Recent questions tagged neet

Two similar thin equi-convex lenses, of focal length f each, are kept coaxially in contact with each other such that the focal length of the combination is $F_1$.When the space between the two lenses is filled with glycerin (which has the same refractive index $(\mu = 1.5)$ as that of glass) then the equivalent focal length is $F_2$. The ratio $F_1 : F_2$ will be :

asked Jul 8, 2019 by pady_1

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Two particles A and B are moving in uniform circular motion in concentric circles of radius rA and rB with speed uA and uB respectively. The time period of roation is the same. The ratio of angular speed of A to that of B will be :

asked Jul 8, 2019 by pady_1

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Pick the wrong answer in the context with rainbow.

asked Jul 8, 2019 by pady_1

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A force $F = 20 + 10y$ acts on a particle in y-direction where F is in newton and y in meter. Work done by this force to move the particle from $y = 0$ to $y = 1;m$ is :

asked Jul 8, 2019 by pady_1

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At a point A on the earth's surface the angle of dip, $\delta = +25^{\circ}$. At a point B on the earth's surface the angle of dip, $\delta =-25^{\circ}$. We can interpret that.

asked Jul 8, 2019 by pady_1

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Six similar bulbs are connected as shown in the figure with a DC source of emf E, and zero internal resistance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one from section B are glowing, will be :

asked Jul 8, 2019 by pady_1

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In which of the following devices, the eddy current effect is not used ?

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A hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre :

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The radius of circle the period of revolution initial position and sense of revolution are indicated in the fig

y-projection of the radius vector of rotating particle P is:

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A solid cylinder of mass 2 kg and radius 4 cm is rotating about its axis at the rate of 3 rpm. The torque required to stop after $2\pi$ revolutions is :

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Which colour of the light has the longest wavelength ?

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A body weighs 200 N on the surface of the earth.How much will it weigh half way down to the centre of the earth ?

asked Jul 8, 2019 by pady_1

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In an experiment, the percentage of error occurred in the measurment of physical quantities A, B, C and D are 1%, 2%, 3% and 4% respectively. Then the maximum percentage of error in the measurement X, where $X=\frac{A^2B^\frac{1}{2}}{C^\frac{1}{3}D^3}$, will be

asked Jul 8, 2019 by pady_1

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A disc of radius 2m and mass 100 kg rolls on a horizontal floor.Its center of mass has speed of $20\frac{cm}{s}$.How much work is needed to stop it?

asked Jul 8, 2019 by pady_1

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When a block of mass M is suspended by a long wire of length L, the length of the wire become (L+l).The elastic potential energy stored in the extended wire is

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The unit of thermal conductivity is

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A copper rod of 88 cm and an aluminum rod of unknown length have their increase in length independent of increase in temperature. The length of aluminum rod is : ($\propto Cu=1.7\times10^{-5}K^{-1}and \propto Al=2.2\times 10^{-5}K^{-1}$)

asked Jul 8, 2019 by pady_1

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A soap bubble, having radius of 1 mm, is blown from a detergent solution having a surface tension of $2.5 \times 10^{-2}$ $\frac{ N}{m}$. The pressure inside the bubble equals at a point $Z_0$ below the free surface of water in a container. Taking $g = 10 \frac{m}{s^2} $ density of water $= 103\frac{ kg}{m^3}$, the value of $Z_0$ is :-

asked Jul 8, 2019 by pady_1

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Average velocity of a particle executing SHM in one complete vibration is :

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A 800 turn coil of effective area $0.05 m^2$ is kept perpendicular to a magnetic field $5\times 10^{5}$ T. When the plane of the coil is rotated by 90° around any of its coplanar axis in 0.1 s, the emf induced in the coil will be :

asked Jul 8, 2019 by pady_1

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The displacement of a particle executing simple harmonic motion is given by $y = A0 + Asin{\omega}{t}+ Bcos\omega{t}$. Then the amplitude of its oscillation is given by :

asked Jul 8, 2019 by pady_1

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A mass m is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break when:

