George Devel invented the first digitally operated programmable robot called ____________.

In actual practice, the range of uplink frequencies used is _________ GHz.

The total variation in frequency of a FM transmitter is called _______

After the angle of refraction becomes 90^o at the ionosphere, the wave travels _________.

A p-n diode can be used as _______________.

In modulation process radio frequency wave is termed as ______________.

According to Einstein's photoelectric equation the graph between the K.E of photoelectrons ejected and the frequency of incident radiation is ____________.

A current gain for, a transistor working as CB amplifier is 0.90. If emitter current is 10 mA, then base current is ________________.

The energy of the electron in the first orbit of hydrogen atom is -13.6 eV. Its potential energy is _______________.

The blue print for making ultra durable synthetic material is mimicked from _____.

The principle based on which a solar cell operates is______.

In photoelectric emission, a radiation whose frequency is 4 times threshold frequency of a certain metal is incident on the metal. Then the maximum possible velocity of the emitted electron will be _____.

In a Young’s double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to, _____.

_________ spectra are used for making dyes

The relation between velocity of light, permeability and permittivity of free space in________.

Electromagnetic waves are __________ waves.

A galvanometer can be converted into a voltmeter by connecting _________________.

The magnitude of the induced emf in a conductor depends on the _______________.

When the free electrons are moving in all possible directions, the value of the current produced is_______

In a hollow spherical shell potential (V) changes with respect to distance (r) from centre.
\(\left[ { V }_{ inside }=\frac { Q }{ 4\pi { \varepsilon }_{ 0 }R } r\le R,\quad { V }_{ outside }=\frac { Q }{ 4\pi { \varepsilon }_{ 0 }r } r\ge R,V\alpha \frac { 1 }{ r } \right] \)

In a parallel plate capacitor of capacitance C, a metal sheet is inserted between the plates, parallel to them. The thickness of the sheet is half of the separation between the plates. The capacitance now becomes

The BH curve for a ferromagnetic material is shown in the figure. The material is placed inside a long solenoid which contains 1000 turns/cm. The current that should be passed in the solenoid to demagnetize the ferromagnet completely is _____.

During the propagation of electromagnetic waves in a medium __________________.

Four Gaussian surfaces are given below with charges inside each Gaussian surface. Rank the electric flux through each Gaussian surface in increasing order.

Two wires of A and B with circular cross section made up of the same material with equal lengths. Suppose R_A = 3 R_B, then what is the ratio of radius of wire A to that of B?