List of top Physics Questions

Given below are two statements: Assertion (A): In a pure inductive AC circuit, current lags voltage by \(90^\circ\). Reason (R): An inductor opposes the change in current flowing through it. Choose the correct answer from the options given below:
Two capacitors of capacitances \(6\,\mu F\) and \(3\,\mu F\) are connected in series across a battery. The equivalent capacitance of the combination is
In a semiconductor, the conductivity increases with increase in temperature because
According to Bohr's atomic model, the angular momentum of an electron in the \(n^{\text{th}}\) orbit is
A photon has energy \(6\,\text{eV}\). The corresponding work function of a metal is \(2\,\text{eV}\). The maximum kinetic energy of the emitted photoelectron is
Two coils have mutual inductance \(0.5\,\text{H}\). If the current in the primary coil changes at the rate of \(4\,\text{A s}^{-1}\), the induced emf in the secondary coil is
A long straight conductor carries a current of \(10\,\text{A}\). The magnetic field at a point \(20\,\text{cm}\) away from the conductor is \((\mu_0=4\pi\times10^{-7}\,\text{TmA}^{-1})\)
An object is placed \(30\,\text{cm}\) in front of a concave mirror of focal length \(20\,\text{cm}\). The image distance is
In an AC circuit containing a pure resistor, the phase difference between voltage and current is
A galvanometer of resistance \(50\,\Omega\) gives full-scale deflection when a current of \(2\,\text{mA}\) passes through it. The value of shunt resistance required to convert it into an ammeter of range \(2\,\text{A}\) is
Two capacitors of capacitances \(6\,\mu F\) and \(3\,\mu F\) are connected in series across a battery. The equivalent capacitance of the combination is
In a semiconductor, the conductivity increases with increase in temperature because
An object is placed \(30\,\text{cm}\) in front of a concave mirror of focal length \(20\,\text{cm}\). The image distance is
A long straight conductor carries a current of \(10\,\text{A}\). The magnetic field at a point \(20\,\text{cm}\) away from the conductor is \((\mu_0=4\pi\times10^{-7}\,\text{TmA}^{-1})\)
Two coils have mutual inductance \(0.5\,\text{H}\). If the current in the primary coil changes at the rate of \(4\,\text{A s}^{-1}\), the induced emf in the secondary coil is
In an AC circuit containing a pure resistor, the phase difference between voltage and current is
According to Bohr's atomic model, the angular momentum of an electron in the \(n^{\text{th}}\) orbit is
A photon has energy \(6\,\text{eV}\). The corresponding work function of a metal is \(2\,\text{eV}\). The maximum kinetic energy of the emitted photoelectron is
A galvanometer of resistance \(50\,\Omega\) gives full-scale deflection when a current of \(2\,\text{mA}\) passes through it. The value of shunt resistance required to convert it into an ammeter of range \(2\,\text{A}\) is
The electric field strength at a point in an electric field is $30\,N/C$. Find the force experienced by a charge of $20\,C$ at that point.
$100\,\text{g}$ of water at $60^\circ C$ is added to $180\,\text{g}$ of water at $95^\circ C$. The resultant temperature of mixture is
A TV transmitting antenna is 81 m tall. Service area covered, if the receiving antenna is at the ground level, will be about:
Sodium and Copper have work functions 2.3 eV and 4.5 eV respectively. Then the ratio of their threshold wavelengths is nearly:
An electron is moving in an orbit of hydrogen atom in which there can be a maximum of six transitions. Another electron is moving in another orbit of hydrogen atom in which there can be a maximum of three transitions. The ratio of the velocity of electrons in these two orbits is:
In the logic circuit, if A=1 and B=1, the outputs \( \text{Y}_{3} \) and Y are respectively: