Calculate the mass of $100$ molecules of oxygen in amu and in grams.

Match List I with List II

List I Element	List II Number of Neutron
(A). ${}^{24}_{12}Mg$	(I). $5$
(B). ${}^{27}_{13}Al$	(II). $12$
(C). ${}^{9}_{4}Be$	(III). $6$
(D). ${}^{12}_{6}C$	(IV). $14$

Choose the correct answer from the options given below:

Which of the following hydrides of Group $16$ elements has highest reducing property?

Identify the shape of $\text{IF}_5$ molecule from the following options.

According to the kinetic molecular theory of gases, the average kinetic energy of gas molecules:

Calculate the enthalpy change for the following reaction, using given bond energy (kJ/mol)
(C-H = $414$, H-O = $463$, H-Cl = $431$, C-Cl = $326$ and C-O = $335$)
$\text{CH}_3\text{OH}_{(g)} + \text{HCl}_{(g)} \rightarrow \text{CH}_3\text{Cl}_{(g)} + \text{H}_2\text{O}_{(g)}$

Calculate the work done when $1$ mole of an ideal gas is expanded reversibly and isothermally from initial pressure $10$ bar to final pressure $1$ bar at constant temperature $300$ K. [$R = 8.314 \text{ J K}^{-1} \text{ mol}^{-1}$]

Which of the following processes exhibits, $\Delta U = 0$?

Which of the following aqueous solution of salt have $pH < 7$ at $298$ K?

What happens when solid $\text{Na}_2\text{CO}_3$ dissolved in water?

What happens when $\text{CuSO}_4$ is dissolved in water?
Identify correct statements from the following

Which of the following is obtained when dihydrogen reacts with the alkali metals at high temperature?

What type of isomerism is exhibited by neopentane?

Which from following is obtained as major product when methoxybenzene is treated with nitrating mixture?

Which of the following compounds is carcinogenic and toxic?

Pt has FCC structure with an edge length of unit cell $392$ pm. What is the radius of Pt?

In a cubic unit cell of an ionic compound, the eight corners are occupied by anions and cations at the center of the cube. Calculate the volume of the unit cell if density of the unit cell is $4 \text{ g cm}^{-3}$.
[Molar mass of compound $= 168.6$ g mol$^{-1}$ and $N_A = 6.022 \times 10^{23}$]

What is the total number of spheres that surrounds the tetrahedral hole in the close-packed three-dimensional structure?

Which of the following is a green alternative for dry cleaning solvents?

Vapour pressure of $\text{CCl}_4$ at $25^\circ$C is $143$ mm Hg. If $0.5$ g of a non-volatile solute is dissolved in $100 \text{ cm}^3$ of $\text{CCl}_4$. Find the vapour pressure of the solution.
(Density of $\text{CCl}_4 = 1.58 \text{ g}/\text{cm}^3$ and molecular weight of solute is $65$)

The solubility of $\text{N}_2$ gas in water at $25^\circ$C and $1$ bar is $6.85 \times 10^{-4} \text{ mol L}^{-1}$. Calculate the solubility of $\text{N}_2$ gas in water at the same temperature when the partial pressure of $\text{N}_2$ is $0.70$ bar

Identify from the following pair of solutions that exhibits the same osmotic pressure.
[molar mass of urea $= 60$ g mol$^{-1}$ and molar mass of glucose $= 180$ g mol$^{-1}$]

At $298$ K, the specific conductance ($\kappa$) of a $0.0020$ M NaCl solution is $2.50 \times 10^{-4} \text{ S cm}^{-1}$. Calculate the molar conductivity ($\Lambda_m$) of the solution in $\text{S cm}^2 \text{ mol}^{-1}$.

Which of the following statements is correct regarding electrolysis of molten NaCl?

Which of the following statements is true about the voltaic cell?

Identify the function of salt bridge.

A first order reaction complete $60$% in $20$ minutes. How long will the reaction take to complete $84$%?

The rate constant for a first order reaction is $60 \text{ s}^{-1}$. How much time will it take to reduce the concentration of the reactant to $1/20^{\text{th}}$ of its initial value?

Which of the following statements is NOT true about the rate constant?

