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The maximum number of electrons in an atom in which the last electron filled has the quantum numbers \(n=3, I=2\) and \(m=-1\) is

asked Dec 11, 2021 in Some basic concepts in chemistry by kritika (90.1k points)

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For the following carbocations the correct order of stability is

asked Dec 11, 2021 in Some basic concepts in chemistry by kritika (90.1k points)

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A charged particle moves with constant velocity in a region where no effect of gravity is felt but an electrostatic field \(\vec{E}\) together with a magnetic field \(\vec{B}\) may be present. Then which of the following cases are possible ?

asked Dec 11, 2021 in Kinematics by kritika (90.1k points)

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A \(400 \Omega\) resistor, a \(250 \mathrm{mH}\) inductor and a \(2.5 \mu \mathrm{F}\) capacitor are connected in series with an \(\mathrm{AC}\) source of peak voltage \(5 \mathrm{~V}\) and angular frequency \(2 \mathrm{kHz}\). What is the peak value of the electrostatic energy of the capacitor?

asked Dec 11, 2021 in Kinematics by kritika (90.1k points)

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A simple pendulum of length \(\ell\) is displaced so that its taught string is horizontal and then released. A uniform bar pivoted at one end is simultaneously released from its horizontal position. If their motions are synchronous, what is the length of the bar?

asked Dec 11, 2021 in Kinematics by kritika (90.1k points)

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Two metallic spheres of equal outer radii are found to have same moment of inertia about their respective diameters. Then which of the following statement(s) is/are true ?

asked Dec 11, 2021 in Kinematics by kritika (90.1k points)

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A point source of light is used in an experiment of photo-electric effects. If the distance between the source and the }{ photo-electric surface is doubled, which of the following may result? }

asked Dec 11, 2021 in Kinematics by kritika (90.1k points)

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Two pith balls, each carrying charge \(+q\) are hung from a hook by two strings. It is found that when each charge is tripled, angle between the strings double. What was the initial angle between the strings ?

asked Dec 11, 2021 in Kinematics by kritika (90.1k points)

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Consider an engine that absorbs 130 cal of heat from a hot reservoir and delivers 30 cal heat to a cold reservoir in each cycle. The engine also consumes \(2 \mathrm{~J}\) energy in each cycle to overcome friction. If the engine works at 90 cycles per minute, what will be the maximum power delivered to the load? [Assume the thermal equivalent of heat is \(4.2 \mathrm{~J} / \mathrm{cal}\) ]

asked Dec 11, 2021 in Kinematics by kritika (90.1k points)

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A pair of parallel metal plates are kept with a separation ' \(\mathrm{d}\) '. One plate is at a potential \(+\mathrm{V}\) and the other is at ground potential. A narrow beam of electrons enters the space between the plates with a velocity \(v_{0}\) and in a direction parallel to the plates. What will be the angle of the beam with the plates after it travels an axial distance L?

asked Dec 11, 2021 in Magnetic effects of by kritika (90.1k points)

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A conducting circular loop of resistance \(20 \Omega\) and cross-sectional area \(20 \times 10^{-2} \mathrm{~m}^{2}\) is placed perpendicular to a spatially uniform magnetic field \(B\), which varies with time \(t\) as \(B=2 \sin (50 \pi t) T\). Find the net charge flowing through the loop in \(20 \mathrm{~ms}\) starting from \(\mathrm{t}=0\)

asked Dec 11, 2021 in Magnetic effects of by kritika (90.1k points)

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A thin convex lens is placed just above an empty vessel of depth \(80 \mathrm{~cm}\). The image of a coin kept at the bottom of the vessel is thus formed \(20 \mathrm{~cm}\) above the lens. If now water is poured in the vessel up to a height of \(64 \mathrm{~cm}\), what will be the approximate new position of the image. Assume that refractive index of water is \(4 / 3 .\)

asked Dec 11, 2021 in Kinematics by kritika (90.1k points)

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An object is placed \(60 \mathrm{~cm}\) in front of a convex mirror of focal length \(30 \mathrm{~cm}\). A plane mirror is now placed facing the object in between the object and the convex mirror such that it covers lower half of the convex mirror. What should be the distance of the plane mirror from the object so that there will be no parallax between the images formed by the two mirrors?

asked Dec 11, 2021 in Kinematics by kritika (90.1k points)

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Consider a conducting wire of length \(L\) bent in the form of a circle of radius \(R\) and another conductor of length 'a' (a \(<<\mathrm{R})\) is bent in the form of a square. The two loops are then placed in same plane such that the square loop is exactly at the centre of the circular loop. What will be the mutual inductance between the two loops?

asked Dec 11, 2021 in Kinematics by kritika (90.1k points)

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A galvanometer can be converted to a voltmeter of full-scale deflection \(V_{0}\) by connecting a series resistance \(R_{1}\) and can be converted to an ammeter of full-scale deflection \(I_{0}\) by connecting a shunt resistance \(R_{2}\). What is the current flowing through the galvanometer at its full-scale deflection ?

asked Dec 11, 2021 in Kinematics by kritika (90.1k points)

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A very long charged solid cylinder of radius 'a' contains a uniform charge density \(\rho\). Dielectric constant of the material of the cylinder is \(\mathrm{k}\). What will be the magnitude of electric field at a radial distance ' \(\mathrm{x}\) ' \((\mathrm{x}<\mathrm{a})\) from the axis of the cylinder?

asked Dec 11, 2021 in Kinematics by kritika (90.1k points)

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Four identical point masses, each of mass \(m\) and carrying charge \(+q\) are placed at the corners of a square of sides 'a' on a frictionless plain surface. If the particles are released simultaneously, the kinetic energy of the system when they are infinitely far apart is

asked Dec 11, 2021 in Kinematics by kritika (90.1k points)

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The bob of a swinging seconds pendulum (one whose time period is \(2 \mathrm{~s}\) ) has a small speed \(\mathrm{v}_{0}\) at its lowest point. Its height from this lowest point \(2.25 \mathrm{~s}\) after passing through it is given by

asked Dec 11, 2021 in Kinematics by kritika (90.1k points)

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A tennis ball hits the floor with a speed \(v\) at an angle \(\theta\) with the normal to the floor. If the collision is inelastic and the co-efficient of restitution is \(\varepsilon\), what will be the angle of reflection ?

asked Dec 11, 2021 in Kinematics by kritika (90.1k points)

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A block of mass \(m\) rests on a horizontal table with a co-efficient of static friction \(\mu\). What minimum force must be applied on the block to drag it on the table ?

asked Dec 11, 2021 in Laws of motion by kritika (90.1k points)

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