List of top Physics Questions asked in JEE Main, KCET

A current I flows in the anticlockwise direction through a square loop of side a lying in the xoy plane with its center at the origin. The magnetic induction at the center of the square loop is
Maximum acceleration of the train in which a $50\, kg$ box lying on its floor will remain stationary (Given : Co-efficient of static friction between the box and the train?? floor is $0.3$ and $g = 10 \,ms^{-2}$)
A source of sound is moving with a velocity of $50 \, ms^{-1}$ towards a stationary observer. The observer measures the frequency of sound as $500\, Hz$. The apparent frequency of sound as heard by the observer when source is moving away from him with the same speed is (Speed of sound at room temperature $350 \, ms^{-1}$)
Electromagnetic radiation used to sterilise milk is
In a series $LCR$ circuit an alternating $emf \,(v)$ and current $\,(i)$ are given by the equation $v = v_0 \sin \omega t, i = i_0 \sin \left( \omega t + \frac{\pi}{3} \right)$ The average power dissipated in the circuit over a cycle of $AC$ is
A plane glass plate is placed over a various coloured letters (violet, green, yellow, red). The letter which appears to raised more
Nature of equipotential surface for a point charge is
A capacitor of capacitance $10\, \mu F$ is connected to an $AC$ source and an $AC$ Ammeter. If the source voltage varies as $V = 50 \sqrt{2} \, \sin \, 100 t$, the reading of the ammeter is
Effective resistance between $A$ and $B$ in the following circuit
Four metal plates are arranged as shown. Capacitance between $X$ and $Y (A \to$ Area of each plate, $d \to$ distance between the plates)
A body falls freely for $10\,sec$. Its average velocity during this journey (take $g = 10 \, ms^{-2}$)
A pan filled with hot food cools from $94 ^{\circ}C$ to $86^{\circ}C$ in $2$ minutes. When the room temperature is $20 ^{\circ}C$. How long will it cool from $74 ^{\circ}C$ to $66 ^{\circ}C$ ?
In the following network potential at $'O'$
Variation of resistance of the conductor with temperature is as shown .The temperature co-efficient $(\alpha)$ of the conductor is
Mobility of free electrons in a conductor is
A particle executing $SHM $ has a maximum speed of $0.5 \, ms^{ -1}$ and maximum acceleration of $1.0 \, ms^{-2}$ The angular frequency of oscillation is
The process of superimposing message signal on high frequency carrier wave is called
A long solenoid with $40$ turns per cm carries a current of $1\,A$. The magnetic energy stored per unit volume is ........ $J/ m^3$.
A gas under constant pressure of $ 45 \times 10^5\, p_a $ when subjected to $ 800 \,k j $ of heat, changes the volume from $ 0.5\, m^3 $ to $ 2.0\, m^3 $ . The change in internal energy of the gas is
The $rms$ value of current in a $50 \,Hz$ $AC$ circuit is $6\,A$. The average value of $AC$ current over a cycle is
The component of a vector $\vec{r}$ along $x$-axis will have maximum value if
A conducting wire carrying current is arranged as shown. The magnetic field at $'O'$
A simple harmonic oscillator of angular frequency $2 \,rad \,s^{-1}$ is acted upon by an external force $F= \sin\, t \,N$. If the oscillator is at rest in its equilibrium position at $t\, =\, 0$, its position at later times is proportional to :
An experiment takes $10\, min$ to raise the temperature of water in a container from $0^{\circ} C$ to $100^{\circ} C$ and another $55\, min$ to convert it totally into steam by a heater supplying heat at a uniform rate. Neglecting the specific heat of the container and taking specific heat of water to be $1\, cal / g { }^{\circ} C$, the heat of vaporisation according to this experiment will come out to be
When $5\,V$ potential difference is applied across a wire of length $0.1\,m$, the drift speed of electrons is $2.5\times10^{-4}$ $ms^{-1}$. If the electron density in the wire is $8\times10^{28}\, m^{-3}$ the resistivity of the material is close to