List of top Physics Questions

For a damped harmonic oscillator of mass $ 250\,g $ , the values of spring constant $ (k) $ and damping constant $ (b) $ are $ 85\, N/m $ and $ 70\,g/s $ , respectively. What is the period of motion ?

If a particle cover the displacement half of amplitude; then what fraction of the total energy of a simple harmonic oscillator is kinetic energy

Two parallel metal plates having charges $+ Q$ and $-Q$ face each other at a certain distance between them. If the plates are now dipped in kerosene oil tank, the electric field between the plates will

A non-conducting sphere of radius a has a net charge $+q$ uniformly distributed throughout its volume. A spherical conducting shell having inner and outer, radii b and c and a net charge $-q$ is concentric with the sphere (see the figure). Read the following statements (i) The electric field at a distance $r$ from the center of the sphere = $\frac{1}{4\pi \epsilon_o} \frac {qr}{a^3} for\, r < a$ (ii) The electric field at distance $r$ from the center of the sphere for $a < r < b = 0$ (iii) The electric field at distance $r$ from the center of the sphere for $b < r < c < = 0$ (iv) The charge on the inner surface of the hollow sphere = $-q$ (v) The charge on the outer surface of the hollow sphere = $+q$.

Pressure inside two soap bubbles are 1.01 atm and 1.03 atm. Ratio between their volumes is

If a conductor is given charge then no excess inner charge appears. Electric field inside conductor is zero.

Six equal capacitors each of capacitance C are connected as shown in the figure. Then the equivalent capacitance between A and B is

Two metal plate form a parallel plate capacitor. The distance between the plates is $d$. A metal sheet of thickness $d/2$ and of the same area is introduced between the plates. What is the ratio of the capacitances in the two cases?

The torque of a force$\overrightarrow{F} = 2\hat{i} - 3\hat{j} +5\hat{k}$ acting at a point whose position vector $\overrightarrow{r} = 3\hat{i} - 3\hat{j} + 5\hat{k}$about the origin is

Newton's second law of motion is

Water standing in the open at $ {{32}^{o}}C $ evaporates because of the escape of some of the surface mole cuels. The heat of vaporisation (540 cal/g) is approximately equal to $ \varepsilon $ n, where $ \varepsilon $ is the average energy of the escaping molecules and n is the number of molecules per gram. The value of $ \varepsilon $ is close to

Tonoplast is a membrane surrounding the

In an inelastic collision

One end of a horizontal thick copper wire of length $2\, L$ and radius $2 \,R$ is welded to an end of another horizontal thin copper wire of length $L$ and radius $R$. When the arrangement is stretched by applying forces at two ends, the ratio of the elongation in the thin wire to that in the thick wire is

$\lambda_1$ and $\lambda_2$ are used to illuminate the slits. $\beta_1$ and $\beta_2$ are the corresponding fringe widths. The wavelength $\lambda_1$ can produce photoelectric effect when incident on a metal. But the wavelength $\lambda_2$ cannot produce photoelectric effect. The correct relation between $\beta_1$ and $\beta_1$ is

Two satellites $A$ and $B$ go round a planet $P$ in circular orbits having radii $4R$ and $R$ respectively. If the speed of the satellite $A$ is $3\upsilon$, the speed of satellite $B$ will be

The vibrations of a string of length $60\, cm$ fixed at both the ends are represented by the equation $y=2 sin \left(\frac{4\pi x}{15}\right) cos \left(96\pi t\right)$ where $x$ and $y$ are in cm. The maximum number of loops that can be formed in it is

The value of g at a particular point is $9.8 \, ms^{-2}$. Suppose theearth suddenlyshrinks uniformly to half its present size without losing any mass. The value ofg at the same point (distance of the point from the centre of earth does not change) will now be

Particle $A$ moves along the line $ y=4\sqrt{3}\,m $ with constant velocity v of magnitude $2.0 \,m/s$ and directed parallel to the positive $x$ -axis (see figure). Particle $B$ starts at the origin with zero speed and constant accelerationa (of magnitude $ 4.0\,m/s^{2} $ ) at the same instant that the particle A passes the y axis. The angle $ \theta $ between a and the positive $y$ axis that would result in a collision between these two particles should have a value equal to

Which of the following is the best method to reduce eddy currents?

When a slow neutron is captured by a $^{235}_{92} U$ nucleus, a fission energy releasing $200\, MeV$. If power of nuclear reactor is $100\, W$ then rate of nuclear fission is

Velocity of sound waves in air is $330 \,m/s$. For a particular sound in air, a path difference of $40 \,cm$ is equivalent to phase difference of $1.6\pi$ The frequency of the wave is

Two spherical conductors $A$ and $B$ of radii $a$ and $b(b>a)$ are placed concentrically in air. The two arc connected by a copper wire as shown in figure. The equivalent capacitance of the system is

Three thin metal rods, each of mass $M$ and length $L$, are welded to form an equilateral triangle. The moment of inertia of the composite structure about an axis passing through the centre of mass of the structure and perpendicular to its plane is

There are two identical small holes on the opposite sides of a tank containing a liquid. The tank is open at the top. The difference in height between the two holes is $h$. As the liquid comes out of the two holes, the tank will experience a net horizontal force proportional to