List of top Physics Questions

In the given circuit, the points A, B and C are at same potential. If the potential difference between B and D is 30 V, then the potential difference between A and O is
A single turn circular coil is connected to a cell as shown. Magnetic field at the centre \(O\) of the coil is
Identify the wrong statement
A proton is travelling along the X-direction with velocity \(5 \times 10^6\,ms^{-1}\). The magnitude of force experienced by the proton in a magnetic field \(\vec{B} = (0.2\hat{i} + 0.4\hat{k})\) tesla is
A flow of \(10^6\) electrons per second in a conducting wire constitutes a flow of current of
The ratio of resistances of two copper wires of the same length and of same cross sectional area when connected in series to that when connected in parallel is
An electron moving with a constant velocity \(v\) along X-axis enters a uniform electric field applied along Y-axis. Then the electron moves
A battery of 6 V and internal resistance \(2\,\Omega\) is connected to a silver voltameter. If the current of \(1.5\,A\) flows through the circuit, the resistance of the voltameter is
The resistivity of the material of a potentiometer wire is \(5 \times 10^{-6}\,\Omega m\) and its area of cross section is \(5 \times 10^{-6}\,m^2\). If \(0.2\,A\) current is flowing through the wire, then the potential drop per metre length of the wire is
The velocity acquired by a charged particle of mass \(m\) and charge \(Q\) accelerated from rest by a potential \(V\) is
A \(5\,\mu F\) capacitor is fully charged by a \(12\,V\) battery and then disconnected. If it is connected now in parallel to an uncharged capacitor, the voltage across it is \(3\,V\). Then the capacity of the uncharged capacitor is
A wave of frequency 500 Hz travels with a speed of 360 ms\(^{-1}\). The distance between two nearest points which are 60° out of phase is
An electric dipole of moment \(\mu = 400\,\mu C\,m\) is placed in a transverse electric field \(E = 50\,V/m\) at an angle of \(30^\circ\). Then a torque of
A charge \(Q\) is distributed over two concentric hollow spheres of radii \(a\) and \(b\) \((a>b)\), so that the surface charge densities are equal. The potential at the common centre is \(\frac{1}{4\pi \varepsilon_0}\) times
The apparent frequency observed by a moving observer away from a stationary source is 20% less than the actual frequency. If the velocity of sound in air is 330 ms\(^{-1}\), then the velocity of the observer is
A string under tension of 129.6 N produces 10 beats/second when it vibrates along with a tuning fork. When the tension in the string is increased to 160 N, it vibrates in unison with the tuning fork. Then frequency of the tuning fork is
Two oscillating simple pendulums with time periods \(T\) and \(\frac{5T}{4}\) are in phase at a given time. They are again in phase after an elapse of time
For a monatomic gas, the molar specific heat at constant pressure divided by the molar gas constant \(R\) is equal to
When two springs A and B with force constants \(k_A\) and \(k_B\) are stretched by the same force, then the respective ratio of the work done on them is
Hot water in a vessel kept in a room, cools from \(70^\circ C\) to \(65^\circ C\) in \(t_1\) minutes, from \(65^\circ C\) to \(60^\circ C\) in \(t_2\) minutes and from \(60^\circ C\) to \(55^\circ C\) in \(t_3\) minutes. Then
For a particle moving according to the equation \(x = a \cos \pi t\), the displacement in 3 s is
Two perfectly black spheres A and B having radii 8 cm and 2 cm are maintained at temperatures \(127^\circ C\) and \(527^\circ C\) respectively. The ratio of the energy radiated by A to that by B is
A metallic bar of coefficient of linear expansion \(10^{-5}\,\text{K}^{-1}\) is heated from \(0^\circ C\) to \(100^\circ C\). The percentage increase in its length is
A liquid is filled upto a height of 20 cm in a cylindrical vessel. The speed of liquid coming out of a small hole at the bottom of the vessel is (g = 10 ms\(^{-2}\))
Two capillary tubes A and B of diameter 1 mm and 2 mm respectively are dipped vertically in a liquid. If the capillary rise in A is 6 cm, then the capillary rise in B is