List of top Physics Questions

Four point charges are placed at the corners of a square $ABCD$ of side $10\, cm$, as shown in figure. The force on a charge of $1\,\mu C$ placed at the centre of square is
If $10^9$ electrons move out of a body to another body every second, then the time required to get a total charge of $1\,C$ on the other body is
If a body is charged by rubbing it, its weight
If a body is positively charged, then it has
If an electron has an initial velocity in a direction different from that of an electric field, the path of the electron is
In a medium of dielectric constant K, the electric field is $\vec{E}$ . If $\in_0$ is permittivity of the free space, the electric displacement vector is
In figure, two positive charges, $q_2$ and $q_3$ fixed along the $y$ axis, exert a net electric force in the $+x$ direction on a charge $q_1$ fixed along the $x$ axis. If a positive charge Q is added at ($x$, $0$), the force on $q_1$
Object may acquire an excess or deficiency of charge by
On charging by conduction, mass of a body may
What happens when some charge is placed on a soap bubble?
What is the electric flux linked with closed surface ?
When a body is charged by induction, then the body
When a person combs his hair, static electricity is sometimes generated by what process?
Which of the following statements about dipole moment is not true?
Which of the following is best insulator ?
Pick out the wrong statement (s) . (i) Vapour pressure of a liquid is the measure of the strength of intermolecular attractive forces. (ii) Surface tension of a liquid acts perpendicular to the surface of the liquid. (iii) Vapour pressure of all liquids is same at their freezing points. (iv) Liquids with stronger intermolecular attractive forces are more viscous than those with weaker intermolecular force.
Surface tension does not vary with
Surface tension of mercury is $ 0.465 \,N\, m^{-1} $ . The excess pressure inside a mercury drop of diameter $ 6 \,mm $ is
The speed $v$ of ripples on the surface of water depends on surface tension $ \sigma$ density p and wavelength $ \lambda $. The square of speed v is proportional to
The surface tension of a liquid at its boiling point is
The surface tension of a soap solution is $25 \times 10^{-3}\,N/m$. The excess pressure inside a soap bubble of diameter 1 cm is
Two soap bubbles of radii a and b combine to form a single bubble of radius 3) If P is the external pressure, then S.T. of the soap solutionis
A soap bubble of radius $r$ is blown up to form a bubble of radius $2 r$ under isothermal conditions. If $T$ is the surface tension of soap solution, the energy spent in the blowing
A spherical liquid drop of radius $R$ is divided into eight equal droplets. If surface tension is $T$, then work done in the process will be
An uncharged parallel plate capacitor filled with a dielectric of dielectric constant $K$ is connected to an air filled identical parallel capacitor charged to potential $V_1$. If the common potential is $V_2$, the value of $K$ is