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The speed of a swimmer in still water is $20\frac{ m}{s}$. The speed of river water is $10 \frac{m}{s}$ and is flowing due east. If he is standing on the south bank and wishes to cross the river along the shortest path, the angle at which he should make his strokes w.r.t. north is given by :

asked Jul 8, 2019 by pady_1

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Body A of mass 4m moving with speed u collides with another body B of mass 2m, at rest. The collision is head on and elastic in nature. After the collision the fraction of energy lost by the colliding body A is :

asked Jul 8, 2019 by pady_1

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A block of mass 10 kg is in contact against the inner wall of a hollow cylindrical drum of radius 1 m. The coefficient of friction between the block and the inner wall of the cylinder is 0.1. The minimum angular velocity needed for the cylinder to keep the block stationary when the cylinder is vertical and rotating about its axis, will be :$(g = 10\frac{m}{s^2})$

asked Jul 8, 2019 by pady_1

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The correct Boolean operation represented by the circuit diagram drawn is

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The total energy of an electron in an atom in an orbit is -3.4 eV. Its kinetic and potential energies are, respectively :

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Increase in temperature of a gas filled in a container would lead to :

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In which of the following processes, heat is neither absorbed nor released by a system ?

asked Jul 8, 2019 by pady_1

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The method used to remove temporary hardness of water is :

asked Jul 8, 2019 by pady_1

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What is the correct electronic configuration of the central atom in $K_4[Fe(CN)_6]$ based on crystal field theory?

asked Jul 8, 2019 by pady_1

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For the chemical reaction $N_2(g)+3H_2(g)\rightleftharpoons 2NH_3(g)$ the correct option is :

asked Jul 8, 2019 by pady_1

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The major product of the following reaction is :

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Among the following, the reaction that proceeds through an electrophilic substitution is :

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A gas at 350 K and 15 bar has molar volume 20 percent smaller than that for an ideal gas under the same conditions. The correct option about the gas and its compressibility factor (Z) is :

asked Jul 8, 2019 by pady_1

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The non-essential amino acid among the following is :

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Which of the following is incorrect statement ?

asked Jul 8, 2019 by pady_1

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Match the following (a)Pure nitrogen (i) Chlorine (b) Haber process (ii) Sulphuric acid (c) Contact process (iii) Ammonia (d) Deacon's process (iv) Sodium azide or Barium azid Which of the following is the correct option ? (a) (b) (c) (d) (1) (i) (ii) (iii) (iv) (2) (ii) (iv) (i) (iii) (3) (iii) (iv) (ii) (i) (4) (iv) (iii) (ii) (i)

asked Jul 8, 2019 by pady_1

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In which case change in entropy is negative ?

asked Jul 8, 2019 by pady_1

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For the cell reaction $2Fe^{3+}(aq)+2I^{-}(aq)\rightarrow2Fe^{2+}(aq)+I_2(aq)$ $E^{\ominus}_{cell}$ cell E 0.24V at 298 K. The standard Gibbs energy $(\triangle^{\circ}_{r}G^{\ominus})$of the cell reaction is : [Given that Faraday constant $F = 96500 C \;mol^{-1}$

asked Jul 8, 2019 by pady_1

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The mixture that forms maximum boiling azeotrope is :

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Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region ?

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Which one is malachite from the following ?

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Enzymes that utilize ATP in phosphate transfer require an alkaline earth metal (M) as the cofactor.M is :

asked Jul 8, 2019 by pady_1

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An alkene "A" on reaction with $O_3$ and $Zn-H_2O$ gives propanone and ethanal in equimolar ratio.Addition of HCl to alkene "A" gives "B" as the major product. The structure of product "B" is :-

asked Jul 8, 2019 by pady_1

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Which is the correct thermal stability order for$H_2E$ (E=O, S, Se, Te and Po) ?

asked Jul 8, 2019 by pady_1

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Match the Xenon compounds in Coloumn - I with its structure in Column - II and assigning the correct code:

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The biodegradable polymer is :-

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4d, 5d, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is :-

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Identify the incorrect statement related to $PCl_5$ from the following :-

asked Jul 8, 2019 by pady_1

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