Which of the following assertions about the extent of physisorption is correct?

Which of the following is not characteristics of interhalogen compounds?

Identify the set of paramagnetic ions among the following.

Why zinc does not exhibit variable oxidation states?

Identify the hybridization in central metal of $[\text{Fe}(\text{CO})_5]$ complex.

In a complex compound, central metal ion is

Which one of the following factors proceeds more rapidly, unimolecular nucleophilic substitution reaction?

Wurtz reaction is NOT possible with

The major product 'B' in the below mentioned reaction is-

Which from following is a suitable method for preparation of ether?

The molecule with a maximum boiling point is

Which of the following reactions is an example of a disproportionation reaction?

Acetaldehyde, when heated in the presence of sodium hydroxide and iodine forms

Identify the product obtained when Grignard reagent reacts with alkyl cyanide followed by acid hydrolysis.

Which of following amines exhibits carbylamine test?

Identify the product obtained when RCN is treated with sodium and alcohol.

The reaction of glucose with acetic Anhydride, confirms the

The secondary structure of protein is determined by

Which of the following compounds are used to obtain terylene polymer?

Which of the following polymers is also called as dacron?

What type of drug the aspirin is?

If $A = \{1, 2, 3, 4, 5\}$, then which of the following statements is not true?

If $-1 + \sqrt{-3} = r e^{i\theta}$, then the value of $\theta$ is

There are $5$ boys and $3$ girls seated in a row for a photograph. The number of ways in which a photograph can be taken if the girls occupy only odd places is...

The value of the expression $\tan(x - 9\pi)$ is equal to:

The principal solutions of $\text{cosec}(\theta) = -2$ are...

The equation of a line passing through the point of the intersection of the lines $x - y + 1 = 0$ and $2x + 3y - 8 = 0$ and having x intercept $3$ is

If the equation $x^2 - ky^2 - 4x + 6y - 5 = 0$ represents a pair of straight lines, then their point of intersection is

The equation of a circle which passes through the points $(2,3)$ and $(4,5)$ and whose center lies on the straight line $y - 4x + 3 = 0$ is

The value of $\lim_{x \to 3} \dfrac{[x] - 3}{x - 3}$, where $[\cdot]$ denotes the greatest integer function, is.....

If the truth value of the compound statement $[(p \vee q) \wedge (q \rightarrow r) \wedge (\sim r)] \rightarrow (p \wedge q)$ is False then the truth values of $p \rightarrow q$ and $q \rightarrow p$ are respectively......

The statement pattern $(p \vee q) \rightarrow \sim r$ is logically equivalent to

In $\triangle ABC$, with usual notations, if $\cos A = \dfrac{1}{2}, a = 3, \angle B = \dfrac{\pi^c}{6}$, then the values of $b$ and $c$ are.....

If $A = \dfrac{1}{2}\begin{bmatrix} -1 & -\sqrt{3} \\ \sqrt{3} & -1 \end{bmatrix}$ then $A^{-1} - A^2$ is not

If $A = \begin{bmatrix} 2i & i^3 \\ i^2 & 1 \end{bmatrix}$, then $A^{-1}$ is equal to

The minimum value of $(\sin^{-1} x)^2 + (\cos^{-1} x)^2$ is............

If $\tan^{-1}(1) + \tan^{-1}(3) + \tan^{-1}(5) + \tan^{-1}\left(\dfrac{1}{4}\right) = \pi + \tan^{-1}\left(\dfrac{\alpha}{2}\right)$, then the value of $\alpha$ is...

The domain of the function $f(x) = \sqrt{x - 1} + \sqrt{3 - x}$ is ...

Let the function $f(x)$ be defined as:
$f(x) = \begin{cases} \left[\tan\left(\dfrac{\pi}{4} + x\right)\right]^{\dfrac{1}{x}}, & x \neq 0 \\ k, & x = 0 \end{cases}$
If $f(x)$ is continuous at $x = 0$, then the value of $k$ is...

