List of top Physics Questions

In a metre bridge experiment null point is obtained at $20\, cm$ from one end of the wire when resistance $X$ is balanced against another resistance $Y$. If $X < Y$, then where will be the new position of the null point from the same end, if one decides to balance a resistance of $4X$ against $Y$ ?
The resistance of tungsten filament at $150^{\circ} C$ is $133 \Omega$ what will be its resistance at $500^{\circ} C$ ? The temperature coefficient of resistance of tungsten is $0.0045 /{ }^{\circ} C$.
The resistance of the series combination of two resistances is $S$. When they are joined in parallel through total resistance is $P$. If $S = nP$, then the minimum possible value of $n$ is
The thermistors are usually made of
A block P of mass m is placed on a horizontal frictionless plane. A second block of same mass m is placed on it and is connected to a spring of spring constant k, the two blocks are pulled by a distance A. Block Q oscillates without slipping. What is the maximum value of frictional force between the two blocks?
A spring has length $I$ and spring constant $k$. If spring is divided in two equal pans then spring constant of each part is:
The total energy of particle, executing simple harmonic motion is
Two springs are connected to a block of mass $M$ placed on a frictionless surface as shown below. If both the springs have a spring constant $k$, the frequency of oscillation of the block is
A simple pendulum has time period $T$. The bob is given negative charge and surface below it is given positive charge. The new time period will be:
The bob of a simple pendulum executes simple harmonic motion in water with a period $t$, while the period of oscillation of the bob is $t_0$ in air. Neglecting frictional force of water and given that the density of the bob is $\left(\frac{4}{3}\right)\times1000\,kg/m^{3}.$ What relationship between $t$ and $t_0$ is true?
A particle of mass $m$ is attached to a spring (of spring constant $k$) and has a natural angular frequency $\omega_0$. An external force $F(t)$ proportional to $cos\omega t$ $(\omega?\omega_0)$ is applied to the oscillator. The time displacement of the oscillator will be proportional to
If for a particle executing SHM, the equation of SHM is given as y= a cos $\omega$t Then which of the following graph represents the variation in its potential energy?
A simple pendulum is vibrating in an evacuated chamber, it will oscillate with:
A spring executes SHM with mass of $10 \,kg$ attached to it. The force constant of spring is $10\, N / m$. If at any instant its velocity is $40 \,cm / sec$, the displacement will be (where amplitude is $0.5 \,m$ ) :
How is the time period of simple pendulum vary with its amplitude?
In forced oscillation of a particle the amplitude is maximum for a frequency $\omega_1$ of the force, while the energy is maximum for a frequency $\omega_2$ of the force, then
One-fourth length of a spring of force constant $k$ is cut away. The force constant of the remaining spring will be
What are the units of K=$\frac{1}{4\pi\,\in_0}$
The separation between the two charges $ +q $ and $ -q $ becomes double. The value of force will be:
When a glass rod is rubbed with silk, the amount of positive charge acquired by glass rod in magnitude is:
A charged oil drop is suspended in a uniform field of $3 ? 10^4 \,V/m$ so that it neither falls nor rises. The charge on the drop will be (take the mass of the charge $= 9.9 ? 10^{-15}\, kg$ and $g = 10\, m/s^2$)
Consider the charge configuration and a spherical Gaussian surface as shown in the figure. When calculating the flux of the electric field over the spherical surface, the electric field will be due to.
The electric field due to a uniformly charged sphere of radius $R$ as a function of the distance from its centre is represented graphically by
If a square coil is making an angle $ 60^{\circ }$ with electric field $E $ according to figure the electric flux passing through the square coil is (the side of square is $4\, cm$):
In the basic $CsCL$ crystal structure, $Cs^+$ and $Cl^-$ ions are arranged in a bcc configuration as shown in the figure. The net electrostatic force exerted by the eight $Cs^{+}$ ions on the $Cl^-$ ions is