Recent questions in Kinematics

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. The velocity of a small ball of mass \(M\) and density \(d\), when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is \(\frac{d}{2}\), then the viscous force acting on the ball will be:

asked Dec 31, 2021 in Kinematics by kritika (90.1k points)

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. Polar molecules are the molecules:

asked Dec 31, 2021 in Kinematics by kritika (90.1k points)

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For a plane electromagnetic wave propagating in \(x\)-direction, which one of the following combination gives the correct possible directions for electric field (E) and magnetic field (B) respectively?

asked Dec 31, 2021 in Kinematics by kritika (90.1k points)

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In a potentiometer circuit a cell of EMF \(1.5 \mathrm{~V}\) gives balance point at \(36 \mathrm{~cm}\) length of wire. If another cell of EMF \(2.5 \mathrm{~V}\) replaces the first cell, then at what length of the wire, the balance point occurs ?

asked Dec 31, 2021 in Kinematics by kritika (90.1k points)

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A particle is released from height \(S\) from the surface of the Earth. At a certain height its kinetic energy is three times its potential energy. The height from the surface of earth and the speed of the particle at that instant are respectively:

asked Dec 31, 2021 in Kinematics by kritika (90.1k points)

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A small block slides down on a smooth inclined plane, starting from rest at time \(t=0\). Let \(S_{n}\) be the distance travelled by the block in the interval \(t=n-1\) to \(t=n\). Then, the ratio \(\frac{S_{n}}{S_{n+1}}\) is :

asked Dec 31, 2021 in Kinematics by kritika (90.1k points)

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Q7. A capacitor of capacitance \({ }^{\prime} C^{\prime}\), is connected across an ac source of voltage \(V\), given by \(V=V_{0} \sin \omega t\) The displacement current between the plates of the capacitor, would then be given by: (A) \(I_{d}=V_{0} \omega C \cos \omega t\) B \(I_{d}=\frac{V_{0}}{\Delta C} \cos \omega t\) c) \(I_{d}=\frac{V_{0}}{\omega} \sin \omega t\) D \(I_{d}=V_{0} \omega C \sin \omega t\)

asked Dec 31, 2021 in Kinematics by kritika (90.1k points)

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A convex lens' \(A^{\prime}\) 'of focal length \(20 \mathrm{~cm}\) and a concave lens' \(B\) ' of focal length \(5 \mathrm{~cm}\) are kept along the same axis with a distance ' \(d\) ' between them. If a paralle beam of light falling on' \(A^{\prime}\) leaves ' \(B\) ' as a parallel beam, then the cistance ' \(d\) ' in cm will be:

asked Dec 31, 2021 in Kinematics by kritika (90.1k points)

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The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be :

asked Dec 31, 2021 in Kinematics by kritika (90.1k points)

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The escape velocity from the Earth's surface is \(v\). The escape velocity from the surface of another planet having a radius, four times that of Earth and same mass density is :

asked Dec 31, 2021 in Kinematics by kritika (90.1k points)

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A raclioactive nucleus \({ }_{Z}^{A} X\) undergoes spontaneous decay in the sequence \({ }_{Z}^{A} X \rightarrow_{z-1} B \rightarrow_{Z-3} C \rightarrow_{Z-2} D\), where \(Z\) is the atomic number of element \(X\). The possible decay particles in the sequence are :

asked Dec 31, 2021 in Kinematics by kritika (90.1k points)

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. A body is executing simple harmonic motion with frequency 'n', the frequency of its potential energy is:

asked Dec 31, 2021 in Kinematics by kritika (90.1k points)

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Q. A plane mirror produces a magnification of

asked Dec 30, 2021 in Kinematics by kritika (90.1k points)

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. A capillary tube of radius \(r\) is immersed in water and water rises in it to a height \(h\). The mass of the water in the capillary is \(5 g\). Another capillary tube of radius \(2 r\) is immersed in water. Themass of water that will rise in this tube is :

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

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Taking into account of the significant figures, what is the value of \(9.99 m-0.0099 m\) ?

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

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An electron is accelerated from rest through a potential difference of \(\mathrm{V}\) volt. If the de Broglie wavelength of the electron is \(1.227 \times 10^{-2} n m\), the potential difference is :

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

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The quantities of heat required to raise the temperature of two solid copper spheres of radii \(r_{1}\) and \(r_{2}\left(r_{1}=1.5 r_{2}\right)\) through \(1 \mathrm{~K}\) are in the ratio :

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

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A charged particle having drift velocity of \(7.5 \times 10^{-4} \mathrm{~m} \mathrm{~s}^{-1}\) in an electric field of \(3 \times 10^{-10} \mathrm{Vm}^{-1}\), has a mobility in \(m^{2} V^{-1} \mathrm{~s}^{-1}\) of:

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

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A long solenoid of \(50 \mathrm{~cm}\) length having 100 turns carries a current of \(2.5 A\). The magnetic field at the centre of the solenoid is : \(\left(\mu_{o}=4 \pi \times 10^{-7} T m A^{-1}\right)\)

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

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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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