List of top Physics Questions

In the following figure is shown a system of four capacitors connected across a $10\, V$ battery. Charge that will flow from switch $S$ when it is closed is
A proton (mass m) accelerated by a potential difference $V$ flies through a uniform transverse magnetic field $B$. The field occupies a region of space by width $d$. If $\alpha$ be the angle of deviation of proton from initial direction of motion (see figure), the value of $\sin \,\alpha$ will be :
Two coaxial solenoids of different radii carry current $I$ in the same direction. Let $\vec{F}_1$ be the magnetic force on the inner solenoid due to the outer one and $\vec{F}_2$ be the magnetic force on the outer solenoid due to the inner one. Then,
When current in a coil changes from $5 \,A$ to $2 \,A$ in $0.1\, s$, an average voltage of $50\, V$ is produced. The self - inductance of the coil is :
A train is moving on a straight track with speed $20\, ms^{-1}.$ It is blowing its whistle at the frequency of $1000\, Hz$. The percentage change in the frequency heard by a person standing near the track as the train passes him is close to (speed of sound $= 320\,ms^{-1}$)
The rate of volume occupied by an atom to the volume of the nucleus is
When sunlight is scattered by atmospheric atoms and molecules the amount of scattering of light of wavelength 880 nm is \( A \). Then, the amount of scattering of light of wavelength 330 nm is approximately
Two light rays having the same wavelength in vacuum are in phase initially. Then, the first ray travels a path \( L_1 \) through a medium of refractive index \( \mu_1 \), while the second ray travels a path \( L_2 \) through a medium of refractive index \( \mu_2 \). The two waves are then combined to observe interference. The phase difference between the two waves is
Two convex lenses of power 2D and 5D are separated by a distance \( \frac{1}{3} \, \text{m} \). The power of optical system formed is
An electromagnetic wave propagating along north lies its electric field vertically upward. The magnetic field vector points towards
Pick out the wrong statement.
Two polaroids are kept crossed to each other. If one of them is rotated an angle 60°, the percentage of incident light now transmitted through the system is
A ray of light is incident on a plane mirror at an angle of 30°. At what angle with the horizontal must a plane mirror be placed so that the reflected ray becomes vertically upwards?
The value of inductance \( L \) for which the current is maximum in series \( LCR \) circuit with \( C = 10 \, \mu F \) and \( R = 1000 \, \Omega \) is
The current graph for resonance in an \( LC \) circuit is
An induced emf has
A coil of area 5 cm² having 20 turns is placed in a uniform magnetic field of \( 10^3 \, \text{gauss} \). The normal to the plane of coil makes an angle 30° with the magnetic field. The flux through the coil is
A compound microscope having magnifying power 35 with its eye-piece of focal length 10 cm. Assume that the final image is at least distance of distinct vision then the magnification produced by the objective is
The refractive index for a prism is given as \( \mu = \cot \frac{A}{2} \). Then, angle of minimum deviation in terms of angle of prism is
Which of the following statement related to hysteresis loop is incorrect?
A galvanometer with a scale divided into 100 equal divisions has a current sensitivity of 10 divisions per milliampere and a voltage sensitivity of 2 divisions per millivolt. The galvanometer resistance will be
A horizontal rod of mass 0.01 kg and length 10 cm is placed on a frictionless plane inclined at an angle 60° with the horizontal and with the length of the rod parallel to the edge of the inclined plane. A uniform magnetic field is applied ‘Vertically downwards’. The current through the rod is 1.7 A, then the value of magnetic field induction \( B \) for which the rod remains stationary in the inclined plane is
A current of 2 A is flowing in the sides of an equilateral triangle of side 9 cm. The magnetic field at the centroid of the triangle is
The direction of magnetic field \( dB \) due to current element \( dl \) at a distance \( r \) is the direction of
The earth is considered as a short magnet with its centre coinciding with the geometric centre of earth. The angle of dip \( \delta \) related to the magnetic latitude \( \lambda \) is