List of top Physics Questions on The Potential Energy Of A Spring

A path length of 1m in air is equal to a path length of $x$ m in a medium of refractive index 1.5. Then the value of $x$ (in meters) is:

If the number of electron-hole pairs per cm$^3$ of an intrinsic Si wafer at temperature 300 K is $1.1 \times 10^{10}$ and the mobilities of electrons and holes at 300 K are 1500 and 500 cm$^2$ per volt, second, respectively, then the conductivity of the Si wafer at this temperature (in $\mu$mho cm$^{-1}$) is nearly:

A string of length $ L $ is fixed at both ends and vibrates in its fundamental mode. If the speed of waves on the string is $ v $, then the angular wave number of the standing wave is:

The kinetic energy of 3 moles of a diatomic gas molecules in a container at a temperature $ T $ is same as that of kinetic energy of $ n $ moles of monoatomic gas molecules in another container at the same temperature $ T $. The value of $ n $ is:

An external voltage $ V $ is supplied to a semiconductor diode having built-in potential $ V_0 $. The effective barrier height under forward bias is

The radiations used in LASIK eye surgery are:

All real gases behave like an ideal gas at:

A particle is displaced from P $ (3i + 2j - k) $ to Q $ (2i + 2j + 2k) $ by a force $ \mathbf{F} = i + j + k $. The work done on the particle (in J) is:

The angle between $ \vec{A} \times \vec{B} $ and $ \vec{B} \times \vec{A} $ is:

The equipotential surface is:

A parallel beam of light is incident from air at an angle $\alpha$ on the side PQ of a right-angled triangular prism of refractive index $\mu = \sqrt{2} \approx 1.414$. The beam of light undergoes total internal reflection in the prism at the face PR when $\alpha$ has a minimum value of 45$^{\circ}$.
The angle $\theta$ of the prism is:

The oscillating magnetic field in a plane electromagnetic wave is given by $B_y = (8 \times 10^{-6}) \sin[2 \pi \times 10^{11} t + 200 \pi x] $ tesla. Then the wavelength of the electromagnetic wave (in cm) is:

An electric appliance draws 3A current from a 200 V, 50 Hz power supply. The amplitude of the supply voltage is nearly:

The y-intercept of the graph between the terminal voltage $V$ with load resistance $R$ along $y$ and $x$ – axis, respectively, of a cell with internal resistance $r$, as shown, is:

A spherical metal shell $ A $ of radius $ R_A $ and a solid metal sphere $ B $ of radius $ R_B $ ($ R_B<R_A $) are kept far apart and each is given charge $ +Q $. If they are connected by a thin metal wire and $ Q_A $ and $ Q_B $ are the charge on $ A $ and $ B $, respectively, then:

A tuning fork vibrating at 300 Hz, initially in air, is then placed in a trough of water. The ratio of the wavelength of the sound waves produced in air to that in water is (Given that the velocity of sound in water and in air at that place are 1500 m/s and 350 m/s respectively):

Ratio between the frequencies of the third harmonics in the closed organ pipe and open organ pipe of the same length is:

According to equipartition principle, the energy contributed by each translational degree of freedom and rotational degree of freedom at a temperature T are respectively ($ k_B = \text{Boltzmann constant} $):

Two similar metallic rods of the same length $ l $ and area of cross section $ A $ are joined and maintained at temperatures $ T_1 $ and $ T_2 $ ($ T_1>T_2 $) at one of their ends as shown in the figure. If their thermal conductivities are $ K $ and $ \frac{K}{2} $ respectively. The temperature at the joining point in the steady state is:

What will be the spring constant of a spring? When it is streched 10 cm, it has potential energy of 5600 J.

A ball with $10^3J$ of kinetic.energy coflides with a.hodzontally mounted spring. If the maximum compression of the. spring is 50 cm, then the spring constatrt of the spring is

When a metal spring is elongated within its elastic limit

Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross-sectional area 3A. If the length of the first wire is increased by $\Delta l$ on applying a force F, how much force is needed to stretch the second wire by the same amount ?