If $y = f\left(\dfrac{3 + 2x}{3 - 2x}\right)$, where $f(x) = \tan(\log x)$ and $\dfrac{dy}{dx} = \left(\dfrac{A}{B + C x^2}\right) \cdot \sec^2\left(\log\left(\dfrac{3 + 2x}{3 - 2x}\right)\right)$, then the respective values of A, B and C are ......

If $y = \sqrt{x^2 + 8x + 3}$, then the value of $\dfrac{d^2 y}{dx^2}$ at $x = 3$ is

If $y = \sqrt{\tan x + \sqrt{\tan x + \sqrt{\tan x + \cdots \cdots \cdots \infty}}}$, then $\left(\dfrac{dy}{dx}\right)^2$ at $x = \dfrac{\pi}{4}$ is

If $y = \sqrt{x + \sqrt{x^2 + 1}}$, then the value of $\dfrac{dy}{dx}$ is

If $y = \sin(e^{\log 2x})$, then the value of $\dfrac{dy}{dx}$ at $x = \dfrac{\pi}{2}$ is

The difference between the local extreme values of the function $f(x) = 2x^3 - 15x^2 + 36x + 40$ is ......

A wire of length $64$ m is to be bent to form a rectangle such that its area is maximum, then its area is.....

The approximate value of $\sqrt[3]{63}$ is

The equation of the tangent to the curve $y = 3x^3 - 3x^2 + x$ at $x = 1$ is

$\int \dfrac{x + 2}{x^2 - 7x + 12} dx$ is equal to

If $\int \dfrac{dx}{\sqrt{2ax - x^2}} = f(g(x)) + c$, where $c$ is constant of integration, then $f(x), g(x)$ are respectively equal to

$\int \dfrac{x}{x + 2} dx$ is equal to

If $[\cdot]$ denotes the greatest integer function, then $\int_1^4 x[x] dx$ is equal to

If $\int_1^a (2x + 1) dx = 5$, then the sum of the values of $a$ is..

The area of the shaded region is ... sq.units.

$\int_0^3 \sqrt{9 - x^2} dx = $

The particular solution of the differential equation $xdy + 2ydx = 0$, when $x = 2$ and $y = 1$ is

The differential equation representing the family of curves $x \sin x + y^3 = 4ax$ is

The order and degree of the differential equation $\sqrt{2 + \left(\dfrac{d^2 y}{dx^2}\right)^3} = \left(\dfrac{d^3 y}{dx^3}\right)^{5/2}$ respectively are

The vector $\bar{a} + 3\bar{b}$ is perpendicular to $7\bar{a} - 5\bar{b}$ and the vector $\bar{a} - 4\bar{b}$ is perpendicular to $7\bar{a} - 2\bar{b}$. Then the angle between $\bar{a}$ and $\bar{b}$ is

If $7\hat{j} + 10\hat{k}, -\hat{i} + 6\hat{j} + 6\hat{k}$ and $-4\hat{i} + 9\hat{j} + 6\hat{k}$ are the position vectors of the vertices A, B and C repectively of $\triangle ABC$. Then the position vector of the point where the bisector of the angle A meets side BC is

If $a, b, c$ are distinct non-negative numbers and the vectors $a\hat{i} + a\hat{j} + c\hat{k}, \hat{i} + \hat{k}, c\hat{i} + c\hat{j} + b\hat{k}$ lie in the same plane, then the value of $c$ is...

Let $A(2,3,0)$, $B(0,3,2)$ and $C(4,0,3)$ be vertices of a triangle, then the area of the triangle is

If D and E are the midpoints of the sides BA and BC of triangle ABC, then $\overline{AE} + \overline{DC} = $

If the points $(1, 1, \mu)$ and $(-3, 0, 1)$ are equidistant from the plane $\vec{r} \cdot (3\hat{i} + 4\hat{j} - 12\hat{k}) + 13 = 0$, then the value of $\mu$ are

If the lines $\dfrac{x-1}{2} = \dfrac{y+1}{3} = \dfrac{z-1}{4}$ and $\dfrac{x-2}{1} = \dfrac{y+m}{2} = \dfrac{z-2}{1}$ intersect each other, then the value of $m$ is....

