Recent questions tagged jee(main)-2020-(2sep-shift2)

A charge Q is distributed over two concentric conducting thin spherical shells radii r and R (R > r). If the surface charge densities on the two shells are equal, the electric potential at the common centre is : (1) ${1\over4\pi\epsilon_0}{(2R+r)\over(R^2+r...

In the following, digital circuit, what will be the output a 'Z', when the input (A,B) are (1,0), (0,0), (1,1), (0,1) (1) 1,1,0,1 (2) 0,1,0,0 (3) 1,0,1,1 (4) 0,0,1,0

The displacement time graph of a particle executing SHM is given in figure : (sketch is schematic and not to scale) Which of the following statements is/are true for this motion ? (A) The force is zero at t = $3T\over4$ (B) The acceleration is maximum at t ...

A potentiometer wire PQ of 1m length is connected to a standard cell E1. Another cell E2 of emf 1.02 V is connected with a resistance 'r' and switch S (as shown in figure). With switch S open, the null position is obtained at a distance of 49 cm from Q. The...

The figure shows a region of length '$\ell$' with a uniform magnetic field of 0.3 T in it and a proton entering the region with velocity 4 105 ms-1 making an angle 60º with the field. If the proton completes 10 revolution by the time it cross the region ...

For the disproportionation reaction 2Cu+(aq) $\rightleftharpoons$ Cu(s) + Cu2+(aq) at 298 K, In K (where K is the equilibrium constant) is________ 10-1. Given $\left(E_{Cu^{2+}/Cu^+}^o=0.16V,\ E_{Cu^+/Cu}^o=0.52V,\ {RT\over F}=0.025\right)$ Numerical ...

Simplified absorption spectra of three complexes ((i) and (ii) and (iii)) of M+n ion are provided below; their λmax values are marked as A, B and C respectively. The correct match between the complexes and their λmax values is: (i) [M(NCS)6](-6 + n) (ii) [...

The correct observation in the following reaction is: $\require{mhchem}\ce{Sucrose->[\text{Gly cosidic bond}][\text{Cleavage (Hydrolysis)}]A + B->[\text{Seliw anoff}][\text{Reagent}]?}$ (1) Formation of blue colour (2) Formation of violet colour (3) ...

Arrange the following labelled hydrogens in decreasing order of acidity: (1) b > c > d > a (2) c > b > a > d (3) b > a > c > d (4) c > b > d > a

Consider the reaction sequence given below : Which of the following statements is true: (1) Changing the concentration of base will have no effect on reaction (1) (2) Doubling the concentration of base will double the rate of both the reactions (3) Changing...

The major product of the following reaction is:

The results given in the below table were obtained during kinetic studies of the following reaction : 2A + B → C + D Experiment [A] / molL-1 [B] / molL-1 Initial rate / molL-1 min-1 I 0.1 0.1 6.00 10-3 II 0.1 0.2 2.40 10-2 III 0.2 0.1 1.20 10-2 IV X 0.2 7....

The major product obtained from E2-elimination of 3-bromo-2-fluoropentane is

Match the type of interaction in column A with the distance dependence of their interaction energy in column B : A B (i) ion - ion (a) $1\over r$ (ii) Dipole - dipole (b) $1\over r^2$ (iii) Londondispersion (c) $1\over r^3$ (d) $1\over r^6$ (1) (i) - (a); (...

Two compounds A and B with same molecular formula (C3H6O) undergo Grignard reaction with methylmagnesium bromide to give products C and D. Products C and D show following chemical tests. Test C D Ceric ammonium nitrate Test Positive Positive Lucas Test ...

An organic compound 'A' (C9H10O) when treated with conc. HI undergoes cleavage to yield compound 'B' and 'C'. 'B' gives yellow precipitate with AgNO3 where as 'C' tautomerizes to 'D'. 'D' gives positive iodoform test. 'A' could be:

$\lim\limits_{x\to0}\left(\tan\left({\pi\over4}+x\right)\right)^{1/x}$ is equal to (1) 2 (2) 1 (3) e (4) e2

The equation of the normal to the curve y = (1 + x)2y + cos2(sin–1x) at x = 0 is : (1) y = 4x + 2 (2) y + 4x = 2 (3) x + 4y = 8 (4) 2y + x = 4

The imaginary part of $(3+2\sqrt{-54})^{1\over2}-(3-2\sqrt{-54})^{1\over2}$ can be (1) $\sqrt{-6}$ (2) $\sqrt{6}$ (3) $-2\sqrt{6}$ (4) 6

Let S be the sum of the first 9 term of the series : {x + ka} + {x2 + (k + 2)a} + {x3 + (k + 4)a} + {x4 + (k + 6)a} + ........ where a ≠ 0 and x ≠ 1. If $S={x^{10}-x+45a(x-1)10\over x-1}$, then k is equal to (1) –3 (2) 1 (3) –5 (4) 3

An ideal cell of emf 10V is connected in circuit shown in figure. Each resistance is 2Ω. The potential difference (in V) across the capacitor when it is fully charged is _____________ Numerical Value Type

A light ray enters a solid glass sphere of refractive index m = µ = $\sqrt3$ at an angle of incidence 60°. The ray is both reflected and refracted at the farther surface of the sphere. The angle (in degrees) between the reflected and refracted rays at this ...

A wire of density 9 10-3 kg cm-3 is stretched between two clamps 1 m apart. The resulting strain in the wire is 4.9 10-4. The lowest frequency of the transverse vibrations in the wire (Young's modulus of wire Y = 9 1010 Nm-2), (to the nearest integer)...

An inductance coil has a reactance of 100Ω. When an AC signal of frequency 1000 Hz is applied to the coil, the applied voltage leads the current by 45°. The self-inductance of the coil is : (1) 5.5 × 10–5 H (2) 1.1 × 10–2 H (3) 6.7 × 10–7 H (4) 1.1 × 10–1 H

A 10µF capacitor is fully to a potential difference of 50 V. After removing the source voltage it is connected to an uncharged capacitor in parallel. Now the potential difference across them becomes 20 V. The capacitance of the second capacitor is : (1) ...

A particle is moving 5 times as fast as an electron. The ratio of the de-Broglie wavelength of the particle to that of the electron is 1.878 10-4. The mass of the particle is close to : (1) 1.2 10-28 kg (2) 9.7 10-28 kg (3) 9.1 10-31 kg (4) 4.8 10...

An ideal gas in a closed container is slowly heated. As its temperature increases, which of the following statements are true ? (A) the mean free path of the molecules decreases (B) the mean collision time between the molecules decreases. (C) the mean free ...

In momentum (P), area (A) and time (T) are taken to be the fundamental quantities then the dimensional formula for energy is : (1) [P2AT–2] (2) [P–1AT–1] (3) [PA1/2T–1] (4) [PA–1T–2]

In a Young's double slit experiment, 16 fringes are observed in a certain segment of the screen when light of wavelength 700 nm is used. If the wavelength of light is changed to 400 nm, the number of fringes observed in the same segment of the screen would ...

In a hydrogen atom the electron makes a transition from (n + 1)th level to the nth level. If n >> 1, the frequency of radiation emitted is proportional to : (1) $1\over n^4$ (2) $1\over n$ (3) $1\over n^3$ (4) $1\over n^2$