List of top Physics Questions

A mirror forms a real image of unit magnification. Its nature is
There are two liquid drops of different radii. The excess pressure inside over the outside is:
A concave lens of glass, refractive index 1.5 has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a
Yellow light is used in a single slit diffraction experiment with slit width of 0.6 mm. If yellow light is replaced by X-rays, then the observed pattern will reveal
A body is sliding on a smooth inclined plane requires 4 second to reach the bottom starting from rest at the top. How much rime does it take to cover $ \frac{1}{4} $ the distance starting from rest?
A photocell stops emission if it is maintained at 2 V positive potential. The energy of most energetic photoelectron is:
A bullet of mass 50 g is fired from a 5 kg gun with a velocity of 1 km/sec. The speed of recoil of the gun is:
Two spheres made of same substance have diameters in the ratio 1 : 2. Their thermal capacities are in the ratio of:
A straight wire of diameter 0.5 mm carrying a current of 1 A is replaced by the another wire of 1 mm diameter carrying the same current. The strength of the magnetic field far away is
The current in the given circuit is
If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is
A $ 500 \,kg $ car takes a round turn of radius $ 50\, m $ with a velocity of $ 36\, km/h $ . The centripetal force is
Colours appear on a thin soap film and on soap bubbles due to the phenomenon of
Depletion layer consists of
The photoelectric work function for a metal surface is 4.125 eV. The cut-off wavelength for this surface is
What is the effective capacitance between points X and y?
When air is replaced by a dielectric medium of constant K, the maximum force of attraction between two charges separated by a distance
A p-n junction diode can be used as
A device which converts electrical energy into mechanical energy is
An elliptical cavity is carved within a perfect conductor. A positive charge q is placed at the centre of the cavity. The points A and B are on the cavity surface as shown in the figure.then
Mass of a photon of frequency v is given by
Biaxial crystal among the following is
In the nuclear reaction $ _{13}A{{l}^{27}}(d,\alpha )x,X $ is:
The resistance of a discharge tube is
A disc is rolling (without slipping) on a horizontal surface. C is its centre and Q and P are two points equidistant from C. Let $v_P$, $v_q$ and $v_c$ be the magnitude of velocities of points P,Q and C respectively, then