List of top Physics Questions

Intensity of gravitational field inside the hollow spherical shell is
Neutron changing into Proton by emiting electron and anti neutrino this due to
Attractive Force is exists between two protons inside the Nucleons this is due to
Repulsive force exist between two protons but side the nucleons this due to
Out of the following interactions the weakest is
A hollow spherical shell is compressed to half its radius. The gravitational potential at the centre
Two radioactive materials $X_1$ and $X_2$ have decay constants $10\lambda$ and $\lambda$ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of $X_1$ to that of $X_2$ will be 1/e after a time
Two long parallel wires are at a distance 2d apart. They carry steady equal currents flowing out of the plane of the paper as shown. The variation of the magnetic field B along the line XX' is given by
Starting with the same initial conditions, an ideal gas expands from volume V$_1$ to V$_2$ in three different ways, the work done by the gas is W$_1$ if the process is purely isothermal, W$_2$ if purely isobaric and W$_3$ if purely adiabatic, then
In a compound microscope, the intermediate image is
An ionized gas contains both positive and negative ions. If it is subjected simultaneously to an electric field along the + x-direction and a magnetic field along the +z-direction, then
An infinitely long conductor PQR is bent to form a right angle as shown in figure. A current I flows through PQR. The magnetic field due to this current at the point M is $H_1$. Now, another infinitely long straight conductor QS is connected at Q, so that current is I/2 in QR as well as in QS, the current in PQ remaining unchanged. The magnetic field at M is now $H_2.$ The ratio $H_1 /H_2$ is given by
A wind-powered generator converts wind energy into electric energy. Assume that the generator converts a fixed fraction of the wind energy intercepted by its blades into electrical energy. For wind speed v, the electrical power output will be proportional to
A monoatomic ideal gas, initially at temperature $T_1$, is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature T$_2$ by releasing the piston suddenly. If L$_1$ and L$_2$ are the lengths of the gas column before and after expansion respectively, then $T_1 / T_2$ is given by
A cubical block of side L rests on a rough horizontal surface with coefficient of friction $\mu$. A horizontal force F is applied on the block as shown. If the coefficient of friction is sufficiently high, so that the block does not slide before toppling, the minimum force required to topple the block is
One quarter section is cut from a uniform circular disc of radius R. This section has a mass M. It is made to rotate about a line perpendicular to its plane and passing through the centre of the original disc. Its moment of inertia about the axis of rotation is
A thin wire of length L and uniform linear mass density p is bent into a circular loop with centre at O as shown. The moment of inertia of the loop about the axis XX ' is
An ideal gas is initially at temperature T and volume V. Its volume is increased by $\Delta$V due to an increase in temperature $\Delta$T, pressure remaining constant. The quantity 5 = $\Delta$V / V$\Delta$T varies with temperature as
A train moves towards a stationary observer with speed 34 m/s. The train sounds a whistle and its frequency registered by the observer is $f_1$. If the train's speed is reduced to 17 m/s, the frequency registered is $f_2$. If the speed of sound is 340 m/s, then the ratio $f_1/ f_2$ is
A block of ice at I0$^{\circ}$C is slowly heated and converted to steam at 100$^{\circ}$C. Which of the following curves represents the phenomena qualitatively?
You are provided three bulbs of 15, 40 and 60 watt. Which of them has lowest resistance:
When the displacement is half the amplitude the ratio of potential energy to the total energy is:
When light of wavelength 300 nm falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, however light of 600 nm wavelength is sufficient for creating photoemission. What is the ratio of the work functions of the two emitters:
Two point charges + 3 $ \mu C $ and + 8 $ \mu C $ repel each other with a force of 40 N. If a charge of - 5 $ \mu C $ is added to each of them, then the force between them will become:
The dominant mechanisms for motion of charge carriers in forward and reverse biased silicon $ \text{p-n} $ junctions are: