List of top Physics Questions

A sample of an ideal gas ($\gamma = 5/3$) is heated at constant pressure. If 100 J of heat is supplied to the gas, the work done by the gas is ______.
A circular coil carrying current 'I' has a radius 'r' and 'n' turns. The magnetic field along the axis of a coil at a distance '2√2 r' from its centre is ______.
A horizontal pipeline carries water in streamline flow. At $A_1 = 10$ cm$^2$, $v_1 = 1$ m/s and $P_1 = 2000$ Pa. The pressure at $A_2 = 5$ cm$^2$ is \dots [$\rho = 1000$ kg/m$^3$]
The volume of a metal sphere increases by 0.33% when its temperature is raised by 50$^\circ$C. The coefficient of linear expansion of the metal is ______.
A bob of mass 'm' is tied by a string wound on a flywheel (disc) of radius 'R' and mass 'm'. If the bob has covered a vertical distance 'h', then the angular speed of the wheel will be \dots
As shown in the figure, $S_1$ and $S_2$ are identical springs with spring constant K each. The oscillation frequency of the mass 'm' is 'f'. If the spring $S_2$ is removed, the oscillation frequency will become ______.
A black body emits radiation of maximum intensity at wavelength '$\lambda$' at temperature $T$ K. Its corresponding wavelength at temperature $1.5 T$ K will be ______.
Two identical metal plates are given charges $q_1$ and $q_2$ ($q_2 < q_1$) respectively. If they are now brought close together to form a parallel plate capacitor with capacitance 'C', the potential difference 'V' between the plates is \dots
One of the following values of inputs A, B and C respectively gives output (Y) of the following combination of logic gates as '1' is \dots
The moment of inertia of a solid sphere of mass 'm' and radius 'R' about its diametric axis is 'I'. Its moment of inertia about a tangent in the plane is ______.
The initial average kinetic energy of the molecules was E, when a gas sample is at 27$^\circ$C. When the gas is heated to 327$^\circ$C, then the final average kinetic energy will be ______.
The amount of work done in blowing a soap bubble such that its diameter increases from 'd' to 'D' is ($T$ = surface tension of solution) ______.
When one end of a capillary tube is dipped in water, the height of water column is 'h'. The upward force of 105 dyne due to surface tension is balanced by the weight of water column. The inner circumference of the capillary tube is ______.
In hydrogen atom in its ground state, the first Bohr orbit has radius $r_1$. When the atom is raised to one of its excited states, the electron's orbital velocity becomes one-third. The radius of that orbit is \dots
Heat supplied $dQ$ = increase in internal energy $dU$ is true for \dots
In the following figure magnitude of the magnetic field at the point p is ______.
A particle starts oscillating simple harmonically from its mean position with time period 'T'. At time $t = T/6$, the ratio of the potential energy to kinetic energy of the particle is \dots
Two equally charged small balls placed at a fixed distance experience a force 'F'. A similar uncharged ball after touching one of them is placed at the middle point between the two balls. The force experienced by this ball is ______.
A thin uniform rod of length 'L' and mass 'M' is swinging freely about a horizontal axis passing through its end. Its maximum angular speed is '$\omega$'. Its centre of mass rises to a maximum height of ______.
Using Bohr's quantisation condition, what is the rotational energy in the second orbit for a diatomic molecule? ($I$ = moment of inertia and $h$ = Planck's constant) ______.
A piece of semiconductor is connected in series in an electric circuit. On increasing the temperature, the current in the circuit will ______.
A tuning fork gives 5 beats per second with 40 cm length of sonometer wire. If the length of the wire is shortened by 1 cm, the number of beats is still the same. The frequency of the fork is ______.
In an a.c. circuit, a resistance 'R' is connected in series with an inductance 'L'. If phase angle between voltage and current is 45$^\circ$, the value of inductive reactance will be ($\tan 45^\circ = 1$) ______.
An a.c. source of frequency 'f' is connected to a circuit containing an inductance 'L' and resistance 'R' in series. The impedance of this circuit is ______.
A balloon is filled at 27$^\circ$C and 1 atmospheric pressure by volume 500 m$^3$ helium gas. At -3$^\circ$C and 0.5 atmospheric pressure, the volume of helium gas will be ______.