List of top Physics Questions asked in JEE Main

At very high frequencies, the effective impedance of the given circuit will be ________ $\Omega$.

An LCR circuit contains resistance of 110 $\Omega$ and a supply of 220 V at 300 rad/s angular frequency. If only capacitance is removed from the circuit, current lags behind the voltage by 45°. If on the other hand, only inductor is removed the current leads by 45° with the applied voltage. The rms current flowing in the circuit will be:

A 0.07 H inductor and a 12 $\Omega$ resistor are connected in series to a 220 V, 50 Hz ac source. The approximate current in the circuit and the phase angle between current and source voltage are respectively. [Take $\pi$ as 22/7]

The angular frequency of alternating current in a L-C-R circuit is 100 rad/s. The components connected are shown in the figure. Find the value of inductance of the coil and capacity of condenser. (Note: Based on typical values for this specific question where $V_L = V_C$ or resonance is implied).

A resonance circuit having inductance and resistance $2 \times 10^{-4}$ H and $6.28$ Ω respectively oscillates at 10 MHz frequency. The value of quality factor of this resonator is __________.

In a series LCR circuit, the inductive reactance ($X_L$) is 10 $\Omega$ and the capacitive reactance ($X_C$) is 4 $\Omega$. The resistance (R) in the circuit is 6 $\Omega$. The power factor of the circuit is:

A 100 $\Omega$ resistance, a 0.1 $\mu$F capacitor and an inductor are connected in series across a 250 V supply at variable frequency. Calculate the value of inductance of inductor at which resonance will occur. Given that the resonant frequency is 60 Hz.

An AC source rated 220 V, 50 Hz is connected to a resistor. The time taken by the current to change from its maximum to the rms value is :

In a series LCR resonance circuit, if we change the resistance only, from a lower to higher value :

A series LCR circuit is designed to resonate at an angular frequency $ \omega_0 = 10^5 $ rad/s. The circuit draws 16 W power from a 120 V source at resonance. The value of resistance $ R $ in the circuit is _____ Ω.

A huge circular arc of length 4.4 ly subtends an angle '4s' at the centre of the circle. How long it would take for a body to complete 4 revolution if its speed is 8 AU per second ?
Given: 1 ly = $9.46 \times 10^{15}$ m
1 AU = $1.5 \times 10^{11}$ m

If velocity [V] time [T] and force [F] are chosen as the base quantities, the dimensions of the mass will be :

The diameter of a spherical bob is measured using a vernier callipers. 9 divisions of the main scale, in the vernier callipers, are equal to 10 divisions of vernier scale. One main scale division is 1 mm. The main scale reading is 10 mm and $8^{th}$ division of vernier scale was found to coincide exactly with one of the main scale division. If the given vernier callipers has positive zero error of 0.04 cm, then the radius of the bob is ________ $\times 10^{-2}$ cm.

Assertion A : If in five complete rotations of the circular scale, the distance travelled on main scale is 5 mm and there are 50 total divisions on circular scale, then least count is 0.001 cm.
Reason R : Least Count = $\frac{\text{Pitch}}{\text{Total divisions on circular scale}}$

In the given figure, a mass $M$ is attached to a horizontal spring which is fixed on one side to a rigid support. The spring constant of the spring is $k$. The mass oscillates on a frictionless surface with the time period $T$ and amplitude $A$. When the mass is in an equilibrium position, as shown in the figure, another mass $m$ is gently fixed upon it. The new amplitude of oscillation will be :

If the length of the pendulum in pendulum clock increases by 0.1%, then the error in time per day is :

Two simple harmonic motions are represented by the equations $ x_1 = 5 \sin(2\pi t + \frac{\pi}{4}) $ and $ x_2 = 5\sqrt{2}(\sin(2\pi t) + \cos(2\pi t)) $. The amplitude of second motion is __________ times the amplitude in first motion.

The variation of displacement with time of a particle executing free simple harmonic motion is shown in the figure.
The potential energy U(x) versus time (t) plot of the particle is correctly shown in figure :

Two simple harmonic motion, are represented by the equations
$y_1 = 10 \sin\left(3\pi t + \frac{\pi}{3}\right)$
$y_2 = 5 (\sin(3\pi t) + \sqrt{3} \cos(3\pi t))$
Ratio of amplitude of $y_1$ to $y_2=x: 1$. The value of x is _________.

A particle of mass $ 1 \, kg $ is hanging from a spring of force constant $ 100 \, Nm^{-1} $. The mass is pulled slightly downward and released so that it executes free simple harmonic motion with time period T. The time when the kinetic energy and potential energy of the system will become equal, is $ \frac{T}{x} $. The value of x is $\dots\dots\dots$.

A bob of mass 'm' suspended by a thread of length $l$ undergoes simple harmonic oscillations with time period T. If the bob is immersed in a liquid that has density $\frac{1}{4}$ times that of the bob and the length of the thread is increased by $1/3^{rd}$ of the original length, then the time period of the simple harmonic oscillations will be :

For a body executing S.H.M. :
(a) Potential energy is always equal to its K.E.
(b) Average potential and kinetic energy over any given time interval are always equal.
(c) Sum of the kinetic and potential energy at any point of time is constant.
(d) Average K.E. in one time period is equal to average potential energy in one time period.
Choose the most appropriate option from the options given below :

Two identical springs of spring constant '2k' are attached to a block of mass m and to fixed support (see figure). When the mass is displaced from equilibrium position on either side, it executes simple harmonic motion. The time period of oscillations of this system is:

Y = A sin($\omega$t+$\phi_0$) is the time-displacement equation of a SHM. At t = 0 the displacement of the particle is Y = $\frac{A}{2}$ and it is moving along negative x-direction. Then the initial phase angle $\phi_0$ will be:

A particle starts executing simple harmonic motion (SHM) of amplitude 'a' and total energy E. At any instant, its kinetic energy is $\frac{3E}{4}$ then its displacement 'y' is given by :