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A Galilean telescope is $18\text{cm}$ long when focused to form an image at infinity. If the objective lens has a focal length of $20\text{cm}$, what is the focal length of the eyepiece?

What is a chain reaction?

What kind of image do we see while watching a movie in a cinema hall?

A physical quantity of the dimensions of length that can be formed out of $c$, $G$ and $$\frac{e^2}{4\pi {\epsilon }_0}$$ is [$c$ is the velocity of light, $G$ is the universal constant of gravitation and $e$ is the charge]

Which one has larger wavelength, red or blue light?

At distance ${}^{\prime }{r}^{\prime }$ from a point charge, the ratio $\frac{u}{v^2}$ (where ${}^{\prime }{u}^{\prime }$ is energy density and ${}^{\prime }{v}^{\prime }$ is electrostatic potential) is best represented by:

Myopia is also known as:

If the key in the arrangement is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are:

An electrical appliance having a resistance of $200\Omega$ is operated at 200 V. Calculate the energy consumed by the appliance in 5 minutes (i) in joule, (ii) in kWh.

Describe with the help of a ray-diagram, the size, nature and position of the image formed by a convex lens when an object is placed beyond 2f in front of the lens.

'X' is device which prevents damages to electrical circuits and possible fires. Identify 'X':

___is a quantity defined as the number of species in an area.

When you look at objects near your eye, then the focal length?

What is electric current fuse rating??.....explain...

If AB is the object and CD is the image formed. If AP is the object distance and CP is the image distance from the mirror. Then choose the correct sign convention?
$\begin{array}{cc}1.heightofimage=+ve& 2.heightofimage=-ve\\ 3.heightofobject=+ve& 4.heightofobject=-ve\\ 5.AP=+ve& 6.AP=-ve\\ 7.PC=+ve& 7.PC=+ve\end{array}$

An electric bulb is rated at $120W,220V$. What will be the power if it is working at $110V$ ?

A sphere of radius $R$ made of material of refractive index ${\mu }_2$ is placed in a medium of refractive index ${\mu }_1$. Find the value of $x$, such that a real image is formed at a distance $x$ from the surface as shown in the figure below.

A cylindrical bar magnet is kept along the horizontal axis of a circular coil. If the magnet is rotated about the axis, then ____

Superconductors are materials that ___.

1. 81

Two rods of length $l_1$ and $l_2$ are made of materials whose coefficient of linear expansion are ${\alpha }_1$ and ${\alpha }_2$. If difference between two lengths is independent of temperature then

Effective resistance between point $A$ and $B$ for following network is-

(each branch of resistance is $R$)

The figure shows a spherical concave mirror with its pole at $(0,0)$ and principal axis along $x-$axis. There is a point object $O$ at $(-40\text{cm},1\text{cm})$. The position of the image is

What do you understand by the term resistance?

The magnetic field vector of an electromagnetic wave is given by $B=B_0\left(\frac{\hat{i}+\hat{j}}{\sqrt{2}}\right)\cos (kz-\omega t)$, where, $\hat{i},\hat{j}$ represents unit vector along $x$ and $y-$axis respectively. At $t=0\text{s}$, two electric charges $q_1$ of $4\pi$ coulomb and $q_2$ of $2\pi$ coulomb located at $(0,0,\frac{\pi }{k})$ and $(0,0,\frac{3\pi }{k})$ respectively, have the same velocity of $0.5c\hat{i}$, (where $c$ is the velocity of light). The ratio of the force acting on charge $q_1$ to $q_2$ is

Name the device which is used to reverse the direction of current in the coil of a motor .

In one fission of uranium, $3\times {10}^{-11}J$ of energy is made available. Calculate the total number of fissions necessary per second to generate power of 15kW.

Two sounds of the same loudness and the same pitch produced by two different instruments differ. Explain and draw diagrams to illustrate your answer.