency is ____________ $$\Omega$$.
When an external resistance of $$5\,\Omega$$ is connected across terminals of a cell, a current of $$0.25$$ A flow through it. When the $$5\,\Omega$$ resistor is replaced by a $$2\,\Omega$$ resistor, a current of $$0.5$$ A flow through it. The internal resistance of the cell is________ $$\Omega$$.
A circular loop of radius $$r = 20$$ cm and resistance $$R = 2\,\Omega$$ is placed in a time varying magnetic field $$B = (2t^2 + 2t + 3)$$ T. At $$t = 0$$, for the plane of the loop being perpendicular to the magnetic field and, The induced current in the loop at $$t = 3$$ s is $$\frac{\alpha}{50}$$ A. The value of $$\alpha$$ is__________. (Take $$\pi = 22/7$$)
The covalent radii of atoms A and B are $$r_A$$ and $$r_B$$ respectively. The covalent bond length and total length of $$AB$$ molecule are respectively :
Consider the following data for the reaction $$\text{X}_2(g) + \text{Y}_2(g) \rightleftharpoons 2\text{XY}(g)$$ at 600 K. The $$\Delta_r G^\circ$$ (in $$kJ/mol^{-1}$$) for the reaction is :
The reaction $$A(g) \rightleftharpoons B(g) + C(g)$$ was initiated with the amount `$$a$$` of $$A(g)$$. At equilibrium it is found that the amount of $$A(g)$$ remaining is $$(a - x)$$ at a total pressure of $$p$$. The equilibrium constant $$K_p$$ of the reaction can be calculated from the expression:
One half cell in a voltaic cell is constructed by dipping silver rod in $$\text{AgNO}_3$$ solution of unknown concentration, other half cell is Zn rod dipped in 1 molar solution of $$\text{ZnSO}_4$$. A voltage of $$1.60\,\text{V}$$ is measured at $$298\,\text{K}$$ for this cell. What is the concentration of $$\text{Ag}^+$$ ions used in terms of $$\log x$$ $$(x = [\text{Ag}^+])$$?
$$\textbf{Statement I :}$$ The number of pairs among $$[\text{Al}_2\text{O}_3, \text{Cr}_2\text{O}_3]$$, $$[\text{Cl}_2\text{O}_7, \text{Mn}_2\text{O}_7]$$, $$[\text{Na}_2\text{O}, \text{V}_2\text{O}_3]$$ and $$[\text{CO}, \text{N}_2\text{O}]$$ that contain oxides of same nature (acidic, basic, neutral or amphoteric) is 4.
$$\textbf{Statement II :}$$ Among $$\text{Na}_2\text{O}$$, $$\text{Al}_2\text{O}_3$$, $$\text{CO}$$ and $$\text{Cl}_2\text{O}_7$$, the most basic and acidic oxides are $$\text{Na}_2\text{O}$$ and $$\text{Cl}_2\text{O}_7$$, respectively.
In the light of the above statements, choose the correct answer from the options given below:
$$\textbf{Statement I :}$$ Aluminium upon reaction with $$\text{NaOH}$$ forms $$[\text{Al(OH)}_6]^{3-}$$ ion.
$$\textbf{Statement II :}$$ The geometry of $$\text{ICl}_4^{-}$$, $$\text{ClO}_3^{-}$$ and $$\text{IBr}_2^{-}$$ is square planar, pyramidal and linear respectively.
In the light of the above statements, choose the correct answer from the options given below:
Identify the correct statements from the following
$$\textbf{A.}$$ $$[\text{Fe}(\text{C}_2\text{O}_4)_3]^{3-}$$ is the most stable complex among $$[\text{Fe}(\text{OH})_6]^{3-}$$, $$[\text{Fe}(\text{C}_2\text{O}_4)_3]^{3-}$$ and $$[\text{Fe}(\text{SCN})_6]^{3-}$$
$$\textbf{B.}$$ The stability of $$[\text{Cu}(\text{NH}_3)_4]^{2+}$$ is greater than that of $$[\text{Cu}(\text{en})_2]^{2+}$$
$$\textbf{C.}$$ The hybridization of Fe in $$\text{K}_4[\text{Fe}(\text{CN})_6]$$ is $$d^2sp^3$$
$$\textbf{Statement I :}$$ Heating benzamide with bromine in an ethanolic solution of sodium hydroxide will give benzylamine.
$$\textbf{Statement II :}$$ Nitration of aniline with $$\text{HNO}_3/\text{H}_2\text{SO}_4$$ at $$288\,\text{K}$$ produces $$m$$-nitroaniline in higher amount than $$o$$-nitroaniline (pH adjusted).
In the light of the above statements, choose the correct answer from the options given below:
are two anomers of D-(+)-glucose.
Statement II: the Open chain forms of D-glucose and D-fructose contain three similar chiral carbons at C₃, C₄, and C₅. In the light of the above statements, choose the correct answer from the options given below:
The total number of unpaired electrons present in the $$d^3$$, $$d^4$$ (low spin), $$d^5$$ (high spin), $$d^6$$ (high spin), and $$d^7$$ (low spin) octahedral complexes systems is :
$$\text{RMgI}$$ when treated with ice cold water liberated a gas which occupied $$1.4\,\text{dm}^3/\text{g}$$ at STP. The gas produced is further reacted with iodine in presence of $$\text{HIO}_3$$ to give compound (X). Compound (X) in presence of Na and dry ether produced compound (Y). Molar mass of compound (Y) is $$\underline{\hspace{2cm}}$$ $$\text{g mol}^{-1}$$. (Nearest integer)
20 g hemoglobin in a 1 L aqueous solution (A) at 300 K is separated from pure water by a semi-permeable membrane. At equilibrium, the height of solution in a tube dipped in solution (A) is found to be $$80.0 mm$$ higher than the tube dipped in water. The molar mass of hemoglobin is ______ $$kg mol^{-1}$$. (Nearest integer) (Given: $$g = 10 \, m \, s^{-2}$$, $$R = 8.3 \, kPa \, dm^{3} \, K^{-1} \, mol^{-1}$$, density of solution = $$1000 \, kg \, m^{-3}$$)
At 298 K, the molar conductivity of an $$x\%$$ (w/w) MX solution is 123.5 S cm$$^{2} mol^{-1}$$. The conductance of same solution is $$1.9 \times 10^{-3} S$$. The value of x is ______ $$\times 10^{-2}$$. (Given: Cell constant = 1.3 cm$$^{-1}$$, molar mass of MX = 75 $$g mol^{-1}$$, density of aqueous solution of $$MX$$ at 298 K is 1.0 $$g mL^{-1}$$)
For the reaction $$A \to p$$ at $$T K$$, the half life ($$t_{1/2}$$) is plotted as a function of initial concentration $$[A]_o$$ of $$A$$ as give below.
The value of $$x$$ in the given figure is ______ s (Nearest integer)