List of top Physics Questions

The length of a solenoid is 0.1m and its diameter is very small. A wire is wound over in two layers. The number of turns in the inner layer is 50 and that on the outer layer is 40. The strength of current flowing in two layers in the same direction is 3 ampere. The magnetic induction in the middle of the solenoid will be
The length of a wire required to manufacture a solenoid of length l and self-induction L is (cross-sectional area is negligible)
The length of a seconds pendulum is
The length of a magnet is large compared to its width and breadth. The time period of its oscillation in a vibration magnetometer is 2 s. The magnet is cut along its length into three equal parts and three parts are then placed on each other with their like poles together. The time period of this combination will be
The length of a microscope is 14 cm and for relaxed eye the magnifying power is 25. The focal length of the eye piece is 5 cm. What is the distance of the object from the objective ?
The length of a conductor is halved. Its conductivity will be
The least value for the common base transistor amplifier is in the case of
The least random state of $H_2O$ system is
The knee voltage of a p-n junction diode is 0.8 V and the with of the depletion layer is 2 $\mu m$, the electric field in the depletion layer is
The kinetic energy of a particle executing SHM is maximum, when its displacement is equal to
The interference differs from diffraction in that:
The interference finges formed by a thin oil film on water, when seen in the yellow light of sodium lamp will be :
The interference phenomenon can take place
The intensity of a wave is defined as the energy transmitted per unit area per second. Which of the following represents the dimensional formula for the intensity of the wave?
The inner and outer radius of a toroid core are $28 \,cm$ and $29\, cm$ respectively and around the core $3700$ turns of a wire are wounded. If the current in the wire is $10\, A$, then the magnetic field inside the core of the toroid is
The inductance L of a solenoid of length l , whose windings are. made of material of density D and resistivity $\rho$ is (the winding resistance is R)
The induced emf in a coil is independent of
The induced emf in a coil rotating in a magnetic field is maximum when the angle between the plane of the coil and the direction of field is :
The incorrect statement for saturation current in a photoelectric cell is
The image of an object formed on the retina of the eye is
The hysteresis cycle for the material of a permanent magnet is
The half life of a radioactive substance is $30$ days. What is the time taken to disintegrate to $3/4^{th}$ of its original mass?
The greatest and least resultant of two forces acting at a point are 29 Kg wt. and 5, Kg wt. respectively. If each force is increased by 3 Kg w t the magnitude of the resultant of hew forces acting at right angles to each other is.
The graph for photoelectric effect, which is a straight line will be between
The force per unit charge is known as