List of top Physics Questions

Two circular loops A and B or radii $r_A$ and $ r_B$ respectively are made from a uniform wire. The ratio of their moments of inertia about axes passing through their centers and perpendicular to their planes is $\frac{I_B}{I_A}=8,\,then\,\left(\frac{r_B}{r_A}\right) $ equal to
A body of mass $m$ is tied to one end of a spring and whirled round in a horizontal plane with a constant angular velocity. The elongation in the spring is 1 cm. If the angular velocity is doubled, the elongation in the string is 5 cm. The original length of the spring is
A vector $Q$ has a magnitude of 8 is added to the vector $p$ which ties along the X-axis. The resultant of these two vectors is a third vector $R$ which lies along the Y-axis and has a magnitude twice that of $P$ The magnitude of $P$ is
Weight of a body of mass m decreases by $1%$ when it is raised to height $h$ above the earth's surface. If the body is taken to a depth $h$ in a mine, change in its weight is
A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved the new value of the magnetic field is
A ball is thrown vertically upwards. Which of the following plots represents the speed-time graph of the ball during its flight if the air resistance is not ignored?
If retardation produced by air resistance of projectile is one-tenth of acceleration due to gravity, the time to reach maximum height:
The displacement-time graph of a particle executing SHM is as shown in the figure The corresponding force-time graph of particle is
The inward and outward electric flux from a closed surface are respectively $8\times 10^3$ and $4\times 10^3$ unit. Then the net charge inside the closed surface is
A charged particle moves along the line AB which lies in the same plane of a circular loop of conducting wire as shown in the figure above. Then
If vibration of string are to be two times, then tension in the string must be made:
A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 4/3 and the fish is 12 cm below the surface of water, the radius of circle in centimetre is
When an AC source of emf $e =E_0$ sin (100t) is connected across a circuit, the phase difference between the emf e and the current i in the circuit is observed to be $ \frac{\pi}{4}$ ahead, as shown in the diagram. If the circuit consists possibly only of R-C or R-L or L-C in series, find the relationship between the two elements.
An observer moves towards a stationary source of sound with a speed \(\frac {1}{5}^{th}\) of the speed of sound. The wavelength and frequency of the source emitted are λ and f respectively. The apparent frequency and wavelength recorded by the observer are respectively:
Following diagram performs the logic function of:
logic function

Three capacitors each of capacity 4µF are to be connected in such a way that the effective capacitance of 6µF. This can be done by

Water rises in a capillary upto a extension height such that upward force of surface tension balances the force of $75 \times 10^{-4} \,N$ due to weight of water. If surface tension of water is $6 \times 10^{-2} \,N / m$. The internal circumference of the capillary must be
The displacement of the motion of a particle is represent by a equation $y=A \sin \omega t+B \cos \omega t$ The motion of particle is
Two rods,one of aluminium and the other made of steel ,having initial length $l_1 + l_2$. are connected together to form a single rod of length $l_1+l_2$. The coefficients of linear expansion for aluminium and steel are $\alpha_a$ and $\alpha_s$ respectively. if the lenght of each rod increases by the same amount when their temperature are raised by t$^{\circ}C,$then find the ratio $\frac{l_1}{l_1+l_2}$
The electrical permittivity and magnetic permeability of free space are respectively $ {{\varepsilon }_{o}} $ and $ {{\mu }_{0}} $ . The corresponding value for a medium is:

An \(AC\) supply gives 30 Vrms which is fed on a pure resistance of \(10 \,ohm\). The power dissipated:

In the shown arrangement of the experiment of the meter bridge if AC corresponding to null deflection of galvanometer is x, what would be its value if the radius of the wire AB is doubled?

In the shown arrangement of the experiment of the meter bridge if AC corresponding to null deflection of galvanometer is x, what would be its value if the radius of the wire AB is doubled?
A potentiometer has uniform potential gradient. The specific resistance of the material of the potentiometer wire is $10^{-7} $ ohm metre and the current passing through it is 0.1 ampere. Cross-section of the wire is $10^{-8}\,m^2$. The potential gradient along the potentiometer wire is
Two wires of same dimensions but resistivities $\rho_1$ and $\rho_2$ are connected in series. The equivalent resistivity of the combination is
Which of the following set-up can be used to verify Ohm's law ?