List of top Physics Questions

Intensity of an electric field $E$ due to a dipole, depends on distance $r$ as:

A $40\, \mu F$ capacitor in a defibrillator is charged to $3000 \,V$. The energy stored in the capacitor is sent through the patient during a pulse of duration $2\, ms$. The power delivered to the patient is

Equipotential surfaces associated with an electric field which is increasing in magnitude along the $x-$ direction are

A charged particle $q$ is shot towards another charged particle $Q$ which is fixed, with a speed v it approaches $Q$ upto a closest distance $r$ and then returns. If $q$ were given a speed $2v$, the closest distances of approach would be

A diamagnetic substance is placed in a magnetic field of a bar magnet. Then it is

The true geographic north direction is found by using a compass needle. The magnetic meridian of the earth is along the axis of rotation of the earth.

For an isotropic medium $B,\, \mu,\, H$ and $M$ are related as (where $B,\, \mu_{0},\, H$ and $M$ have their usual meaning in the context of magnetic material :

Curie-Weiss law is obeyed by iron at a temperature ...........

A stone tied to one end of spring $80\,cm$ long is whirled in a horizontal circle with a constant speed. If stone makes $25 $ revolutions in $14 \sec$, the magnitude of acceleration of stone is :

A motorcycle is going on an over bridge of radius $R$. The driver maintains a constant speed. As the motorcycle is ascending on the over bridge, the normal force on it

A bullet of mass $0.01$ kg is fired from a rifle of mass $10$ kg with a speed of $200$ m/sec. The recoil speed of the rifle is

For a projectile on the horizontal surface of a planet $ y=8t-5t^{2} \, m$ shows height and $ x=8\,t \, m$ shows the horizontal distance, then the velocity with which the projectile is projected is

When light is incident on a diffraction grating the zero order principal maximum will be _____

Acceleration due to gravity is $ g $ on the surface of the earth. Then the value of the acceleration due to gravity at a height of $ 32\, km $ above earths surface is: (Assume radius of earth to be 6400 km)

If vibration of string is to be two times then tension in the string must be made :

We wish to see inside an atom. Assuming the atom to have a diameter of $100\, pm$, this means that one must be able to resolve a width of say $10\, pm$. If an electron microscope is used, the minimum electron energy required is about:

The materials suitable for making electromagnets should have

Rainbow is formed due to.............

Which isotope is likely to be most stable?

The waves produced by a motorboat sailing in water are

The waves which cannot travel in vacuum are:

The time period of an earth satellite in circular orbit is independent of

The susceptibility of ferromagnetic and paramagnetic substances are respectively:

The magnetic needle lying parallel to the magnetic field requires $W$ units of work to rotate it through $60^{\circ}$. The torque needed to maintain the needle in this position is :

The magnetic moment of a current $(I)$ carrying circular coil of radius $(r)$ and number of turns $(n)$ varies as