Questions by kritika

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. A nucleus with mass number 240 breaks into two a fragments each of mass number 120 , the binding energy per nucleon of unfragmented nuclei is \(7.6 \mathrm{MeV}\) while that of fragments is \(8.5 \mathrm{MeV}\). The total gain in the Binding Energy in the process is :

asked Dec 31, 2021 in Kinematics

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The electron concentration in an \(n\)-type semiconductor is the same as hole concentration in a \(p\)-type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them.

asked Dec 31, 2021 in Kinematics

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A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since:

asked Dec 31, 2021 in Kinematics

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Water falls from a height of \(60 \mathrm{~m}\) at the rate of \(15 \mathrm{~kg} / \mathrm{s}\) to operate a turbine. The losses due to frictional force are \(10 \%\) of the input energy. How much power is generated by the turbine? \(\left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right)\)

asked Dec 31, 2021 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

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. Polar molecules are the molecules:

asked Dec 31, 2021 in Kinematics

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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Q. Synergids are

asked Dec 31, 2021 in Biology

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Q. Vegetative propagation in Pistia occurs by

asked Dec 31, 2021 in Biology

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Q. Pick the odd one out:

asked Dec 31, 2021 in Biology

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Q. In meiosis crossing over is initiated at:

asked Dec 31, 2021 in Biology

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