If the lines $L_1: \dfrac{x-1}{-3} = \dfrac{y-2}{2k} = \dfrac{z-3}{2}, L_2: \dfrac{x-1}{3k} = \dfrac{y-5}{1} = \dfrac{z-6}{-5}$ are perpendicular to each other, then the equation of a plane containing the line $L_1$ and parallel to the line $L_2$ for the value of $k$ that satisfies this condition is ...

A plane meets the coordinate axes at points A, B and C, such that the centroid of a triangle ABC is $\left(2, -\dfrac{2}{3}, \dfrac{1}{2}\right)$. The perpendicular distance from the origin to this plane is...

The point at which the maximum value of $x + y$ subject to constraints $x + 2y \leq 70$ and $2x + y \leq 95, x \geq 0, y \geq 0$ is.

Let $X \sim B(n, p)$. If $E(X) = 2$ and $\text{Var}(X) = 1$, then the probability of getting at most one success is .....

If the following function is probability density function of r.v. X
$f(x) = kx^2(1-x)$, for $0 < x < 1 = 0$, otherwise, then the value of $k$ is

Two cards are drawn at random from a standard pack of $52$ cards. Then the probability that the draw consists of exactly one face card and exactly one ace card is...

The period of oscillation of a simple pendulum is given by $T = 2\pi \sqrt{\dfrac{l}{g}}$ where $l$ is about $80$ cm and is known to have $0.1$ cm accuracy. The period is about $1.5$ s. The time of $50$ oscillations is measured by a stop watch of least count $0.1$ s. The percentage error in $g$ is nearly

A car passes three points A, B and C at $3$ m/s, $6$ m/s and $9$ m/s respectively in a straight line with uniform acceleration. If distance $AB = 60$ m then find the distance BC.

A particle of mass $m$ is moving in a circular path of constant radius $r$ such that its centripetal acceleration $a_c$ is varying with time $t$ as, $a_c = k^2 r t^2$. The power delivered to the particle by the forces acting on it is ($K$ = constant)

The position vector of a particle is $\vec{r} = a \cos \omega t \hat{i} + a \sin \omega t \hat{j}$. Calculate the angle between its position vector and the velocity vector.
($\cos 0=1, \cos 90=0, \cos 60=0.5, \sin 30=0.5, \sin 0=0$)

Two massless springs of spring constants $K_1$ and $K_2$ are connected one after the other forming a single chain, suspended vertically and a certain mass is attached to the free end. If $x_1$ and $x_2$ are their respective extensions and 'F' is their stretching force, the total extension produced is

A wheel is rotating at $600$ rpm about its axis of rotation. When the power is cut off, it comes to rest in half a minute. Its angular retardation expressed in $\text{rad}/\text{s}^2$ is (retardation is uniform)

A flywheel rotating about a fixed axis has a kinetic energy of $500$ joule, if its angular frequency is $5$ Hz, then calculate the moment of inertia of the wheel about the axis of rotation. ($\pi^2=10$)

Given below are two statements:
Statement I: Acceleration due to earth's gravity decreases as you go 'up' or 'down' from earth's surface.
Statement II: Acceleration due to earth's gravity is same at a height '$h$' and depths '$d$' from earth's surface, if $h = d$.
In the light of above statements, choose the most appropriate answer from the options given below.

Two rain drops of same radius '$r$' falling with same terminal velocity '$V$' merge and form bigger drop of radius '$R$'. The terminal velocity of big drop is

A spherical ball of radius $1$ mm and density $10.5$ g/cc is dropped in glycerine of coefficient of viscosity $9.8$ poise and density $1.5$ g/cc. Viscous force on the ball when it attains constant velocity is $3696 \times 10^{-x}$ N. The value of $x$ is
(Given, $g = 9.8 \text{ m}/\text{s}^2$ and $\pi = \dfrac{22}{7}$)

A vessel contains oil (density $= 0.8 \text{ gm}/\text{cm}^3$) over mercury (density $= 13.6 \text{ gm}/\text{cm}^3$). A homogeneous sphere floats with half of its volume immersed in mercury and the other half in oil. The density of the material of the sphere in $\text{gm}/\text{cm}^3$ is

