List of top Physics Questions

Calculate the equivalent resistance between two diametrically opposite points of a circular wire of total resistance \(12\,\Omega\).
A stone is dropped from a height of \(45\,\text{m}\). What is the time taken to reach the ground? \((g = 10\,\text{m/s}^2)\)
The dimensional formula of \( \frac{1}{2}\varepsilon_0 E^2 \) (\(\varepsilon_0\) = permittivity of vacuum and \(E\) = electric field) is \(M^aL^bT^c\). The value of \(2a-b+c\) is:
The difference in magnitudes of angular momentum of the electrons revolving in \(5^{\text{th}}\) Bohr’s orbit and \(3^{\text{rd}}\) Bohr’s orbit of hydrogen atom is
If a radioactive parent nucleus \({}^{236}_{94}X\) emits two alpha particles and two \(\beta\) particles successively to reach the daughter nucleus \({}^{a}_{b}Y\), then the values of \(a\) and \(b\) are
Four ideal diodes are connected as shown then the current drawn from the battery is
Intrinsic semiconductors Ge or Si doped with
Two identical transformers \(A\) and \(B\) each with \(\dfrac{N_p}{N_s} = 2\) are connected such that the secondary output obtained from \(A\) is given as the primary input voltage for \(B\). If the primary ac voltage of \(A\) is \(200\) V, then the secondary voltage from \(B\) is
The magnifying power of a telescope of length $76$ cm in the normal adjustment is $75$. Then the focal lengths of the objective and eyepiece lenses are, respectively,
The fringe width obtained in a given Young’s double slit experimental set up for red light, blue light and green light are, respectively, $\beta_R$, $\beta_B$ and $\beta_G$. Then
An object placed at $10$ cm in front of a concave mirror of focal length $8$ cm gives image of magnification of
Microwaves are
In a uniform magnetic field \(\vec{B}\), a bar magnet of magnetic moment \(M\) is kept suspended at an angle of \(60^\circ\) with respect to \(\vec{B}\). The work done to turn it from \(60^\circ\) to \(90^\circ\) with respect to the field is
If a current carrying circular loop is suspended in a uniform magnetic field \(\vec{B}\), then
Three cells of $3$ V, $4$ V and $4$ V with respective internal resistances $0.5\,\Omega$, $0.75\,\Omega$ and $0.75\,\Omega$ are connected in series to a resistor of $4\,\Omega$. Then the current in the circuit is
A wire of length $4$ m carrying a current of $1$ A is bent to form a circular loop. The magnetic moment of the loop (in A m$^2$) is
The flow of current of \(2\) A through a straight solenoid of length \(2\) m produces a magnetic field of \(2\pi \times 10^{-4}\) T at its centre. Then the number of turns in the solenoid is
The plane of a circular loop of area \(150\ \text{cm}^2\) is perpendicular to a uniform magnetic field of \(0.5\) T. If the loop is turned such that its plane is in the direction of the field in \(0.5\) s, then the induced emf produced is
If an infinitely long uniformly charged wire produces an electric field of intensity $E$ at a distance $d$ from it, then the linear charge density $\lambda$ of the wire is
$A$, $B$ and $C$ are three points in space forming an equilateral triangle of side $10$ cm. If a point charge $8\,\mu C$ is placed at $A$, then the work done in moving a unit charge from $B$ to $C$ is
Three capacitors $A,B,C$ with respective capacitance of $1\,\mu F$, $2\,\mu F$ and $3\,\mu F$ are connected as shown. For a given voltage source $V$ connected across them, the combination that can store the maximum energy is
The ratio of the rate of flow of electrons through three resistors connected in parallel to a voltage source $V$ is $3 : 2 : 1$, then the ratio of their respective resistance values is
The ratio of the heat produced in a $2\,\Omega$ and a $4\,\Omega$ resistor connected in series with a voltage source of $12$ V is
The equipotential surface of a system of two point charge $5\,\mu C$ and $-5\,\mu C$ at points $A$ and $B$ separated by $80$ cm is a plane perpendicular to the line connecting $A$ and $B$ at
If an ideal heat engine with an efficiency of $40\%$ rejects heat at $27^\circ$C, then it should have absorbed heat at