List of top Physics Questions

Two moving coil galvanometers A and B having identical springs are placed in magnetic fields of 0.25 T and 0.5 T respectively. If the number of turns in A and B are 36 and 48, the areas of the coils A and B are 2.4 $\times 10^{-3}$ m$^2$ and 4.8 $\times 10^{-3}$ m$^2$ respectively, then the ratio of the current sensitivities of the galvanometers A and B is

If each resistance in the given figure is 9 $\Omega$, then the reading of the ammeter (A) is

An electric charge $10^{-3}\, \mu C$ is placed at the origin of the x-y plane. The potential difference between points A and B located at $(\sqrt{2}\, m, \sqrt{2}\, m)$ and $(2m, 0m)$ respectively is
An electric dipole with dipole moment $2 \times 10^{-10}\, C \cdot m$ is aligned at an angle $30^\circ$ with the direction of a uniform electric field of $10^4\, N/C$. The magnitude of the torque acting on the dipole is
The area of cross-section of a copper wire is $4 \times 10^{-7} m^2$ and the number of electrons per cubic meter in copper is $8 \times 10^{28}$. If the wire carries a current of 6.4 A, then the drift velocity of the electrons (in $10^{-3} m/s$) is
If a dielectric slab of dielectric constant 3 is introduced between the plates of a capacitor having electric field $1.5\, N/C$, then the electric displacement is
In Young's double slit experiment, if the distance between the slits is 2 mm and the distance of the screen from the slits is 100 cm, the fringe width is 0.36 mm. If the distance between the slits is decreased by 0.5 mm and the distance of the screen from the slits is increased by 50 cm, the fringe width becomes
According to Rayleigh, when sunlight travels through atmosphere, the amount of scattering is proportional to $n^{th}$ power of wavelength of light. Then the value of $n$ is
When both the source of sound and observer approach each other with a speed equal to 10% of the speed of sound, then the percentage change in frequency heard by the observer is nearly
When an ideal diatomic gas undergoes adiabatic expansion, if the increase in its volume is 0.5%, then the change in the pressure of the gas is
The heat supplied to a gas at a constant pressure of $5 \times 10^5\, Pa$ is 1000 kJ. If the volume of gas changes from 1 m$^3$ to 2.5 m$^3$, then the change in internal energy of the gas is

If the given graph shows the load (W) attached to and the elongation ($\Delta l$) produced in a wire of length 1 meter and cross-sectional area 1 mm$^2$, then the Young's modulus of the material of the wire is

To increase the RMS speed of gas molecules by 25%, the percentage increase in absolute temperature of the gas is to be
If some heat is given to a metal of mass 100 g, its temperature rises by 20 $^\circ$C. If the same heat is given to 20 g of water, the change in its temperature (in $^\circ$C) is (The ratio of specific heat capacities of metal and water is 1:10)
A wire of length 20 cm is placed horizontally on the surface of water and is gently pulled up with a force of $1.456 \times 10^{-2}\, N$ to keep the wire in equilibrium. The surface tension of water is
The ratio of the efficiencies of two Carnot engines A and B is 1.25 and the temperature difference between the source and the sink is the same in both engines. The ratio of the absolute temperatures of the sources of the engines A and B is
If the function $\sin^2 \omega t$ (where $t$ is time in seconds) represents a periodic motion, then the period of the motion is
Two smooth inclined planes A and B each of height 20 m have angles of inclination $30^\circ$ and $60^\circ$ respectively. If $t_1$ and $t_2$ are the times taken by two blocks to reach the bottom of the planes A and B from the top, then find the value of $t_1 - t_2$. (Acceleration due to gravity $g = 10\, m/s^2$)

On a smooth inclined plane, a block of mass $M$ is fixed to two rigid supports using two springs, each having spring constant $k$, as shown in the figure. If the masses of the springs are neglected, then the period of oscillation of the block is

The acceleration due to gravity at a height of $(\sqrt{2} - 1)R$ from the surface of the earth is (where $g = 10\, m/s^2$ and $R$ is the radius of the earth)
A body of mass 2 kg is moving towards north with a velocity of 20 m/s and another body of mass 3 kg is moving towards east with a velocity of 10 m/s. The magnitude of the velocity of the centre of mass of the system of the two bodies is
The moment of inertia of a solid cylinder of mass 2.5 kg and radius 10 cm about its axis is
Three vectors each of magnitude $3\sqrt{1.5}$ units are acting at a point. If the angle between any two vectors is $\frac{\pi}{3}$, then the magnitude of the resultant vector of the three vectors is
If the breaking strength of a rope is $\frac{4}{3}$ times the weight of a person, then the maximum acceleration with which the person can safely climb up the rope is (g - acceleration due to gravity)
A block of mass 2 kg is placed on a rough horizontal surface. If a horizontal force of 20 N acting on the block produces an acceleration of 7 m/s$^2$ in it, then the coefficient of kinetic friction between the block and the surface is (Acceleration due to gravity = 10 m/s$^2$)