List of top Physics Questions

The position vector of a particle is $ \overrightarrow{r} = (a \, \cos \, \omega t) \widehat{i} + (a \sin \omega t) \widehat{j}$. The velocity of the particle is
In an A.C. circuit, the current flowing is \(I=5sin(100 t - \frac{π}{2}) ampere\) and the potential difference is \(V = 200 sin (100 t) volts\). The power consumption is equal to
Percentage error in the measurement of mass and speed are $2\%$ and $3\%$ respectively. The error in the estimation of kinetic energy obtained by measuring mass and speed will be
Two wires of the same metal have same length, but their cross-sections are in the ratio 3 : 1. They are joined in series. The resistance of thicker wire is $10\, \Omega.$ The total resistance of the combination will be
When the key K is pressed at time t = 0, then which of the following statement about the current I in the resistor AB of the given circuit is true?
The dimensions of $RC$ is
A heating coil is labelled 100 W, 220 V. The coil is cut in half and the two pieces are joined in parallel to the same source. The energy now liberated per second is
A $4\, \mu F$ capacitor is charged to 400 V. If its plates are joined through a resistance of $2\,k \Omega$, then heat produced in the resistance is
In the network shown in the figure, each of the resistance is equal to $2\, \Omega.$ The resistance between the points A and B is
Ten identical cells each of potential $E$ and internal resistance $r$ are connected in series to form a closed circuit. An ideal voltmeter connected across three cells, will read
A straight line conductor of length 0.4 m is moved with a speed of 7 m/s perpendicular to a magnetic field of intensity 0.9 Wb/$m^2$. The induced e.m.f. across the conductor is
Water is falling on the blades of a turbine at a rate of $6000 \,kg \,min ^{-1}$. The height of fall is $100\, m$. The power given to the turbine is
There is an electric field E in x-direction. If the work done on moving a charge of 0.2 C through a distance of 2 m along a line making an angle 60$^{\circ}$ with x-axis is 4 J, then what is the value of E?
A charge q is placed at the centre of the line joining two exactly equal positive charges The system of three charges will be in equilibrium, if q is equal to
In the circuit shown in the figure, the current through
Quality factor of LCR circuit having resistance R and inductance L at resonance frequency $ (\omega ) $ is given by:
A battery of internal resistance $4\Omega$ is connected to the network of resistances as shown in figure. In order that the maximum power can be delivered to the network, the value of R in $2\Omega$ should be
A domestic electrical appliance, working on a three pin will continue working even if the top pin is removed. The third pin is used only as a safety device.
The internal resistance of a cell of e.m.f. $2$ volts is $0.1 \Omega$. It is connected to a resistance of $3.9$ $\Omega$. The voltage across the cell will be (in volts)
Ten identical wires each having a resistance of one ohm are connected in parallel. The combination will have a resistance of
What is the equivalent resistance between A and B in the given figure
Which of the following relation is called as current density ?
What is the dielectric constant of a conductor?
A simple pendulum with a bob of mass m oscillates from A to C and back to A such B that PB is H. If the acceleration due to gravity is g, then the velocity of the bob as it passes through B is
It is possible to have a positively charged body at