Explore topic-wise InterviewSolutions in .

A proton beam passes without deviation through the region of space where there exists uniform transverse mutually perpendicular electric and magnetic field with $E=120\text{kV/m}$ and $B=50\text{mT}$. The beam strikes a ground target. Find the force imparted by the beam on the target if the beam current is equal to $0.80\text{mA}$.

A cylindrical tube, open at both ends, has a fundamental frequency $f_0$ in air.

The tube is dipped vertically into water such that half of its length is inside

water. The fundamental frequency of the air column now is

[RPET 1999; RPMT 1998, 2000; J & K CET 2000;

KCET 2002; BHU 2002; BCECE 2003]

You have but one molecule of Hydrogen $\left(H_2\right),$ meandering about in the vast emptiness of a $1c{m}^3$ closed box, at a speed of 500 m/s, bouncing off from one wall to the next. What are the rms speed and the temperature inside the box?

A thin paper cup filled with water does not catch fire when placed over a flame. This is because

A pin or a needle floats on the surface of water, the reason for this is

A stone tied to one end of string of $1m$ long is whirled in a horizontal circle with a constant speed. If the stone makes $10$ revolutions in $20s$, the magnitude of the acceleration of the stone is close to

In the circuit shown, $L=1\mu H,C=1\mu F$ and $R=1k\Omega$. They are connected in series with an a.c. source $V=V_0\sin \omega t$ as shown. Which of the following options is/are correct?

A metallic ball, dropped from a height undergoes _______________.

The sum of the measures of the angles of regular polygen is ${2160}^{\circ }$. How many sides does it have ?

Two thin converging lenses are placed on a common axis, so that the focus of the second lens coincides with the optic center of the first lens. An object is placed as shown. Find the lateral maginification of the system of lenses

Find the value of poission's ratio $\left(\mu \right)$ of a material whose bulk modulus$\left(K\right)$ value is half of its young's modulus $\left(Y\right)$ value.

Two spring mass systems have equal masses and springs of spring constants $k_1\text{and}{k}_2$. If the maximum velocities in the two systems are equal, then the ratio of amplitude of the first system to that of the second is :

Refractive index of glass with respect to water is 1.125. If the absolute refractive index of glass is 1.5, find the absolute refractive index of water.

Six particles each of mass $5\text{kg}$ are placed along the circumference of a circle of radius $3\text{m}$. What is the moment of inertia of the system about an axis passing through the centre of the circle and perpendicular to the plane of the circle?

A light beam is described by $E=800\sin \omega (t-\frac{x}{c})$. An electron is allowed to move normal to the propagation of light beam with a speed of $3\times {10}^7{\text{ms}}^{-1}$. What is the maximum magnetic force exerted on the electron ?

A rectangular loop carrying a current $i$ is situated near a long straight wire such that the wire is parallel to one of the sides of the loop and is in the plane of the loop. If a steady current $I$ is established in the wire as shown in the figure the loop will

Find the acceleration of block $A$ if block $C$ is moving with acceleration $a=3{\text{m/s}}^2$ as shown in the figure. Assume the surface to be frictionless and pulleys and string ideal. Take $g=10m/s^2$

Two blocks of unequal masses are tied by a spring. The blocks are pulled stretching the spring slightly and the system is released on a frictionless horizontal platform. Are the forces due to the spring on the two blocks equal and opposite? If yes, is it an example of Newton's third law?

The velocity of Electromagnetic wave is parallel to

In a hydrogen atom, an electron is making 6.6 times 10 power15 rps around the nucleus in an orbit of radius0.53 Angstroms. The equivalent dipole moment is

Mobility of electrons in a semiconductor is defined as the ratio of their drift velocity to the applied electric field. If, for an $n-\text{type}$ semiconductor, the density of electrons is ${10}^{19}{\text{m}}^{-3}$ and their mobility is $1.6{\text{m}}^2{\text{V}}^{-1}{\text{s}}^{-1}$ then the resistivity of the semiconductor (since it is an $n-\text{type}$ semiconductor contribution of holes is ignored) is close to:

When a body is thrown with a velocity u making an angle $\theta$ with the horizontal plane, the maximum distance covered by it in horizontal direction is

In an experiment with potentiometer , to measure the internal resistance of a cell. When it is shunted by $5\Omega$ the null point obtained is at $2\text{m}$ from one end. When cell is shunted by $20\Omega$, the null point is obtained at $3\text{m}$ from the same end. The internal resistance of cell is

The angle of incidence for an equilateral prism is ${60}^{\circ }$. What should be the refractive index of prism so that the ray is parallel to the base inside the prism?

A car moving with a speed of $40\text{km/h}$ can be stopped by applying brakes after at least $2\text{m}$. If the same car is moving with a speed of $80\text{km/h}$, what is the minimum stopping distance

Find the torque of a force $\overrightarrow{F}=-3\hat{i}+\hat{j}+5\hat{k}$ acting at the point $\overrightarrow{r}=-7\hat{i}+3\hat{j}+\hat{k}$

In the figure shown, a thin light inextensible string is wrapped aroung a uniform disc. One end of the string is fixed to the ceiling of the lift and the other end is fixed to the circumference of the disc. Acceleration ${}^{\prime }{a}^{\prime }$ of the lift is such that the centre of the disc does not move with respect to the ground. Find the value of $\frac{a}{g}$. (Assume the string does not slip on the pulley)