Recent questions in JEEMAIN and NEET

Aluminium is extracted by the electrolysis of :

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Refining of impure copper with zinc impurity is to be done by electrolysis using electrodes as :

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In a mixture of A and B, components show negative deviation when :

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$\beta$- particle is emitted in a radioactive reaction when :

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Heat required to raise the temperature of 1 mole of a substance by $1^{\circ}$ is called :

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Solubility of $Ca(OH)_2$ is $s \; mol\; L^{-1}$. The solubility product $(K_{sp})$ under the same condition is :

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In an organic compound of molar mass $108 \;g \; mol^{-1} C, \; H $ and $N$ atoms are present in $9 : 1 : 3.5$ by weight. Molecular formula can be :

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If $Fe^{3+}$ and $Cr^{3+}$ both are present in group III of qualitative analysis, then distinction can be made by :

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A substance forms Zwitter ion. It can have functional groups :

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The most stable ion is :

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Half-life of a substance A following first order kinetics is 5 days. Starting with 100 g of A, amount left after 15 days is :

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A metal M forms water soluble $MSO_4$ and inert $MO$. $MO$ in aqueous solution forms insoluble $M(OH)_2$ soluble in $NaOH$. Metal $M$ is :

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Following reaction $(CH_3)_3 CBr + H_2O \to (CH_3)_3 COH + HBr$ is an example of :

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Cyanide process is used for the extraction of :

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Which of the following concentration factor is affect by change in temperature ?

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Which of the following reaction is possible at anode ?

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On heating benzyl amine with chloroform and ethanolic $KOH$, product obtained is :

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Acetylene reacts with hypochlorous acid to form :

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For the following cell with hydrogen electrodes at two different pressure $p_1$ and $p_2$

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Compound A given below is :

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Acetylene does not react with :

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Which of the following ions has the maximum magnetic moment ?

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$KO_2$ is used in space and submarines because it :

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Number of $P-O$ bonds in $P_4O_{10}$ is :

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For an ideal gas, number of mol per litre in terms of its pressure P, temperature T and gas constant R is :

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Which of the following is a redox reaction ?

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A conducting square loop of side $L$ and resistance $R$ moves in its plane with a uniform velocity $v$ perpenticular to one of its sides. A magnetic induction $B$ constant in time and space, pointing perpendicular and into the plane at the loop exists everywhere with half the loop outside the field, aas shown in figure. The induced emf is :

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Formation of covalent bonds in compounds exhibits :

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Sodium and copper have work functions $2.3 eV$ and $4.5 eV$ respectively. Then the ratio of the wavelengths is nearest to :

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At a specific instant emission of radioactive compound is deflected in a magnetic field. The compound can emit : (i) electrons (ii) protons (iii) $He^{2+}$ (iv) neutrons The emission at the instant can be :

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Wires 1 and 2 carrying currents $i_1$ and $i_2$ respectively are inclined at an angle $\theta$ to each other. What is the force on a small element $dl$ of wire 2 at a distance $r$ from wire 1 (as shown in figure) due to the magnetic field of wire 1 ?

asked Dec 11, 2018 by pady_1

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A particle of mass $m$ mooves along line PC with velocity $v$ as shown. What is the angular momentum of the particle about $O$ ?

asked Dec 11, 2018 by pady_1

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One end of massless rope, which passes over a massless and frictionless pulley $P$ is tied to a hook $C$ while the other end is free. Maximum tension that the rope can bear is 360 N. With what value of maximum safe acceleration (in $ms^{-2}$) can a man of 60 kg climb on the rope ?

asked Dec 11, 2018 by pady_1

1 answer

Three identical blocks of masses $m = 2\; kg$ are drawn by a force $F=10.2 N$ with an acceleration of $0.6\;ms^{-2}$ on a frictionless surface, then what is the tension (in $N$) in the string between the blocks B and C ?

asked Dec 11, 2018 by pady_1

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Two spheres of the same material have radii $1m$ and $4m$ and temperatures $4000 K$ and $2000 K$ respectively. The ratio of the energy radiated per second by the first sphere to that by the second is :

asked Dec 11, 2018 by pady_1

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A light string passing over a smooth light pulley connects two blocks of masses $m_1$ and $m_2$ (vertically). If the acceleration of the system is $g/8$, then the ratio of the masses is :

asked Dec 11, 2018 by pady_1

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Capacitance (in F) of a spherical conductor having radius 1 m, is :

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If a charge $q$ is placed at the centre of the line joining two equal charges $Q$ such that the system is in equilibrium them the value of $q$ is :

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1 mole of a gas with $\gamma = 7/5$ is mixed with 1 mole of a gas with $\gamma = 5/3$, then the value of $\gamma$ for the resulting mixture is :

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Speeds of two identical cars are $u$ and $4u$ at a specific instant. The ratio of the respective distances at which the two cars are stopped from that instant is :

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Two forces are such that the sum of their magnitudes is 18 N and their resultant which has magnitude 12 N, is perpendicular to the smaller force. Then the magnitudes of the forces are :

asked Dec 11, 2018 by pady_1

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When forces $F_1, \; F_2, \; F_3$ are acting on particle of mass $m$ such that $F_2$ and $F_3$ are mutually perpendicular, then the particle remains stationary . If the force $F_1$ is now removed then the acceleration of the particle is :

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Moment of inertia of a circular wire of mass M and radius R about its diameter is :

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Even Carnot engine cannot give 100% efficiency because we cannot :

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In a transformer, number of turns in the primary are 140 and that in the secondary are 280. If current in primary is 4 A, then that in the secondary is :

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A solid sphere, a hollow sphere and a ring are released from top of an inclined plane (frictionless) so that they slide down the plane. Then maximum acceleration down the plane is for (no rolling ) :

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The time period of a charged particle undergoing a circulr motion in a unifrom magnetic field is independent of its :

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At what temperature is the rms velocity of a hydrogen molecule equal to that of an oxygen molecule at $47^{\circ}C$ ?

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The mass of a product liberated on anode in an electrochemical cell depends on :

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A lift is moving down with acceleration $a$. A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively :

asked Dec 11, 2018 by pady_1

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