List of top Physics Questions

Four ideal diodes are connected as shown then the current drawn from the battery is

An object placed at $10$ cm in front of a concave mirror of focal length $8$ cm gives image of magnification of

Microwaves are

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

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

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

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

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

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

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

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

If an ideal heat engine with an efficiency of $40\%$ rejects heat at $27^\circ$C, then it should have absorbed heat at

Two perfect monoatomic gases at temperatures \(300\) K and \(410\) K are mixed without any loss of heat. If \(10^{24}\) and \(10^{23}\) are the number of molecules in the respective gases, then the temperature of the mixture is

For a particle executing simple harmonic motion with amplitude $A$ and time period $T$ along x-axis, the time taken by the particle to move from $x = 0$ to $x = A$ is

If the temperature $T$ of oxygen molecule is raised to $9T$, then its root mean square speed $v$ is increased to

With Laplace correction in Newton’s formula for the velocity of sound in gases, the velocity of sound in monoatomic gas at STP is

If the temperature of $2$ moles of krypton gas is increased from $-11^\circ$C to $89^\circ$C at constant volume, then (specific heat at constant volume of krypton is $C_V$)

The ratio of the weights of an object of mass $m$ at a height $R$ and $2R$ from the surface of earth is ($R$ is the radius of earth)