Three identical heat conducting rods are connected in series as shown in the figure. The rods on the side have thermal conductivity $2K$ while that in the middle has thermal conductivity $K$. The left end of the combination is maintained at temperature $3T$ and the right end at $T$. The rods are thermally insulated from outside. In steady state, temperature at the left junction is $T_1$ and that at the right junctions is $T_2$. The ratio $T_1/T_2$ is

A wire of length $L$ and diameter $d$ is used in a bulb. The temperature of wire is $T$ and power radiated by the wire is $P$. Its emissivity is ($\sigma$ = Stefan's constant) (Assume that emissivity of wire material is same at all wavelength)

The energy spectrum of a black body exhibits a maximum of wavelength $\lambda_0$. The temperature of the black body is now changed such that the energy is maximum at wavelength $\dfrac{3\lambda_0}{2}$. The ratio of power radiated by the black body will be

An ideal gas undergoes cyclic process ABCDA as shown in given p-V diagram. What is the magnitude of amount of work done by the gas?

Two samples A and B of gas initially at the same pressure and temperature. They are compressed from volume $V$ to $\dfrac{V}{2}$ (A isothermally and B adiabatically). The relation between pressure of the gas A ($P_A$) and pressure of gas B ($P_B$) is

A vessel has $6$ gram of hydrogen at pressure $P$ and temperature $500$ K. A small hole is made in it so that hydrogen leaks out. How much hydrogen leaks out if the final pressure is $\dfrac{P}{2}$ and the temperature falls to $300$ K?

A particle executes simple harmonic motion between $x = -A$ and $x = +A$. If time taken by particle to go from $x = 0$ to $\dfrac{A}{2}$ is $2$s, then time taken by particle in going from $x = \dfrac{A}{2}$ to A is

There is a body having mass $m$ and performing SHM with amplitude '$a$'. There is a restoring force $F=-Kx$, where $x$ is the displacement. The total energy of the body depends upon which of the following?

What is the effect of humidity on sound waves when humidity increases?

A tuning fork of frequency $n$ produces $x$ beats per second when sounded with a vibrating sonometer string. What must have been the frequency of the string, when a slight increase in tension produces lesser beats per second than before?

A string of length $0.5$ m and mass $10^{-3}$ kg is tightly clamped at its ends. The tension in the string is $0.8$ N. Identical wave pulses are produced at one end at equal intervals of time $\Delta t$. What is the minimum value of $\Delta t$ which allows constructive interference between successive pulses?

Which of the following statements is NOT TRUE?
a. Work done to move a charge on an equipotential surface is not zero.
b. Equipotential surfaces are the surfaces where the potential is constant.
c. Equipotential surfaces for a uniform electric field are parallel and equidistant from each other.
d. Electric field is always perpendicular to an equipotential surface.

Two metal sphere of radius $R$ and $3R$ have same surface charge density $\sigma$. If they are brought in contact and then separated, the surface charge density on smaller and bigger sphere becomes $\sigma_1$ and $\sigma_2$, respectively. The ratio $\dfrac{\sigma_1}{\sigma_2}$ is.

Three charges $q$, $Q$ and $+4q$ are placed in a straight line of length $d$ at points at distance $0$, $\dfrac{d}{3}$, $\dfrac{2d}{3}$ respectively. In order to make the net force on $q$ be zero, the value of $Q$ should be

Following figure indicates the electric potential V as a function through 4 regions on x-axis. Which of the following is correct for the electric field E in these regions?

A parallel plate capacitor has plate area $40 \text{ cm}^2$ and plates separation $2$ mm. The space between the plates is filled with a dielectric medium of a thickness $1$ mm and dielectric constant $5$. The capacitance of the system is

In a metre bridge experiment the balance point is obtained if the gaps are closed by $2$ $\Omega$ and $3\Omega$. A shunt of $X$ $\Omega$ is added to $3$ $\Omega$ resistor to shift the balancing point by $22.5$ cm. The value of $X$ is

A galvanometer has a current range of $10$ mA and a voltage range of $0.75$ V. To convert this galvanometer into an ammeter of range $10$ A, what is the shunt resistance?

Which of the following figure best represents the variation of magnetic susceptibility ($\chi$) with temperature for a diamagnetic substance?

