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Practice Online Test Series for JEE Main 2018 & NEET 2018
The Boolean expression for the given circuit is
A particle of mass 10 g is kept on the surface of a uniform sphere of mass 100 kg and radius 10 cm. Find the work to be done against the gravitational force between them, to take the particle far way from the sphere. (Take `G = 6.67×10^(–11) Nm^2 kg^(–2)`)
An open organ pipe has a length of 5 cm. The highest harmonic of such a tube that is in the audible range (20 Hz – 20000 Hz) is (speed of sound in air is 340 m`s^(–1)`)
A 6 volt battery is connected to the terminals of a three metre long wire of uniform thickness and resistance of 100`Omega` . The difference of potential between two points on the wire separated by a distance of 50 cm will be
A source is moving towards stationary observer with some velocity. The frequency of sound heard is `4/3` of its original frequency. Then, the velocity of source is :– (Given velocity of sound is 332 m`s^(–1)`)
A solid cylinder of mass 2 kg rolls down an inlcined plane from a height of 4m. Its rotational kinetic energy when it reaches the foot of the plane is (g = 10 m`s^(–2)`)
The moment of inertia of a thin uniform circular disc about one of its diameters is I. The moment of inertia about an axis perpendicular to the circular surface and passing through its centre is
A solid cylinder R is free to rotate about its axis which is horizontal. A string is wound around it an mass m is attached to in free end. When m falls through a distance h, its speed at that instant is proportional to
Select the outputs Y of the combination of gates shosn below for inputs A = 1, B = 0; A = 1, B = 1 and A = 0, B = 0 respectively
In a PNP transistor working as a common-base amplifier, current gain is 0.96 and emitter current is 7.2 mA. The base current is
Which of the following statements is not true —
A liquid of refractive index 1.33 is placed between two identical plano-convex lenses, with refractive index 1.50. Two possible arrangements, P and Q, are shown. The system is
A thin sheet of glass (μ = 1.5) of thickness 6 microns introduced in the path of one of interfering beams of a double slit experiment shifts the central fringes to a position previously occupied by fifth bright frigne. Then the wavelength of the light used is
Two plane mirrors A and B are aligned parallel to each other as shown in figure. A light ray is incident at an angle of 30° at a point just inside one end of A. The plane incidence coincides withthe plane of the figure. The maximum numbe rof times the ray undergoes reflections (including the first one) before it energes out is
The radius of curvature of a thin plano-convex lens is 10 cm and the refractive index is 1.5. If the plane surface is silvered, then the focal length will be
In an ac circuit an alternating voltage `e = 200sqrt2` sin100 t V is connected to a capacitor of capacity `1mu`F.The rms value of the current in the circuit is
The electron in the hydrogen atom jumps from excited state ( n = 3 ) to its ground state ( n = 1) and the photons thus emitted irradiate a photosensitive material. If the work function of the material is 5.1 eV, the stopping potential is estimated to be (the energy of the electron in `n^(th)` state `E_n=-13.6/n^2eV`)
In Young’s experiment performed with white light, separation between the slits is ‘d’ and the screen is at a distance D>>d from the slits.At a point on the screen directly in front of one of the slits, some of the missing wavelengths are
In figure, AB is a wire of length 100 cm whose resistance is `5 Omega` .If galvanometer reads zero, the current flowing in the wire AB is
Two spheres of the same material have radii 1 m and 4 m 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
