List of top Physics Questions asked in VITEEE

A sample of HCl gas is placed in an electric field \(3\times 10^{4}\,NC^{-1}\). The dipole moment of each HCl molecule is \(6\times 10^{-30}\,Cm\). The maximum torque that can act on a molecule is
Three resistances of \(4\Omega\) each are connected as shown in figure. If the point D divides the resistance into two equal halves, the resistance between point A and D will be
The resistance of a metal increases with increasing temperature because
In the absence of applied potential, the electric current flowing through a metallic wire is zero because
A meter bridge is used to determine the resistance of an unknown wire by measuring the balance point length \(l\). If the wire is replaced by another wire of same material but double the length and half the thickness, the balancing point is expected to be
Equal amounts of a metal are converted into cylindrical wires of different lengths (\(L\)) and cross-sectional area (\(A\)). The wire with the maximum resistance is the one, which has
If the force exerted by an electric dipole on a charge \(q\) at a distance of 1 m is \(F\), the force at a point 2 m away in the same direction will be
A solid sphere of radius \(R_1\) and volume charge density \(\rho = \frac{\rho_0}{r}\) is enclosed by a hollow sphere of radius \(R_2\) with negative surface charge density \(\sigma\), such that the total charge in the system is zero. \(\rho_0\) is a positive constant and \(r\) is the distance from the centre of the sphere. The ratio \(\frac{R_2}{R_1}\) is
A solid spherical conductor of radius \(R\) has a spherical cavity of radius \(a\) (\(a<R\)) at its centre. A charge \(+Q\) is kept at the centre. The charge at the inner surface, outer surface and at a position \(r\) (\(a<r<R\)) are respectively
A cylindrical capacitor has charge \(Q\) and length \(L\). If both the charge and length of the capacitor are doubled, by keeping other parameters fixed, the energy stored in the capacitor
In Colpitt oscillator the feedback network consists of
A radio station has two channels. One is AM at 1020 kHz and the other is FM at 89.5 MHz. For good results you will use
In nature, the electric charge of any system is always equal to
The energy stored in the capacitor as shown in Fig. (a) is \(4.5\times 10^{-6}\) J. If the battery is replaced by another capacitor of 900 pF as shown in Fig. (b), then the total energy of system is
The reverse saturation current of p--n diode
The communication using optical fibers is based on the principle of
A certain radioactive material \(_x^AX\) starts emitting \(\alpha\) and \(\beta\) particles successively such that the end product is \(_{Z-3}^{A-8}\)A. The number of \(\alpha\) and \(\beta\) particles emitted are respectively
A Zener diode has a contact potential of 1V in the absence of biasing. It undergoes Zener breakdown for an electric field of \(10^6\) V/m at the depletion region of p--n junction. If the width of the depletion region is \(2.5\,\mu m\), what should be the reverse biased potential for the Zener breakdown to occur?
A p--n junction has acceptor impurity concentration of \(10^{17}\,cm^{-3}\) in the p-side and donor impurity concentration of \(10^{16}\,cm^{-3}\) in the n-side. What is the contact potential at the junction (\(T=\) thermal energy, intrinsic semiconductor concentration \(n_i = 1.4\times 10^{10}\,cm^{-3}\)) ?
When a solid with a band gap has a donor level just below its empty energy band, the solid is
In the circuit shown above, an input of 1V is fed into the inverting input of an ideal Op-amp A. The output signal \(V_{out}\) will be
The \(K_{\alpha}\) and \(K_{\beta}\) X-rays are emitted when there is a transition of electron between the levels
\(^{234}\)U has 92 protons and 234 nucleons total in its nucleus. It decays by emitting an alpha particle. After the decay it becomes
If the speed of a wave doubles as it passes from shallow water into deeper water, its wavelength will be
An electron microscope is used to probe the atomic arrangements to a resolution of 5 \AA. What should be the electric potential to which the electrons need to be accelerated?