List of top Physics Questions

A wire of length $L$ is drawn such that its diameter is reduced to half of its original diameter. If the initial resistance of the wire were $10\, \Omega$ , its new resistance would be
An ammeter reads upto $1$ ampere. Its internal resistance is $0.81\, ohm$. To increase the range to $10\, A$ the value of the required shunt is
A resistor is constructed as hollow cylinder of dimensions $ {{r}_{a}}=0.5\,cm $ and $ {{r}_{b}}=1.0\,cm $ and $ \rho =3.5\times {{10}^{-5}}\Omega m $ . The resistance of the configuration for the length of 5 cm cylinder is ... $ \times {{10}^{-3}}\Omega $ .
For a particle executing SHM the displacement x is given by x = A cos $\omega t$. Identify the graph which represents the variation of potential energy (PE) as a function of time t and displacement x.
Two springs of force constants $k$ and $2k$ are connected to a mass as shown below. The frequency of oscillation of the mass is
A mass of $30 \,kg$ is suspended from a spring of spring constant $15\, N/m$. The time period of vertical oscillations of mass is
The velocity of a particle in S.H.M. at displacement y from mean position is ( $ a= $ amplitude $ \omega = $ angular frequency)
$n$ identical spherical drops each of radius $r$ are charged to same potential $V$. They combine to form a bigger drop. The potential of the big drop will be :
An electric dipole placed in a nonuniform electric field experiences
A capillary tube of radius $r$ can support a liquid of weight $6.28 \times 10^{-4} \,N$. If the surface tension of the liquid is $5 \times 10^{-2} \,N / m$. The radius of capillary must be
A charge $q$ is placed at the centre of line joining two equal point charges each equal to $+Q$. The system of $3$ charges will be in equilibrium if $q$ is equal to
In the circuit shown, the effective capacitance between A and B is
Magnetic permeability is maximum for:
A frog can be levitated in a magnetic field produced by a current in a vertical solenoid placed below the frog. This is possible because the body of the frog behaves as
Magnetic permeability is maximum for
Curie temperature is the temperature above which
A body of mass $1\, kg$ is rotating in a vertical circle of radius $1\, m$. What will be the difference in kinetic energy at the top and at the bottom of the circle? $\left(\right.$ take $\left.g=10\, m / s ^{2}\right)$
The angle through which a cyclist bends when he covers a circular path of $34.3 \,m$ circumference in $\sqrt{22} \sec$ is $\left(g=9.8 \,m / s ^{2}\right)$
An object is thrown along a direction making an angle $45^{\circ}$ with the horizontal direction. The horizontal range of the object is equal to :
The escape velocity for a body projected vertically upwards from the surface of earth is $11\, km/s$. If the body is projected at an angle of $45^\circ$ with the vertical, the escape velocity will be
Four molecules of a gas have speeds $1,2,3$ and $4\, kms ^{-1}$. The value of rms speed of the gas molecules is :
Three vectors satisfy the relation $\overrightarrow{A}.\overrightarrow{B}=0$ and $\overrightarrow{A}.\overrightarrow{C}=0$ then $\overrightarrow{A}$ is parallel to
The time taken by AC of 50 Hz in reacting from zero to the maximum value is
The aperture of objective lens of a telescope is made large so as to
A steel wire $0.5\, m$ long has a total mass $kg$ and stretched with a tension of $800\, N$. The frequency with which it vibrates in its fundamental note will be :