List of top Physics Questions

In an LCR series circuit, at resonance
A bar magnet of moment of inertia \(9 \times 10^{-5} \text{ kg m}^2\) placed in a vibration magnetometer and oscillating in a uniform magnetic field \(16\pi^2 \times 10^{-5} \text{ T}\) makes 20 oscillations in 15 s. The magnetic moment of the bar magnet is
If a magnetic dipole of moment M situated in the direction of a magnetic field B is rotated by \(180^\circ\), then the amount of work done is
A rigid container with thermally insulated walls contains a gas and a coil of resistance 50 \(\Omega\), carrying a current of 1 A. The change in internal energy of the gas after 2 minutes will be
Five cells each of emf E and internal resistance \(r\) send the same amount of current through an external resistance R whether the cells are connected in parallel or in series. Then the ratio \( \left( \frac{R}{r} \right) \) is
The power dissipated in the transmission cables carrying current I and voltage V is inversely proportional to
The magnitude of the magnetic field inside a long solenoid is increased by
If the ammeter A shows a zero reading in the circuit shown below, the value of resistance R is
A plane square sheet of charge of side 0.5 m has uniform surface charge density. An electron at 1 cm from the centre of the sheet experiences a force of \( 1.6 \times 10^{-12} \) N directed away from the sheet. The total charge on the plane square sheet is (\( \epsilon_0 = 8.854 \times 10^{-12} \text{ C}^2\text{m}^{-2}\text{N}^{-1} \))
In the network shown below, if potential across XY is 4 V, then the input potential across AB is
The energy stored in a capacitor of capacitance C having a charge Q under a potential V is
The electrostatic force between two point charges is directly proportional to the
The time period of revolution of a charge \(q_1\) and of mass \(m\) moving in a circular path of radius \(r\) due to Coulomb force of attraction with another charge \(q_2\) at its centre is
A point charge of 2 C experiences a constant force of 1000 N when moved between two points separated by a distance of 2 cm in a uniform electric field. The potential difference between the two points is
The total energy of the particle executing simple harmonic motion of amplitude A is 100 J. At a distance of 0.707 A from the mean position, its kinetic energy is
Identify the wrong statement from the following
Two travelling waves, \( y_1 = A \sin [ k ( x + ct ) ] \) and \( y_2 = A \sin [ k ( x - ct ) ] \) are superposed on a string. The distance between adjacent antinodes is
If a stretched wire is vibrating in the second overtone, then the number of nodes and antinodes between the ends of the string are respectively
Pick out the correct statement in the following with reference to stationary wave pattern
A molecule of a gas has six degrees of freedom. Then the molar specific heat of the gas at constant volume is
Total number of degrees of freedom of a rigid diatomic molecule is
If the differential equation for a simple harmonic motion is \( \frac{d^2y}{dt^2} + 2y = 0 \), the time-period of the motion is
A Carnot engine operating between temperatures \(T_1\) and \(T_2\) has efficiency 0.2. When \(T_2\) is reduced by 50 K, its efficiency increases to 0.4. Then \(T_1\) and \(T_2\) are respectively
If \(m\) represents the mass of each molecule of a gas and \(T\), its absolute temperature, then the root mean square velocity of the gaseous molecule is proportional to
Two soap bubbles each with radius \(r_1\) and \(r_2\) coalesce in vacuum under isothermal conditions to form a bigger bubble of radius \(R\). Then \(R\) is equal to