List of top Physics Questions

A body of mass 5 kg makes an elastic collision with another body at rest and continues to move in the original direction after collision with a velocity equal to $ \frac{1}{10} $ th of its original velocity. Then the mass of the second body is
A solid sphere of mass $100\, kg$ and radius $10\, m$ moving in a space becomes a circular disc of radius $20\, m$ in one hour. Then the rate of change of moment of inertia in the process is
A semicircular plate of mass $m$ has radius $r$ and centre $c$. The centre of mass of the plate is at a distance $x$ from its centre $c$. Its moment of inertia about an axis passing through its centre of mass and perpendicular to its plane is
Which of the following Is a scalar quantity?
A circuit is made using $R_1, R_2, R_3, R_4$ and a battery as shown in the following figure. Find the equivalent resistance of the given circuit and the current passing through $R_3$
Position of particle located on x-axis changes with time (t) as x = 2.5t2.
Speed of the particle at t = 5 seconds is equal to?
How much work must be done by a force on 50 kg body in order to accelerate it from rest to 20 $ms^{-1}$ in 10 s
A particle moves in a circle of radius 20 cm. Its linear speed is given by v = 2t . where t is in s and v in m/s. Then
The resistance $R = \frac{V}{I}$ where $V = (100 \pm 5) V $ and $I = (10 \pm 0.2) A.$ The percentage error in R is
The Doppler effect is applicable for
Two identical particles each of mass 'm' start moving towards each other from rest from infinite separation under gravitational attraction. Their relative velocity of approach at separation 'r' is
The study of photoelectric effect is useful in understanding:
Consider a cylindrical conductor of Length L and area of cross section A. The specific conductivity varies as $\sigma (x) = \sigma_0 \frac{L}{\sqrt{x}}$ where x is the distance along the axis of the cylinder from one of its ends. The resistance of the system along the cylindrical axis is
As a result of change in the magnetic flux linked to the closed loop shown in the figure, an emf V volt is induced in the loop. The work done (joules) in taking a charge Q coulomb once along the loop is:
 
the closed loop
In a stationary wave along a string the strain is
Out of dia, para and ferromagnetism, the universal property of all substances is
The ground state energy of hydrogen atom is –13.6 eV. What are the kinetic and potential energies of the electron in this state?
lf the length of a seconds pendulum is increased by 2%, then in a day the pendulum
An $LCR$ series circuit is at resonance. Then
The ratio of hydraulic stress to the corresponding strain is known as
If $T$ is the surface tension of a liquid, the energy needed to break a liquid drop of radius $R$ into $64$ drops is
An astronaut experiences weightlessness in a space satellite. It is because
A wave of frequency $500\, Hz$ travels with a speed of $360 \,ms^{-1}$. The distance between two nearest points which are $60^{\circ}$ out of phase is
If $ {{E}_{c}}=20\,\,\sin \,{{10}^{5}}\,\pi t $ and $ {{E}_{m}}=10\sin 400\pi t $ it are carrier and modulating signals, the modulation index is
A simple harmonic motion is represented by $x(t) = \sin^2 \omega t - 2 \, \cos^2 \, \omega t$ . The angular frequency of oscillation is given by