A wire of length $L$ is bent in the form of a circular coil and current '$i$' is passed through it. This coil is kept in magnetic field. The torque acting on the coil will be maximum, when the number of turns is ___

Two long parallel wires carrying currents $8$A and $15$A in opposite directions are placed at a distance of $7$ cm from each other. A point P is at equidistant from both the wires such that the lines joining the point P to the wires are perpendicular to each other. The magnetic field at P is ___ $\times 10^{-6}$ T. (Given: $\sqrt{2} = 1.4$, $\mu_0 = 4\pi \times 10^{-7}$ SI unit)

A square loop of area $25 \text{ cm}^2$ has a resistance of $10$ $\Omega$. The loop is placed in uniform magnetic field of magnitude $40$ T. The plane of the loop is perpendicular to the magnetic field. The work done in pulling the loop out of the magnetic field slowly and uniformly in one second will be

A long rectangular conducting loop of width '$l$' mass '$m$' and resistance '$R$' is placed partly in a perpendicular magnetic field '$B$'. With what velocity should it be pushed downwards so that it may continue to fall without any acceleration? ($g$ = acceleration due to gravity)

The following figure represents two bulbs $B_1$ and $B_2$, resistor R and an inductor L. When the switch S is turned off, which of the following statement is true?

An inductor of reactance $100$ $\Omega$, a capacitor of reactance $50$ $\Omega$, and a resistor of resistance $50$ $\Omega$ are connected in series with an AC source of $10$ V, $50$ Hz. Average power dissipated by the circuit is ____

In an AC circuit $E = 50 \sin(500 t)$, $I = 600 \sin\left(500 t + \dfrac{\pi}{3}\right) mA$. What is the power dissipated in the circuit? [$\cos 60^\circ = 0.5$]

In the circuit shown below, the ac source has voltage $V = 30 \cos(\omega t)$ volt with $\omega = 2000$ rad/s. What will be the amplitude of the current?

For large magnifying power of a telescope

A ray of light is incident of the surface of a glass plate at an angle of incidence equal to Brewster's angle $\Phi$. If $\mu$ denotes the refractive index of glass w.r.t. air, then what will be the angle between reflected and refracted rays?

Two polaroid A and B placed in such a way that the pass-axis of polaroid are perpendicular to each other. Now, another polaroid C is placed between A and B bisecting angle between them. If intensity of unpolarised light is $I_0$ then intensity of transmitted light after passing through polaroid B will be

In a Young's double slit experiment, the intensities at two points, for the path difference $\dfrac{\lambda}{4}$ and $\dfrac{\lambda}{3}$ ($\lambda$ being the wavelength of light used) are $I_1$ and $I_2$ respectively. If $I_0$ denotes the intensity produced by each one of the individual slits, then $\dfrac{I_1 + I_2}{I_0} = $
$\left(\cos 45^\circ = \dfrac{1}{\sqrt{2}}, \cos 60 = \dfrac{1}{2}\right)$

Two light waves amplitudes in the ratio $3:1$ produce interference. The ratio of the maximum to minimum intensity is

Photoelectric emission is observed from a metallic surface for frequencies $v_1$ and $v_2$ of the incident light rays ($v_1 > v_2$). If the maximum values of kinetic energy of the photoelectrons emitted in the two cases are in the ratio of $k : 1$, then what is the threshold frequency of the metallic surface?

A photon and an electron have equal energy E. The ratio of $\lambda$(electron) to $\lambda$(photon) is proportional to

The kinetic energy of the electron in an orbit of radius $r$ in hydrogen atom is proportional to ($e$ = electronic charge)

The number of revolutions per second made by an electron in the first Bohr orbit of hydrogen atom is ($h$ = Planck's constant, $m$ is the mass of electron and $r$ is the radius of the orbit.)

What does the following combination of gates produce?

In common emitter transistor amplifier, the output resistance is $500$ k$\Omega$ and the current gain $\beta = 50$. If power gain of amplifier is $5 \times 10^6$, what is the input resistance?

When the conductivity of a semiconductor is only due to breaking of covalent bonds, the semiconductor is called