Explore topic-wise InterviewSolutions in .

The figure shows four paths along which four different objects move from a starting point to a final point, all in the same time. The grid lines are equally spaced. Rank the paths according to the average speed, the greatest first.

The length of the most effective transmitting antenna is equal to one-fourth the wavelength of the broadcast wave. If a radio station has an antenna 4.5 m long then what is the broadcast frequency of the radio station?

In the figure shown, a force of $10N$ is applied to the $2Kg$ mass at $t=0s$. All surfaces are smooth and ignore the size of body $B$. Find the time after which the body $B$ will lose contact with the plank $A$ of length $10m$.

The given graph shows a relation between the number of games won (y) by each player having a particular age (x).





The equation of the line is

The orbital angular momentum of a satellite of mass $m$ revolving at a distance $r$ from the centre is $L$. If the distance is increased to $16r$, then the new angular momentum will be (Take $M$ as mass of the Earth)

1. 0.695

A standing wave is set on a string of length $3\text{m}$ which is fixed between two points. If the number of loops formed is four, then calculate the frequency of wave. Given velocity of wave is $18{\text{ms}}^{-1}$.

The standing wave in a medium is expressed as $y=0.2\sin \left(0.8x\right)\cos \left(3000t\right)\text{m}$. The seperation between any two consecutive points of minimum and maximum displacement is

State two differences between an electromagnet and a permanent magnet.

Identify the thrust among the three different forces applied on the box as shown in the figure.

A plot between the angle of deviation and angle of incidence for a prism is shown in the figure. From the graph one can say that the refracting angle of the prism is :

When 300 J of heat is added to 25 gm of sample of a material its temperature rises from ${25}^{\circ }Cto{45}^{\circ }C.$ the thermal capacity of the sample and specific heat of the material are respectively given by

Two spherical loops of radius r and 2r , have currents I and I/2 flowing them in clockwise and anti clockwise directions respectively. If their equivalent magnetic moments are m1 and m2 respectively, find the relation between m1 and m2

It is required to punch a hole of diameter $10mm$ on a sheet of thickness $3mm$. The shear strength of the work material is $420MPa$. The required punch force is

In the figure, $m_A=2\text{kg}$ and $m_B=4\text{kg}$. The minimum value of $F$ for which $A$ starts slipping over $B$ is $(g=10{\text{ms}}^{-2})$

The ground state energy
of hydrogen atom is −13.6 eV. What are the kinetic and
potential energies of the electron in this state?

Find the value of $\theta$ in the diagram so that the projectile can hit the target.

$(\text{Take}g=10m/s^2)$

Moment of inertia of a body about a given axis is $1.5{\text{kg m}}^2.$ Initially, the body is at rest. In order to produce a rotational kinetic energy of $1200\text{J},$ the angular acceleration of $20{\text{rad s}}^{-2}$ must be applied about the axis for a duration of-

The length of a rod is $20\text{cm}$ and area of cross-section $2{\text{cm}}^2$. The Young's modulus of the material of wire is $1.4\times {10}^{11}{\text{N/m}}^2$. If the rod is compressed by a load of $5\text{kg-wt}$ along its length, then find the energy stored in the rod (in Joules).

A boat is sent across a river with a velocity of $3\text{km/h}$. If the resultant velocity of the boat is $5\text{km/h}$, then velocity of the river flow is

A particle is projected vertically upwards from $O$ with velocity $v$ and a second particle is projected at the same instant from $P$ (at a height h above $O$) with velocity $v$ at an angle of projection $\theta$. The time when the distance between them is minimum is

Tap the bubbles that give the result as 15.

The energy radiated by a black body at $2300\text{K}$ is found to have maximum intensity at wavelength $1260\text{nm}$, its emissive power being $8000{\text{W/m}}^2$. When the body is cooled to a temperature $T\text{K}$, the emissive power is found to decrease to $500{\text{W/m}}^2$. Find the wavelength at which intensity of emission is maximum at the temperature $T$.

Two coherent plane light waves of equal amplitude makes a small angle α(<<1) with each other. They fall almost normally on a screen. If $\lambda$ is the wavelength of light waves, the fringe width Δx of interference patterns of the two sets of wave on the screen is

Two bodies are held separated by $9.8\text{m}$ vertically one above the other. They are released simultaneously to fall freely under gravity. After $2\text{s}$ the relative distance between them is