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An iron rod of susceptibility 599 is subjected to a magnetising field of \(1200 \mathrm{~A} m^{-1}\). The permeability of the material of the rod is :

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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A short electric dipole has a dipole moment of \(16 \times 10^{-9} \mathrm{C} m\). The electric potential due to the dipole at a point at a distance of \(0.6 m\) from the centre of the dipole, situated on a line making an angle of \(60^{\circ}\) with the dipole axis is :

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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A series LCR circuit is connected to an ac voltage source. When \(L\) is removed from the circuit, the phase difference between current and voltage is \(\frac{\pi}{3}\). If instead \(C\) is removed from the circuit, the phase difference is again \(\frac{\pi}{3}\) between current and voltage. The power factor of the circuit is :

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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Assume that light of wavelength \(600 \mathrm{~nm}\) is coming from a star. The limit of resolution of telescope whose objective has a diameter of \(2 m\) is :

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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Dimensions of stress are

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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The capacitance of a parallel plate capacitor with air as medium is \(6 \mu F\). With the introduction of a dielectric medium, the capacitance becomes \(30 \mu F\). The permittivity of the medium is : \(\left(\epsilon_{0}=8.85 \times 10^{-12} C^{2} N^{-1} m^{-2}\right)\)

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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In Young's double slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes:

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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The average thermal energy for a mono-atomic gas is : ( \(k_{B}\) is Boltzmann constant and \(\mathrm{T}\), absolute temperature)

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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. A wire of length L, area of cross section \(A\) is hanging from a fixed support. The length of the wire changes to \(L_{1}\) when mass \(M\) is suspended from its free end. The expression for Young's modulus is:

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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The energy required to break one bond in DNA is \(10^{-20} J\). This value in eV is nearly

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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. When a uranium isotope \(_{9}^{235} 2 U\) is bombarded with a neutron, it generates \({ }_{36}^{89} K r\), three neutrons and :

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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Light of frequency \(1.5\) times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled?

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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The mean free path for a gas, with molecular diameter \(d\) and number density \(n\) can be expressed as :

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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A \(40 \mu F\) capacitor is connected to a \(200 \mathrm{~V}, 50 \mathrm{~Hz}\) ac supply. The rms value of the current in the circuit is, nearly :

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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The increase in the width of the depletion region in a p-n junction diode is due to:

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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. In a certain region of space with volume \(0.2 \mathrm{~m}^{3}\), the electric potential is found to be \(5 \mathrm{~V}\) throughout. The magnitude of electric field in this region is:

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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A spherical conductor of radius \(10 \mathrm{~cm}\) has a charge of \(3.2 \times 10^{-7} \mathrm{C}\) distributed uniformly. What is the magnitude of electric field at a point \(15 \mathrm{~cm}\) from the centre of the sphere ? \(\left(\frac{1}{4 \pi \epsilon_{o}}=9 \times 10^{9} \mathrm{Nm}^{2} / C^{2}\right)\)

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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Light with an average flux of \(20 \Omega / \mathrm{cm}^{2}\) falls on a non-reflecting surface at normal incidence having surface area \(20 \mathrm{~cm}^{2}\). The energy received by the surface during time span of \(1 \mathrm{minute}\) is :

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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Find the torque about the origin when a force of \(3 \hat{j} N\) acts on a particle whose position vector is \(2 \hat{k} m\).

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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A screw gauge has least count of \(0.01 \mathrm{~mm}\) and there are 50 divisions in its circular scale. The pitch of the screw gauge is:

asked Dec 29, 2021 in Kinematics by kritika (90.1k points)

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