List of top Physics Questions

The dominant mode for rectangular waveguide is:
Radio waves in the frequency range 3 MHz – 30 MHz propagate through which mode of propagation?
What is the major factor for determining whether a medium is free space, lossless dielectric, loss of dielectric or good conductor?
The work done by the force \( \mathbf{F} = (4\hat{i} -3\hat{j} + 2\hat{k}) \) N in giving a 1 nC charge a displacement of \( (10\hat{i} + 2\hat{j} -7\hat{k}) \) m is:
The divergence of the vector field \( \mathbf{P} = x^2 y \hat{i} + xyj \) is:
The correct equivalent symbol for the AND gate with inverted inputs shown below will be:
equivalent symbol for the AND
If the peak rectified voltage from a full-wave rectifier is 15V, the approximate average rectified voltage will be:
A certain transistor is to be operated with \( V_{CE} = 6V \). If its maximum power rating is 250 mW, what is the maximum collector current that it can handle?
A certain JFET has transconductance 4mS with an external AC drain resistance 1.5kΩ, what is the ideal voltage gain?
The circuit shown is used for:
Integration
Which of the following is not correct about Pauli spin matrices?
Number of bound states for the system \( V(x) = -V_0 \delta(x-a), V_0>0 \) is:
The de-Broglie wavelength of a 10 KeV electron is equal to:
The value of \( \frac{1}{r} \) in the \( \psi_{1,0,0}(r,\theta,\phi) \) state of a hydrogen atom is (\( a_0 \) is Bohr radius):
The eigenvalues of the operator \( \sin \left( a \frac{\partial}{\partial \theta} \right) \) corresponding to the eigenfunction \( \psi_{3,2,-2}(r,\theta,\phi) \) are:
The depletion region in a semiconductor is created by:
Which one of the following is \textit{not a linear operator?}
An electron is confined to a box of length \( L \). If the length of the box changes to \( 2L \), how would the uncertainty of momentum of the electron change?
The distance between the Sun and the Earth is 1 astronomical unit (1 AU). Jupiter takes about 11.9 Earth years to orbit around the Sun. The distance between the Sun and Jupiter, in AU, is about:
The Lagrangian of a simple pendulum, consisting of a bob of mass \( m \) suspended by a string of length \( l \), executing oscillations of amplitude \( \theta \) about the equilibrium position is given by:
Two identical atoms of mass \( m \) are bound to each other by the Lennard-Jones potential,
\[ V = \varepsilon \left[ \left( \frac{r_0}{r} \right)^{12} - 2 \left( \frac{r_0}{r} \right)^6 \right] \] The frequency of small oscillations about the equilibrium is:
The types of constraints on the mechanical system consisting of a cylinder rolling (and possibly sliding) down an inclined plane of angle \( \alpha \) are:
The moment of inertia of a solid circular cylinder of radius \( a \) and height \( h \) about its axis is:
For inverse square law forces, the mathematical statement of the virial theorem is (where \( \langle T \rangle \) and \( \langle V \rangle \) are the averages of kinetic and potential energies):
The magnitude of Coriolis acceleration (expressed in terms of \( g \), the acceleration due to Earth's gravity) for a particle of mass \( m \) moving with a velocity \( 10^4 \) cm/s horizontally along Earth's surface at the North Pole is about: