List of top Physics Questions

The period of oscillation of a simple pendulum of constant length al surface of the earth is $T$. Its time period inside a mine will be
The peak voltage in the output of a half-wave diode rectifier fed with a sinusoidal signal without filter is $10\, V$. The DC component of the output voltage is
The moment of inertia of a thin uniform circular disc about one of the diameters is $l$. Its moment of inertia about an axis perpendicular to the plane of the disc and passing through its centre is
The maximum intensity of fringes in Youngs experiment is $I$. If one of the slit is closed then the intensity at that place becomes $I_{0}$ . Which of the following relation is true?
The limiting friction is
The intensity of sound increases at night due to
The driver of a car travelling at velocity $v$ suddenly sees a broad wall in front of him at a distance $d$. He should
The displacement of an object attached to a spring and executing simple harmonic motion is given by $x = 2 ??10^{-2}\, cos\, \pi t$ metres. The time at which the maximum speed first occurs is
The dimensions of $\frac{e^{2}}{4 \pi \varepsilon_{0} h c'}$, where $e, \varepsilon_{0}, h$ and $c$ and $c$ are electronic charge, electric permittivity Planck's constant and velocity of light in vacuum respectively
The dimensions of universal gravitational constant are
The degrees of freedom of a molecule of a triatomic gas are
The capacity of an isolated conducting sphere of radius $R$ is proportional to
On introducing a thin film in the path of one of the two interfering beams, the central fringe will shift by one fringe width. If $ \mu =1.5, $ the thickness of the film is (wavelength of monochromatic light is $ \lambda $ )
Moment of inertia of ring about its diameter is $ I. $ Then, moment of inertia about an axis passing through centre perpendicular to its plane is
Mass spectrometric analysis of potassium and argon atoms in a Moon rock sample shows that the ratio of the number of (stable) ${ }^{40} Ar$ atoms present to the number of (radioactive) ${ }^{40} K$ atoms is $10.3$. Assume that all the argon atoms were produced by the decay of potassium atoms, with a half-life of $1.25 \times 10^{9} yr$. How old is the rock?
Infrared radiations are detected by
In the diagram shown below all three rods are of equal length $L$ and equal mass $M$. The system is rotated such that rod $B$ is the axis. What is the moment of inertia of the system?
In an $L-R$ circuit, time constant is that time in which current grows from zero to the value where $ I_{0}$ is steady state current.
If the half-life of any sample of radioactive substance is $4$ days, then the fraction of sample will remain undecayed after $2$ days, will be?
If light is a longitudinal wave, it cannot explain
If the critical angle for total internal reflection from medium to vacuum is $ 30{}^\circ $ , the velocity of light in medium is
If average velocity becomes $4$ times then what will be the effect on rms velocity at that temperature?
In a potentiometer the null point is obtained at $7^\text{th}$ wire. If now we have to change the null point at $9^\text{th}$ wire, what should we do?
If $B_{H}=\frac{1}{\sqrt{3}} B_{v}$, find angle of dip. (where symbols have their usual meanings)
Graph of input characteristic of common emitter amplifier is