Explore topic-wise InterviewSolutions in .

A swimmer can swim with a speed $v$ in still water.





If the speed of the river flow is $u$ and the time taken by swimmer to reach opposite point on other bank of the river is $T_1$ and the time taken to travel an equal distance upstream (against the water current) in the river is $T_2$, then ratio $\frac{T_2}{T_1}$ will have a value

The potential energy function for the force between two atoms in a diatomic molecule is approximately given by $U\left(x\right)=\frac{a}{x^{12}}-\frac{b}{x^6}$, where $a$ and $b$ are constants and $x$ is the distance between the atoms. If the dissociation energy of the molecule is $D=[U_{x=\infty }-U_{\text{at equilibrium}}]$, $D$ is

If the overbridge is concave instead of being convex, the thrust on the road at the lowest position will be

Who proposed wave theory of light?

The de-Broglie wavelength $\lambda$

Three particles of masses $2\text{kg},3\text{kg}$ & $4\text{kg}$ are placed at the three vertices of a right angled triangle with sides $3\text{cm},4\text{cm}$ & $5\text{cm}$ as shown in the figure. What will be the coordinates of centre of mass of the system of particles ?

Two metal plates have potential difference of 300V are 0.01m apart. Then the electric field between the plates is

If f(x) $=2x^2,$find $\frac{f\left(3.8\right)-f\left(4\right)}{3.8-4}$

1 kg of ice at $0^{\circ }C$ is mixed with 1 kg of steam at ${100}^{\circ }C$. What will be the composition of the system when thermal equilibrium is reached? Latent heat of fusion of ice = $3.36\times {10}^{5}Jk{g}^{-1}$ and latent heat of vaporization of water = $2.26\times {10}^{6}Jk{g}^{-1}$

Force on a square loop due to an infinite current carrying wire

Which chapters of physics of class 12th should be covered in class 11th so that 12th std will be little easy. Plz give a detailed explanation

A drop of liquid of diameter 2.8 mm breaks up into 125 identical drops.

The change in energy is nearly (S.T. of liquid =75 dynes/cm)

A small ring is attached to the vertical ring as shown in figure. The small ring is given velocity $v_B=\sqrt{4gl}$ by a sharp hit, where $l$ is radius of the vertical ring. Find the normal force acting on the small ring at the topmost point, if the mass of the small ring is $m$ and mass of the vertical ring is $M$.

A block of weight $5N$ is pushed against a vertical wall by a force $12N$. The coefficient of friction between the wall and block is 0.6. The magnitude of the force exerted by the wall on the block is

Speed of sound in air is $332\text{m/s}$ at NTP. What will be the speed of sound in hydrogen at NTP if the density of hydrogen at NTP is $\left(1/16\right)$ that of air?

A rod of length $L$ is placed along the $\text{x-axis}$ between $x=0$ and $x=L$. The linear mass density $\left(\text{mass/length}\right)$ $\rho$ of the rod varies with the distance $x$ from the origin as $\rho =a+bx$. Here, $a$ and $b$ are constants. Find the position of centre of mass of this rod.

The radius for the second excited state for the $H{e}^{+}$ ion is (in $A^{\circ }$):

Escape velocity is:

A solid element exists in simple cubic crystal. If its atomic radius is $1.0\stackrel{o}{A}$ and the ratio of packing fraction to density is $0.1c{m}^3/g,$ then the atomic mass of the element is $(N_A\approx 6\times {10}^{23})$

A student wants to find the absolute pressure of water at a point below the surface of water. He has a barometer and a manometer pressure gauge. The barometer reads $1.3152\text{bar}$ whereas the manometer pressure gauge reads $0.3152\text{bar}$. What is the absolute pressure? (Assume that pressure at one end of the manometer is atmospheric.)

Find the moment of inertia $I$ of hollow sphere of outer radius $R=20\text{cm}$ and mass $M=1\text{kg}$ about its tangent on outer surface.

In a $p-n$ junction, a potential barrier of $250\text{meV}$ exists across the junction. A hole with a kinetic energy of $300\text{meV}$ approaches the junction. Find the kinetic energy $\left(\text{in meV}\right)$ of the hole when it crosses the junction if the hole approached the junction from the $p-$side.

If the electric field intensity in a fair weather atmosphere is 100V/m, then the total charge on the earth surface is

In a screw gauge, the main scale division is $1\text{mm}$ and there are $100$ divisions on circular scale. The least count of screw gauge is (Pitch $=1\text{mm}$)

The energy of electron in first excited state of hydrogen atom is $-3.4\text{eV}$, its kinetic energy is,

The position of a particle moving along x-axis is given by $x=(5t^2-4t+20)\text{m}$, where $t$ is in second. Find the magnitude average velocity between $1\text{s}$ and $3\text{s}$.

The spectral emissive power $E_{\lambda }$ for a black body at temperature $T_1$ is plotted against the wavelength and area under the curve is found to be $A$. At a different temperature $T_2$, the area is found to be $9A$. Than ${\lambda }_1/{\lambda }_2$