List of top Physics Questions

Two long straight conductors carrying equal current kept parallel at a separation of $d$ metre experience a force per unit length. If the distance of separation is made $2d$, then to maintain the same force per unit length on each conductor, the current in each conductor should be increased to
When a bar magnet of dipole moment $m$ is suspended in a uniform magnetic field $B$, then
If three cells each of emf $2,V$ and internal resistance $1,\Omega$ are connected to a resistor of $4.5,\Omega$ as shown, then the current through the resistor is
With increase in temperature, the resistivity of
If the resistance of a uniform wire of length $1,m$ of cross-sectional area $0.1,m^2$ is $12,\Omega$, then the resistance of wire of length $2,m$ of the same material with area of cross section $0.2,m^2$ is
A uniformly charged cube of side one cm having surface charge density of $8.85\ \mu C\text{ cm}^{-2}$ is placed inside a hollow metal sphere. The total flux emerging out of the sphere in $\text{Nm}^{2}\text{C}^{-1}$ is ($\epsilon_{0}=8.85\times 10^{-12}\text{C}^{2}\text{N}^{-1}\text{m}^{-2}$)
The INCORRECT formula representing the energy stored in a parallel plate capacitor in usual notation is
Which one of the following motions is not simple harmonic motion?
The graph drawn between the velocity of sound in a gas and pressure of the gas at a given temperature is
In a uniform electric field E, the work done in rotating the electric dipole of dipole moment P from $-45^{\circ}$ to $45^{\circ}$ with respect to the field direction is
The distance between the centres of two identical solid spheres each of radius 5 cm kept in free space is 40 cm. If each one is holding a charge of $2,\mu C$, then the work done in bringing their centres to a separation of 30 cm is
If $f$ represents the intermolecular force between molecules and $V$ is the volume occupied by the gas molecules, then at high pressure and at low temperatures, the gas shows large deviation from the ideal behaviour because the fact that
If 300 J of heat energy is used to raise the temperature of one mole of an ideal gas by 10 K at constant pressure, then heat energy required to raise its temperature by 10 K at constant volume is $(R=8.3\text{ J mol}^{-1}\text{K}^{-1})$
The MISMATCH among the following phase transition processes is
A cylinder contains 18 moles of oxygen at pressure of 15 atmosphere at temperature 300 K. If the pressure reduces to 9 atmospheres by the withdrawal of 6 moles of oxygen, then the temperature of the cylinder will be reduced to
To increase the efficiency of a Carnot engine working between a source at 500 K and a sink at 300 K by 10%, with the same sink temperature the source temperature should be increased to
The flow of oil of density $800\text{ kgm}^{-3}$ through a horizontal pipe is streamlined. If the pressure between two points separated by 1m in the tube falls by $1.6\text{ Nm}^{-2}$, then the change in kinetic energy per kg of the liquid between these points is
If the work done in increasing the area of a thin soap film from $A$ to $3A$ is $W$, then the surface tension of the soap solution is
If the ratio of the distances of a planet from the sun at perihelion and aphelion is 2: 3, then the ratio of their respective velocities at the perihelion and aphelion is
The height at which the weight of a body becomes one third of its weight on the surface of earth is (R is the radius of earth)
The power generated by a turbine operated by the fall of water from a height of 100 m at the rate of $24\text{ kg s}^{-1}$ is 21 kW. The percentage loss in power is
A bob of mass m tied to one end of a light string of length 50 cm whirled in a vertical circle. The minimum velocity with which it has to move so that the string remains taut, when it reaches the top most point of the circle is $(g=10\text{ ms}^{-2})$
The objects and the corresponding positions of centre of mass are given below. The FALSE one is
A solid cylinder of mass 6 kg of length $l$ is inserted tightly into a hollow cylinder of outer radius 0.6 m and length $l$ without any air gap between them. If the moment of inertia of this setup about its own axis is $1.44\text{ kgm}^{2}$, then the mass of the hollow cylinder is
The mismatch between the physical quantity and the dimensional formula in the following is